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A method for recovering and enriching precious metals in complex materials of low-grade precious metals

A precious metal, low-grade technology, applied in the field of rare and precious metal metallurgy, can solve the problem of reduction, achieve high enrichment multiples, avoid copper oxidation, and reduce waste copper wire consumption

Active Publication Date: 2021-11-23
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is aimed at the shortcomings of the plasma furnace iron capture method in hydrometallurgy and pyrometallurgy for processing low-grade precious metal complex materials, and provides a method for recovering and enriching precious metals in low-grade precious metal complex materials. The method flow of the invention is short , the environmental protection effect is good, the recovery rate of precious metals reaches 99%, and the total amount of precious metals in the smelting slag can be reduced to below 5g / t

Method used

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  • A method for recovering and enriching precious metals in complex materials of low-grade precious metals
  • A method for recovering and enriching precious metals in complex materials of low-grade precious metals
  • A method for recovering and enriching precious metals in complex materials of low-grade precious metals

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Experimental program
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Effect test

Embodiment 1

[0019] Take spent 5t of precious metal-containing catalysts. Referring to Table 1, the spent noble metal-containing catalysts included the following chemical compositions:

[0020] The chemical composition that the precious metal-containing catalyst of table 1 failure comprises

[0021]

[0022] Utilize a metal briquetting machine to extrude the scrap copper wire into several scrap copper wire briquettes each weighing 10kg. According to the actual content of silica, calcium oxide and alumina in Table 1, add 865kg of industrial lime, 2.44t of industrial quartz sand, 100kg of sodium carbonate, 25kg of borax, and 200kg of sulfur to the spent catalyst and mix them with water. Mix well before using The briquetting machine makes pellets, and the pellets are dried. The mass ratio of silica, calcium oxide, alumina, sodium oxide, boron oxide, and sulfur in the final pellets is 62.3:21.6:14.6:1.4:0.68:4.5. After arcing in the electric arc furnace, gradually add 180kg of waste coppe...

Embodiment 2

[0024] Take the precious metal-containing complex material after wet leaching, see Table 2, the precious metal-containing complex material includes the following chemical components:

[0025] Table 2 Chemical Composition Included in Complex Materials Containing Precious Metals

[0026]

[0027] Utilize a metal briquetting machine to extrude the scrap copper wire into several scrap copper wire briquettes each weighing 10kg. According to the actual content of silica, calcium oxide and alumina in Table 1, add 256kg of industrial lime, 0.8t of industrial quartz sand, 19.2kg of sodium carbonate, 7.32kg of borax, 50kg of sulfur and water to the spent catalyst and mix well. Finally, the pellets are made into pellets using a briquette machine, and the pellets are dried. The mass ratio of silica, calcium oxide, alumina, sodium oxide, boron oxide, and sulfur in the final pellets is 63.5:22.2:14.5:1.6:0.61:4.5 . After arcing in the electric arc furnace, gradually add 150kg of waste ...

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Abstract

The invention discloses a method for recovering and enriching precious metals in low-grade precious metal complex materials, which comprises the following steps: extruding waste copper wires into waste copper wire briquettes; mixing low-grade precious metal complex materials with lime powder, quartz sand, carbonic acid Sodium, borax, and sulfur powder are mixed with water to obtain a mixed material, and the mixed material is made into pellets and then dried; the waste copper wire briquettes are mixed with the dried pellets and then smelted to obtain smelting slag. The smelting process conditions are : The smelting temperature is 1250°C-1350°C, and the holding time is 1h-2h. After smelting and slag removal, pellets are added for further smelting and heat preservation. When the mass percentage of precious metals in molten copper is 3%-8% after smelting, the The copper water is poured out and cooled to obtain copper ingots; the copper ingots are subjected to decopper treatment and separation and purification of precious metals. The process of the invention is short, the environmental protection effect is good, the recovery rate reaches 99%, and the total amount of precious metals in the smelting slag is reduced to below 5g / t.

Description

technical field [0001] The invention belongs to the field of metallurgy of rare and precious metals, and in particular relates to a method for recovering and enriching precious metals in complex materials of low-grade precious metals. Background technique [0002] Precious metals mainly include gold, silver, platinum, palladium, rhodium, and iridium, which are rare and expensive metal resources and are widely used in aerospace, petrochemical, electronics, medicine, military, automobile and other fields. my country is a country where precious metals are relatively scarce, and needs to import more than 90% of platinum, palladium and other raw materials every year to meet the needs of social development. Therefore, secondary resource recovery of precious metals has become an important source of precious metal raw materials in my country. At present, the secondary resources of low-grade precious metals are mainly automobile exhaust catalysts, petroleum catalysts, and chemical c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
CPCC22B1/243C22B7/001C22B11/023C22B15/0056Y02P10/20
Inventor 曹杰义庞燕张燕王皓王立周文茜宋宏儒张凤娇季婷雷国强王志超
Owner JINCHUAN GROUP LIMITED
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