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Method for treating high-arsenious solution with low cost

A low-cost, solution-based technology, applied in water/sewage treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of discontinuity and increased treatment costs, and achieve simple operation and low loss Effect

Active Publication Date: 2011-03-16
YUNNAN WUXIN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned oxidizing agent is added quantitatively and does not have continuity. To reach a certain depth, it must be continuously added. This will inevitably add an excessive amount of oxidizing agent and increase the processing cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1. Containing As3 + 6.1g / l, total arsenic content is 7g / l, organic matter 3.5g / l, Zn100g / l, Fe2 + 200mg / l, in a sulfuric acid solution with a pH value of 5.4, according to As / Cu2 + =5 add CuSO 4 ·5H 2 O, continuously bubbling air for 3 hours at 50°C for oxidation. The total arsenic removal rate reaches 94.5%. The Zn loss was 11%, which was 14% less than the Zn loss of 25% in the ferric hydroxide adsorption method.

Embodiment 2

[0013] Embodiment 2. to total containing arsenic 1.1g / l, containing Zn134g / l, Fe860mg / l, Ge250mg / l, pH is the sulfuric acid industrial leachate of 2.5, after extracting germanium with N235 kerosene system, adjusting pH value is 5.6, press As / Cu2 + =5.5 Add CuSO4·5H2O, continuously blow air (15 liters / second) at 25° C. for 2.5 hours, filter, the slag contains 15% zinc, and the filtrate contains 55 mg / l arsenic.

Embodiment 3

[0014] Example 3. As 2 o 3 Soluble in sulfuric acid, make a solution containing As15g / l, Zn50g / l, Fe1.5g / l, PH5.2, divided into two groups. One group adjusted the pH value to 8-9, most of the zinc and iron were hydrolyzed and precipitated, and the filtered filtrate contained 10.5 g / l of arsenic. The second group according to As / Cu2 + =6 add CuSO 4 ·5H2O, heated to 40°C and blown air continuously for 3.5 hours, after filtration, the filtrate contained 200mg / l of arsenic, 45g / l of Zn, and 50mg / l of Fe. It can be seen that the effect of this method on removing arsenic is obvious

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PUM

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Abstract

The invention discloses a method for treating high-arsenious solution with low cost, belonging to the technical field of hydrometallurgy and environment protection. Soluble salt containing bivalent copper is added to high-arsenious solution whose gross arsenic content is greater than 0.5g / l according to weight ratio of As / Cu<2+>=5-6 under the condition that PH value is 5-6 and temperature is 15-60 DEG C, and air is continuously blown in to ensure the solution writhes for 2-3 hours for oxidation. The soluble salt containing bivalent copper is preferably CuSO4. The invention has the following beneficial effects: 1. added Cu<2+> only performs the catalyzing function of oxidizing trivalent arsenic into pentavalent arsenic, so adding amount is small, and zinc power, scrap iron and the like canbe used for replacing and recovering after precipitation and dearsenization; 2. as air is continuously blown in, oxidation dearsenization is a continuous process, and oxidation dearsenization stops until needed purification depth is achieved, so that operation is simple and easy to realize; 3. the purification treatment cost of arsenic is greatly lower than that of other oxidant methods; 4. compared with hydrometallurgy that Fe(OH)3 is used to adsorb arsenic for coprecipitation, the invention has the advantage that the loss of other valuable metal in slag is lowered by about 10%.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and environmental protection. Background technique [0002] Arsenic is a harmful component in most metallurgical processes and wastewater treatment and must be separated and removed. In general, As in aqueous solution mainly exists in trivalent form, accounting for more than 80% of the total arsenic content. When hydrometallurgy adopts metal replacement method, it is easy to generate H 3 As endangers the operator. When using adsorption method or generating insoluble salt precipitation, due to arsenous acid (As 3+ ) dissociation equilibrium constant is much smaller than that of arsenic acid (As5 + ), so trivalent arsenic is not easily removed by hydrolysis to form insoluble salts, and pentavalent arsenic is much easier to remove than trivalent arsenic. The removal of arsenic by sulfide method must be carried out under high acidity, and other valuable metal components will also be sulfi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/74C02F1/58C01G28/00
Inventor 李世平张本聪余树华
Owner YUNNAN WUXIN IND
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