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Method for extracting heavy metals through adopting iron-based material as capturing agent

A technology for iron-based materials and precious metals, which is applied in photographic processes, instruments, photographic auxiliary processes, etc., can solve the problems of large metallurgical waste discharge, low precious metal extraction rate, heavy metal pollution, etc., and achieves high precious metal extraction rate and slag phase flow. Good sex, easy separation effect

Active Publication Date: 2017-05-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems of heavy metal pollution, high material consumption and energy consumption, large discharge of metallurgical waste and low extraction rate of precious metals in the extraction of precious metals, the present invention proposes a method for extracting precious metals with a green collector

Method used

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  • Method for extracting heavy metals through adopting iron-based material as capturing agent

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Embodiment 1

[0039] Mix 100 parts of gold concentrate, 30 parts of iron powder, 10 parts of graphite powder and 10 parts of calcium oxide in proportion to obtain a mixture. The mixture is melted in an induction furnace at a melting temperature of 1600°C and a melting time of 0.5h. After smelting, slag and iron are separated to obtain iron-based alloys rich in precious metals and smelting slag. The iron-based alloy is used as the anode, and the iron plate is used as the cathode for electrolysis to realize the separation of precious metals and base metals, and the precious metals are further enriched to obtain precious metal enrichment. The electrolysis process parameters are: the current density is 1.0A / dm 2 , the electrolyte pH is 4.0, Fe 2+ The ion concentration is 20g / L, and the electrolysis temperature is 25°C. Sodium hydroxide is added to the electrolysis tail liquid to adjust the pH of the solution, precipitate step by step and recover the base metal. The precious metal enrichment...

Embodiment 2

[0041] Mix 100 parts of gold concentrate, 40 parts of magnetite, 20 parts of carbon powder, 3 parts of sodium carbonate, and 10 parts of calcium oxide according to the proportion. The mixture was melted in an induction furnace at a melting temperature of 1500°C and a melting time of 2 hours. After smelting, slag and iron are separated to obtain iron-based alloys rich in precious metals and smelting slag. The iron-based alloy is hydrolyzed with sulfuric acid to further enrich precious metals to obtain precious metal enrichment. The hydrogen ion concentration of the acid hydrolyzed solution is 0.1mol / L, and the dissolution temperature is 25°C. After the iron-based alloy is completely dissolved, filter, add sodium hydroxide to the filtrate to adjust the pH of the solution, precipitate step by step and recover the base metal. The precious metal enrichment is purified to obtain precious metals. After testing, the extraction rate of precious metals reaches 99.1%. The whole process...

Embodiment 3

[0043] Mix 100 parts of platinum group concentrate, 25 parts of limonite, 14 parts of graphite powder, 3 parts of borax, 10 parts of calcium oxide, and 5 parts of alumina according to the proportioning ratio. The mixture was melted in an induction furnace at a melting temperature of 1600°C and a melting time of 2 hours. After smelting, slag and iron are separated to obtain iron-based alloys rich in precious metals and smelting slag. The iron-based alloy is used as the anode, and the stainless steel plate is used as the cathode to electrolyze to realize the separation of precious metals and base metals, and the precious metals are further enriched to obtain precious metal enrichment. The electrolysis process parameters are: the current density is 3.0A / dm 2 , the electrolyte pH is 3.8, Fe 2+ The ion concentration is 25g / L, and the electrolysis temperature is 28°C. Sodium hydroxide is added to the electrolysis tail liquid to adjust the pH of the solution, precipitate step by s...

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Abstract

The invention relates to a method for extracting heavy metals through adopting an iron-based material as a capturing agent, and belongs to the technical field of heavy metal extraction. The method is characterized in that the iron-based material is adopted as the capturing agent, the capturing agent, a heavy metal material, a reducing agent and a slag former are matched and mixed, a mixture is smelted, an iron-base alloy rich in heavy metals is obtained through slag-iron separation, and then, the heavy metals are further enriched through electrolysis or acidolysis. The method has the advantages that a heavy metal lead capturing agent is eliminated, heavy metal pollution is avoided, the raw material adaptability is high, the heavy metal extracting rate is high, material and energy consumption is low, the cost is low, and the like, and the method is applicable to industrial production; and besides, high-temperature reduction smelting is adopted, the fluidity of slag phases is good, the slag phases and metal phases are easily separated, and the heavy metal extracting rate is high.

Description

technical field [0001] The invention belongs to the field of precious metal extraction, and relates to a method for extracting precious metals by using iron-based materials as collectors. Background technique [0002] Precious metals mainly refer to gold, silver and platinum group metals (ruthenium, rhodium, palladium, osmium, iridium, platinum) 8 metal elements, which are widely used in aerospace, military industry, electronic appliances, transportation, petrochemical and other modern technology and industrial fields , has important strategic significance and is known as "the vitamin of modern industry". [0003] Precious metals are mainly produced in South Africa, the United States, Canada, Russia, Australia and other countries, especially platinum group metals. The reserves of these countries account for about 99% of the world's reserves. my country's reserves of precious metals are scarce, and the reserves of platinum group metals are less than 400 tons. The annual outp...

Claims

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Application Information

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IPC IPC(8): C22B11/02C25C1/20
CPCC22B11/02C25C1/20
Inventor 张深根丁云集刘波
Owner UNIV OF SCI & TECH BEIJING