Method of recovering valuable metal in waste lining brick of gold silver smelting furnace

Abstract

A method to recover valuable metal from abandoned bricks by lines of gold and silver smelting, whose craft steps are as follows: de-magging from extraction of sulfuric acid, deprivation of lead sulfate etching by alkali, silver etching by nitric acid and gold etching by aqua regia. The process of de-magging from extraction of sulfuric acid is that: 200kg bricks powder of abandoned magnesia-chrome from lines of gold and silver smelting is stirred with 1350kg dilute sulfuric acid. The mixture reacts for 2 to 3 hours, and discharges clear MgSO4 strong solution. 100kg water is filled into extraction slot. Based on stirring, 25ppm flocculant is added and stewed for 10 minutes. After discharging MgSO4 solution, 1000kg is filled into extraction slot and filtrated to get MgSO4 wet materials. Then, it is neutralized with light-burned magnesia to achieve magnesium sulphate. Valuable metals including magnesium, lead, silver, gold and copper etc. can be recovered from abandoned bricks by lines of gold and silver smelting. Deposits including Cr(OH)3, Fe(OH)3, Cu(OH)2 and Al(OH)3 can be gathered for producing refractory materials, which realizes salvaging and reduces environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy, and in particular relates to a method for recovering various valuable metals from waste bricks used in gold and silver smelting furnace linings by adopting a wet process. Background technique [0002] So far, gold and silver fire production is still one of the main processes of gold and silver smelting. Copper smelters mostly adopt the pyrotechnic process of "copper matte smelting-blowing-refining". The copper anode slime produced is subjected to sulfate roasting, selenium removal and copper removal, and then gold and silver smelting to obtain gold and silver alloys. Gold and silver smelting is carried out in small gold and silver smelting converters. Due to the bonding of furnace materials and the penetration of molten metal, valuable metals such as gold, silver, copper, and lead are mixed in the masonry of the small gold and silver smelting converter. During the regular maintena...

AI Technical Summary

Problems solved by technology

Another major problem is that although 96% of the precious metals have been enriched through re-election and flotation, 4% of the precious metals remain in the flotation tailings. Compared with ordinary precious metal mines, the flotation tailings Gold and silver grades remain high

The disadvantage of this method is that the process is more complicated, the time required for carbonate conversion is long, and the PbCl is entrained in the silver chloride precipitation. 2 and Pb(NO 3 ) 2 more difficult to purify