Study On Gold Extraction Process Of Carbon - Containing High Arsenic Fine Gold Gold Deposit

As Chinese exploitation of gold resources and mined gold ore accounted for about one-third of refractory gold ores. Carbonaceous, micro-fine gold deposit is a typical refractory gold ores. Since the carbonaceous fine particles and micro-gold mineralization process is often accompanied by other harmful elements symbiosis, such as parcels in serious condition, high in arsenic and other harmful elements, etc. Therefore, the use of traditional gold extraction process usually results in the gold leaching low rate, resulting in a waste of resources. For the gold deposits of domestic and foreign researchers have proposed a variety of different kinds of methods, largely concentrated in the roasting method to eliminate the use of carbonaceous material impact on the gold leaching pretreatment and inhibition of carbonaceous material to leach gold mine for free Study cyanide agents have the appropriate research, but less suitable for production practices. Therefore, to find a simple, inexpensive, leaching rate, while suppress or handle new technology and new methods will have other harmful elements such refractory gold deposits in the extraction of vast significance. In this paper, the fine particle carbon-containing high arsenic gold mine mineral characteristics and a comprehensive analysis of existing studies, while sodium hypochlorite leaching gold thermodynamics analysis, similar to the experimental program of exploratory trial and sodium hypochlorite direct leaching gold previous studies, experiments Laboratory tests carried out a systematic study of the gold mine, by the level of complexity of the process and the leaching rate of the screening test programs individually preferred. The main research work and results are as follows:1. The comprehensive study of the mineral composition of the gold ore, metallurgical analysis, phase analysis of carbon, gold occurrence, pyrite particle electron microscopy analysis, the gold mine of the arsenic, carbon-containing, sulfur and other harmful elements, Occurrence of fine gold particles, and determined that the difficult process gold mine gold mine.2. The high carbon content of the micro-fine gold mine arsenic conventional gold extraction process has been reviewed, analyzed the Northwest Nonferrous Geological Institute presented the final recommendations mention the problems in the fellowship program, that is, for the carbon-containing high arsenic micro fine cyanide gold mine under the direct leaching cyanide leaching of the flotation scheme is low, the test direct leaching rate was 51.48%, the final gold recovery rate of only 75.56% of the metal, the method does not come to extract the gold the best solution mine. Through the analysis of the earlier proposed testing direction and test the assumption that carbon-containing high arsenic micro-fine gold mine, in order to test the next study provides a clear road.3. Access to relevant research at home and abroad in carbonaceous gold deposit, discovered sodium hypochlorite may be gold leaching, therefore, thermodynamics analysis of sodium hypochlorite. Found that Au-Cl-H20 gold leaching system environment range (pH) is widely used for relatively low gold mine content requirements, either basic conditions or acidic conditions could well achieve the purpose of leaching of gold, from the purely theoretical analysis there are obvious advantages of gold leaching system. Access to pertinent information found much faster than sodium hypochlorite leaching gold cyanidation leaching gold from a theoretical analysis of the thermodynamic sodium hypochlorite leaching gold the advantages far outweigh cyanidation.4. Based on past tests and theoretical analysis of the system proposed route as the two trials related to the carbon-containing high arsenic micro-fine gold deposit Experimental research programs, namely chemical pretreatment-cyanidation leaching gold and sodium hypochlorite method, tested Research and analysis, sodium hypochlorite leaching process gold as the carbon-containing high arsenic final micro-fine gold mine scheme.5. Northwest Nonferrous Geological Institute and the proposed leaching gold sodium hypochlorite solutions for technical, economic, environmental reported to arrive at the pros and cons of.Through systematic experimental study of the carbon-containing high arsenic micro-fine gold mine, we found that the use of sodium hypochlorite two-stage leaching process can directly improve the leaching rate of gold deposits to 77.04 percent, after the finalization of sodium hypochlorite explore two leaching process parameters are as follows:solid-liquid ratio of 1:5, sodium hypochlorite in chlorine concentration of 3%, ore grinding fineness of 200 mesh or less accounted for 90%, the leaching time period of four hours, two stage leaching time was 4 hours. And Technology, Northwest Nonferrous Geological Institute presented for comparison, sodium hypochlorite has a two-stage leach leaching rate, the process is simple, easy to operate, less environmental impact, etc., to provide effective treatment options for the carbon-containing high arsenic Fine Particle gold mine.Sodium hypochlorite two leaching technology for the carbon-containing, arsenic, micro-fine gold mine provides a program to expand the idea of gold, lifting fellowships agent for non-cyanide increases related to study drug.