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Overview and flotation of non-ferrous metal associated gold ore
Non-ferrous metal ores often associated small amount of gold. These golds are usually contained in polymetallic ore, copper and copper- nickel ore mainly composed of Cu, Pb and Zn. The gold grade is not high, generally no more than 2 grams / ton. However, due to the large scale of non-ferrous metal deposits and the large amount of ore mining, associated gold production accounts for a large proportion of total gold production. Some important gold-producing countries such as the United States annual production of gold 40% of Cu, Pb, Zn, Ni-product of the former Soviet Union from 20% to 30%, 65% Japan gold metal from Copper, Lead and Zinc According to the survey, some of the larger copper deposits in China contain a certain amount of gold (see Table 1), the grade is 1~2g/t, and the gold grade of individual associated gold deposits is higher, up to 3~4g/t. Since the selection conditions of gold for processing ore are not exactly the same as those for non-ferrous metal minerals, some of the associated gold can be recycled in the process of sorting non-ferrous metal minerals; others need to provide certain Conditions, or need to use special gold extraction methods to recover, so when researching and recycling this part of the associated gold, you should first consider the non-ferrous metal minerals as qualified products, while at the same time enriching gold into non-ferrous metal concentrate products. , or enriched in products such as amalgamation and special gold extraction operations.
Table 1 Gold content of copper deposits in China
Mine serial number
Raw ore gold grade (g/t)
Mine serial number
Raw ore gold grade (g/t)
1
2
3
4
5
0.8～2.0
0.7 to 0.8
1.0 to 1.6
0.8
<0.5
6
7
8
9
10
0.5 to 1.6
1.0 to 1.5
0.7 to 0.8
0.7
>1.0
Generally, using the flotation process non-ferrous ores, and pyrite, chalcopyrite, galena fine gold with students can enrich the way various flotation concentrate, as a byproduct of the smelting send Factory processing. If the natural gold particles are coarser, the mercury should be mixed and re-elected in the grinding-grading cycle before the copper-lead flotation. This ensures sufficient recovery of the coarse gold. When re-selection of coarse gold, it is necessary to take care to prevent adverse effects due to low pulp concentration and large amount of water, which may cause adverse effects on the next stage of classification and sorting (sometimes in amalgamation operations). The mine is dehydrated.
For the treatment of polymetallic ore containing a small amount of gold, the key is to master the occurrence of gold in the ore, the symbiotic relationship between gold and various minerals, and use this as a basis to develop a reasonable gold selection process. For example, when gold is mainly produced in the form of free gold in ore, gold should be recovered by amalgamation or re-election process. When gold is closely related to a certain mineral, the preferential flotation process can be used to concentrate the gold into various product concentrates for smelting and recovery.
When flotation of polymetallic gold-bearing ores, it is important to know the amount of inhibitor. For example, in gold-bearing primary copper ore, pyrite is generally included. In order to suppress iron floating copper, lime is often used as an inhibitor. Since lime also has an inhibitory effect on gold, it is necessary to grasp the range of the amount of lime when there is floating copper. This will not only avoid the loss of gold from pyrite from the tailings, but also the selection of copper concentrates with higher grades. If pyrite is also produced as a separate sulfur concentrate, the amount of lime can be adjusted over a large range during the copper-sulfur separation process. Because the gold entering the sulfur concentrate can be recovered in the subsequent cyanidation process or smelting process.
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