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Method for harmlessly treating arsenic in arsenic-containing waste liquid

A technology of waste liquid and arsenic precipitation, which is applied in the fields of chemical instruments and methods, metallurgical wastewater treatment, arsenate/arsenite, etc., can solve the problems that affect the leaching toxicity stability of mixed arsenic slag, high acidity of scorodite precipitation, Solve the problems of large amount of scorodite mixed slag, etc., to achieve the effect of reducing the amount of arsenic fixation solution, economical treatment cost, and low risk of environmental pollution

Inactive Publication Date: 2021-06-04
ZIJIN MINING GROUP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the scorodite precipitation in the first stage has high acidity, and it needs to be washed clean before it is suitable for storage or landfill, so a large amount of acidic washing water will be generated to be treated, which increases the processing capacity of the system; the second precipitation stage requires Add iron source to adjust the ratio of iron to arsenic to be greater than 3, and all the amorphous ferric arsenate precipitates will return to the first precipitation stage, the cost of chemicals is high, and the amount of gypsum and scorodite mixed slag produced is large, and the cost of storage or landfill disposal is high; If the returned amorphous ferric arsenate is not fully reversed in the first precipitation stage, it will affect the leaching toxicity stability of the mixed arsenic slag entering the landfill

Method used

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  • Method for harmlessly treating arsenic in arsenic-containing waste liquid

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Embodiment 1

[0027] This embodiment provides a method for harmless arsenic disposal of arsenic-containing waste liquid. The arsenic-containing waste liquid contains 8.86 g / L of arsenic and 68 g / L of sulfuric acid. Such as figure 1 shown, including the following steps:

[0028] 1) Pre-neutralization: add limestone to the arsenic-containing waste liquid for pre-neutralization, control the terminal acidity to 15g / L, filter the neutralized pulp to obtain a mixture of gypsum slag and high arsenic, and wash the gypsum slag to obtain a low-arsenic wash liquid;

[0029] 2) Precipitation of ferric arsenite: add ferric sulfate to the high-arsenic mixture, control the molar ratio of iron to arsenic to 1.2:1, after complete dissolution, add milk of lime to neutralize to pH 7.0, and precipitate ferric arsenite; carry out thickening to obtain Low arsenic overflow liquid and iron arsenite underflow with a mass concentration of 30%;

[0030] 3) Precipitation of arsenic by oxidation: Add concentrated su...

Embodiment 2

[0037] This embodiment provides a method for arsenic harmless disposal of arsenic-containing waste liquid. The arsenic-containing waste liquid contains 28.6 g / L of arsenic and 192 g / L of sulfuric acid. Such as figure 1 shown, including the following steps:

[0038] 1) Pre-neutralization: Add arsenic-containing waste liquid to limestone for pre-neutralization, control the end-point acidity to 20g / L, filter the neutralized pulp to obtain gypsum slag and high-arsenic mixed liquid, and wash the gypsum slag to obtain low-arsenic lotion ;

[0039] 2) Ferric arsenite precipitation: add ferric sulfate solution to the high-arsenic mixture, and control the molar ratio of iron to arsenic to 1.5:1; after complete dissolution, add milk of lime, neutralize to pH 5.0, and then thicken to obtain low Arsenic overflow liquid and iron arsenite underflow with a mass concentration of 25%;

[0040] 3) Precipitation of arsenic by oxidation: add the arsenic-containing waste liquid of this example ...

Embodiment 3

[0047] This embodiment provides a method for harmless arsenic disposal of arsenic-containing waste liquid, wherein the arsenic-containing waste liquid contains 0.5 g / L of arsenic and 25 g / L of sulfuric acid. Such as figure 1 shown, including the following steps:

[0048] 1) Pre-neutralization: add limestone to the arsenic-containing waste liquid for pre-neutralization, control the terminal acidity to 10g / L, filter and wash the neutralized pulp to obtain gypsum slag and arsenic-containing solution;

[0049] 2) Precipitated iron arsenite: ferric sulfate is added to the arsenic-containing solution according to the molar ratio of iron to arsenic 1.3:1. After it is completely dissolved, add milk of lime to neutralize to a pH value of 7.0, and then thicken to obtain a low-arsenic overflow solution and quality 23% ferrous arsenite underflow;

[0050] 3) Precipitation of arsenic by oxidation: add concentrated sulfuric acid to the underflow of ferric arsenite, stir to dissolve, and c...

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Abstract

The invention discloses a method for harmlessly treating arsenic in arsenic-containing waste liquid, which is characterized in that the arsenic-containing waste liquid is harmlessly treated by adopting a process of settling iron arsenite, oxidizing and settling arsenic and deeply settling arsenic, the arsenic is solidified in a most stable scorodite form and enters a landfill for landfill, and the treated waste liquid can be directly recycled or discharged. The method can be suitable for harmless treatment of arsenic in arsenic-containing solutions with various concentrations.

Description

technical field [0001] The invention relates to the fields of nonferrous metal smelting and environmental protection, in particular to a method for harmless disposal of arsenic-containing waste liquid. Background technique [0002] The harmless disposal of arsenic-containing wastewater has always been the focus of smelting enterprises. As people pay more attention to environmental protection and environmental protection policies are becoming stricter, wastewater disposal has become a hurdle that restricts the development of enterprises. [0003] At present, the existing arsenic-containing wastewater treatment methods mainly have the following directions: (1) Preparation of products, such as copper arsenate, diarsenic trioxide, elemental arsenic, etc., but due to the small market for the products, the products that cannot be sold in time are piled up in the warehouse, which poses a safety hazard , and the process has problems such as high production cost at the same time. Th...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01G28/02C02F1/52C02F1/72C02F103/16C02F101/10
CPCC01G28/02C02F1/5236C02F1/722C02F2101/103C02F2103/16C02F2301/08
Inventor 蒋开喜陈景河许晓阳王乾坤郭金溢庄荣传肖琴林鸿汉
Owner ZIJIN MINING GROUP
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