Method for treating arsenic-containing waste polluted acid by using industrial iron-containing waste mud

A waste acid, industrial technology, applied in sludge treatment, water/sludge/sewage treatment, sedimentation treatment, etc., can solve the problems of high treatment cost, high arsenic content, large dosage of chemicals, etc., and achieves simple process and utilization. High rate and inclusive effect

Inactive Publication Date: 2018-03-27
ZHANGJIAGANG GREEN TECH ENVIRONMENTAL PROTECTION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong acidity and high arsenic content of arsenic-containing waste sewage, it is necessary to add a large amount of strong alkali and arsenic removal agents (such as iron salts, aluminum salts, calcium salts, etc.) during treatment. The amount of chemicals used is large and the treatment cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A copper smelter in Guangxi produces about 400 tons of arsenic-containing waste acid every day, with a sulfuric acid concentration of 20g / L and an arsenic concentration of 9g / L.

[0036]The current treatment method of the arsenic-containing waste acid is: first adjust the pH value of the wastewater to above 12.5 with lime milk, aerate, settle, and press filter; use ferrous sulfate solution to adjust the pH value of the press filter to 8.5-9 At the same time, a large amount of flocculent compounds rich in iron and arsenic are produced, aeration, sedimentation, pressure filtration, and the clear liquid is discharged after reaching the standard. According to calculations, about 28.3kg of calcium hydroxide (content≧85wt%) and 15.2kg of ferrous sulfate will be consumed to treat each ton of arsenic-containing waste acid, and about 103kg of solid waste (water content about 60wt%) will be produced. Comprehensive treatment The cost is about 220.4 yuan / ton.

[0037] The red mud ...

Embodiment 2

[0040] A steel products factory in Hubei produces 5-8 tons of pickling waste sludge every day, the main component of which is ferrous hydroxide, and also contains a small amount of ferric hydroxide, aluminum hydroxide and calcium hydroxide. A local copper smelter produces about 120 tons of arsenic-containing waste acid every day, with a sulfuric acid concentration of 17.8g / L and an arsenic concentration of 5.3g / L.

[0041] The waste acid containing arsenic in the copper smelter is treated by using the pickling waste sludge produced by the above-mentioned iron and steel products factory. Add 5kg of pickling waste sludge to 100L of arsenic-containing waste acid, stir for 15 minutes, and then continue to aerate for 2 hours. After the aeration, add 2.91kg of liquid caustic soda (concentration: 30wt%), adjust the pH value to 8.1, and stir for 15 minutes, precipitate, and press filter with a small test filter press. The press filtrate was sampled and tested, and the test results sh...

Embodiment 3

[0044] A certain place in Hunan is seriously polluted by arsenic, and the source of the pollution is mainly arsenic-containing waste acid discharged from a local realgar mine and a sulfuric acid plant that has not been treated or has not been treated up to standard. Sampling and testing of the arsenic-containing waste acid produced by the sulfuric acid plant showed that the concentration of sulfuric acid was 28.5g / L, and the concentration of arsenic was as high as 19.1g / L.

[0045] The pickling waste sludge produced by a steel product factory was used to treat the arsenic-containing waste acid from a sulfuric acid plant. Add 8kg of pickling waste sludge to 100L of arsenic-containing waste acid, stir for 20min, then slowly add 800mL of industrial hydrogen peroxide (concentration: 27.5wt%), add 1.75kg of quicklime (purity: 90wt%), adjust the pH to 3-4, expose Gas 2h. After the aeration is over, add 0.61kg of liquid caustic soda, adjust the pH value to 7.5, precipitate, and filt...

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Abstract

The invention belongs to the field of environmental protection, and particularly relates to a method for treating arsenic-containing waste polluted acid by using industrial iron-containing waste mud.The method comprises: pouring industrial iron-containing waste mud into arsenic-containing waste polluted acid, promoting the uniform mixing and the reaction between the industrial iron-containing waste mud and the arsenic-containing waste polluted acid through stirring or aeration, adjusting the pH value to 6-9 with an alkali, entering a precipitation pool, carrying out standard discharge on thesupernatant, dewatering the concentrated sludge by using a press filter or a centrifuge, and treating the dewatered concentrated sludge as solid waste. According to the present invention, the use amount of the industrial iron-containing waste mud is determined through the test according to the components and the treatment requirements of the arsenic-containing waste polluted acid; with the method,the iron-containing solid waste in the iron and steel industry and the aluminum industry can be directly utilized, and the arsenic-containing waste polluted acid problem generally existing in the non-ferrous smelting, the industrial sulfuric acid and other industries can be solved; and the method has advantages of simple process, easy operation, good arsenic removal effect, iron salt addition eliminating, alkali consumption reducing, effectively-reduced solid waste treatment pressure, resource saving, cost reducing and high practical value.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a method for treating arsenic-containing waste sewage acid by utilizing industrial iron-containing waste mud. Background technique [0002] Iron and steel products usually need to be cleaned with strong acid (mainly hydrochloric acid, sulfuric acid, mixed acid, etc.) in the process of processing to remove the scale on the surface of the workpiece. When the iron ion in the acid solution reaches a certain concentration, it will cause its corrosion and cleaning effect to decline significantly, and finally become waste acid. According to statistics, the annual output of pickling waste acid in my country's iron and steel industry is more than 10 million tons, and an average of 1 ton of pickling waste acid is processed to produce 250-350 kg of iron-containing waste pickling sludge. Therefore, the annual production of iron-containing waste sludge in the pickling proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10
CPCC02F1/66C02F9/00C02F11/122C02F11/127C02F2001/007C02F2101/103
Inventor 徐正超闵学刚方峰马聪骆凯翔杨炜沂钱红兵李琦黄卫平
Owner ZHANGJIAGANG GREEN TECH ENVIRONMENTAL PROTECTION EQUIP
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