Method for separating and recovering arsenic from metallurgical material acid leaching liquid

A technology of separation and recovery, pickling solution, applied in the field of separation and recovery of arsenic, can solve the problems of incomplete separation of arsenic, loss of valuable metals, etc., and achieve the effect of avoiding secondary pollution

Inactive Publication Date: 2015-08-12
CENT SOUTH UNIV
View PDF2 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The reduction precipitation method uses the difference in solubility between arsenous acid and arsenic acid at the same temperature. After the arsenic solution is reduced by sulfur dioxide or sulfite, arsenic is precipitated out. The product obtained by this method is highly toxic arsenous acid. Although The solubility of arsenous acid is lower than that of arsenic acid, but the solubility of arsenous acid at room temperature is still about 20g / L, and the separation of arsenic by reduction precipitation method is not complete
[0006] The ion exchange or solvent extraction of arsenic is usually required to be carried out under a specific pH condition, and most hydrometallurgical processes will cause a large amount of valuable metal loss under this pH condition

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 3m sulfuric acid leaching solution of copper smelting converter white smoke 3 , add Sb according to the molar ratio of As and Sb(III) in the solution 1:2.5 2 o 3 , and add hydrated Sb according to Sb(V) / Sb(III) molar ratio 1:3 2 o 5 , stirred at 75°C for 1h, cooled to 45°C and filtered to obtain the loaded adsorbent and dearsenic solution. The liquid after arsenic removal is used to recover other valuable metals; the loaded adsorbent is mixed with water at a solid-to-liquid ratio of 1:2g / ml, firstly add sodium hydroxide to adjust the pH to 9.5, then add sodium carbonate to adjust the pH to 11.5, and stir at 80°C for 1.5 h. Filtrate and wash while hot to obtain the regenerated adsorbent and desorbed liquid. After desorption, the liquid is blown to oxidize first, then cooled and crystallized to precipitate Na 2 HASO 4 12H 2 O, filtered to obtain disodium hydrogen arsenate and its crystallization mother liquor. Disodium hydrogen arsenate is dried and sold as a...

Embodiment 2

[0035] Take 3 L of nitric acid leaching solution of copper-nickel metallurgical materials, add the regenerated adsorbent obtained in Example 1 according to the molar ratio of Sb(III) / As of 3.5:1, stir at 65°C for 2 hours, and filter to obtain the loaded adsorbent and the solution after adsorption and dearsenization. The liquid after arsenic removal is used to recover copper and nickel; the loaded adsorbent is mixed with water at a solid-to-liquid ratio of 1:3g / ml, then added with sodium carbonate to adjust the pH to 10.8, stirred at 75°C for 3 hours for desorption regeneration, and filtered to obtain the regenerated adsorbent and desorption after liquid. After desorption, the liquid is cooled to room temperature to crystallize Na 2 HASO 4 12H 2 O, filtered to obtain disodium hydrogen arsenate and its crystallization mother liquor. Disodium hydrogen arsenate is collected for the recovery of arsenic, and the crystallization mother liquor is returned to the loaded adsorbent fo...

Embodiment 3

[0038] Take 3L of lead anode slime hydrochloric acid leaching solution, add Sb according to the molar ratio of (Sb(III)+Bi(III)) / As 3:1 2 o 3 and Bi 2 o 3 A mixture of Sb in the mixture 2 o 3 with Bi 2 o 3 The molar ratio of Sb(V) / Sb(III) is 1:3, and the hydrated Sb is added according to the Sb(V) / Sb(III) molar ratio of 1:2.5 2 o 5 , stirred at 85°C for 0.5h to adsorb and remove arsenic, cooled to 50°C and filtered to obtain loaded adsorbent and arsenic-removed liquid. After arsenic removal, liquid separation and recovery of valuable metals therein were carried out; the loaded adsorbent was first added to the crystallization mother liquor obtained in Example 1 at a solid-to-liquid ratio of 1:4 g / ml, then sodium hydroxide was added to adjust the pH to 13.7, and stirred at 70°C for 1.5 hours. The regenerated adsorbent and desorbed liquid are obtained by filtration. After desorption, add an appropriate amount of hydrogen peroxide to oxidize a small amount of As(III) into...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A method for separating and recovering arsenic from a metallurgical material acid leaching liquid comprises the following steps: selectively adsorbing arsenic by adopting antimony or/and bismuth oxide and hydrate thereof as an adsorbent in order to remove arsenic, and filtering to obtain an arsenic removed liquid and a supported adsorbent; recovering valuable metals from the arsenic removed liquid, adding a sodium carbonate or/and sodium hydroxide solution to the supported adsorbent, carrying out stirring desorbing regeneration, and filtering to obtain a regenerated adsorbent and a desorption liquid; and returning the regenerated adsorbent to the arsenic adsorbing removal process for cycle use, carrying out cooling crystallization on the desorption liquid to precipitate disodium hydrogen arsenate crystals, and returning a disodium hydrogen arsenate crystallization mother liquor to the above supported adsorbent desorption process for cycle use. Obtained disodium hydrogen arsenate can be dried to obtain a product, and the product can be directly sold in the market, or can be used as an arsenous acid production raw material in order to realize recycling of As in the acid leaching liquid. The method has the advantages of simple process, simple operation, low production cost, good arsenic removal effect, no side effects on recovery of the valuable metal from the liquid, and thorough elimination of pollution of the arsenic removal process of the metallurgical material acid leaching liquid to environment.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for separating and recovering arsenic from acid leaching liquid of metallurgical materials. Background technique [0002] Arsenic is a common impurity element in non-ferrous metallurgical materials. During the acid leaching process of metallurgical materials, arsenic enters the solution together with valuable metals. Arsenic damage control is an important issue facing hydrometallurgy. [0003] Existing methods for separating arsenic from acidic solutions include direct precipitation, reduction precipitation, ion exchange, and solvent extraction. [0004] The direct precipitation method is usually to add iron salt or lime to form arsenate precipitation, and the obtained arsenic-containing precipitate is a dangerous solid waste, which must be solidified and landfilled, otherwise it will easily cause secondary pollution. [0005] The reduction precipitation metho...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/24C22B30/04
CPCY02P10/20
Inventor 王学文王明玉
Owner CENT SOUTH UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap