Process for recovering gold from solid waste

Abstract

The invention discloses a process for recovering gold from a solid waste. The process includes the steps of first, the solid waste is placed in a carbonization furnace for burning and a material is obtained after the burning; after being measured, the material is put into a ball mill to be ground so as to obtain a granular material; then, the granular material is fed to a mixer for mixing and thenconveyed to a vibrating sieve for sieving to obtain a powder; the powder is put into a reaction kettle, steam is fed and aqua regia is added for acid pickling to obtain a paste; the paste is fed to apressure filter for pressure filtration to obtain a gold-containing liquid and residue respectively; the gold-containing liquid is fed into a gold-precipitating bucket, a reductant is added and stirring is performed for reduction, and filtering is performed by using a filter cone to obtain gold powder and waste water; and the gold powder is baked dry and ingot melting is performed to obtain goldingots. Before the dissolution by the aqua regia, the granular material is firstly fed to the mixer for mixing to make the granular material more homogeneous, then screened through the vibrating sieveto select the powder of appropriate size and finally subjected to subsequent dissolution and reduction, so as to make the subsequent acidification and reduction more thorough and complete. Therefore,the gold recovery rate is effectively increased.

Description

technical field [0001] The invention relates to the field of precious metal recovery, more specifically, it relates to a gold recovery process in solid waste. Background technique [0002] With the continuous development of society, precious metal jewelry such as gold and silver are more and more popular among the public, and in the process of precious metal jewelry processing, there will be a lot of solid waste such as scraps and scraps, and these fixed wastes have a lot of precious metal content. , if it is directly discarded, it will cause a lot of waste, especially the gold in it is very precious, so many existing solid wastes are extracted and recycled through the recovery process of gold and other precious metals, reducing waste can also reduce the cost of enterprises burden. [0003] Most of the gold recovery methods in the prior art are to incinerate solid waste first, then grind it into powder and then dissolve it in aqua regia to extract it. However, due to the un...

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Problems solved by technology

[0003] Most of the gold recovery methods in the prior art are to incinerate solid waste first, then grind it into powder and then dissolve it in aqua regia to extract it. However, due to the uneven size of the ground particles and the uniformity Poor, which will greatly affect the comprehensiveness and thoroughness of subsequent aqua regia dissolution method extraction, resulting in a low recovery rate of gold in solid waste, which needs further improvement

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