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Resourceful treatment method for inorganic salts in industrial waste water

A treatment method and technology for industrial wastewater, applied in heating water/sewage treatment, alkali metal chloride and other directions, can solve problems such as poor treatment, environmental pollution, damage, etc., achieve outstanding environmental protection and social benefits, reduce environmental pollution, The effect of mature technology

Active Publication Date: 2014-04-09
SHANDONG WEIFANG RAINBOW CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of the invention is simple, and realizes high-purity recovery of inorganic salts in salt-containing industrial wastewater, especially high-salt industrial wastewater, and the obtained inorganic salts can be reused, avoiding resource waste and environmental damage, and solving high The treatment of salt industry wastewater is difficult, but this method still has certain shortcomings, that is, in the process of inorganic salt purification, toxic gases (such as dioxins, etc.) will be produced during the high-temperature carbonization process. These toxic gases are not well treated and discharged into environmental pollution in the air

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take atrazine production wastewater, and evaporate the wastewater through MVR to obtain industrial salt. Take 1000Kg of the industrial salt obtained, detect 90.5% sodium chloride content, 9.00% moisture, and 0.95% TOC, and put it into the tubular pyrolysis reactor , under the isolation of oxygen, thermal cracking at 380°C for 10 minutes, the organic gas produced is passed into the combustion device, and stays at 1000°C for 2 seconds, and the remaining solid is thrown into the rotary kiln, and carbonized at 700°C under oxygen After 15 minutes, high-purity salt is obtained, with a sodium chloride content of 99.92% and a TOC content of 0.004%. The gas produced by carbonization is also passed into the combustion chamber, and is fully combusted at high temperature together with the organic gas from thermal cracking, and the tail gas produced is rapidly cooled to Discharge below 200°C.

[0033] Take 300Kg of high-purity salt obtained in the above steps, and make it into 1000L...

Embodiment 2

[0035] Take the waste water from the production of atrazine, and evaporate the waste water through three-effects to obtain industrial salt. Take 1000Kg of the industrial salt obtained, and detect that the potassium chloride content is 91.8%, the water content is 6.86%, and the TOC is 1.02%. In the middle, under the isolation of oxygen, thermal cracking at 400°C for 8 minutes, the generated organic gas is passed into the combustion device, and stays at 1000°C for 3 seconds, and the remaining solid is thrown into the rotary kiln, and carbonized at 720°C for 30 minutes under oxygen. , to obtain high-purity salt, the content of sodium chloride is 99.96%, the content of TOC is 0.003%, the gas produced by carbonization is also passed into the combustion device, and is fully burned at high temperature together with the organic gas of thermal cracking, and the tail gas produced is quenched to 200 discharge below ℃.

[0036] Take 305Kg of high-purity salt obtained in the above steps, a...

Embodiment 3

[0038] Take simazine production wastewater, evaporate the wastewater through MVR, and obtain industrial salt, take 1000Kg of industrial salt obtained, detect 91.8% sodium chloride content, 7.1% moisture, and 1.06% TOC, and put it into the bubbling fluidized bed reactor In the process, under the isolation of oxygen, thermal cracking at 450°C for 15 minutes, the generated organic gas is passed into the secondary combustion chamber, and stays at 1100°C for 2s, and the remaining solids are thrown into the fluidized bed incinerator, and under the air, Carbonize at 750°C for 10 minutes to obtain high-purity salt. The content of sodium chloride is 99.98%, and the content of TOC is 0.002%. The exhaust gas is rapidly cooled to below 200°C and then discharged.

[0039] Take 310Kg of high-purity salt obtained in the above steps, and make 1000L of brine, and then enter the ion-exchange membrane electrolyzer for electrolysis to obtain liquid caustic soda and chlorine gas, which can be reus...

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Abstract

The invention discloses a resourceful treatment method for inorganic salts in industrial waste water. The method comprises the following steps: evaporating and concentrating waste water to obtain solid salts; carrying out thermal cracking on organic substances in the solid salts into organic gas; introducing the organic gas obtained by thermal cracking into a burning device for full burning, quickly cooling produced tail gas, and exhausting the cooled tail gas; further purifying the thermally-cracked solid salts via high-temperature carbonization to obtain high-purity solid salts, and introducing gas produced by carbonization into the burning device for full burning. According to the method, the flow is simple, the process is mature, industrial utilization is facilitated, and the methd can be applied to treatment of pesticides and even other industrial high-salt waste water. By adopting the method, the purity of the inorganic salts is increased, so that the inorganic salts can be reused. Secondary wastes which are difficult to treat are not produced in a production process, so that waste of resources is reduced, environmental pollution caused by the waste water is lowered, and very good economical and social benefits are achieved.

Description

technical field [0001] The invention relates to a method for resourceful treatment of inorganic salts in industrial wastewater, in particular to a method for resourceful treatment of inorganic salts in pesticide high-salt wastewater. technical background [0002] In the production process of many organic or inorganic chemical products, a large amount of saline wastewater is often produced due to the process requirements, in which the sodium chloride content is higher than 1%, many are more than 10%, and some even reach more than 20%, which is high. The current mature treatment process for salty wastewater and high-salt wastewater is mostly evaporation, which will produce a large amount of by-product waste salt (NaCl). The sodium chloride content of this salt is more than 70%, and it contains a large amount of organic or inorganic impurities. It cannot be directly used as industrial raw material salt, let alone for food or medical use. Most manufacturers pile it up. The long...

Claims

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Application Information

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IPC IPC(8): C02F1/04C01D3/06
Inventor 孙国庆李志清姚红霞侯永生邹宗加凌晓光
Owner SHANDONG WEIFANG RAINBOW CHEM
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