Separation-flotation technology of rough sand and secondary slime of vein gold ores

Abstract

The invention relates to a separation-flotation technology of rough sand and secondary slime of vein gold ores. The separation-flotation technology is especially and mainly applied to ore dressing of the quartz vein type ores of gold-carrier ores, mainly iron pyrites. The separation-flotation technology includes the following steps of ore grinding grading operation, rough sand flotation operation, secondary slime flotation operation and combining forming operation of total gold ore concentrate. The recovery rate of gold of the obtained total gold ore concentrate is larger than or equal to 95.46%, the recovery rate of the gold is obviously improved, the use efficiency of resources is improved and the separation-flotation technology is small in use amount of medicaments and reduces environment pollution.

Description

technical field [0001] The invention relates to a separation-flotation process of coarse sand and secondary slime of vein gold ore, which is especially suitable for beneficiation of quartz vein type ore whose gold-carrying mineral is mainly pyrite. Background technique [0002] The world's gold reserves are about 40,000-64,115 tons, mainly vein gold, placer gold and polymetallic ore-associated gold, of which vein gold and placer gold account for 75%, and associated gold accounts for 25%. At present, the world's vein gold production accounts for about 65% to 75%, and the production of alluvial gold and associated gold accounts for about 25% to 35%. Among the geological reserves of gold in my country, vein gold accounts for 42.23% of the total reserves, placer gold accounts for 11.51%, and associated gold accounts for 46.26%. With the massive development and utilization of vein gold ore resources, there are fewer and fewer gold mines that are easy to select and process, and m...

AI Technical Summary

Problems solved by technology

The roasting oxidation method is characterized by strong adaptability. With the improvement of environmental protection requirements, the cost of waste gas treatment increases, and this method is subject to certain restrictions.

The disadvantage of the pressurized oxidation method is that the design and material of the equipment are very high, the equipment is corroded seriously, the maintenance level is also high, and the capital investment cost is large.

The disadvantage of nematode oxidation technology is that it is difficult to domesticate bacteria, the process operation conditions are sensitive, and bacteria are easy to die

The disadvantage of the all-slime cyanidation carbon slurry method is that highly toxic hydrocyanic acid will be produced during the acid treatment process, and a large amount of cyanide-containing waste liquid will be discharged, which will cause great pressure on environmental protection

The flotation-cyanide carbon pulp method uses 70-95% less cyanide than the whole mud cyanide carbon pulp method, and is currently one of the most effective gold extraction processes in my country. The flotation process of the flotation-cyanide carbon pulp method has Generally, the gold grade of the concentrated ore should reach above 50g / t, and a large number of fine particles (secondary slime) are produced during the grinding process of the flotation process of flotation-cyanide carbon pulp method. The greater the harmful effects of flotation, the current non-separation flotation process of coarse sand and secondary slime is not effective, and the gold recovery rate is usually below 91%. It is very difficult to increase the recovery rate of gold by this process.

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