Stable arsenic acid iron slag solidifying method

A technology of iron arsenate slag and solidification method, which is applied in the direction of improving process efficiency, etc., can solve the problems of high cost and large amount of ferrous sulfate, and achieve the effect of large specificity, high strength and environmental friendliness

Active Publication Date: 2017-01-04
CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the amount of Portland cement and ferrous sulfate added in this patent document is large, and there are certain requirements for the components of Portland cement and fly ash, and the cost is relatively high

Method used

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  • Stable arsenic acid iron slag solidifying method

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Embodiment 1

[0027] A method for stable solidification of iron arsenate slag, including the following steps:

[0028] (1) The iron arsenate slag, additives and reducing agent are firstly crushed separately so that the raw material particles with a particle size of less than 120μm account for more than 98%, and then mixed uniformly to obtain a mixed raw material.

[0029] (2) Place the mixed raw materials in a molding mold for molding (preferably tablet molding), the molding pressure is 6.2MPa, the molding temperature is room temperature, and the pressure holding time is 7.5s to obtain a molded part, which is dried for 48h after demolding.

[0030] (3) Put the dried parts into an electric furnace for reduction (specifically carbothermic reduction), turn on the electric dust collection, control the reduction temperature to 800℃, and the reduction time to 2.5h. After reduction, sulfur and arsenic are obtained. Iron ore and arsenic pyrite can be used for weighting, and the flue gas produced by reduct...

Embodiment 2

[0038] A method for stable solidification of iron arsenate slag, including the following steps:

[0039] (1) The iron arsenate slag, additives and reducing agent are firstly crushed separately so that the raw material particles with a particle size of less than 120μm account for more than 98%, and then mixed uniformly to obtain a mixed raw material.

[0040] (2) Place the mixed raw materials in a molding die for molding (preferably tablet molding), the molding pressure is 7.0 MPa, the molding temperature is room temperature, and the pressure-holding time is 4.6 s to obtain molded parts, which are dried for 48 hours after demolding.

[0041] (3) Put the dried parts into an electric furnace for reduction, turn on the electric dust collector, control the reduction temperature to 1050℃, and the reduction time to 2.0h. After reduction, pyrite and pyrite are obtained. It can be used for counterweight, and the flue gas produced by reduction is discharged after purification.

[0042] In this ...

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PUM

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Abstract

The invention discloses a stable arsenic acid iron slag solidifying method. The stable arsenic acid iron slag solidifying method comprises the steps that arsenic acid iron slag, an additive and a reducing agent are mixed evenly, geierite is obtained through forming and reduction, and stable solidifying treatment is completed. The method can be used for directly producing geierite, dissolution of arsenic in waste slag can be effectively prevented, bounce does not occur with time, the geierite obtained after stable solidifying is high in strength, large in specific gravity and good in hydrolytic resistance, can be used for balance weight, the environmental environment caused by arsenic-containing slag stockpiling is eliminated, and stable solidifying of arsenic slag is achieved.

Description

Technical field [0001] The invention relates to a harmless treatment process of iron arsenate slag, in particular to a stable solidification method of iron arsenate slag. Background technique [0002] The hydrometallurgical treatment of many sulfide ore (such as copper or lead ore) and certain oxide ore (such as uranium ore) often leads to the dissolution of arsenic, which increases the arsenic content in the solution. The arsenic must be removed from the solution to make It becomes a form that meets environmental protection requirements. The high arsenic solution adopts ferrous salt air oxidation method to precipitate arsenic to prepare a solid scorodite (iron arsenate) containing arsenic with high arsenic content and a crystal structure. This method has been successfully applied to dispose of arsenic. However, iron arsenate is a hazardous waste and has greater hazards. When considering the Fe / As ratio of the precipitate and the crystallinity of the sample, such as the amorphou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B7/04
CPCC22B1/005C22B7/001C22B7/04Y02P10/20
Inventor 蒋晓云刘自亮赵思佳祝秋萍
Owner CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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