Method for enriching precious metal from poor impurity material

A precious metal, impurity-poor technology, applied in the field of precious metal enrichment, can solve the problems of difficult disposal of waste liquid, difficulty in removing silicon, and high value, and achieve the effect of not easily broken and speeding up the leaching reaction.

Pending Publication Date: 2022-04-15
HONGHE COLLEGE
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0002] The poor miscellaneous materials contain a variety of precious metal materials, which are of high value and are difficult to handle in terms of combination. They mainly contain metal silicon Si, ferrosilicon FeSi, metal nickel Ni, etc. The temperature is high, and the separation effect of the alloy and the slag is not good; and the precious metals in the impurity-poor materials are complete and the grade is low. Nickel exists in the form of metallic nickel, and silicon exists

Method used

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  • Method for enriching precious metal from poor impurity material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] Referring to the accompanying drawings, (1) Wet leaching of nickel: claim 2000g of poor miscellaneous material is crushed and ground, adding concentration is 20% dilute sulfuric acid and the amount is 5 times of the weight ratio of poor miscellaneous material, adding anhydrous ferric chloride in batches for leaching Nickel and iron, the total addition amount is 2.5 times of the weight ratio of the impurity-poor material, leaching at room temperature for 3 hours, filtering and washing to obtain leaching residue and leaching solution; the leaching rate of nickel in the leaching solution is 92.36%;

[0029] (2) Pyromelting desiliconization: Mix the leaching slag with nickel oxide, slagging agent, and flux. The amount of nickel oxide added is 1.0 times the weight of the leaching slag, and the amount of slagging agent lime added is 0.35 times the weight of the leaching slag. , the flux is calcium fluoride and sodium carbonate, the addition amount is 0.2 times the weight of th...

Embodiment 2

[0032] Referring to the accompanying drawings, (1) wet leaching of nickel: claim 1000g of poor miscellaneous material is crushed and finely ground, adding a concentration of 25% dilute sulfuric acid is 4 times the weight ratio of poor miscellaneous material, and then adds anhydrous ferric chloride in batches For leaching nickel, the total addition amount is 3 times of the weight ratio of the impurity-poor material, leaching at room temperature for 2 hours, filtering and washing to obtain slag and leachate; the leaching rate of nickel in the leachate is 90.25%;

[0033] (2) Pyromelting desiliconization: mix the leaching slag with nickel oxide, slagging agent, and flux, the amount of nickel oxide added is 0.8 times the weight of the leaching slag, the slagging agent is lime, and the amount of lime added is the weight of the leaching slag 0.25 times of 0.25 times, the flux is borax and calcium fluoride, the addition amount is 0.3 times of the leaching slag weight, the melting temp...

Embodiment 3

[0036]Referring to the accompanying drawings, (1) wet leaching of nickel: claim 5000g of poor miscellaneous material broken and finely ground, adding concentration is 30% dilute sulfuric acid amount is 3 times of lean miscellaneous material weight ratio, then adds anhydrous ferric trichloride in batches For leaching nickel and iron, the total addition amount is 4 times of the weight ratio of the impurity-poor material, leaching at room temperature for 4 hours, filtering and washing to obtain slag and leachate; the leaching rate of nickel in the leachate is 96.11%;

[0037] (2) Pyromelting desiliconization: mix the leaching slag with iron oxide, slagging agent, and flux, the amount of iron oxide added is 1.0 times the weight of the leaching slag, the slagging agent is lime, and the amount of lime added is leaching slag 0.3 times the weight, the flux is sodium carbonate and calcium fluoride, the addition amount is 0.2 times the weight of the leaching slag, the melting temperature...

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Abstract

The invention discloses a method for enriching precious metal from a poor impurity material, and belongs to the technical field of rare and precious metal recovery. The method comprises the following steps: firstly, adding anhydrous ferric trichloride into a poor impurity material, carrying out wet selective leaching to preferentially remove most nickel, carrying out pyrogenic smelting on leached residues, adding a slag former, a flux and iron or nickel oxide, and carrying out high-temperature smelting by taking metal silicon and silicon iron in the leached residues as natural reducing agents under the condition of high-temperature smelting, so as to obtain the high-purity nickel. The metal silicon, the silicon iron and the iron oxide are subjected to a reduction reaction, silicon oxide is generated from silicon, slagging is carried out, and meanwhile the precious metal-containing ferro-nickel alloy is obtained; the nickel-iron alloy containing the precious metal is subjected to atomization powder spraying, nickel-iron alloy powder containing the precious metal is obtained, anhydrous ferric trichloride is added to leach out metal such as nickel iron in the nickel-iron alloy powder containing the precious metal, and a precious metal enriched product and a leaching solution mainly containing ferrous chloride are obtained. The method is easy to operate, capable of achieving efficient trapping of precious metal, high in comprehensive recovery rate and enrichment ratio, environmentally friendly, low in cost, mature in main body equipment and easy to industrialize.

Description

technical field [0001] The invention belongs to the technical field of recovering rare and precious metals, and relates to a method for enriching precious metals from poor miscellaneous materials. Background technique [0002] The poor miscellaneous materials contain a variety of precious metal materials, which are of high value and are difficult to handle in terms of combination. They mainly contain metal silicon Si, ferrosilicon FeSi, metal nickel Ni, etc. The temperature is high, and the separation effect of the alloy and the slag is not good; and the precious metals in the impoverished material are complete and the grade is low. Nickel exists in the form of metallic nickel, and silicon exists in the form of metallic silicon and ferrosilicon. It is difficult to remove silicon by the full wet method. If alkali is added for leaching, the effect is not good; if hydrofluoric acid is added, silicon and ferrosilicon can be dissolved, but a large amount of waste liquid is genera...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B5/04B22F9/08C22B11/02C22B11/00C22B1/00
CPCC22B7/006C22B7/001C22B5/04B22F9/082C22B11/021C22B11/042C22B1/005Y02P10/20C22B3/08C22B3/10C22B7/007C22B7/005B22F2009/001B22F2998/10C22B3/00C22B5/00B22F1/145B22F1/147
Inventor 范兴祥黄孟阳孙丽达吴娜姜艳杨坤彬
Owner HONGHE COLLEGE
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