Science topics: Mining EngineeringLeaching
Science topic
Leaching - Science topic
Leaching is the process of extracting minerals from a solid by dissolving them in a liquid.
Questions related to Leaching
Hi.
I have leaching solution with Ca ion. When I use NaOH, Ca(OH)2 is precipitated. Is there any way to make pH 1 to 7 without precipitate?
Thanks for read.
I got leached solution of rare earth metals (La, Ce, Sm, Nd, Pr) and other metals with calcium chloride in the leached solution after dissolution of Phosphogypsum. I want to selectively recover all the rare earth metals from its solution in high purity economically. Please suggest me a best method to recover it.
Hi,
I have a leach solution with Li present as LiOH. I did lime water leaching of material but also leached impurities such as Zn, Cr and Al with it. The pH of the solution is around 11. Now I want to remove the impurities and the literature suggests using ion exchange resins to remove them. The ion exchange resins would require pH adjustment to around 6-7 which might also alter the chemistry of dissolved LiOH, and I do not want that. So how should I proceed? Is there any other way I should explore to remove those impurities?
What is the method of measuring sulfur for minerals such as metal oxide or molybdenum oxide through Leco furnace (or similar furnaces) at different temperatures, times and weights after leaching and after cleaning by titration method (gravimetry)?
I want to know the sample preparation techniques for the leaching study.
I'm trying to stain areas of dystrophic calcification in sections of FFPE perinatal brain tissue. Typical basophilic appearance on H&E but nothing with Alizarin Red (costochondral junction positive control works well). Tissue has been fixed in formalin with added glacial acetic acid. Is this likely to leach out the calcium resulting in a negative Alizarin Red, even though the material remains basophilic? I'm waiting for the von Kossa stain...and if the calcium IS leached out.. what's the basophilic material??
Thanks
Hello. I conducted batch leaching tests with samples of construction and demolition waste with adhered paints to assess the influence of the paint on the release of contaminants in the leachate. I observed that in all samples with water-based enamel paints, the pH of the leachate was significantly lower compared to the samples painted with acrylic paints. What could explain this decrease in pH?
Unlike geopolymer cement, the AAM cement produced with sodium silicate/hydroxide will leach out the alkali Na+. Based on Davidovits' explanation, geopolymer cement will not leach out the sodium because Na+ was trapped inside the chain (the attached picture represents the K+ trapped inside the chain, the same thing with Na+).
Suppose the efflorescence can be tackled and no sodium leached. Can we classify the AAM cement was having a 3D structural model chemical that traps the Na+ or K+ and becomes the geopolymer cement?
A lot of scientific papers state that BPA can "leach" from polycarbonate plastics, but what does that actually mean?
In the pore water of a long-cultivated paddy soil with high CEC (smectitic clay dominance), high organic matter and a clay pan (physical constraint) below 15 cm depth, can the total anion equivalent be greater than the total cation equivalent? The soil has been fertilized with KCl (twice a year) and ZnSO4.7H2O (once every two years) for the last 33 years.
The dominant ions in the pore water of the given soil are Chloride>bicarbonate>sulphate>calcium>magnesium>other cations
and
the total anion equivalent>>total cation equivalent.
I am hypothesising that:
1. The clay pan is inhibiting the easily migrating chloride and sulphate ions from getting leached out of the surface soil.
2. The high CEC is causing negative adsorption of anions and, at the same time, keeping the cations from going to the soil solution to maintain charge balance.
Do my hypotheses make sense? Is there any study to substantiate my findings?
I have followed a procedure to find out WHC of some sieved soil. I have also got the moisture % content of the soil. From this I have calculations that tell me exactly how much water to add to reach 60% WHC. However, after added this amount of water I can see the water leaching through the mesh bottom, suggesting that its beyond 60%
My question is, should 60% WHC happen instantly, or should I wait a certain period of time for the water to be absorbed?
As I need to weigh the wetted soil and maintain that weight. However, columns initially wetted weight more than the next day so I'm not sure which is the true WHC.
Imagine you have a field with excessive salt buildup. Assume the volumetric water content is 0.35 cm3 cm-3 and the root zone is 120 cm deep.
If the soil in the field is a clay loam soil with Ks= 5.5 cm per day, b = 5.2, and saturated water content (Theta)=0.5 cm3 cm-3, the hydraulic conductivity followed Campbell’s model, and the flow was under unit gradient conditions (i.e. negligible matric potential gradient), then how long would it take to leach out the salts?
Adding lime in the process, apart from the formation of calcium sulfate compound in the neutralization stage with sulfuric acid,if have the negative effect on the precipitation process of metals from the leach solution?
We have leached ashes of some plant samples to determine the Ni concentration in the leachate using sulfuric acid. In our method, we have used two concentrations of sulfuric acid (1M and 5M) and three pulp densities (10g/L, 100 g/L and 200 g/L). However, I observed a white precipitate in the filtered samples of the with leachate 5M sulfuric acid, after few days. I tried adding few drops of conc. HCl to dissolve it, but it did not disappear.
What could have caused the formation of this precipitate? Is there any method to prevent it?
I really appreciate your valuable suggestions to improve this.
Thank you
If we have a leaching solution containing a mixture of heavy metals in a wide range of concentrations (for example, we have some heavy metals in solution in 10 - 100 mg/L concentration range while some others are in 100 - 1000 mg/L concentration range) what would be the best ICP standard concentration range to prepare for ICP-OES analysis of this solution?
Thanks in advance for sharing your experience.
the treatment carried out on ilmenite (from industry) where apart from the Fe2TiO3 content there is a lot of FeO content as an impurity material, what must be done to the ilmenite to separate it from the impurities before roasting and leaching so as not to interfere with the roasting and leaching process?
Hello everyone,
I am conducting an isotherm/kinetics experiment to measure the capacity of a concrete filter/pervious concrete (a filter made of concrete) to remove heavy metals.
My question is, how can I measure how the percentage of the heavy metals removed is due to chemical precipitation and how much is due to the adsorption of heavy metals to the concrete filter?
Please take a look at the picture attached to see the concrete filter.
Please consider the following conditions:
The filter leaches Ca and carbonate, so precipitation happens.
The pH is constant at 12, and I cannot change it.
The adsorbent is in a filter stape as attached and is not in powder form. So, a part of precipitated heavy metal ions are trapped inside of the filter.
The picture has been extracted from Holmes et al. 2017 (Enhancing the Ability of Pervious Concrete to Remove Heavy Metals from Stormwater).
I did a leaching experiment to recover Lithium and Cobalt from wasted LIBs.
I need help in two parts I do not know what to do next.
(Element composition test) I dissolved 10 grams of my raw material (LiCoO2) in 200 ml aqua regia, then I dilluted it 1/100 in a volumetric flask. All this to find the element composition of my raw material (LiCoO2).
(Sample 1) I leached 1 gram of LiCoO2 in a mixtured of 3 grams acetic acid, 0.7 grams ascorbic acid, and 100 ml DI water. Then I dilluted the leachate solution in 1/100 volumetric flask.
Both solution I ran them in ICP-MS, I got the results but I do not know which data to use to calculate the element composition, and the leaching efficiency % of Li and Co of my sample 1.
Please I need all the possible help!
Can somebody explain to me how to calculate these things, and which value I need to use from the ICP-MS data.
Thank you!!
I see a number of researchers investigate the bioleaching of WEEE and EV batteries usually citing it as an environmentally friendly option. What are the real advantages of bioleaching of WEEE? With ore, there are low-grade ores and crushed ore can be leached in heaps or dumps. As far as I know there are no classifications of low-grade WEEE. All studies that I have seen conduct experiments on powdered WEEE and of course the black mass from EV batteries is fine, hence heaps or dumps cannot be used. A number of those studies use, in my opinion, operational parameters that are not feasible such as S/L ratios of 1%, and extraction times of 6-40 days. If the material is not low grade or processed in heaps, the opex cannot be offset. Although current processes for EV batteries use acids like HCl and H2SO4, are there not methods to regenerate and re-use those acids hence reducing the environmental foot print?
Curious to read your thoughts.
Describe the potential co-benefits and drawbacks of biochar application in agriculture, such as improved soil fertility, reduced nutrient leaching, and alterations in crop yields, using evidence from field research.
I purified my protein of interest using Ni-NTA chromatography. The protein was eluted but it eluted with a yellowish brown color which I have experienced before. I believe it was due to excess DTT (buffer mismatch) which led to leaching of Ni with my eluted protein.
Any ideas as to how to remedy this and remove the color (and Ni) without compromising the integrity of the protein.
Thank you.
We can use EDX to measure the silver concentration before and after leaching test to know amount of silver leached. However, the concentration of leached silver from membrane is measured using ug/L or mg/L with the aid of ICP-MS. How to measure the silver concentration before leaching test of membrane using ug/L or mg/L unit?
I did digestion of fly ash by HCl. Is it possible to evaporate HCl from filtrate? We don't have facility for evaporation of HCl by oven. Is there any chemical method?
Increased costs as well as increased awareness of the impact of fertilizer leaching on the environment have increased interest in use of controlled release fertilizer to increase the nutrient uptake efficiency and reduced the nutrient leaching potential. The application cost of fertilizer also reduced considerably.
I am doing some leaching experiments now on metal-bearing wastes using citric acid as lixiviant. The metals of interest are REE, Co, Mo and V. Is there any specific method for each of them to be precipitated from organic (citrate) PLS? Or are the standard methods (e.g. precipitation of V using ammonia solutions) suitable for organic PLS?
I am trying to see if my water filtration membrane is leaching during filtration
Three Central Northwest Coast wet sites have begun to highlight the significance of berries and nuts, particularly salal and acorns, to ancient subsistence practices (Figure 1). At the Ozette site (45CA24), located on the Olympic Peninsula of Washington, mudslide-encased houses and middens dating to 300-450 years ago produced flotation samples of 250,000 seeds of Salal (Gaultheria shallon; and/or its close look-alikes of genus Vaccinium). At the Sunken Village site (35MU4), located on Sauvie Island, Oregon, over 100 hemlock-lined acorn leaching pits dated to 150-700 years ago have been recorded. It is estimated that these leaching pits may represent processing of 2,500,000 acorns (Quercus garryana) in a season. Finally, at the QwuɁgwǝs site (45TN240), located at Mud Bay on Eld Inlet, Olympia, Washington, reanalysis of macrobotanical artifacts lead to the recognition that acorns were also abundant in the wet site midden. Acorn remains were seven times more common than hazelnut (Corylus cornuta) remains here, indicating that acorns might have been the most ubiquitous plant food at this south Salish Sea site. In this article it's argued that salal and acorn ecofacts from the Central Northwest Coast represent substantial ancient resources in the diets of this region.
I want to prepare quantum dot material and add it to a hydrogel, has anyone faced the leaching problem or studied it?
Can a particular type of stainless steel be recommended that will not leach magnesium?
I have some flyash and want to leach out Al2O3 and SiO2 using NaOH. IS there any additive which can help me to improve rate of leaching or dissolution .
Does this soil will suffer from potassium deficiency soon or it will still be rich in K for much longer? It's clay soil so will the K be leached into the soil because it's high in the solution.
Should we recommend further k application even if it will be small amount or should not.
Subject suggestion PhD Thesis
In the field of extracting new and updated manganese dioxide nanoparticles
Innovation in the leaching stage
instantaneous
Greetings,
I am an undergraduate BS chemistry student who is working on a slow-release nano fertilizer, how should I treat my leached samples for each time interval; that is do I employ the Kjeldahl method for each leached sample?
Thank you
Rock in chemical solution will appear chemical damage, this damage is a kind of water-rock interaction, so we can expect rock mechanical properties cracking, what else can we pay attention to?
we have an aerated heap with sensing temperature. Shockingly, the part with aeration pipes records very lower temperatures (21-34 C) in comparison with the parts with no aeration pipes (56 C).
What are the probable reasons from operational and scientific viewpoints?
Hello All,
I am currently working on the research topic, "Metals recovery from Jarosite and Jarofix". The study will entail performing experiments using the acid and water leaching approach for the recovery of metals. I intend to focus on just Zn and Cu. I have reviewed some literature however I have not found a clear algorithm for the process and necessary parameters like temperature etc to be used in the process. I would appreciate if anyone with insight on this could explain it to me or render any form of help.
Thank you.
knowing that the acid concentration and the temperature are optimal.
Increasing the reaction temperature from ambient to 80°C increased the leaching yield
After IMAC1, the protein in the elution has some Ni leached out from the Ni column. The elution fraction seem to be brown in colour.
I need to know the complete calculation how much mol percentage of palladium is left after recycling my catalyst do that I can understand how much metal has leached from the prepared catslyst
Jadeite itself is an anhydrous mineral. However, the secondary action it undergoes, the leaching of limonite will change the appearance of jadeite, can the infrared spectrum be used to indicate its water content? If so, which wavelength data can be used to characterize it?
Thanks for your answers
Gender representation in numerous school textbooks across diverse societies has been studied and discussed since the 1970s. A substantial number of these studies stated that gender bias in textbooks (GBIT) is quite stubborn and practically a barrier in the way of gender inequality (Ullah & Haque, 2016). In particular, in textbooks of Social Studies, the construction of gender is solely stereotypical (Jabeen, Choudry, Omar, 2014). Hameed (2012) in his study on gendered based English textbooks found that in shaping up ideas of the children and for encouraging optimist gender roles in children, textbooks play a decisive role and can be a valuable tool. Further, Jabeen and Illyas (2012) emphasize that characters in (learning resources (textbooks) play a significant part in children. Characters influence children's choices concerning to what type of being they want to become (Jabeen & Illyas, 2012).
Unterhalter and North (2010) therefore argue that to achieve gender equality through education, the concerns of men and women would be considered as integral parts monitoring, designing, evaluating policies programs in all social, political, and socio-economical domains to provide equal benefit for men and women and to not perpetuate inequality. Emphasizing on efficiency approach of Gender and Development (GAD), Cornwall (2000) also mentioned that men as oppressors and women as a victim of gender inequalities is a simplification of reality. So, there is a need to view gender, not as a unilateral issue of women but it should also be considered in terms of power relations and powerlessness where men and women may be dis-empowered and vulnerable (as cited in Gender analysis framework of Leach, 2003, pp.10-11).
A student is installing a field trial that we expect to largely impact soil moisture and temperature, and we simultaneously want to measure the secondary impacts on N-mineralization in the field. What are the best methods for doing this. I've seen methods of installing closed bags of soil, but that will only react to temperature, not the soil moisture. We could measure total and inorganic N at the start and after the experiment, but there could potentially be differences in leaching losses that are not accounted for. Suggestions would be most welcome!
Hi, I found that when I use MgO or Mg(OH)2 for catalysis in water, the leaching of Mg is serve. Is there any method to suppress the Mg leaching, like change the reaction solvent etc? Thank you!
Many research has been done on the use of Chitosan as an adsorbent material. When I was studying the material, I noticed that it was leaching organics when I did a leaching test. Are there any recommendations to prevent organic leaching from chitosan beads?
I am observing a high UV260 absorbance plateau during the cleaning in place of my HIC column using 1 M NaOH. This is giving me confounding results in regards to mass balance. The HIC column uses a butyl ligand. Could this suggest that the integrity of the ligand is poor or could it be leaching out because of the high concentration of NaOH? The UV260 peak appears with or without loading sample.
I run a model on an aquifer with 3 layers. the contaminant is leaching on the upper layer. At the point of entry, the contaminant concentration is constant at 0.1 mg/m³.
I am having a hard time selecting the appropriate option in Sink/Source Concentration under MT3DMS/SEAWAT model as the options available are Constant head cells, well, river, and time-variant specified concentration.
Also, no recharge is applied to this model.
In soils normally the erosion losses of soil phosphate -P are considerable and they are monitored.The leaching losses are presumed to be negligible. Under what soil crop conditions the leaching losses of phosphate are considerable and need monitoring?
I have done hot filtration test for the catalyst to show leaching and I found no reaction after filtration. So, is it still necessary to perform ICP analysis of the catalyst??
According to the available references, PbCO3 and PbO are easily soluble in HBF4 and it is sometimes mentioned that adding H2O2 will improve the efficiency of the leaching by preventing the production of PbO2.
In my experiments, a white substance forms as soon as PbO or PbCO3 is added to HBF4 and dissolution does not occur at all. I also have done some 24 hours tests and even the temperature raised to 80 ° C in these tests, but no progress is observed in the process of leaching of this materials.
It would be really appreciated if anyone can help me through this leaching process of PbO or PbCO3 in HBF4!
Hello,
I have a question about the interaction of the glass surface (soda-lime glass) with moisture and white paper. I would like to find some sources of information (articles, publications, studies, etc.). I have not yet found anything specific in the available libraries.
I have found experimentally that when wrapping glass in white paper (to store it), there is a problem with leaching of ions from the glass. This changes the adhesion properties of the glass.
I know that white paper is not generally recommended for packing and storing glass. Bleached paper reacts with Na ions from the glass. The low concentration of sodium ions on the glass surface results in further leaching of ions from the glass to the surface. And also deacidified paper has a so-called alkaline reserve. Glass is less resistant to alkaline environments, especially in connection with humidity.
I would like to know more. Please do you have experience with this phenomenon? Alternatively, can you send me links to publications that deal with this?
Thank you.
Good day, dear colleagues!
One of the critical point in the glass industry is a glass surface leaching.
Many factors may lead to this problem. Some of them is critical visible on the surface even vefore heat treatment (bending, tempering etc).
But I wanna talk about nonvisible (via human eyes) leaching.
Can You advice any method without destroing glass for identeficate glass surface nonvisible leaching?

What are the most effective and sustainable measures to prevent leaching from glass (precursor)-based geopolymer? Please recommend your suggestions and publications. Thanks.
I am doing an experiment to leach polonium-210 from my plant samples. I am having trouble getting decent recoveries. I am not able to use any heating methods because of the volatility of polonium. Does anyone have any recommendations to improve my leaching procedures? currently I am soaking the grinded plant samples overnight in HCl in a shaker.
I was going though this paper "Extraction of vanadium from high calcium vanadium slag using direct roasting and soda leaching" but finally how could they extract from the leached solution I didn;t get.
I'm working on a manganese processing project. Unfortunately, in the manganese ore high amounts of divalent iron are present and it remain in solution after acidic leaching and increasing pH to 5.
Chemicals added to swimming pools leach into the air above the surface of the water, with the result that regular lap swimmers must be inhaling them to a significantly greater degree than casual pool users. Have there been any studies on the long term health effects?
The EDS analysis reported the decreasing amount of Nickel on catalyst surface after hydrogenation reaction. I thought there is leaching of Nickel during reaction and easier than leaching copper. But why and what is the properties of Nickel that can explain this result, the leaching of Nickel on catalyst.
I am using a Ni, Co, Ru activated carbon catalyst (simple impregnation method) for hydrogenation. But I am facing the metal leaching problem during recyclability. Please suggest to me some synthesis modifications, which will be beneficial to stop metal leaching and will not affect catalyst activity.
I need to prepare yttrium nitrate by dissolving its oxide into 6M nitric acid.
I would like to know any experimental considerations in this process to get best results.
- I have a very complex XRD spectrum (fly ash leaching residue) and couldn't match all the peaks with JADE. Do you know any free or paid software which may has strong database and can do search and match of complexes? In JADE you have to guess which is inside your sample and then compare with your peaks but when you are not sure about the formed minerals, this method is not helpful. Thank you!
A daily leaching column Nitrogen was conducted to investigate the rate of soil leaching. Now I search for a simple model of equation to represent scientifically the results.
Leaching of heavy metal can be a concern as heavy metal contaminated sludge is introduced to the finished products. It should be confirmed that leaching of heavy metal from bricks does not exceed the maximum permissible limit even under extreme conditions. The leaching efficiency was defined as the ratios of concentration of the heavy metal in the original sample and leachate of the sample
I'm planning the calcium leaching experiment. Thereby, the cement paste specimens were immersed in the 6M ammonium nitrate(NH4NO3) solution. If the specimens were removed at a specific immersion age, what method should be used to maintain the condition at that time? (For example, can it be maintained when the specimens were immersed in acetone and then dried?)
Hello everyone, my research is about leaching of gold from end-of-life printed circuit board by using Fe2(SO4)3 solution and the leachability was approximately 30-40%. Hence, i have some questions to ask.
1. Could these reactions be spontaneous in my solution?
Au + Fe3+ --> Au+ + Fe2+
2Au + SO42- + 2Fe3+ --> Au2SO4 + 2Fe2+
2. If not, in your opinion, what reactions might occur in my solution for gold leaching?
Hello everyone. My research is about kaolin bioleaching which reduced Fe3+ to Fe2+. I am required to filter out leaching solutions so I can dry the kaolin to powder form for ICPOES analysis to detect Fe3+ ions.
Since the leaching solution contains glucose, bacteria cells and reduced Fe2+ ions, may I know is cellulose nitrate or cellulose acetate membrane can be used for this filtration?
We are trying to add nanoparticle power waste material in sustainable concrete, so we want to see any leaching effect of this material. Need suggestions and discussion from experts.
The commercial graphite is purchased from the market. And the recycled graphite is simply and mechanically recycled from the copper foil of a spent lithium-ion battery. There is no leaching or any other purity removal process on it. Does anyone could help to analyze these two spectra?

We want to couple proteins to Fe3O4 particles via their primary amine or SH groups. We can generate large amounts of these particles. We are currently trying coupling via epoxide group in which particles have been coated with a silane compound but are not having much luck. The coupling needs to be covalent and resistant to pH 3-13 so that there is low leaching of proteins. Please let me know if you can provide this expertise.
In zinc production plant, in leaching step, there are 20 g/l zinc and 0.6 g/l chloride. Is there any practical approach to remove chloride to less than 300 mg/l?
Regards
I had prepared 50ml of 0.5M Sulphuric acid and to that I added 20ml of 0.5M sulphuric acid containing 9 drops of 2M sodium hydroxide. I then leached the mixture for 15 minutes using a magnetic stirrer. In the same standard procedure I continued to increase the pH by adding more drops of sodium hydroxide that is from 9 to 34 and 50 drops.
thank you
I need to know the particle size for the test, concentration of acid, amount of sample to be tested and the apparatus to be used as well as how to analyze the solution.
some one please suggest me software for analysis of leaching pollutant in soil.I have the physio-chemical result of the soil.
Examples of articles of trivial scientific values:
1. Meswak extract did not have much effect on f