Method for efficiently enriching rare precious metals from complex low-grade heat filter residues

Abstract

The invention provides a method for efficiently enriching rare precious metals from complex low-grade heat filter residues. The method comprises the following steps: performing first-stage normal-pressure preliminary leaching and second-stage normal-pressure desulfurization leaching on the heat filter residues; performing evaporation, concentration and crystallization on a first-stage desulfurization liquid to obtain a sodium thiosulfate product; performing pressurization oxidation leaching on second-stage desulfurization residues; and removing silicon, iron, barium, calcium magnesium, aluminum, complex silicates and the like from glass residues prepared from pressurized residues, thereby obtaining a high-grade product rich in precious metals. The method is simple in process, environmentally-friendly, free of generation of toxic waste gases, gas residues and like as well as free of usage of toxic reagents, thereby being favorable for environmental protection. The method is easy to operate, low in working intensity, high in efficiency and easy in production process control and capable of easily realizing the process automation. According to the method, a high-grade and good-quality precious metal concentrate in which the content of gold, silver and platinum group metals can be 9% to 15% is obtained; and the recovery rate of the precious metals can be more than 99%. Thus, the method provided by the invention can be easily matched with an extraction separation refining process of the gold and platinum group metals.

Description

technical field [0001] The invention belongs to the technical field of rare and precious metal hydrometallurgy, and relates to a method for separating and extracting rare and precious metals from sulfur molten hot filter residues, in particular to a method for efficiently enriching rare and precious metals from complex and low-grade hot filter residues. Background technique [0002] In the metallurgical process of extracting nickel and cobalt containing rare precious metals, especially copper-nickel sulfide ores, the copper-nickel high matte containing gold and platinum group metals is processed by crushing, grinding, grading, magnetic separation, flotation and other processes to obtain gold and platinum Primary alloys of group metals, copper concentrates and nickel concentrates with low copper content (Cu2~5%, Ni63~67%, S22~24%). The nickel concentrate is melted in a reverberatory furnace and cast into an anode plate (called a high matte anode plate), and then subjected to ...

AI Technical Summary

Problems solved by technology

This treatment method has a long process flow and a large turnover of materials. Some precious metals and sulfur elements are circulated in it and dispersed in the nickel and cobalt refining system. The other part of the hot filter residue is stored in the open air for a long time due to no suitable treatment method. It caused the flying and loss of valuable metals, and some of them were incinerated. The incineration slag was granulated and incorporated into the alloy converter for treatment, which polluted the environment and caused the dispersion loss of rare and precious metals.

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