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Method for enriching precious metal in electric furnace material

A precious metal and material technology, applied in the field of precious metal metallurgy, can solve the problems of difficult removal of impurity zinc and magnesium, difficulty in recovery, long extraction process of rhodium and iridium, etc., to achieve high-efficiency separation, simple process flow, and the effect of inhibiting trace leaching

Pending Publication Date: 2022-07-26
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process has the following problems: (1) The precious metals in the dilute acid leaching solution of about 0.X-0.0Xg / L are difficult to recover due to the interference of impurity iron; (2) The copper powder replacement process will introduce Impurity copper interferes with the subsequent separation and refining of precious metals; (3) Although the replacement of rhodium and iridium by zinc and magnesium powder can achieve the enrichment of rhodium and iridium, it is difficult to remove impurity zinc and magnesium, and the extraction process of rhodium and iridium is long

Method used

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  • Method for enriching precious metal in electric furnace material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0017] (1) Smelting and capturing 100g of iron-precious metal alloys produced during the precious metal smelting process in an electric arc furnace (the total content of precious metals is 2.2%), leaching with a volume fraction of 5% hydrochloric acid solution at 5°C for 8 hours, and adding 1g hydrochloric acid to the hydrochloric acid solution Hydroxylamine, leaching and filtering to obtain filter residue, the precious metal content in the filtrate is all ≤0.0005g / L, and the filtrate enters the wastewater treatment station for treatment;

[0018] (2) Dissolving the filter residue obtained in step (1) to make a solution, controlling the pH of the solution to be 0, adding vitamin C twice the mass of gold, silver, platinum and palladium in the solution, and reacting at 60 ° C for 1 hour and filtering, the gold and silver in the filter residue are filtered. The platinum and palladium (total content is 40.26%) are separated and refined;

[0019] (3) The filtrate obtained in step (...

Embodiment 2

[0021] (1) 1000g electric arc furnace smelting and capturing the iron-precious metal alloy produced in the precious metal smelting process (the total content of precious metals is 1.3%), and leaching with a volume fraction of 15% hydrochloric acid solution at 95°C for 12 hours, wherein hydroxylamine hydrochloride in the hydrochloric acid solution 50g, filter after leaching to obtain filter residue, the precious metal content in the filtrate is all ≤0.0002g / L, and the filtrate enters the wastewater treatment station for treatment;

[0022] (2) Dissolving the filter residue obtained in step (1) to make a solution, controlling the pH of the solution to be 2, adding vitamin C 5 times the mass of gold, silver, platinum and palladium in the solution, and reacting at 65 ° C for 2 hours and filtering, the gold and silver in the filter residue Platinum and palladium (total content of 35.07%) are separated and refined;

[0023] (3) The filtrate obtained in step (2) is heated to 90°C, so...

Embodiment 3

[0025] (1) Smelting and capturing 100kg of iron-precious metal alloys produced during the precious metal smelting process in an electric arc furnace (the total content of precious metals is 1.08%), and leaching with a volume fraction of 10% hydrochloric acid solution at 80°C for 10 hours, in which 1kg of hydroxylamine hydrochloride is contained in the hydrochloric acid solution. , leaching and filtering to obtain filter residue, the precious metal content in the filtrate is all ≤0.0008g / L, and the filtrate enters the wastewater treatment station for treatment;

[0026] (2) Dissolving the filter residue obtained in step (1) to make a solution, controlling the pH of the solution to be 1, adding vitamin C three times the mass of gold, silver, platinum and palladium in the solution, and reacting at 62 ° C for 1.5 hours and filtering, the gold and silver in the filter residue Platinum and palladium (total content is 32.11%) are separated and refined;

[0027] (3) The filtrate is he...

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Abstract

The invention discloses a method for enriching precious metal, and particularly relates to a method for enriching precious metal in an electric furnace material. The method specifically comprises the following steps that (1) a hydrochloric acid solution with the volume fraction of 5%-15% is used for leaching an electric furnace material for 8-12 hours at the temperature of 55-95 DEG C, hydroxylamine hydrochloride accounting for 1%-5% of the mass of the material needs to be added into the hydrochloric acid solution, and filtering is conducted after leaching; (2) dissolving the filter residues to prepare a solution, controlling the pH value of the dissolving solution to be 0-2, adding vitamin C which is 2-5 times of the mass of gold, silver, platinum and palladium in the solution, reacting at 60-65 DEG C for 1-2 hours, filtering, and separating and refining gold, silver, platinum and palladium in the filter residues; and (3) heating the filtrate to 70-90 DEG C, adding sodium hydroxide or potassium hydroxide to adjust the pH value to be greater than or equal to 14, introducing chlorine gas into the filtrate until the pH value is 5-9 until the content of rhodium and iridium in the treated liquid is less than or equal to 0.001 g / L, filtering, discharging the filtrate, and recovering rhodium and iridium from filter residues. The method is simple in technological process and small in field operation difficulty, and the problem that the process for enriching the precious metal from the low-grade material is long is solved.

Description

technical field [0001] The invention belongs to the field of precious metal metallurgy, and in particular relates to a method for enriching precious metals in iron-precious metal alloys obtained by electric arc furnace smelting and enrichment, and is especially suitable for electric arc furnace smelting and capturing the output of self-produced low-grade precious metal materials in the precious metal smelting process iron-precious metal alloys. [0002] technical background [0003] Pyro-smelting iron capture method is one of the important recovery methods for recovering platinum group metals from spent automobile exhaust catalysts and other platinum group metal catalysts, mainly including electric arc furnace smelting and plasma furnace smelting and enrichment, both of which are suitable for low-grade precious metal materials. There are two main types of low-grade precious metal materials, one is secondary resource materials represented by waste automobile exhaust catalysts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C21B15/00
CPCC22B7/007C22B11/044C22B11/048C21B15/00
Inventor 潘从明张燕杨丽虹杨万虎杜彦君高向乾韩彬刘成
Owner JINCHUAN GROUP LIMITED
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