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A method for removing arsenic from sulfuric acid polluted acid wastewater

A technology of polluted acid wastewater and sulfuric acid, applied in chemical instruments and methods, multi-stage water/sewage treatment, calcium/strontium/barium sulfate, etc., can solve the problem of unfavorable resource utilization or stabilization/solidification of arsenic slag, easy to produce toxicity and high Strong hydrogen sulfide gas, a large amount of hazardous solid waste containing arsenic, etc., to achieve the effect of easy resource utilization, convenient follow-up utilization, and good gypsum morphology

Active Publication Date: 2018-07-24
湖北金润德环保技术有限公司
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Problems solved by technology

[0005] The above-mentioned methods all have disadvantages: (1) the lime method or the iron salt method all need to add a large amount of chemical agents; (2) the amount of hazardous solid waste containing arsenic produced is large; (3) the arsenic content in the arsenic-containing slag is low, which is not conducive to Recycling or stabilization / solidification of arsenic slag; (4) Although the sulfidation method can obtain arsenic sulfide slag with high arsenic content, this method can only be carried out under acidic conditions, and it is easy to produce highly toxic hydrogen sulfide gas. The cost is also very expensive; (5) the degree of automation of the treatment process is low, the pH value is not easy to control, and there are more calcium ions in the solution, which may easily cause pipeline blockage, etc.

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  • A method for removing arsenic from sulfuric acid polluted acid wastewater

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Embodiment 1

[0039] In this embodiment, the sulfuric acid polluted waste water discharged from a sulfuric acid workshop of a copper smelter in Daye, Hubei is used as the treatment object. The phenolphthalein acidity is 65g / L, and the arsenic content is 8.8g / L. Adopt the inventive method to carry out processing flow and relevant parameter as follows:

[0040] To treat 1L (about 1.01kg) of sulfuric acid waste water, in the stage of calcium carbonate neutralization, adjust the pH to 1.9 with a calcium carbonate suspension with a mass fraction of 8%, and consume about 66g of calcium carbonate to generate about 90g of gypsum , and the arsenic content is 0.08%, which belongs to non-hazardous waste.

[0041] In the milk of lime neutralization stage, adjusting the pH to 11.9 with 8% milk of lime requires the consumption of about 20g of calcium hydroxide to generate about 30g of arsenic-containing waste residue with an arsenic content of 29.1%, which requires stable solidification. 99.2% of the ar...

Embodiment 2

[0044] In this embodiment, the sulfuric acid waste water discharged from the sulfuric acid workshop of a copper smelter in Tongling, Anhui Province is used as the treatment object. The phenolphthalein acidity is 90g / L, and the arsenic content is 13.7g / L. Adopt the inventive method to carry out processing flow and relevant parameter as follows:

[0045] To treat 1L (about 1.01kg) of sulfuric acid waste water, in the stage of calcium carbonate neutralization, use a calcium carbonate suspension with a mass fraction of 5% to adjust the pH to 1.9, consume about 92g of calcium carbonate, and generate about 124g of gypsum , and the arsenic content is 0.09%, which belongs to non-hazardous waste.

[0046] In the milk of lime neutralization stage, adjusting the pH to 11.9 with 5% milk of lime requires the consumption of about 28g of calcium hydroxide to generate about 46g of arsenic-containing waste residue with an arsenic content of 29.3%, which requires stable solidification. 98.4% o...

Embodiment 3

[0049] In this embodiment, the sulfuric acid waste water discharged from the sulfuric acid workshop of a copper smelter in Guixi, Jiangxi Province is used as the treatment object. The phenolphthalein acidity is 75g / L, and the arsenic content is 3.8g / L. Adopt the inventive method to carry out processing flow and relevant parameter as follows:

[0050] To treat 1L (about 1.01kg) of sulfuric acid waste water, in the stage of calcium carbonate neutralization, adjust the pH to 1.9 with a calcium carbonate suspension with a mass fraction of 6%, and consume about 76g of calcium carbonate to generate about 104g of gypsum , and the arsenic content is 0.05%, which belongs to non-hazardous waste.

[0051] In the milk of lime neutralization stage, adjusting the pH to 11.9 with 7% milk of lime requires the consumption of about 17g of calcium hydroxide to generate about 14g of arsenic-containing waste residue with an arsenic content of 26.7%, which requires stable solidification. 98.6% of ...

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Abstract

The invention belongs to the technical field of industrial wastewater treatment, and particularly discloses a method for removing arsenic from sulfate acidic wastewater. The method comprises the following steps that 1, the sulfate acidic wastewater is neutralized through a calcium carbonate suspension of 5 wt%-8 wt%, and solid-liquid separation is conducted after neutralization is conducted; 2, neutralized filtrate is neutralized again through a lime milk suspension of 5 wt%-8 wt%, solid-liquid separation is conducted, and more than 98% of the arsenic is removed in the process; 3, ferric sulfate or polymeric ferric sulfate flocculent settling is conducted, and flocculent settling is conducted on the filtrate in the second step to remove the residual arsenic. The method for removing the arsenic from the sulfate acidic wastewater is low in treatment cost and simple in operation condition, and the treated wastewater can reach a corresponding national emission standard; meanwhile, high-concentration arsenic residues can be obtained, and resource recycling or stabilizing or curing of the arsenic is facilitated.

Description

technical field [0001] The invention relates to the technical field of industrial sewage treatment, in particular to a method for removing arsenic from sulfuric acid polluted acid wastewater. The method of the invention is suitable for the treatment of wastewater with high arsenic content and high acidity. Background technique [0002] Sulfuric acid is an important raw material in chemical production. It is widely used in agriculture, metallurgy, national defense, textile industry and so on. China has become the country with the highest production capacity, largest output and largest consumption of sulfuric acid in the world. It is worth mentioning that China's sulfuric acid production is expected to reach 100 million tons per year in 2015, of which sulfuric acid produced from smelting flue gas will account for 30%. In the process of smelting flue gas, high-concentration arsenic-containing acidic wastewater is called sulfuric acid wastewater, which is its main pollutant. S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01F11/46C02F101/10
CPCC01F11/46C02F9/00C02F2101/101C02F2101/103C02F2103/18C02F2301/08
Inventor 杜冬云杜颖叶恒朋
Owner 湖北金润德环保技术有限公司
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