Method for extracting and separating arsenic and iron in chloride system

A chloride and extraction technology, which is applied in the field of chemical solvent extraction, can solve the problems of dangerous solid waste containing arsenic, difficulty in effectively separating arsenic and iron, etc., and achieve the effects of low consumption of chemical reagents, low cost, and high recovery rate of arsenic

Inactive Publication Date: 2020-07-31
CENT SOUTH UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that it is difficult to effectively separate arsenic and iron in the chloride system in the prior art, the purpose of the present invention is to provide a me

Method used

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  • Method for extracting and separating arsenic and iron in chloride system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 100mL containing As 3.0g / L, Fe 20g / L, H + 0.5mol / L, Cl - 7.0mol / L feed solution, and 50mL organic phase containing 20% ​​isooctyl alcohol and 80% sulfonated kerosene, mixed in a separatory funnel at 30°C for 2min, then allowed to stand for clarification and phase separation; after releasing the raffinate , mix the arsenic-loaded organic phase with 50 mL of 0.5 mol / L hydrochloric acid aqueous solution at 30°C for 10 minutes, then let stand to clarify and separate the phases, release the stripping liquid, and return the blank organic phase after stripping to the extraction process for recycling.

[0028] The raffinate obtained after extraction contains As 0.34g / L and Fe 19g / L; the strip obtained after stripping contains As4.7g / L and Fe 1.9g / L.

Embodiment 2

[0030] The invention provides a method for extracting and separating arsenic and iron in a chloride system, such as figure 1 shown, including the following steps:

[0031] (1) Extract arsenic: extract As 3.0g / L, Fe 20g / L, H + 0.5mol / L, Cl - 7.0mol / L feed solution, and the organic phase containing 20% ​​isooctyl alcohol and 80% sulfonated kerosene, after carrying out 3-stage countercurrent extraction under the conditions of 30°C, a phase ratio of 1 / 2, and a contact time of 2min, the extracted The remaining liquid is released;

[0032] (2) Back-extraction of arsenic: after three-stage countercurrent back-extraction of the arsenic-containing organic phase and 0.5mol / L hydrochloric acid aqueous solution at 30°C, a ratio of 1 / 1, and a contact time of 10 minutes, the back-extraction liquid release;

[0033] (3) The blank organic phase after stripping is returned to the extraction process for recycling.

[0034] The raffinate obtained after three-stage countercurrent extraction ...

Embodiment 3

[0036] Take 100mL containing As 2.6g / L, Fe 18g / L, H + 3.0mol / L, Cl - 6.0mol / L feed solution, and 300mL organic phase containing 5% 2-octanol and 95% sulfonated kerosene, mixed in a separatory funnel at 30°C for 10min, then allowed to stand for clarification and phase separation; , mix the arsenic-containing organic phase with 60 mL of 2.0 mol / L sulfuric acid aqueous solution at 30°C for 5 minutes, then let it stand for clarification and separate the phases. After releasing the stripping liquid, return the blank organic phase after stripping to the extraction process for recycling.

[0037] The raffinate obtained after extraction contains As 0.39g / L and Fe 17.4g / L; the strip obtained after stripping contains As3.4g / L and Fe 0.94g / L.

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Abstract

The invention discloses a method for extracting and separating arsenic and iron in a chloride system, and belongs to the technical field of chemical solvent extraction. The method comprises the stepsof firstly, arsenic extraction, wherein a prepared organic phase is in contact with a hydrochloric acid solution containing iron and arsenic to be subjected to single-stage or multi-stage counter-current extraction, arsenic irons are selectively extracted into the organic phase, and most iron ions are left in extraction raffinate; secondly, arsenic reverse extraction, wherein an arsenic-containedloaded organic phase is in contact with a dilute inorganic acid water solution to be subjected to single-stage or multi-stage counter-current reverse extraction, and a blank organic phase and arsenic-rich strip liquor after reverse extraction are obtained; and thirdly, returning of the blank organic phase after reverse extraction to the first step to be repeatedly used, wherein the arsenic-rich strip liquor is used for further preparing an arsenic compound. The organic phase is formed through mixing of an extraction agent and a diluting agent, the extraction agent is a neutral alcohol extraction agent, and is on or combination of multiple of n-caprylic alcohol, isooctyl alcohol and sec-octyl alcohol, the flow is short, the arsenic recycling rate is high, the chemical reagent consumption islittle, cost is low, and industrialization is easily achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical solvent extraction, and in particular relates to a method for extracting and separating arsenic and iron in a chloride system. Background technique [0002] Alkaline tungsten smelting slag is the waste slag produced during the high-pressure leaching of tungsten ore with sodium carbonate or sodium hydroxide. It has been listed as a solid hazardous waste by the Ministry of Environmental Protection. It mainly includes elements such as calcium, iron, arsenic, tin, tungsten, and fluorine. . At present, the utilization rate of these basic tungsten smelting slags is low, and most of them are piled up by factories, which not only causes a waste of resources, but also brings potential safety hazards to the environment. [0003] In order to recover the valuable metals in the basic tungsten smelting slag and realize the reduction and recycling of hazardous waste slag, hydrochloric acid leaching is often us...

Claims

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Application Information

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IPC IPC(8): C22B30/04C22B3/26
CPCC22B30/04C22B3/26Y02P10/20
Inventor 霍广生刘辉易新涛王松林丁伟胡灯红邹元焘张四华郭磊
Owner CENT SOUTH UNIV
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