Junhui Xiao

Southwest University of Science and Technology · School of Envrionment and resource

In this study, we investigated coarse anatase concentrate composed of 35.63% TiO 2 , 15.22% Fe 2 O 3 , 10.68% Al 2 O 3 , and 13.18% SiO 2 , containing mainly anatase, kaolinite, hematite, and quartz. The concentrate was treated via roasting, water leaching, and magnetic separation. The addition of NaOH promoted the transformation of kaolinite and q...

In this study, we investigated the separation of iron and scandium from Sc-bearing red mud. The red mud object of our study contained 31.11% total iron (TFe), 0.0045% Sc, hematite (Fe2O3) and ferrosilite (FeO·SiO2) as the main Fe-bearing minerals. The Sc-bearing red mud was treated by a novel deep reduction roasting and magnetic separation process...

Scandium concentrate and titanium dioxide wastewater (TDWW) all belong to waste, especially TDWW belongs to hazardous waste, it is urgent to find a more efficient and safer treatment method to deal with them, and both waste acid and waste ore contain scandium. The use of waste acid as a leaching agent can achieve the synergistic recovery effect of...

In this study, a scandium concentrate with Sc2O3 content of 66.24 g/t was obtained from V-Ti magnetite tailings by physical concentration, and the main Sc-bearing minerals were augite and hornblende. A novel process of roasting and leaching was proposed to extract scandium from scandium concentrate with titanium dioxide wastewater. Scandium concent...

We investigated a coarse phosphogypsum containing 49.63% SO3, 41.41% CaO, 10.68%, 4.47% SiO2, 1.28% P2O5, 0.11% F, 80.65% CaSO4·2H2O, and whiteness of 27.68. Phosphogypsum contains calcium sulfate dehydrate (CaSO4·2H2O) as the main mineral, with small amounts of brushite (CaPO3(OH)·2H2O), quartz (SiO2), muscovite (KAl2SiO10(OH)), and zoisite (Ca2Al...

Recycling spent lithium-ion batteries (LIBs) is essential for sustainable resource utilization and environmental conservation. In this research, we have achieved simultaneous removal of organic matter, dis-sociation of electrode material, and reduction of high valence transition metal through the process of in situ thermal reduction, which are key...

In this study, a cleaner process of water leaching was proposed to extract vanadium from V-bearing roasted ore with V2O5 content of 1.06 wt.%, and the main mineral compositions of the roasted ore were quartz, gypsum, misenite and munirite. The effects of water leaching parameters such as leaching temperature, leaching time, liquid-solid ratio, leac...

Rare metal gallium is classified as a strategic material because of continued high demand, uncertain supply, and low reserves. Corundum flue dust (CFD) is generated during bauxite smelting to produce brown corundum. Gallium (Ga), Zinc (Zn), and potassium in the bauxite could be enriched with CFD through this process, so CFD is regarded as one of th...

Exploring a scientific quantitative evaluation for energy efficiency and its improvement in jet milling process is of great significance for energy saving and emission reduction. In this study, three classical comminution breakage models, E-S breakage probability model, A-b breakage model and E-M breakage model, were modified by conducting comminut...

During the flotation separation process of bastnaesite, it is difficult to separate bastnaesite from fluorite effectively. In this present study, sodium silicate (SS) can effectively improve the flotation separation effect of bastnaesite and fluorite in salicylhydroxamic acid (SHA) systemasa. Through relevant analyses, such as Zeta potential measur...

We have investigated Bayer red mud with a TFe content of 26.86% collected from the Pingguo area of China, and have found that iron is the key metal affecting the extraction of valuable components such as Sc, Ti, and Ga. Based on this, an efficient process of roasting with calcium salt and magnetic separation has been proposed to extract iron from t...

In this study, the effect and mechanism of ultrasound on gallium and zinc leaching from corundum flue dust (CFD) were investigated systematically. The conditions for the leaching of valuable metals were optimized while varying the parameters such as leaching time, sulfuric acid concentration and leaching temperature. It was found that under the con...

The huge reserves of red mud have a significant potential source of scandium. The scandium can be recovered from red mud by direct acid leaching but the extraction yields are generally low, and the leaching efficiency of iron and silicon is higher. Therefore, the highly selective process steps (a combined sulfation-roasting-water leaching process)...

In this study, we investigated a coarse phosphogypsum containing 49.63% SO3, 41.41% CaO, 10.68%, 4.47% SiO2, 1.28% P2O5, 0.11% F, CaSO4·2H2O purity of 80.65%, and whiteness of 27.68. Phosphogypsum contains calcium sulfate dehydrate as the main mineral, with small amounts of brushite, quartz, muscovite, and zoisite. Harmful elements, such as silicon...

Electrostatic separation is a cleaning physical method to recover metals from waste printed circuit boards (WPCBs), but it has poor separation efficiency for finer sized fractions. In this study, electrostatic separation enhanced by air classification was used to recover residual metals from − 0.5 mm non-metallic fractions in WPCBs. Under the optim...

In this study, the selective depression of arsenopyrite in pyrite flotation with in-situ generated nanoparticles was studied. Scanning electron microscope and energy dispersive X-ray spectroscopy (SEM/EDS) detection, solution chemistry analysis, fourier transform infrared spectroscopy (FTIR), adsorption tests and contact angle measurement were used...

A new bauxite-type vanadium ore with a grade of 0.96% V2O5 was found in Hanzhong, China, having quartz, illite, and calcite as the main mineral constituents and vanadium that mainly occurs in the aluminosilicate lattice of illite by replacing Al3+ with V3+ in isomorphism form. In this study, a novel process of low-temperature sulfating roasting–wat...

In this paper, sodium oleate, polyacrylamide, soluble starch and sodium carboxymethyl cellulose were used as flocculants to study the flocculation and sedimentation behavior of microfine ilmenite. Sedimentation test shows that sodium oleate and polyacrylamide have good flocculation effect on ultrafine ilmenite. The flocculation rate of ilmenite can...

Steam jet milling was applied for the first time to ultra-fine grind the filter cake (moisture content 23.80%) produced by a kaolin concentrator. The material was dehydrated and dried simultaneously during grinding, and the final ground sample met the moisture content requirement for powder products of <2%. The particle size of the ground kaolin sa...

In this study, magnesia–nickel silicate ore was investigated, which contained 0.83% Ni and antigorite, chlorite, magnetite (Fe3O4), quartz, and mica as the main minerals. Chloride roasting and magnetic separation were used to treat the ore. The addition of red mud enhanced the transformation of nickel silicate to a strongly magnetic mineral mainly...

In this study, a magnetic separation–shaking table gravity separation process was used to treat Sc-bearing V–Ti magnetite tailings, and the Sc2O3 content in the Sc concentrate was enhanced from 0.0039 to 0.0061%. The majority of the Sc in the Sc concentrate originates from augite, hornblende, and aluminosilicate. Magnesium chloride and the Sc conce...

In this research, the coarse manganese concentrate was collected from a manganese ore concentrator in Tongren of China, and the contents of manganese and iron in coarse manganese concentrate were 28.63% and 18.65%, respectively. The majority of the minerals in coarse manganese concentrate occur in rhodochrosite, limonite, quartz, olivine, etc. Calc...

Red mud as the main byproduct generated during alumina extraction from bauxite. Owing to the high iron content in the red mud and the high correlation between iron and scandium during the leaching process, it is necessary to extract the iron from the red mud and to further enrich the scandium in advance for the acid leaching extraction of scandium....

In this study, a one-step rapid heating novel process was used to prepare high-purity anhydrous scandium chloride molten salt with low-purity scandium oxide. High-purity anhydrous ScCl3 molten salt was used as the Sc-bearing raw material for preparing the Sc-bearing master alloy. Inert gas was used to enhance the purity of anhydrous scandium chlori...

In this study, there is 1.42% P2O5 in the P-containing V-Ti magnetite tailings in Miyi Region of China, with the valuable minerals mainly including apatite, and aluminosilicate minerals as the main gangue components. The direction flotation process was used to recover phosphorous from the low-grade phosphorous-bearing V-Ti magnetite tailings. The r...

In this study, preparation of Al–Mg–Sc master alloy tests were carried out by Al–Mg thermoreduction method. Stirring by blowing argon and pressing with molten salt jar were adopted to reduce scandium segregation and upgrading scandium recovery of scandium-bearing master alloy. The results show that the Al–Mg–Sc master alloy ingot contained 2.90% Sc...

In this study, a high-phosphorus oolitic iron ore containing 44.70% Fe and 1.56% P from western Hubei of China was collected as the sample. The chemical composition, mineral composition, structure characteristics, dissemination characteristics, and iron and phosphorus occurrence state were carried out to investigate the mineralogical characteristic...

In this study, segregation roasting and magnetic separation are used to extract nickel from a garnierite laterite ore. The garnierite laterite ore containing 0.72% Ni, 0.029% Co, 8.65% Fe, 29.66% MgO, and 37.86% SiO2 was collected in the Mojiang area of China. Garnierite was the Ni-bearing mineral; the other main minerals were potash feldspar, fors...

In this study, sulfuric acid leaching and gravity shaking-table separation by shaking a table are used to extract lead and zinc from a Pb-Zn oxidizing roasting cinder. The oxidizing roasting cinder—containing 16.9% Pb, 30.5% Zn, 10.3% Fe and 25.1% S—was obtained from a Pb-Zn sulfide ore in the Hanyuan area of China by a flotation-rotary kiln oxidiz...

In this study, a roasting-hydrolysis-acid leaching process is used to extract scandium from the scandium rough concentrate. The scandium rough concentrate containing Sc2O3 of 76.98 g/t was obtained by magnetic separation, gravity separation, and electric separation from Sc-bearing Vi-Ti magnetite tailings in the Panxi area of China. The majority of...

In this study, oxidizing roasting, segregation roasting, and magnetic separation are used to extract cobalt and iron from refractory Co-bearing sulfur concentrate. The Co-bearing sulfur concentrate containing 0.68% Co, 33.26% Fe, and 36.58% S was obtained from V-Ti magnetite in the Panxi area of China by flotation. Cobalt pyrite and linneite were t...

Red mud is the main solid waste generated by the aluminum industry for the extraction of alumina. Considering the environmental problems associated with red mud, the recovery of iron from bauxite slag is still a promising field. The effect of sodium sulfate on the red mud separation roasting-magnetic separation process was studied. The results show...

Coal flotation tailings (CFT) was calcined to be used as a supplementary cementing material. CFT and its calcined products were characterised by thermogravimetric analysis (TGA), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy. The pozzolanic activity of the calcined products was analysed by the strength activity index. The hydr...

Micro-flotation, zeta potential, fluorescence emission, interface topography and XPS tests were carried out to investigate the flotation and adsorption of sodium oleate (NaOl) on powellite. Micro-flotation results show that the flotation recovery varies with different Ca²⁺ concentrations in pulps. The greater negative charge on the washed powellite...

The iron-bearing ore, existing in the form of oolite, was mainly composed of hematite, limonite, daphnite, and collophane. The harmful element phosphorus content was 1.56%, belonging to high phosphorus ooliticiron ore in western Hubei. In this study, segregation roasting and low intensity magnetic separation techniques were applied for upgrading ir...

The difference in flotation and adsorption mechanism of mixed sodium oleate (NaOl)/dodecylamine (DDA) and NaOl/cetyl pyridinium chloride (CPC) collectors on molybdite was comparative studied through micro-flotation, fluorescence emission spectroscopy, zeta potentials measurement, adsorption tests and FTIR measurement. The flotation results show tha...

The scandium containing mineral type, content and dissemination characteristics of a rare earth mine in western of Sichuan province were analyzed by chemical analysis, X-diffraction, polarized light microscopy and electron probe spectroscopy, which provides an important research basis for comprehensive utilization of scandium. The results show that...

The objective of this paper is to display the results of the flotation and adsorption behaviors of benzohydroxamic acid (BHA), potassium amyl xanthate (KAX), dodecylamine- hydrochloride (DDA), mixed BHA/DDA and KAX/DDA on smithsonite. The flotation results show a collecting ability sequence of BHA > KAX > DDA on smithsonite and the best flotation p...

In this study, flotation and adsorption of cetyl pyridinium chloride (CPC), a novel cationic collector for molybdite and fluorapatite, were comparatively investigated by flotation tests, zeta potential measurements, adsorption tests and fluorescence spectroscopic analysis. The flotation results demonstrated a large difference in molybdite and fluor...

The scandium-containing titanium ore in Yunnan contains TiO2 with grade of 12.68%, Fe with grade of 31.65%, and Sc2O3 with grade of 92 g/t. Scandium is mainly distributed in titanaugite, titanomagnetite and magnetite pyroxene. The scandium concentrate with c2O3 grade of 266 g/t and scandium recovery of 90.34% and the titanium concentrate with TiO2...

Heap leaching is a promising, less expensive, alternative technology for processing low-grade gold ores compared with traditional, energy-intensive processes (e.g., autoclave/tank leaching). The effects of lime on the heap leaching of gold ores from Ajialongwa gold mine in China were investigated. Leach tests included column leach tests, the pilot...

The flotation and adsorption mechanism of dodecyl trimethyl ammonium chloride (DTAC) on kaolinite with different particle size were studied by flotation tests, Zeta potential measurements and Materials Studio simulation. The results show that with the increasing of pH, the flotation recoveries of kaolinite decrease. Under acidity, the flotation rec...

The research on the flotation performance of cetylpyridinium chloride (CPC) was carried out. And the adsorption mechanism of CPC as a new collector on molybdite and apatite was discussed. Flotation experiments results show that the influence of pH value on molybdite flotation is weak and the recovery of molybdite can be up 73.2% with 2 mmol/L CPC a...

Tin tailings in Bolivia contains Cu (grade of 0.84%), WO3 (grade of 0.64%) and Sn (grade of 0.84%), the copper mineral is predominately present in chrysocolla, but some copper minerals are output in form of solid solution with tungsten and tin mineral. Tungsten is predominately present in wolframite. Tin is predominately present in cassiterite. Ado...

The flotation behaviors and solution chemistry mechanism of sodium oleate on kaolinite have been studied by flotation tests, solution chemistry calculations, Zeta potential measurements and infrared spectroscopic analysis to provide theoretical guidance for efficient flotation of kaolinite and direct flotation of bauxite. The point of zero charge (...