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Method for treating arsenic-containing industrial wastewater

A technology for industrial waste water and waste water, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as harsh reaction conditions, achieve low risk, reduce treatment costs, reduce The effect of residue production

Active Publication Date: 2014-08-06
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been many reports on the synthesis methods of scorodite, but most of them have harsh reaction conditions and need to strictly control the degree of supersaturation

Method used

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  • Method for treating arsenic-containing industrial wastewater
  • Method for treating arsenic-containing industrial wastewater
  • Method for treating arsenic-containing industrial wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Na 3 AsO 4 .12H 2 O was dissolved in 100ml of distilled water to make a solution containing As: 10g / L, and concentrated sulfuric acid was added at room temperature to adjust the pH to 1.1; it was heated to 95°C under mechanical stirring (200rpm); 2 (SO 4 ) 3 .xH 2 O and FeSO 4 .7H 2 O was dissolved in 100ml of distilled water at the same time to prepare a mixed iron solution containing Fe(III): 7.5g / L and Fe(II): 3.75g / L. Use a peristaltic pump to add the mixed iron solution into the arsenic solution at a speed of 0.4ml / min, drop it for about 4 hours, and keep it at 95°C for 4 hours after the drop, cool to room temperature after the reaction, and separate the solid and liquid to obtain a stable The precipitation of scorodite crystals, the X-ray diffraction analysis and scanning electron microscope analysis pictures of the precipitation are as follows figure 1 and figure 2 shown.

Embodiment 2

[0024] Na 3 AsO 4 .12H 2 O was dissolved in 100ml of distilled water to make a solution containing As: 50g / L, and concentrated sulfuric acid was added at room temperature to adjust the pH to 0.8; it was heated to 70°C under mechanical stirring (200rpm); 2 (SO 4 ) 3 .xH 2 O and FeSO 4 .7H 2 O was dissolved in 100ml of distilled water at the same time to prepare a mixed iron solution containing Fe(III): 28g / L and Fe(II): 14g / L. Use a peristaltic pump to add the mixed iron solution into the arsenic solution at a rate of 0.3ml / min, drop it for about 6 hours, and keep it at 95°C for 2 hours after the drop, cool to room temperature after the reaction, and separate the solid and liquid to obtain a stable Precipitation of scorodite crystals.

Embodiment 3

[0026] Na 3 AsO 4 .12H 2 O was dissolved in 100ml of distilled water to prepare a solution containing As: 1g / L, and adjusted to pH 2.0 by adding concentrated sulfuric acid at room temperature; heated to 90°C under mechanical stirring (200rpm); 2 (SO 4 ) 3 .xH 2 O and FeSO 4 .7H 2 Dissolve O at the same time in 100ml distilled water to prepare a mixed iron solution containing Fe(III): 0.75g / L and Fe(II): 0.4g / L. Use a peristaltic pump to add the mixed iron solution into the arsenic solution at a rate of 0.8ml / min, drop it in about 2 hours, keep it at 95°C for 6 hours after the drop, cool to room temperature after the reaction, and separate the solid and liquid to obtain a stable Precipitation of scorodite crystals.

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Abstract

The invention belongs to the wet metallurgy and environmental protection technical fields, and particularly, discloses a method for treating arsenic in arsenic-containing industrial wastewater. Under a condition of high temperature, an iron solution is slowly added into the arsenic-containing industrial wastewater, arsenic in the wastewater forms a stable scorodite crystal (FeAsO4.2H2O), and thus arsenic in the wastewater is removed. The method is simple in process, can obtain the stable arsenic-containing solid waste, and reduces secondary pollution caused to the environment.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and environmental protection, and specifically relates to a method for treating arsenic-containing industrial wastewater. Background technique [0002] Arsenic is a toxic element that mainly exists in the form of sulfide and is associated with other metals such as: gold, copper, lead, nickel, cobalt, zinc, etc. A large amount of high-concentration arsenic-containing wastewater will be produced. The arsenic in these waste waters must be removed with stable compounds before the waste water can be discharged. Therefore, the removal and fixation technology of arsenic in the field of non-ferrous metal smelting research has always been a research hotspot. [0003] At present, the treatment technologies for arsenic-containing wastewater mainly include scorodite method, lime method, and lime-iron salt method. The lime-iron salt method adds iron salt to the arsenic-containing wastewater, so that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 贾永锋王宽岭
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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