Technological method for extracting antimony and bismuth from rare and noble metallurgical slag

Abstract

The invention discloses a technological method for extracting antimony and bismuth from rare and noble metallurgical slag. The technological method comprises the following steps: (1) performing leaching: adding rare and noble metallurgical slag gold concentrates to a leaching reaction kettle, then adding an industrial sulfuric acid with the mass ratio of the gold concentrates to the sulphuric acid being 2-4:1, adding sodium chloride with the mass ratio of the gold concentrates to the sodium chloride being 0.6-1:1, leaving a solution in the leaching reaction kettle to stand, cooling the solution after standing until clarification, and then performing pressure filtration so as to obtain the leached slag and pressure filtration solutions, on which slag removal and separation are performed; (2) separating antimony so as to obtain antimonous oxychloride and an antimony precipitation solution; (3) separating bismuth so as to obtain bismuth oxide chloride. The technological method disclosed by the invention has the benefits that under the premise that the recovery of noble metals, such as gold and silver, is ensured not to be influenced, firstly, valuable elements of antimony and bismuth are separated from the gold concentrates, on one hand, antimony resources and bismuth resources are recovered, and the benefit is promoted; on the other hand, a favorable raw material condition is created for the subsequent recovery of gold, silver and the like through smelting.

Description

technical field [0001] The invention relates to a rare and precious metal purification treatment process, in particular to a process for extracting antimony and bismuth from rare and precious metal smelting slag. Background technique [0002] After various rare and precious metal raw materials are smelted at a high temperature of about 1000~1200°C, precious metals and corresponding smelting slags are produced. The smelting slag contains a small amount of gold, silver and a large amount of valuable elements such as antimony and bismuth mixed in multivalent states. Usually, this part of the smelting slag is directly returned to the copper and lead smelting system or the gold concentrate after flotation is returned to the gold and silver collection system, only the main elements of gold and silver are recovered, and the antimony and bismuth elements cannot be recovered. The main elements of gold and silver are recovered by direct smelting. Due to the high content of antimony an...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the existing recycling of rare and precious metal smelting slag only recovers gold and silver elements, resulting in products containing a large amount of antimony and bismuth elements that cannot be recycled, product quality declines, energy consumption increases, and valuable resources such as antimony and bismuth are wasted , to provide a process for extracting antimony and bismuth from rare and precious metal smelting slag gold concentrate