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Method for enriching and recycling bismuth from waste acid sulfide residues

A technology of sulfide slag and dirty acid, which is applied in the interdisciplinary fields of metallurgical engineering and environmental engineering, can solve the problems of waste of bismuth resources, achieve efficient recovery, reduce treatment costs and environmental risks, and reduce energy consumption

Active Publication Date: 2016-05-11
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a low-energy, low-cost, high-efficiency polluted acid sulfide slag for the waste of bismuth resources and environmental pollution caused by the accumulation or landfill of the dirty acid sulfide slag produced in the purification process of the dirty acid sulfide method. Method for the enrichment and recovery of bismuth in

Method used

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  • Method for enriching and recycling bismuth from waste acid sulfide residues

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Embodiment 1

[0023] Take 500ml of electrolyte solution from a copper smelter, add polluted acid sulfide slag with bismuth content of 0.12% according to the ratio of As / Cu molar ratio 2, stir and mix well, react at 70°C for 3h, filter to obtain bismuth-rich filtrate, in the solution The concentration of bismuth increased from 0.43g / L to 1.22g / L, achieving the purpose of enriching bismuth. Evaporate and concentrate the bismuth-rich filtrate to a sulfuric acid concentration of 900g / L, cool and crystallize at 25°C for 2 hours, filter to obtain arsenic oxide and bismuth oxide mixture containing 1.8% bismuth, add sulfuric acid to the mixture at a solid-to-liquid mass ratio of 2:1 and sodium chloride solution, wherein the concentration of sulfuric acid is 5mol / L, the concentration of chloride ion is 2mol / L, leaching at 50°C for 2h, after the leaching is completed, the bismuth-rich leaching solution with a bismuth concentration of 5.6g / L is filtered, and poured into the bismuth-rich leaching soluti...

Embodiment 2

[0025] Take 500mL of copper electrolyte and add the polluted acid sulfide slag with a bismuth content of 0.14% according to the ratio of As / Cu molar ratio of 1.5, stir and mix well, react at 80°C for 2h, filter to obtain a bismuth-rich filtrate, and the concentration of bismuth in the solution is given by 0.43g / L rose to 1.75g / L, achieving the purpose of enriching bismuth. Evaporate and concentrate the bismuth-rich filtrate to a sulfuric acid concentration of 800g / L, cool and crystallize at 20°C for 3 hours, filter to obtain arsenic oxide and bismuth oxide mixture containing 2.1% bismuth, add sulfuric acid to the mixture at a solid-to-liquid mass ratio of 3:1 And sodium chloride solution, wherein the concentration of sulfuric acid is 4mol / L, the concentration of chloride ion is 3mol / L, leaching at 60°C for 1h, after the leaching is completed, the bismuth-rich leachate with a bismuth concentration of 7.8g / L is filtered, and poured into the bismuth-rich leachate Sodium hydroxide...

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Abstract

The invention discloses a method for enriching and recycling bismuth from waste acid sulfide residues. The method comprises the following steps: 1) adding the waste acid sulfide residues into copper electrolyte, controlling reaction conditions, introducing bismuth and arsenic in the waste acid sulfide residues into a solution, replacing and enriching sulfides in copper waste acid sulfide residues in electrolyte to obtain copper sulfide residues; 2) evaporating and concentrating the solution which is rich in bismuth and arsenic in step 1), and separating out a mixture of bismuth oxide and arsenic oxide from the solution by crystallizing the solution after cooling the solution; 3) adding sodium chloride into sulfuric acid to selectively leach bismuth in the mixture of the bismuth oxide and the arsenic oxide, and filtering the mixture to bismuth-rich leaching liquor; and 4) regulating the pH value of the bismuth-rich leaching liquor for neutralizing and hydrating the bismuth-rich leaching liquor to generate bismuth chloride oxide precipitates, standing the bismuth chloride oxide precipitates for certain time, filtering the bismuth chloride oxide precipitates to obtain bismuth chloride oxide and tail liquor, and returning the tail liquor into a solution which is rich in bismuth and arsenic in the step 1) for circulating. The method not only can realize recycling waste acid sulfide residues in a smelting system, but also efficiently enriches and recycles the bismuth, and has a relatively high practical value.

Description

technical field [0001] The invention belongs to the cross field of metallurgical engineering and environmental engineering, and relates to a method for enriching and recovering bismuth in polluted acid sulfide slag obtained by sulfidation treatment. Background technique [0002] Bismuth is recognized as one of the safest "green" metals in the world today, and has been widely used in the fields of medicine, semiconductors, superconductors, flame retardants, pigments, cosmetics, chemical reagents, electronic ceramics, metallurgical additives, fusible alloys, etc. There is a tendency to replace toxic metals such as lead, antimony, cadmium, and mercury. Bismuth has very little stock in nature, its abundance is comparable to that of silver, and most of it is symbiotic with copper, lead and tungsten deposits. Copper concentrate is an important source of bismuth resources. During the smelting process, part of the bismuth associated with the copper concentrate enters the dirty acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B30/06C22B7/04
CPCC22B7/006C22B7/04C22B30/06Y02P10/20
Inventor 王庆伟柴立元蒋国民胡明史美清李青竹杨志辉高伟荣
Owner CENT SOUTH UNIV
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