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Method for recovering simple substance arsenic from arsenic sulfide slag

A technology of arsenic sulfide and recycling bills, applied in the direction of improving process efficiency, etc., can solve the problems of low recovery value, pollution, low arsenic utilization rate, etc., and achieve simple process flow, easy control of operating conditions, significant economic benefits and environmental protection benefits Effect

Inactive Publication Date: 2009-03-18
湖南宏大锑铅有限公司
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Problems solved by technology

[0002] Patent No. 00131557.9 and Patent No. 200410023055.0 respectively disclose methods for recovering antimony from arsenic-alkali slag by leaching. The common point is that the arsenic in arsenic-alkali slag is turned into arsenic sulfide slag. New arsenic sulfide slag is produced, causing new pollution, and the utilization rate of arsenic is not high, and the recovery value is low

Method used

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Embodiment Construction

[0011] A method for recovering elemental arsenic from arsenic sulfide slag, comprising the following steps:

[0012] (1) Prepare an acidic solution containing copper chloride. According to the weight ratio of copper chloride to water is 1:5-6 (6 in this embodiment), add hydrochloric acid or sodium hydroxide to adjust the pH value of the solution to 1.5-2.5 (2 in this embodiment). The temperature is controlled at 70°C-80°C, and the arsenic sulfide slag is impregnated with the prepared acidic solution containing copper chloride in a reaction vessel under the action of a 0.5T-0.6T permanent magnetic field to obtain an arsenic-rich solution, and cooled to room temperature Fold As 2 o 3 Crystals, filtered, and the filtrate returned to the arsenic leaching process;

[0013] (2) As obtained from step (1) 2 o 3 Crystal, add concentrated hydrochloric acid to adjust the acidity to 10mg / l, add SnCl according to the As:Sn stoichiometric ratio of 1:1 based on the content of As ions in...

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Abstract

The invention relates to a method for reclaiming simple substance arsenic from arsenic sulfide slag. The method comprises the following steps: the arsenic sulfide slag is immersed in an acidic solution containing copper chloride to obtain an arsenic-rich solution; the arsenic-rich solution is cooled to the room temperature and is precipitated with a As2O3 crystal; the As2O3 crystal is added with concentrated hydrochloric acid and SnCl2 and is oxidized and reduced to the simple substance arsenic; and the simple substance arsenic is subjected to dehydration, pickling, drying and purification to obtain the simple substance arsenic with the arsenic content of more than or equal to 90 percent. The method has simple process flow, is easy to control the operating condition, can convert arsenic in the arsenic sulfide slag into the simple substance arsenic, has the arsenic reclaiming rate reaching 99 percent and has remarkable economic benefit and environmental benefit.

Description

Technical field: [0001] The invention relates to a method for recovering elemental arsenic from arsenic sulfide slag. Background technique: [0002] Patent No. 00131557.9 and Patent No. 200410023055.0 respectively disclose methods for recovering antimony from arsenic-alkali slag by leaching. The common point is that the arsenic in arsenic-alkali slag is turned into arsenic sulfide slag. New arsenic sulfide slag is produced, causing new pollution, and the utilization rate of arsenic is not high, and the recovery value is low. Invention content: [0003] The purpose of the present invention is to provide a method for recovering elemental arsenic from arsenic sulfide slag. [0004] The present invention realizes its object of invention by adopting the following technical scheme, a method for recovering elemental arsenic from arsenic sulfide slag, which comprises the following steps: [0005] (1) In the acidic solution containing copper chloride, the temperature is controlle...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B30/04
CPCY02P10/20
Inventor 龚奠平龚海龙李承义
Owner 湖南宏大锑铅有限公司
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