Process for treating high-arsenic and high cadmium waste acid by using three-stage lime-ferric salt method

A treatment process, high arsenic and high cadmium technology, applied in the direction of neutralized water/sewage treatment, oxidized water/sewage treatment, multi-stage water/sewage treatment, etc., can solve the problem of high cadmium content in the treatment object, and the experimental design has not reached industrial application level and other issues, to achieve considerable economic benefits, reduce the amount of slag produced, and reduce toxicity

Inactive Publication Date: 2013-05-29
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the content of cadmium in the treatment object of the present invention is relatively high (130mg/L), and there is no literature reporting the simultaneous removal of high content of cadmium and arsenic
[0007] Some laboratory studies involve the use of continuous segmented iron salts to remove arsenic (Jia, Y, Zhang, D., Pan, R., Xu, L. and Demopoulos, GP., 2012. A novel two-step c

Method used

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  • Process for treating high-arsenic and high cadmium waste acid by using three-stage lime-ferric salt method
  • Process for treating high-arsenic and high cadmium waste acid by using three-stage lime-ferric salt method
  • Process for treating high-arsenic and high cadmium waste acid by using three-stage lime-ferric salt method

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Experimental program
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Embodiment 1

[0048] Treatment object: the sewage acid wastewater discharged from the sulfuric acid workshop of the smelter of Daye Nonferrous Metal Mining Co., Ltd., with a treatment capacity of 30m 3 .

[0049] Influent water quality table:

[0050]

[0051] The processing steps are as follows:

[0052] (1) The first gypsum manufacturing section: Put lime milk into the dirty acid, adjust the pH of the dirty acid to 2, remove most of the sulfuric acid in the dirty acid through neutralization reaction, react for 1 hour, and form calcium sulfate precipitation, settle for 1 hour Solid-liquid separation to produce gypsum, as a by-product, has passed the appraisal of Wuhan Mineral Resources Supervision and Testing Center of the Ministry of Land and Resources, and its quality is better than GB / T5483-2008 gypsum standard, which can be used as raw material for cement and other industries;

[0053] (2) The second stage neutralizes and oxidizes the arsenic precipitation section: Add milk of lim...

Embodiment 2

[0062] Treatment object: the sewage acid wastewater discharged from the sulfuric acid workshop of the smelter of Daye Nonferrous Metal Mining Co., Ltd., with a treatment capacity of 30m 3 .

[0063] Influent water quality table:

[0064]

[0065] The processing steps are as follows:

[0066] (1) The first gypsum manufacturing section: Put lime milk into the dirty acid, adjust the pH of the dirty acid to 2, remove most of the sulfuric acid in the dirty acid through neutralization reaction, react for 1 hour, and form calcium sulfate precipitation, settle for 1 hour Solid-liquid separation to produce gypsum, as a by-product, has passed the appraisal of Wuhan Mineral Resources Supervision and Testing Center of the Ministry of Land and Resources, and its quality is better than GB / T5483-2008 gypsum standard, which can be used as raw material for cement and other industries;

[0067] (2) The second stage neutralizes and oxidizes the arsenic precipitation section: Add milk of lim...

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Abstract

The invention relates to the technical field of processes for treating acidic arsenic-contained wastewater discharged by non-ferrous smelting and sulfuric acid industries and particularly discloses a process for treating high-arsenic and high cadmium waste acid by using a three-stage lime-ferric salt method. The process comprises the following three stages: firstly, gypsum manufacture: adding lime to adjust the pH value to 2, and carrying out solid-liquid separation to obtain gypsum slag, wherein the gypsum slag can be used for manufacturing cement; secondly, neutralization, oxidation and arsenic sedimentation: adding lime into a supernatant liquid, adjusting the pH value to 5-6, adding ferrous sulfate according to the ferrum-to-arsenic ratio of 4:1, continuously aerating, adding anionic polyacrylamide for coagulation, and removing most of arsenic; and thirdly, neutralization and coagulation: adding lime to adjust the pH value to 9, adding ferrous sulfate according to the ferrum-to-arsenic ratio of 4:1, continuously aerating, adding anionic polyacrylamide for coagulation, and removing residual arsenic and heavy metal ions. After wastewater with the highest arsenic concentration of 14740mg/L and the highest cadmium concentration of 130mg/L is treated by using the process, the concentration of arsenic in the wastewater is reduced to 0.25g/L, no cadmium is found, and therefore, the wastewater achieves the national discharge standard.

Description

technical field [0001] The present invention relates to the technical field of treatment process for wastewater discharged from the non-ferrous smelting industry, in particular to a process for treating polluted acid containing high arsenic and high cadmium by a three-stage lime iron salt method, which is suitable for high arsenic, high cadmium and various heavy metals Treatment of ionic high-acid wastewater. Background technique [0002] A large amount of high-concentration acidic wastewater containing heavy metals such as arsenic and cadmium is produced in the process of non-ferrous metal smelting and mineral processing, which is called dirty acid in the industry. Polluted acid has the characteristics of complex composition, strong toxicity, and great difficulty in treatment. If the wastewater is not treated up to standard, it will cause serious environmental pollution and destroy the ecological environment (Mandal, B.K. and Suzuki, K.T., 2002.Arsenic round the world: a r...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01F11/46C02F1/66C02F1/72C02F1/56C02F101/10C02F101/20
Inventor 杜冬云曹龙文李敦顺崔洁
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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