Advanced treatment process for thallium-containing wastewater

A technology for advanced treatment of waste water, which is applied in the advanced treatment of thallium-containing waste water, metallurgical industrial waste water and metal recovery process waste water, and can solve the problems of reducing agent residue, high treatment cost, and smelly adsorbent, etc. Achieve the effect of reducing the amount of hazardous waste generated, realizing closed loop and reducing treatment costs

Pending Publication Date: 2020-02-11
昆明先导新材料科技有限责任公司
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Problems solved by technology

In the actual production and treatment process, in order to achieve the chromium discharge standard in wastewater, an excessive amount of reducing agent is generally added. At present, more reducing agents are used, such as sodium sulfite, sodium bisulfite, sodium thiosulfate, and ferrous sulfide. or more, which not only leads to high total sulfur content and salt content in wastewater, but also leads to the residue of reducing agent, resulting in an increase in the consumption of oxidant and flocculant in the subsequent oxidation-flocculation-adsorption removal treatment of Tl
In addition, the COD content of wastewater generated during the extraction and recovery of valuable metals is relatively high (about 500ppm), which leads to the COD in the wastewater first consuming the oxidant and then oxidizing thallium during the oxidation of thallium, resulting in the oxidation of thallium The f

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  • Advanced treatment process for thallium-containing wastewater

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Example Embodiment

[0045] Example 1

[0046] An embodiment of the method for advanced treatment of thallium-containing wastewater of the present invention. The wastewater treated in this embodiment is thallium-containing wastewater produced in the valuable metal recovery process of a metallurgical company. ICP-OES and ICP-MS are used to analyze and detect the The concentration of heavy metals results in a thallium content of 5 mg / L and a soluble salt content of 7.3%. The advanced processing method includes the following steps:

[0047] (1) Desalination by evaporation: 30m 3 The pH value of the above wastewater is adjusted to about 7-8, and after filtration, it undergoes evaporation and desalination treatment to obtain wastewater with a salt content of less than 0.005% by weight;

[0048] (2) Chemical oxidation: add sodium hypochlorite solution (sodium hypochlorite used is industrial grade) with a sodium hypochlorite concentration of 10wt% to the wastewater with a salt content of less than 0.005wt% in ...

Example Embodiment

[0051] Example 2

[0052] An embodiment of the method for advanced treatment of thallium-containing wastewater of the present invention. The wastewater treated in this embodiment is thallium-containing wastewater produced in the valuable metal recovery process of a metallurgical company. ICP-OES and ICP-MS are used to analyze and detect the The concentration of heavy metals showed that the thallium content was 8 mg / L and the soluble salt content was 11.2%. The advanced processing method includes the following steps:

[0053] (1) Desalination by evaporation: 30m 3 The pH value of the above wastewater is adjusted to about 8-9, and after filtration, it is subjected to evaporation and desalination treatment to obtain wastewater with a salt content of less than 0.008wt%;

[0054] (2) Chemical oxidation: Add a sodium hypochlorite solution with a sodium hypochlorite concentration of 10% by weight to the wastewater with a salt content of less than 0.008wt% in an amount of 2mL / L (the sodium ...

Example Embodiment

[0057] Example 3

[0058] An embodiment of the method for advanced treatment of thallium-containing wastewater of the present invention. The wastewater treated in this embodiment is thallium-containing wastewater produced in the valuable metal recovery process of a metallurgical company. ICP-OES and ICP-MS are used to analyze and detect the The concentration of heavy metals results in a thallium content of 10 mg / L and a soluble salt content of 5.6%. The advanced processing method includes the following steps:

[0059] (1) Desalination by evaporation: 30m 3 The pH value of the above wastewater is adjusted to about 8-9, and after filtration, it undergoes evaporation and desalination treatment to obtain wastewater with a salt content of less than 0.003 wt%;

[0060] (2) Chemical oxidation: Add a sodium hypochlorite solution with a sodium hypochlorite concentration of 10% by weight to the wastewater with a salt content of less than 0.003wt% in an amount of 2mL / L (the sodium hypochlorite...

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Abstract

The invention provides an advanced treatment process for thallium-containing wastewater, belonging to the technical field of wastewater treatment. According to the invention, evaporation desalination,chemical oxidation, flocculent precipitation and resin adsorption technologies are adopted in a combined manner, so efficient thallium removal and desalination can be synchronously realized and a thallium emission concentration can be stably lower than 2 [mu]g/L, and thud, the method is particularly suitable for treating high-salt thallium-containing wastewater; meanwhile, the consumption of an oxidant and a flocculation precipitant, the generation amount of hazardous wastes and treatment cost in the thallium removal process can be remarkably reduced; in addition, waste acid and waste alkaligenerated in resin backwashing regeneration and transformation can be returned to the treatment process for reutilization so as to achieve reduction; and the wastewater treated through the process canserve as production water or cooling circulating water and be returned to a treatment system for use so as to achieve closed circulation of the production water.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and relates to an advanced treatment method for thallium-containing wastewater, which is particularly suitable for the treatment of thallium in metallurgical industrial wastewater and metal recovery process wastewater. Background technique [0002] Thallium (Tl), which is accumulative, is a typical highly toxic heavy metal element, which is extremely harmful to human health. At present, my country has listed thallium as one of the key pollutants for the comprehensive prevention and control of heavy metal pollution, and the discharge requirements for thallium have become increasingly stringent. In some areas, the discharge standard for Tl in wastewater has reached below 2 μg / L. For related metal smelting, extraction and recovery of valuable metals in solid materials and other chemical industries, the control of trace Tl is becoming increasingly difficult. [0003] Wastewater generated...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/20C02F103/16
CPCC02F9/00C02F2101/20C02F2103/16C02F1/66C02F1/04C02F1/72C02F1/5236C02F1/56C02F1/285C02F1/444
Inventor 秦婷婷邢娜朱刘王权
Owner 昆明先导新材料科技有限责任公司
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