Boris Krstev

Goce Delcev University · Mineral Processing and Biotechnology

Zeolite-bearing tuff (stilbite) was shown to be an effective and efficient adsorbent for treating acid mine drainage (AMD). We tested the adsorption of zinc ions from a synthetic acid aqueous solution and AMD from the Sasa mine. The concentration of zinc ions in the AMD decreased from 2.219 to 0.564 mg/dm³ (74% removal). The solution pH, prior to t...

Zeolite bearing tuff (stilbite 27%) from Vetunica deposit, Republic of Macedonia was investigated as an adsorbent for removal of copper, zinc, manganese and lead ions from synthetic aqueous solutions. The aim of this study was to investigate the influence of the presence of competing cations on the individual adsorption of Cu2+, Pb2+, Zn2+ and Mn2+...

The adsorption of lead ions onto a zeolite bearing tuff (stilbite) from synthetic acid aqueous solution and acid mine drainage taken from Sasa mine, Macedonia, is elaborated in this paper. The results present that adsorption occurs efficiently in both of cases. The physical and chemical properties of the used natural material, zeolite bearing tuff,...

The adsorption of copper ions from synthetic aqueous solutions on natural zeolite (clinoptilolite) was examined. In order to determine the rate of adsorption and the copper uptake at equilibrium, a se- ries of experiments were performed under batch conditions from single ion solutions. Equilibrium data were evaluated based on adsorption (Langmuir...

p> The kinetics of manganese adsorption onto natural zeolite (clinoptilolite) were studied with respect to initial metal ion concentration and adsorbent mass. In order to select the main rate-determining step in the overall uptake mechanism, a series of experiments were performed under batch conditions from single ion solutions. Data obtained from...

Heavy metals are highly toxic and they must be removed from the polluted streams. Аdsorption by zeolites is currently considered to be very suitable for wastewater treatment because of its simplicity and cost effectiveness. The aim of this investigation was to compare adsorption efficiency of heavy metals (Cu, Zn, Mn and Pb) from aqueous solution u...

The kinetics of zinc adsorption onto natural zeolite (clinoptilolite) were studied with respect to initial metal ion concentration, adsorbent mass and initial pH value. In order to select the main rate-determining step in the overall uptake mechanism, a series of experiments were performed under batch conditions from single ion solutions. Data obta...

Flotation tailing dams affect the environment through the soil, water and air, and in that way they affect the plants and the animals as well as the people. This paper shows the quality of the soil according to the concentration of heavy metals in the surroundings of Sasa mine, more precisely, the Kocani valley which uses water from the dam Kaliman...

To improve kinetic flotation models, many first-order flotation kinetics models with distributions of flotation rate constants were redefined so that they could all be represented by the same set of three model parameters. As a result, the width of the distribution become independent of its mean, and parameters of the model and the curve fitting er...

The refractory or low grade lead/zinc domestic ores in Republic of Macedonia are investigated by conventional separation technology or flotation separation. In the mean time, investigations are directed to the new possibilities of leaching by microorganisms – bioleaching. The paper is result of these technologies and investigations carried out for...

To improve kinetic flotation models, many first-order flotation kinetics models with distributions of flotation rate constants were redefined so that they could all be represented by the same set of three model parameters. As a result, the width of the distribution become independent of its mean, and parameters of the model and the curve fitting er...

The improvement in the chalcopyrite copper Bucim mine are gone forward to renewed reagent regime, including and involving new reagents for increase d recovery of copper and gold. The optimization and mathematical linear models using gradient method Box and Wilson are good example for improvement of industrial recoveries in flotation circuit. In thi...

Флотациските хидројаловишта ако не се градат и управуваат по сите норми и стандарди, предвидени за таа намена, можат да претставуваат еколошки бомби. Тие во одредени услови и периоди можат да бидат големи загадувачи на непосредната околина, на површинските и подземните води и на воздухот. Значи, преку земјиштето, водата и воздухот, флотациските јал...

The biomass as an organic product may be used as a fuel, bio fuel or the raw material in the industry. The bio fuel may occured as a plant or animal origin. These may be used by their direct combustion. The most effectively usefull method for biomass utilization is finalization in the pellet product as combustion product. The pellets have had appro...

In this paper mathematical methods and optimization tools that make possibilities for appropriate, fast and sure presentation of some complex circuits in the mineral processing technologies will be shown. Lagrange multipliers include the analytical methods of optimization, the constraints that appear in the form of equations. Such methods of optimi...

In this paper will be shown the general concept of the techno-economical development in R.Macedonia, as a result of the closed privatization and including the direct investment in the field of education, economy and other fields of interest. An explication of the state and public legislative in the high education (Bologna, EKTS, Curriculum of Busin...

Abstract: The refractory or low grade cooper domestic sulphide - chalcopyrite ores in Republic of Macedonia are investigated by conventional flotation separation. In the mean time, investigations are directed to the new possibilities of leaching by microorganisms – bioleaching. The paper is result of these technologies and investigations carried ou...

Abstract: The refractory or low grade nickel laterite domestic ores in Republic of Macedonia are investigated by conventional magnetic separation technology or segregation-flotation-magnetic separation, or production and smelting to ferronickel. In the mean time, investigations are directed to the new possibilities of leaching by microorganisms – b...

Informatisation, internationalization and globalization have dramatically changed retail sector; speeding up the retail processes, creating new sale formats, fastening the increase of income etc. During the last decade, logistics influenced the development of retailing by cutting down costs and increasing the service quality level. The main purpose...

These investigations have developed an effective hydrometallurgical method to recover high-purity leadmetal and elemental sulfur from simulated galena synthetic mixtures eliminating sulfur gases and lead emissions, in contrast to the current high-temperature smelting technology. The method consists of different operations: oxidative leaching with p...

Dangerous and hazardous flotation tailings dams can be source of endangering of living environment. Intheir normal work and also in case of damages incidents in flotation tailings dams can be caused by natural catastrophe in the area or malfunctions due to unreliable work. Harmful chemicals, which can get to living environment at damages, can cause...

Mining industry was always considered as risky business. Uncertainties about ore body, volatile commodity prices, exchange rates, environmental issues, political/legislation risks make a capital investment puzzle for every decision maker throughout the industry. Major challenge of project evaluation is how to deal those risks/uncertainties. Several...

There is number of dust control problems in mineral processing plants.The principal plant sources of dust emissions are either from process or open sources as example:dumping and material transfer operations, bulk loading and unloading facility,crushing and grinding and product, raw materials and waste piles.In industry, many alternative control sy...

The design of auxiliary ventilation system (AVS) and optimal equpment selection can be a problem, especially in case of very long drivages and high rock temperature.Algorithms for calculation of AVS parameters are basically developed by use of essential relationship from fluid mechanics. In a leaky duct, in addition to the variation of pressure, th...

A huge list of current laterite operations or laterites processing is following: Fe -ni smelting, Matte smelting, Reduction roasting-ammonia leaching and HPA leaching. Apart from the above mentioned process routes, there have been many attempts to develop processes know as alternative processes, which have included: Sulphuric, Nitric acid leaching,...

The Administrative measures are reflected in the long-term analysis followed by the human factor. The administrative measures taken by the nuclear industry, and have proven to be very effective in cases of the tailing dams. They are based on: keeping accurate records; selecting appropriate staff; etc. Completing precise documentation and all possib...

In this paper will be shown computer application of softwares Minteh-1, Minteh-2 and Minteh-3 in Visual Basic, Visual Studio for presentation of two-products for some closed circuits od grinding-clasifying processes. These methods make possibilities for appropriate, fasr and sure presentation of some complex circuits in the mineral processing techn...