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Pretreatment method of precious metal-containing iron alloy

A ferroalloy and precious metal technology, applied in the field of comprehensive utilization of precious metal secondary resources, can solve the problems of difficult acid-dissolving iron removal and high precious metal content, and achieve the effects of high silicon removal rate, short leaching time, and easy acid-dissolving iron removal.

Inactive Publication Date: 2021-03-16
GUIYAN RESOURCE YIMEN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and propose a pretreatment method for ferroalloys containing precious metals, which uses heating and pressurization to leaching silicon in ferroalloys to solve the problem of ferroalloys containing precious metals being difficult to remove iron by acid dissolution The problem is that the process is simple, the silicon removal rate is high, the iron removal rate is high, and the precious metal content in the precious metal-containing enrichment material becomes higher

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  • Pretreatment method of precious metal-containing iron alloy

Examples

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Effect test

Embodiment 1

[0026] A pretreatment method for precious metal-containing ferroalloys, which is carried out sequentially as follows:

[0027] A. Milling: Grinding the ferroalloy containing precious metals with a ball mill to a powder material with a particle size of 30 mesh;

[0028] B. Pressurized alkaline leaching: Add 200 g of the precious metal-containing ferroalloy powder obtained in step A into 69 g of NaOH. After NaOH and the precious metal-containing ferroalloy powder are prepared, add 331 ml of water to mix the slurry, stir in a 3L autoclave and heat to 105 ℃, reaction pressure 0.1Mp, constant temperature reaction 0.5h;

[0029] C. Liquid-solid separation: filter the material liquid after the pressurized alkaline leaching reaction in step B to obtain silicon-containing leaching solution and alkaline leaching residue; dry the alkaline leaching residue and take samples to analyze the silicon content, and use the silicon content before and after pretreatment to calculate Obtaining the...

Embodiment 2

[0033] A pretreatment method for precious metal-containing ferroalloys, which is carried out sequentially as follows:

[0034] A. Milling: Grinding the ferroalloy containing precious metals with a ball mill to a powder material with a particle size of 100 mesh;

[0035] B. Pressurized alkaline leaching: Add 200 g of the precious metal-containing ferroalloy powder obtained in step A into 96 g of KOH. After KOH and the precious metal-containing ferroalloy powder are prepared, add 904 ml of water to adjust the slurry, stir in a 3L autoclave and heat to 150 ℃, reaction pressure 1.0Mp, constant temperature reaction 2h;

[0036] C. Liquid-solid separation: filter the material liquid after the pressurized alkaline leaching reaction in step B to obtain silicon-containing leaching solution and alkaline leaching residue; dry the alkaline leaching residue and take samples to analyze the silicon content, and use the silicon content before and after pretreatment to calculate Obtaining the...

Embodiment 3

[0040] A pretreatment method for precious metal-containing ferroalloys, which is carried out sequentially as follows:

[0041] A. Powder making: atomize and spray the ferroalloy containing precious metals to a powder material with a particle size of 200 mesh;

[0042] B. Pressurized alkaline leaching: Add 200 g of the precious metal-containing ferroalloy powder obtained in step A into 138 g of NaOH. After NaOH and the precious metal-containing ferroalloy powder are prepared, add 1862 ml of water to mix the slurry, and stir in a 3L autoclave and heat to 220 ℃, reaction pressure 3.0Mp, constant temperature reaction 6h;

[0043] C. Liquid-solid separation: filter the material liquid after the pressurized alkaline leaching reaction in step B to obtain silicon-containing leaching solution and alkaline leaching residue; dry the alkaline leaching residue and take samples to analyze the silicon content, and use the silicon content before and after pretreatment to calculate Obtaining ...

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Abstract

The invention relates to the field of comprehensive utilization of precious metal secondary resources, in particular to a pretreatment method of a precious metal-containing iron alloy. The pretreatment method of the precious metal-containing iron alloy sequentially comprises the following steps: A, pulverizing, B, conducting pressure alkaline leaching, C, carrying out liquid-solid separation, D, removing iron by acid dissolution, and E, performing liquid-solid separation. In the step A, the precious metal-containing iron alloy is processed into powder with the particle size of 30-300 meshes; in the step B, alkali is added into ferroalloy powder containing precious metal obtained in the step A, heating is conducted, and silicon in the alloy is subjected to pressure leaching; In the step C,feed liquid is cooled and filtered after the pressurized alkaline leaching reaction in the step B to obtain a silicon-containing leachate and alkaline leaching residues; in the step D, hydrochloric acid is added into the alkaline leaching residues obtained in the step C, and then water is added to enable the liquid-solid ratio to be 10: 1 so to be dissolved for 4 hours at normal temperature; and in the step E, the feed liquid is filtered after the acid dissolution iron removal reaction in the step D to obtain an iron-containing leachate and a precious metal-containing enriched material. According to the pretreatment method, the process is simple, the silicon removal rate is high, the iron removal rate is high, and the precious metal content in the precious metal-containing enriched material is increased.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of secondary resources of precious metals, in particular to a pretreatment method for ferroalloys containing precious metals. Background technique [0002] Due to the excellent chemical catalytic activity of precious metals, they are widely used in the industrial catalysis industry. However, my country is a country poor in platinum group metal resources, with only 340 tons of mineral resource reserves, and only about 3 tons of platinum group metals per year. The volume is more than 120 tons, which is largely dependent on imports. At the same time, my country is a large automobile production country. The amount of platinum group metals used in automobile exhaust purification systems is nearly 100 tons per year, with an output value of more than 30 billion yuan. Therefore, the removal of precious metals from exhausted automobile exhaust catalysts has good economic, social and environmental be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/00C22B11/00C22B3/12C22B3/10
CPCC22B7/009C22B1/005C22B7/008C22B7/007C22B11/048Y02P10/20
Inventor 李勇王欢杨泉赵雨吴喜龙刘文肖雄宁显雄鲁俊余姚宇陈明军姚艳波
Owner GUIYAN RESOURCE YIMEN
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