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A method for removing thallium in high-halogen-containing polluted acid wastewater

A kind of sewage acid wastewater and halogen-containing technology, which is applied in the fields of metallurgical wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of excessive and complicated process and high cost of electrochemical treatment, and achieve low treatment cost and low thallium content The effect of stable compliance and simple process flow

Active Publication Date: 2021-05-11
HUNAN SHUI KOU SHAN NONFERROUS METALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process of this method is too complicated, the wastewater treatment cycle is long, and the cost of electrochemical treatment is high, so it is not suitable for the treatment of large-scale industrial sewage acid wastewater

Method used

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  • A method for removing thallium in high-halogen-containing polluted acid wastewater
  • A method for removing thallium in high-halogen-containing polluted acid wastewater

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Embodiment 1

[0024] The present invention is a method for removing thallium in polluted acid wastewater containing high halogen, comprising the following steps: polluted acid wastewater from lead smelting in a certain place in Hunan, the main components in the polluted acid wastewater are Tl 17.36mg / L, F 2.87g / L, and Cl 5.32g / L,H 2 SO 4 35.6g / L, using such as figure 1 The present invention shows a method for removing thallium in polluted acid wastewater with high halogen content to treat it, (1) defluorination treatment: slowly add calcium carbonate to the polluted acid wastewater and detect the pH, and control the pH in the wastewater at the end point value of 1.83, after stirring and reacting for 30 minutes, a diaphragm filter press was used to perform a stage of pressure filtration to obtain a stage of pressure filtration liquid and a stage of slag with a water content of 26.7%; (2) primary oxidation: add heptahydrate to the stage of pressure filtration liquid Ferrous sulfate and hy...

Embodiment 2

[0030] The present invention is a method for removing thallium in polluted acid wastewater containing high halogen, comprising the following steps: polluted acid wastewater from lead smelting in a certain place in Hunan, the main components in the polluted acid wastewater are Tl 5.81mg / L, F 3.22g / L, and Cl 4.85g / L,H 2 SO 4 43.8g / L, using such as figure 1The present invention shows a method for removing thallium in polluted acid wastewater with high halogen content to treat it, (1) defluorination treatment: slowly add calcium carbonate to the polluted acid wastewater and detect the pH, and control the pH in the wastewater at the end point value of 1.38, after stirring for 30 minutes, use a diaphragm filter press to perform a stage of pressure filtration to obtain a stage of filter press filtration and a stage of slag with a moisture content of 24.3%; (2) Primary oxidation: add sulfuric acid heptahydrate to the stage of pressure filtration liquid Ferrous and hydrogen peroxid...

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Abstract

A method for removing thallium in high-halogen-containing polluted acid wastewater, comprising the following steps: (1) performing defluorination treatment; (2) oxidation treatment; (3) sulfurization treatment; the process of the invention is simple and the treatment cost is low, and is suitable for It is used for the removal of thallium in large-scale industrial high-halogen-containing polluted acid wastewater, and the removal rate of thallium is over 99.9%. The waste residue generated during the treatment process does not contain heavy metal ions and can be treated as general solid waste. The content of thallium in the treated wastewater is stable Up to standard.

Description

technical field [0001] The invention relates to the technical field of sewage acid wastewater treatment, in particular to a method for removing thallium in highly halogen-containing sewage acid wastewater. Background technique [0002] In industries such as metal smelting production, metal electrolysis and flue gas acid production, smelting flue gas contains a large amount of SO 2 As well as some harmful metal components, most smelters have built two-to-two-suction acid production systems to realize smoke and dust recovery and SO 2 Sulfuric acid is produced, but in this process, a large amount of strongly acidic wastewater containing heavy metals will be produced, referred to as dirty acid. [0003] Among them, the treatment of lead smelting acid wastewater has always been a big problem, mainly because it contains more halogen ions, such as fluorine, chlorine, etc., and thallium exists in the acid wastewater. + and Tl 3+ Two forms, among them, Tl 3+ It has a strong coord...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/20C02F103/16
CPCC02F1/001C02F1/5236C02F1/66C02F1/722C02F9/00C02F2101/20C02F2103/16C02F2301/08
Inventor 付高明付绸琳陈国兰白成庆
Owner HUNAN SHUI KOU SHAN NONFERROUS METALS GRP