Method of obtaining nontoxic gypsum product and high-arsenic waste residue from contaminated sulfuric acid

A technology of sulfuric acid and gypsum, applied in chemical instruments and methods, calcium/strontium/barium sulfate, water pollutants, etc., can solve the problem of inability to adjust the type and dosage of chemicals, no gypsum arsenic leaching toxicity analysis, poor fluctuation resistance, etc. problems, to achieve the effect of facilitating the stabilization of arsenic slag or resource utilization, strong anti-fluctuation, and strong volatility

Active Publication Date: 2017-02-22
湖北金润德环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the content of arsenic in the gypsum produced by the inventive method is lower than 0.1%, the leaching toxicity of gypsum arsenic is not analyzed, and the type and dosage of the medicament cannot be adjusted according to the change of the wastewater quality, and the fluctuation resistance is poor

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  • Method of obtaining nontoxic gypsum product and high-arsenic waste residue from contaminated sulfuric acid
  • Method of obtaining nontoxic gypsum product and high-arsenic waste residue from contaminated sulfuric acid
  • Method of obtaining nontoxic gypsum product and high-arsenic waste residue from contaminated sulfuric acid

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Embodiment 1

[0049] In this embodiment, the sulfuric acid polluted acid discharged from the sulfuric acid workshop of a certain copper smelter in Hubei is used as the treatment object. The molar concentration of hydrogen ions is 1.42 mol / L, the concentration of sulfate ions is 0.86 mol / L, and the arsenic content is 6.36 g / L.

[0050] A kind of method that obtains nontoxic gypsum product and high-arsenic waste residue from sulfuric acid polluted acid described in the present embodiment, its steps are as follows:

[0051] (1) Removal of sulfate: add 20wt% calcium carbonate suspension and 5.1wt% calcium chloride solution mixed solution to 1L (about 1.01kg) sulfuric acid dirty acid, adjust pH to 1.8, centrifuge after reacting for 0.5h, Obtain gypsum crude product and filtrate A;

[0052] The particle diameter of described calcium carbonate is 300-350 order;

[0053] The consumption of described calcium carbonate is 70g, and the consumption of calcium chloride is 18g, and the output of gypsum ...

Embodiment 2

[0084] In this embodiment, the sulfuric acid polluted acid discharged from the sulfuric acid workshop of a copper smelter in Gansu is used as the treatment object. The molar concentration of hydrogen ions is 0.96 mol / L, the concentration of sulfate ions is 0.75 mol / L, and the arsenic content is 12.9 g / L.

[0085] A kind of method that obtains nontoxic gypsum product and high-arsenic waste residue from sulfuric acid polluted acid described in the present embodiment, its steps are as follows:

[0086] (1) Removal of sulfate radical: add 18wt% calcium carbonate suspension and the mixed solution of 13.6wt% calcium chloride solution to 1L (about 1.01kg) sulfuric acid dirty acid, adjust pH to 1.7, centrifuge after reaction 0.5h, Obtain gypsum crude product and filtrate A;

[0087] The particle diameter of described calcium carbonate is 300-350 order;

[0088] The consumption of described calcium carbonate is 45g, and the consumption of calcium chloride is 34g, and the output of gypsu...

Embodiment 3

[0101] In this embodiment, the sulfuric acid polluted acid discharged from the sulfuric acid workshop of a copper smelter in Anhui is used as the treatment object. The molar concentration of hydrogen ions is 1.0 mol / L, the concentration of sulfate ions is 0.56 mol / L, and the arsenic content is 9.3 g / L.

[0102] A kind of method that obtains nontoxic gypsum product and high-arsenic waste residue from sulfuric acid polluted acid described in the present embodiment, its steps are as follows:

[0103] (1) The removal of sulfate radical: add the mixed solution of 22wt% calcium carbonate suspension and 8.1wt% calcium nitrate solution to 1L (about 1.01kg) sulfuric acid dirty acid, adjust pH to 1.5, centrifuge after reaction 0.5h, get Gypsum crude product and filtrate A;

[0104] The particle diameter of described calcium carbonate is 300-350 order;

[0105] The consumption of described calcium carbonate is 46g, and the consumption of calcium nitrate is 17g, and the output of gypsum ...

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Abstract

The invention belongs to the technical field of industrial sewage treatment, and particularly discloses a method of obtaining a nontoxic gypsum product and high-arsenic waste residue from contaminated sulfuric acid. The method includes following steps: 1, enabling mixed liquid of a calcium carbonate suspension and an adjuster solution to react with the contaminated sulfuric acid, centrifugally filtering to obtain a gypsum coarse product of 10-40 mg/L in arsenic leaching concentration and arsenic-containing filtrate, and using sulfuric acid with pH of 1.5-3.0 for secondary water washing of the gypsum coarse product to obtain nontoxic gypsum; 2, using a lime milk solution of 10 wt% for tertiary neutralizing arsenic removal of the filtrate A to obtain high-arsenic waste residue, wherein arsenic content in clear liquid 3 obtained after tertiary neutralizing is lower than 0.3 mg/L; 3, using concentrated sulfuric acid to adjust pH of the clear liquid 3 to 6.0-9.0 for emission. The method is low in treatment cost, simple in operation condition and high in fluctuation resistance, nontoxic gypsum and the high-arsenic waste residue can be obtained, export sales of gypsum and increasing of arsenic content in high-arsenic residue are facilitated, and total amount of dangerous waste is lowered.

Description

technical field [0001] The invention relates to the technical field of industrial sewage treatment, in particular to a method for obtaining non-toxic gypsum products and high-arsenic waste residues from sulfuric acid polluted acid. The method of the invention is suitable for applications with high arsenic content, low acidity and high sulfate ion concentration Sulfuric acid treatment. Background technique [0002] Along with economic development, my country's sulfuric acid industry has developed rapidly, and its raw material composition, device scale, and pollution control level have undergone great changes. The proportion of sulfuric acid produced from smelting flue gas has exceeded 30%. In the flue gas washing process of producing sulfuric acid from smelting flue gas, a large amount of acidic wastewater will be generated, referred to as sulfuric acid for short. This type of wastewater is highly volatile with extremely high concentrations of hydrogen ions, arsenic and sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01F11/46
CPCC01F11/46C02F1/38C02F1/58C02F1/66C02F9/00C02F2101/101C02F2101/103C02F2209/06C02F2301/08
Inventor 杜冬云杜颖杜亚光
Owner 湖北金润德环保技术有限公司
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