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According to the storage characteristics of gold ore, it can be divided into five types: depleted sulfide gold ore, polysulfide gold ore, gold-bearing polymetallic ore, gold-telluride-containing gold ore, and gold-bearing copper ore. Different types of gold ores have different mineral compositions and ore properties, so the gold ore beneficiation processes used are also different.
Most of the sulfide-poor gold ores are of quartz vein type, and the sulfides mainly exist in the form of pyrite with a small content, and are often associated with copper, lead, zinc, tungsten and other minerals. Large, is the only recycling object, other elements have no industrial value and are only recycled as by-products. This type of ore is recovered by a relatively simple beneficiation process, and the commonly used methods are flotation and all-sliming cyanidation.
Polysulfide gold ores have high sulfide content, mostly found in pyrite and arsenopyrite. The grade of gold in this kind of ore is low, the gold particle size is relatively small, and it is mostly wrapped in pyrite and arsenopyrite, so The beneficiation process of this kind of ore is relatively complicated. Generally, gold and sulfide are separated together by flotation method, and gold and sulfide are separated by cyanide method.
Gold-bearing polymetallic ores contain 10%-20% sulfide, and are also symbiotic with copper, lead, zinc, silver, antimony and other metals, and these metals have independent recovery value. The particle size of gold in this kind of ore varies widely, the distribution of particle size is uneven, and it is closely symbiotic with sulfide and various metal minerals, so the beneficiation process is more complicated. Generally speaking, most of them will choose the joint separation process. The specific process requires It is determined according to associated metallic minerals and gangue minerals.
The gold minerals in the gold ore containing gold telluride are mainly natural gold, but a considerable part of gold is also present in the gold telluride. The process is relatively complicated. The flotation method is mainly used for recovery, supplemented by roasting, cyanide, etc. craft.
Gold-bearing copper ores are similar to gold-bearing polymetallic ores, but the grade of gold in this type of ore is lower, which is the main comprehensive recovery element, and the symbiotic relationship with copper minerals is complicated. Generally, copper and gold are obtained by mixed flotation by flotation method Concentrate, and then carry out pyrometallurgy to the concentrate, and recover gold during the smelting process.
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