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Method for removing arsenic from acidic arsenic-containing solution by using iron salt

A solution and acidic technology, applied in chemical instruments and methods, iron compounds, neutralized water/sewage treatment, etc., can solve the problems of long precipitation reaction time, harsh reaction conditions, and difficult access to scorodite, etc., to achieve accelerated growth, The effect of mild process conditions and enhanced mutual repulsion

Active Publication Date: 2019-08-09
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with other methods, this method has lower cost and higher versatility, but the reaction conditions are harsh, exceeding the critical state will produce amorphous iron arsenate
And because the primary crystal seed scorodite is not easy to obtain, the activity of foreign seeds such as gypsum and hematite is low, the concentration of the seed crystals to be added is high (50-80g / L), the precipitation reaction time is as long as 5-7h, and the formed arsenic Large amount of iron slag
In addition, due to the strong surface effect of the seed crystal, solid particles are easy to collide with each other, attract and aggregate into agglomerates, which affects the precipitation process

Method used

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  • Method for removing arsenic from acidic arsenic-containing solution by using iron salt
  • Method for removing arsenic from acidic arsenic-containing solution by using iron salt
  • Method for removing arsenic from acidic arsenic-containing solution by using iron salt

Examples

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Embodiment 1

[0034] Such as figure 1 Shown, a kind of method that utilizes iron salt to remove arsenic from acidic arsenic-containing solution (copper smelting soot pickling solution), acid is sulfuric acid in the copper smelting soot pickling solution in this example, copper smelting soot pickling solution main component ( g / L) is Cu 22.409, As22.830, Fe 0.242, Zn 5.498, Cd 2.735. The method of this embodiment specifically includes the following steps:

[0035] (1) with the step (1) of comparative example;

[0036] (2) Take 200mL copper-removed solution and put them in three beakers for arsenic removal test, adjust the pH to 2.0 with sodium carbonate, add ferrous sulfate according to the total Fe / As molar ratio in the solution 1.2:1, stir and heat to 30 ℃, add magnetite powder, control the concentration of magnetite in the solution to 5, 10, 20g / L respectively, add oxidant ammonium persulfate, control the concentration of oxidant in the solution to 1mol / L. After stirring for 5-10min, a...

Embodiment 2

[0044] A kind of method that utilizes iron salt to remove arsenic from acidic arsenic-containing solution (copper smelting smoke pickling solution), in this example, the acid in the copper smelting smoke pickling solution is sulfuric acid, and the main component of copper smelting smoke pickling solution (g / L ) is Cu 22.409, As 22.830, Fe0.242, Zn 5.498, Cd 2.735. The method of this embodiment specifically includes the following steps:

[0045] (1) with the step (1) of comparative example;

[0046] (2) Take three 200mL copper-removed solutions for arsenic removal test, adjust the pH to 2.0 with sodium carbonate, according to the total Fe / As molar ratio in the solution (1.0:1), (1.2:1), (1.5:1 ) add ferrous sulfate, stir and heat to 30°C, add magnetite powder, control the concentration of magnetite in the solution to be 10g / L, add oxidant ammonium persulfate, control the concentration of oxidant in the solution to be 1mol / L, After stirring for 5-10min, add the dispersant sodi...

Embodiment 3

[0052] A kind of method that utilizes iron salt to remove arsenic from acidic arsenic-containing solution (copper smelting smoke pickling solution), in this example, the acid in the copper smelting smoke pickling solution is sulfuric acid, and the main component of copper smelting smoke pickling solution (g / L ) is Cu 22.409, As 22.830, Fe0.242, Zn 5.498, Cd 2.735. The method of this embodiment specifically includes the following steps:

[0053] (1) with the step (1) of comparative example;

[0054] (2) Take three 200mL copper-removed solutions for arsenic removal test, adjust the pH to 2.0 with sodium carbonate, add ferrous sulfate according to the Fe / As molar ratio of 1.2:1, stir and heat to 30°C, and add magnetite powder , control the concentration of magnetite in the solution to be 10g / L, add oxidant hydrogen peroxide, ferrate, ammonium persulfate respectively, control the concentration of oxidant in the solution to be 1mol / L. After stirring for 5-10min, add the dispersan...

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Abstract

The invention discloses a method for removing arsenic from an acidic arsenic-containing solution by using an iron salt. The method comprises the following steps: (1) adjusting the pH value of the acidic arsenic-containing solution, stirring and heating the adjusted solution, and adding a ferrous salt to obtain a mixed solution; and (2) adding magnetite to the mixed solution, adding an oxidant, stirring, heating and reacting the obtained solution, and filtering the solution to remove scorodite filter residues in order to complete the removal of arsenic in the acidic arsenic-containing solution.A precipitate obtained after arsenic precipitation of new highly-active crystal seeds is iron arsenate with a good crystal form, and has the advantages of high arsenic content, small size, complete crystal form structure, low toxicity leaching concentration of arsenic, good long-term stability, and easiness in clarification, filtration and separation. The method has the advantages of mild processconditions, simple process, convenience in operation, small dosages of reagents, small amount of arsenic iron residues, low price and low cost of the raw material, and realization of the production of the iron arsenate precipitate-scorodite with the good crystal form from the acidic arsenic-containing solution of copper smelting flue dust.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, in particular to a method for removing arsenic from acidic arsenic-containing solution. Background technique [0002] The metallurgical process of non-ferrous metal sulfide ore and gold extraction process will produce a variety of arsenic-containing waste liquid, waste residue and smoke, which are the main pollutants in the process of non-ferrous metal extraction metallurgy. Such arsenic-containing materials are highly toxic, bioaccumulative and carcinogenic, and must be harmlessly treated before being discharged. At present, the methods for treating arsenic-containing wastewater and arsenic-containing solutions mainly include chemical precipitation, physical methods and microbial methods, among which chemical precipitation is widely used. The chemical precipitation method uses (sub)arsenate (AsO 3 3- / AsO 3 4- ) form low solubility arsenate (calcium arsenate, iron arsenate and arsen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66C02F1/72C01G49/00C02F101/10C02F103/16
CPCC01G49/00C02F1/66C02F1/72C02F2101/103C02F2103/16
Inventor 徐斌李骞马永鹏姜涛高伟杨永斌董中林周玉娟陈燕珠李光辉郭宇峰黄柱成张元波彭志伟易凌云杨凌志
Owner CENT SOUTH UNIV
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