microwave heating of refractory minerals

microwave heating of refractory minerals

Microwave Heating Applications in Mineral Processing ...

10/12/2011  The information compiled in this chapter demonstrates that microwave energy has the potential for application in mineral treatment and metal recovery processes such as heating, drying, grinding, leaching, roasting, smelting, carbothermic reduction of oxide minerals, pretreatment of refractory gold concentrate or ore,

Recent developments in microwave processing of minerals

period of several years is the use of microwave heating technologies to improve the efficiency of various mineral processing unit operations including: leaching, refractory gold ore treatment ...

High Temperature Microwave Heating in Refractory

Microwave energy can be used to create high temperatures (> 1700° C for alumina) in refractory materials. Energy conversion takes place with a very good efficiency (90% in the conversion process of microwaves to thermal energy) if an appropriate applicator is utilized. Experiments at 2.45 GHz involving either the sintering of alumina or melting of ...

Microwave energy for mineral treatment processes—a brief ...

01/07/1999  The RD results demonstrate that microwave energy has potential in mineral treatment and metal recovery operations such as heating, drying, carbothermic reduction of oxide minerals, leaching, roasting/smelting, pretreatment of refractory gold ore and concentrate, spent carbon regeneration and waste management. However, challenges remain to be overcome through a

Microwave energy for mineral treatment processes—a

01/07/1999  The RD results demonstrate that microwave energy has potential in mineral treatment and metal recovery operations such as heating, drying, carbothermic reduction of oxide minerals, leaching, roasting/smelting, pretreatment of refractory gold ore and concentrate, spent carbon regeneration and waste management. However, challenges remain to be overcome through a fundamental

High Temperature Microwave Heating in Refractory

Microwave energy can be used to create high temperatures (> 1700° C for alumina) in refractory materials. Energy conversion takes place with a very good efficiency (90% in the conversion process of microwaves to thermal energy) if an appropriate applicator is utilized. Experiments at 2.45 GHz involving either the sintering of alumina or melting of ...

Applications of microwave heating in minerals processing

Microwave heating has been applied to a number of minerals processing applications. Walkiewicz et al., 1988 present data on microwave heating of a number of minerals, and speculate on the potential reduction in grinding energy required for minerals with stress fractures induced by microwave heating. Bradhurst and Worner, 1990 discuss applications of microwave heating in mineral processing and

Removal of arsenic and sulfur from a refractory gold ...

01/01/2010  It has been demonstrated that microwave heating of primary refractory gold ores not only effectively oxidizes the sulfide matrix and so increases gold recovery during the cyanidation process, but also has the potential to significantly reduce the operating cost compared to other pretreatment processes, such as autoclave, roaster, bio-oxidation (Tranquilla, 1997).

The Effects of Power Level on the Microwave Heating of ...

The effect of power level on the microwave heating characteristics of a variety of reagent-grade chemicals and minerals has been determined in a Bureau of Mines study. Heating rates of the powdered samples are presented for incident power ranging from 500 to 2,000 W at 2.45 GHz. The apparatus consisted of a WR 975 waveguide-applicator mounted to WR 284 waveguide sections and connected

Recent developments in microwave processing of

18/07/2013  One such area which has shown particular promise over a period of several years is the use of microwave heating technologies to improve the efficiency of various mineral processing unit operations including: leaching, refractory gold ore treatment, grindability and liberation and coal grinding. Each of the above areas is reviewed and the main reasons that have either ensured or hindered

Microwave heating characteristics of selected minerals

Naturally occurring minerals and reagent-grade compounds were tested to determine their receptivity to microwave heating. The maximum temperature achieved for the samples and the time required to reach temperature are reported. A description of the microwave oven and a thermocouple technique that accurately measures and continuously records the temperature of samples during irradiation are reported. Extractive applications using the generated microwave

Review Pretreatment Process on Refractory Gold Ores with As

eral absorption properties to heat minerals. In this way, gold, arsenic and sulfur can be separated from ores. The technical advantages of microwave roasting are selectively heating materials, fast heating rate and high heating efficiency. Microwave heating has the effect of reducing the tempera-ture of chemical reaction. So it can avoid generating gases of SO2 and As2O3 by controlling the ...

Pretreatment Process on Refractory Gold Ores with As

It uses mineral absorption properties to heat minerals. In this way, gold, arsenic and sulfur can be separated from ores. The technical advantages of microwave roasting are selectively heating materials, fast heating rate and high heating efficiency. Microwave heating has the effect of reducing the temperature of chemical reaction. So it can avoid generating gases of SO

Microwave Heating Of Refractory Minerals

microwave heating of refractory minerals - bnbinc. Application Prospect of Microwave Roasting in Due to the microwave heating has the advantages of fast ... Removal of arsenic and sulfur from a refractory gold ... Removal of arsenic and sulfur from a refractory gold concentrate by microwave ... gold concentrate by microwave heating ... minerals in the refractory ... Extraction of Gold from ...

Recent developments in microwave processing of

18/07/2013  One such area which has shown particular promise over a period of several years is the use of microwave heating technologies to improve the efficiency of various mineral processing unit operations including: leaching, refractory gold ore treatment, grindability and liberation and coal grinding. Each of the above areas is reviewed and the main reasons that have either ensured or hindered development to a

Microwave heating characteristics of selected minerals

Naturally occurring minerals and reagent-grade compounds were tested to determine their receptivity to microwave heating. The maximum temperature achieved for the samples and the time required to reach temperature are reported. A description of the microwave oven and a thermocouple technique that accurately measures and continuously records the temperature of samples during irradiation are

The Use Of Microwave In Refractory Ore Benification

microwave heating of refractory minerals ... Microwave pretreatment of a double refractory gold ore Microwave-assisted grinding and liberation of processing. Read more. pretreatment of refractory gold ore with microwaves ... Study on Pretreatment of Refractory Gold Ore by Microwave roasting method was applied for the pretreatment of refractory ... Pretreatment of Refractory Ore in ...

Synthetic Ore Samples to Test Microwave/RF Applicators and ...

Recent studies have shown that microwaves heat some minerals faster than others. This creates the opportunity to use microwaves to selectively heat minerals to enhance separation of valuable minerals from gangue minerals. This opportunity has been investigated by studying the heating process under controlled conditions. It involved creating synthetic samples of ore using pyrite grains

Minerals Free Full-Text Microwave Treatment of ...

Since minerals have varying microwave absorption characteristics, different minerals within the same particle heat differentially upon exposure to microwaves. The differential heating of constituent minerals generates thermal stresses within particles and can lead to fracture. The fracturing often occurs along mineral grain boundaries, which can result in improved mineral liberation and ...

Review Pretreatment Process on Refractory Gold Ores with As

eral absorption properties to heat minerals. In this way, gold, arsenic and sulfur can be separated from ores. The technical advantages of microwave roasting are selectively heating materials, fast heating rate and high heating efficiency. Microwave heating has the effect of reducing the tempera-ture of chemical reaction. So it can avoid generating gases of SO2 and As2O3 by controlling the ...

Pretreatment Process on Refractory Gold Ores with As

It uses mineral absorption properties to heat minerals. In this way, gold, arsenic and sulfur can be separated from ores. The technical advantages of microwave roasting are selectively heating materials, fast heating rate and high heating efficiency. Microwave heating has the effect of reducing the temperature of chemical reaction. So it can avoid generating gases of SO

Microwave selective heating-enhanced reaction rates

The ultra-fast heating rate of microwaves, due to selective heating, accelerated the nucleation and growth of mullite grains and changed the mullitization route of kaolinite. Before mullitization, the capacity for microwave absorption of decomposed kaolinite is dependent on the amount of structural OH up to a temperature of 522 °C and is then dependent on the amount of metakaolinite, gamma ...

Removal of arsenic and sulfur from a refractory gold ...

DOI: 10.1016/J.MINENG.2009.09.018 Corpus ID: 96686003. Removal of arsenic and sulfur from a refractory gold concentrate by microwave heating @article{Shaojian2010RemovalOA, title={Removal of arsenic and sulfur from a refractory gold concentrate by microwave heating}, author={Ma Shao-jian and W. Luo and W. Mo and Su Xiu-juan and P. Liu and Yang Jin-lin}, journal={Minerals Engineering},

Minerals Engineering Conferences - Microwave

Microwave assisted liberation of Black Mountain mine zinc bearing minerals and oil-water emulsion separation A.F. Mulaba – Bafubiandi (University of Johannesburg, South Africa) Desulfur and de-arsenic of refractory gold concentrate by microwave roasting Shaojian Ma et al (Guangxi University, P.R.China)