Recovery method for valuable metals in tailings

Abstract

The invention discloses a recovery method for valuable metals in tailings, and belongs to the field of treatment for tailings of nonferrous metallurgy. The method comprises the following steps of: mixing the tailings, bentonite and a chlorinating agent, then wet-grinding to generate green balls, drying the green balls and then carrying out chloridizing roasting in a rotary kiln, cooling the roasted balls to obtain qualified pellets, discharging the smoke generated during roasting through multi-stage washing, and conveying smoke dust containing the valuable metals in solution to form recovery solution; filtering the recovery solution to obtain a filter cake, that is, gold-silver-lead residues, and treating the gold-silver-lead residues to recover gold, silver and lead; adsorbing the filtrate after filtering through active carbon, and neutralizing by lime to obtain neutralized filter residue, that is, copper-lead-zinc residues, and treating the copper-lead-zinc residues to recovery copper, zinc and lead; and evaporating and concentrating the filtrate after neutralization, and then recovering the chlorinating agent. The method has the advantages of being low in requirements on the treated raw materials, high in adaptability, short in process flow, low in cost, simple to operate, high in recovery rate, and the like.

Description

technical field [0001] The invention relates to the field of tailing slag treatment of nonferrous metallurgy, in particular to a method for comprehensively recovering valuable metals from tailing slag. Background technique [0002] The main chemical composition of non-ferrous metallurgical tailings is: SiO 2 , Fe 2 o 3 , In addition, it also contains valuable metal elements such as Au, Ag, Cu, Pb, Zn, etc. Usually, the grade of gold is about 2-5g / t, and some are even as high as 8-10g / t. The tailings are rich in valuable metals and are secondary resources with high utilization value. [0003] At present, the utilization of tailings at home and abroad is not ideal. Many enterprises directly sell it to cement factories at a low price and use it as a cement ingredient. Although this method is straightforward and simple, it wastes secondary resources; the enhanced treatment method requires additives, which not only increases production costs, but also cannot comprehensively r...

AI Technical Summary

Problems solved by technology

[0003] At present, the utilization of tailings at home and abroad is not ideal

Many enterprises directly sell it to cement factories at a low price and use it as a cement ingredient. Although this method is straightforward and simple, it wastes secondary resources; the enhanced treatment method requires additives, which not only increases production costs, but also cannot comprehensively recycle other useful materials. Valuable metals; the high-acid leaching process can effectively recover gold and silver, and can also comprehensively recover some other valuable metals, but it will consume a large amount of sulfuric acid, and the subsequent wet treatment process is complicated, the amount of waste liquid is large, and the treatment of waste liquid is also difficult. There is a certain degree of difficulty, and at the same time the cost is high and the process is long; tailings are added as ingredients to the pyro-melting furnace. This method can effectively recover valuable metals such as copper, lead, gold and silver, but the production cost is high and the loss of metals is large, and Increased transportation costs and tailings losses

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