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Method for treating fluorine ions and chlorine ions in acidic wastewater solution

A technology for acidic wastewater and chloride ions, which is used in filtration treatment, chemical instruments and methods, heating water/sewage treatment, etc.

Inactive Publication Date: 2019-09-03
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the above problems, the present invention provides a method for treating fluoride and chloride ions in acidic waste water solution, which creatively uses submerged combustion technology for solution evaporation and concentration, and then utilizes the difference in solubility for precipitation and separation, which solves the problem of waste water, waste acid The technical problems of difficult treatment of non-metallic heteroions such as fluorine and chlorine and high energy consumption

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  • Method for treating fluorine ions and chlorine ions in acidic wastewater solution
  • Method for treating fluorine ions and chlorine ions in acidic wastewater solution

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Embodiment 1

[0025] The indicators of the acidic wastewater solution selected in this embodiment are as follows: the fluoride ion concentration is 80 mg / L, and the chloride ion concentration is 700 mg / L. This acidic waste water solution is carried out the processing of following steps:

[0026] (1) Take 100L of acidic wastewater solution, and use a plunger metering pump to introduce it from the middle to the submerged combustion evaporator at a flow rate of 10L / min. After the solution is introduced, methane and air are mixed at a volume ratio of 1:12, then introduced into the submerged combustion evaporator at a flow rate of 100L / min, and the igniter is turned on for ignition and combustion. The heat generated by combustion is in direct contact with the acidic wastewater solution to evaporate and concentrate it, and the fluorine and chloride ions are in the form of HF and HCl gas and the H generated after combustion 2 O, O 2 , N 2 , CO 2 It is drawn from the upper part of the evaporato...

Embodiment 2

[0031] The wastewater used in this embodiment has a fluoride ion concentration of 800 mg / L and a chloride ion concentration of 7000 mg / L. Do the following steps:

[0032] (1) Take 100L of the above-mentioned acidic wastewater solution and introduce it from the middle part into the submerged combustion evaporator with a pump at a speed of 10L / min. Dimethyl ether and pure oxygen are introduced into the submerged combustion evaporator with a volume ratio of 1:6 and a flow rate of 100L / min, and the igniter is turned on for ignition and combustion. The heat generated by combustion is in direct contact with the acidic wastewater solution to evaporate and concentrate it, and the fluorine and chloride ions are in the form of HF and HCl gas and the H generated after combustion 2 O, O 2 , N 2 , CO 2 It is drawn from the upper part of the evaporator to the acid-base neutralization tower. The concentrated acidic solution is drawn from the bottom of the burner to the recovery unit. A...

Embodiment 3

[0036] The wastewater used in this embodiment has a fluoride ion concentration of 4800 mg / L and a chloride ion concentration of 10000 mg / L. Do the following steps:

[0037] (1) Take 100L of the above-mentioned acidic wastewater solution and introduce it from the middle part into the submerged combustion evaporator with a pump at a speed of 10L / min. Introduce butane and air into the submerged combustion evaporator with a volume ratio of 1:4 and a flow rate of 100L / min, and turn on the igniter for ignition and combustion. The heat generated by combustion is in direct contact with the acidic wastewater solution to evaporate and concentrate it, and the fluorine and chloride ions are in the form of HF and HCl gas and the H generated after combustion 2 O, O 2 , N 2 , CO 2 It is drawn from the upper part of the evaporator to the acid-base neutralization tower. The concentrated acidic solution is drawn from the bottom of the burner to the recovery unit. After testing, the fluori...

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Abstract

The invention relates to a method for treating fluorine ions and chlorine ions in an acidic wastewater solution. The method comprises: carrying out evaporation concentration, wherein an acidic wastewater solution containing fluorine ions and chlorine ions is introduced into a submerged combustion evaporator, the acidic wastewater solution is subjected to evaporation concentration by using combustion hot flue gas, and the fluorine ions and the chlorine ions are taken out in the forms of gases of HF and HCl; carrying out acid-alkali neutralization, wherein the HF, the HCl and other gases evaporated in the previous step are introduced into an acid-alkali neutralization tower, and an alkaline solution downward sprayed by the tower top and the rising gases of HF and HCl are subjected to countercurrent contact so as to be neutralized, such that a fluoride salt solution and a chlorate solution are converted; and introducing the fluoride salt solution and the chlorate solution obtained by theacid-alkali neutralization tower into a fluorine-chlorine separation tower, and carrying out re-crystallizing separation based on the difference in solubility between fluorine and chlorine to obtaina solid fluoride and a chloride. According to the present invention, the method has advantages of simple process, convenient operation and low processing cost, and can solve the to-be-solved problemsof difficult treatment of fluorine ions and chlorine ions in acidic wastewater, high energy consumption of multi-effect evaporation, and the like in the current metallurgical industry are solved.

Description

technical field [0001] The invention relates to the technical field of waste treatment, in particular to a method for treating fluoride and chloride ions in acidic waste water solution. Background technique [0002] With the development of modern technology and economy and the progress of human society, industrial development is in full swing, which also brings problems of industrial wastewater and waste acid discharge treatment. The non-ferrous metallurgical industry is an important source of waste water and waste acid. Due to the wide variety of non-ferrous metals, the texture and source of ore raw materials for metal production vary widely, and the metallurgical technology is different. Waste water and waste acid contain a large amount of suspended solids and heavy metal ions , fluorine and chloride ions and other pollutants, so the treatment and recycling of nonferrous metallurgical wastewater and waste acid are of great significance to the environment, human body and so...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/02C01D3/04C02F101/14C02F101/12
CPCC02F9/00C01D3/02C01D3/04C02F2101/14C02F2101/12C02F1/04C02F1/66C02F1/001
Inventor 李天文孙晓辉贺勇夏尚文杨国举
Owner YANTAI UNIV
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