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Method for treating precious metal iron trapped material

A precious metal and aggregate technology, which is applied in the processing field of precious metal iron catching materials, can solve the problems of unfriendly environment, reduced comprehensive recovery rate of precious metals, increased processing cost, etc., and achieves improved comprehensive recovery rate, high industrial application value, reduced Process cost effect

Pending Publication Date: 2021-08-20
GUIYAN RESOURCE YIMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the acid-dissolving and iron-removing process is mainly used to enrich precious metals. Due to the influence of factors such as capture technology, smelting equipment, and process condition control in the pyro-smelting enrichment process, the physical and chemical properties, structural form, and content of the formed precious metal iron capture The composition is complex and diverse, the enrichment rate of precious metals is only 60-80%, and some precious metals are dispersed into the solution, the amount of dissolved liquid is large, and the content of precious metals is low. It is difficult to recover the precious metals dispersed into the solution, resulting in a decrease in the comprehensive recovery rate of precious metals
In addition, the acid-dissolved iron removal waste liquid produces a large amount, which increases the treatment cost and is not friendly to the environment

Method used

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  • Method for treating precious metal iron trapped material

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Experimental program
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Effect test

Embodiment 1

[0037] A kind of method for processing precious metal iron catch material, carry out successively according to following steps:

[0038] A. Mixing: automatically grinding and mixing 500 g of the precious metal iron capture material with a particle size of 100 mesh and 25 g of pure sodium chloride for solid state analysis to obtain a mixed material;

[0039] B. Drying: place the mixed material obtained in step A in a muffle furnace for 24 hours at 30°C to obtain a dried material;

[0040] C. Chlorination: pass the dried material obtained in step B into Cl under the high temperature condition of 1200°C 2 / CO mixed gas chlorination, Cl 2 / CO mixed gas Cl 2 The volume ratio to CO is 1:0.1, and the chlorination time is 0.5h to obtain ferric chloride flue gas and precious metal chlorination enrichment, and the FeCl generated during the chlorination reaction process 3 The flue gas is condensed to obtain solid FeCl 3 ·6H 2 O; the chlorinated tail gas is discharged after being abs...

Embodiment 2

[0044] A kind of method for processing precious metal iron catch material, carry out successively according to following steps:

[0045] A. Mixing: 500 g of the precious metal iron capture material with a particle size of 100 mesh and 50 g of solid analysis pure potassium chloride are manually ground, stirred and mixed evenly to obtain a mixed material;

[0046] B. Drying: place the mixed material obtained in step A in a muffle furnace for 16 hours at 50°C to obtain a dried material;

[0047] C. Chlorination: pass the dried material obtained in step B into Cl under the high temperature condition of 1100°C 2 / CO mixed gas chlorination, Cl 2 / CO mixed gas Cl 2 The volume ratio to CO is 1:0.5, and the chlorination time is 4h to obtain ferric chloride flue gas and noble metal chlorination enrichment, and the FeCl generated in the chlorination reaction process 3 The flue gas is condensed to obtain solid FeCl 3 ·6H 2 O; the chlorinated tail gas is discharged after being absorbe...

Embodiment 3

[0051] A kind of method for processing precious metal iron catch material, carry out successively according to following steps:

[0052] A. Mixing: 500g of the precious metal iron capture material with a particle size of 100 mesh is automatically ground and mixed with 40g of solid analysis pure sodium chloride and 40g of solid potassium chloride to obtain a mixed material;

[0053] B. Drying: place the mixed material obtained in step A in a muffle furnace for 12 hours at 70°C to obtain a dried material;

[0054] C. Chlorination: pass the dried material obtained in step B into Cl under the high temperature condition of 1000°C 2 / CO mixed gas chlorination, Cl 2 / CO mixed gas Cl 2 The volume ratio to CO is 1:1, and the chlorination time is 6h, to obtain ferric chloride flue gas and noble metal chlorination enrichment, and the FeCl generated in the chlorination reaction process 3 The flue gas is condensed to obtain solid FeCl 3 ·6H 2 O; the chlorinated tail gas is discharged ...

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Abstract

The invention relates to the field of recycling of precious metal secondary resources, in particular to a method for treating a precious metal iron trapped material. The method comprises the following steps of uniformly mixing the precious metal iron trapped material and chloride, drying the same, then introducing Cl<2> / CO mixed gas for chlorination, performing a reaction to generate FeCl<3> flue gas, so as to separate iron from precious metal, absorbing chlorinated tail gas by alkali liquor, and then discharging; condensing the FeCl<3> flue gas to obtain a solid ferric trichloride hydrate, adding alkali for hydrolysis after dissolution to generate ferric hydroxide, calcining the ferric hydroxide to generate ferric oxide, and returning the ferric oxide to a smelting enrichment process to serve as a trapping agent, so that cyclic utilization of the trapping agent is realized; and cooling and then dissolving a chlorinated enriched product separated from the FeCl<3> flue gas to obtain a solution containing precious metal, and transferring the same to a subsequent refining process. The method can efficiently enrich the precious metal from the precious metal iron trapped material, the enrichment rate reaches 90% or above, and the method has the characteristics of recycling the iron trapped material and a short process, is beneficial to energy conservation and environmental protection, and has the high industrial popularization value.

Description

technical field [0001] The invention relates to the field of recovery and utilization of precious metal secondary resources, in particular to a treatment method for precious metal iron collectors. Background technique [0002] Expired automobile exhaust purification catalyst (containing platinum, palladium, rhodium) and insoluble α-Al 2 o 3 The recovery of precious metals in secondary resource materials such as matrix chemical catalysts (including platinum and palladium) is difficult due to wet treatment, low metal recovery rate, and serious environmental pollution. Pyro-smelting iron capture technology is generally used at home and abroad to enrich and obtain Precious metal-containing ferroalloy enrichment, and then carry out precious metal separation, purification and deep processing. The main component of precious metal ferroalloy materials is iron, and prior to precious metal refining and purification, iron needs to be removed first to further enrich platinum group met...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/08C22B11/02C01G49/06
CPCC22B7/002C22B1/08C22B11/026C01G49/06Y02P10/20
Inventor 吴喜龙赵雨李勇王欢刘文王彪宁显雄陈明军姚艳波
Owner GUIYAN RESOURCE YIMEN