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Process for recovering gold and silver from gold melting waste slag

A technology for recovering gold and waste slag, which is applied in the field of recovering gold and silver, which can solve problems such as poor results, and achieve the effects of increasing gold and silver leaching rate, reducing leaching time, and reducing production costs

Inactive Publication Date: 2015-07-29
张博文 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, almost all the resources in the waste slag of the gold smelting industry are discarded as waste or sent to cement plants. A few try to recover gold and silver after natural oxidation, but the results are not good.

Method used

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Embodiment 1

[0015] A process for recovering gold and silver from gold smelting waste residue, the steps are as follows:

[0016] Send 100t waste residue with grade Au1.73g / t, Ag55.39g / t (mass fraction is 70wt%) to ball mill for fine grinding, fineness -400 is 94%, add 3.5kg / t protective base (protective base is composed of sodium hydroxide : Sodium carbonate is composed according to the mass ratio of 2:1) to adjust the pH=10-10.5, classify through the cyclone, and return the large particles to the ball mill in the bottom flow; The concentration (solid-liquid mass ratio) is controlled at 39% and sent to the leaching tank, adding a cosolvent (the cosolvent is composed of lead nitrate and sodium chloride in a mass ratio of 5:1) 330g / t waste residue (dry weight) and sodium cyanide 1.5 kg / t waste residue (dry weight), leaching for 48 hours, at the last 20-24 hours from the end of leaching, reversely add activated carbon for carbon adsorption (activated carbon density 10-20g / L, carbon wear rate...

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Abstract

The invention provides a process for recovering gold and silver from gold melting waste slag, and belongs to the technical field of gold melting waste slag recovery. The method comprises the following steps that (1) gold melting waste slag is finely ground; (2) water is added for slurry preparation, protection alkali is added for regulating the pH to be 10 to 10.5, solvents and sodium cyanide are added, leaching is carried out for 40 to 48 hours, active cabin is added in the last 20 to 24 hours before the leaching completion, active carbon adsorption is carried out during the leaching, the gold and the silver are enriched in the active carbon, and the gold and the silver are respectively obtained and recovered through conventional separation, electrolysis and melting. The protection alkali can favorably realize the pH stabilized at 10 to 10.5 in the leaching process, the gold and silver leaching rate can be improved, and simultaneously, the production cost can be reduced; Pb<+> in cosolvents can damage passivation films of the gold, and the coating on the gold and the silver of limonite and cuprous oxide generated by calcination and silicates in raw ore is eliminated, the dissolution speed of the gold and the silver is accelerated, the leaching time is reduced, and the leaching rate of the gold and the silver is improved.

Description

technical field [0001] The invention belongs to the field of gold smelting waste residue treatment, in particular to a process for recovering gold and silver from gold smelting waste residue. Background technique [0002] The roasting pretreatment process is currently the most popular process for processing complex gold fine powder, which was invented by the Swedish Boliden company in the 1880s. In the early 1890s, China National Gold established the first fine gold powder roasting pretreatment production line in Sanmenxia, ​​Henan. Since then, it has achieved long-term development in my country. There are six large and small enterprises in Sanmenxia alone, with a daily processing capacity of about 3,000 tons. Due to the limitations of the industry, the tailings of each enterprise are 1.7-1.8g / t for gold and 40-65g / t for silver. With the change of the nature of the ore source, the tailings are even higher. In the face of increasingly depleted mine resources, increasing raw m...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 张博文南君方李耀辉
Owner 张博文