Utilizing method for utilizing tailings containing silver, lead and zinc to extract silver and waste slag of tailings containing silver, lead and zinc

Abstract

The invention belongs to the technical field of new materials, and environmental protection, and relates to a process method for preparing a precast concrete component. The process method is characterized in that silver is extracted from lead and zinc cyanide tailing powder containing a small amount of the silver through utilizing a technology, the silver is reduced in the tailing powder, and theremaining lead and zinc tailing powder is used for replacing part of cement; the method comprises the following steps that (1), lead zinc ore is subjected to cyanide extraction to generate a "package"effect on the silver in mineral powder, the content is quite high in lead and zinc cyanide tailing slag, and the risk that the lead and zinc tailing powder is applied to the precast concrete component is high, therefore, the cyanide tailing slag needs to be pretreated, and the cyanide tailing slag is ground to 200 meshes; (2), wet leaching is carried out on the cyanide tailing powder, the silveris released from the "package" through using a catalytic acidolysis iron leaching process, and cyanide leaching is achieved; (3) the lead and zinc cyanide tailing powder after reduction of the silveris dried for 5 hours to 3 days; and (4) the dry powder is admixed to cement, and the precast concrete component is made in combination with sand and gravel aggregates.

Description

technical field [0001] The invention belongs to the field of new material technology, environmental protection and energy saving technology, and relates to tailings precious metal recovery and tailings replacement of part of cement for the production of concrete prefabricated parts. Background technique [0002] With the rapid development of urban construction, rapid population growth, and accelerated urbanization and industrialization, mineral consumption and mining are increasing year by year, and tailings powder is accumulating more and more. It's getting more and more complicated. According to incomplete statistics, there are more than 9,000 large and medium-sized mines and 260,000 small mines in my country, and the corresponding tailings occupy more than 10,000 square kilometers of land. Long-term accumulation of tailings will not only pollute water, land, and air, but also cause major geological disasters. Since the 1980s in my country, there have been more than 200 d...

AI Technical Summary

Problems solved by technology

Taking lead-zinc tailings powder as an example, the tailings occupy the land, heavy metals and rare metals will destroy vegetation, pollute the land and groundwater, and at the same time, the weathering is serious, resulting in secondary dust and dust pollution, water pollution, etc.

The tailings contain heavy metal ions, and the toxic residual flotation agents even bring irreparable disasters to people

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