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A method for purifying sewage in the production of sodium fluorosilicate

A sodium fluorosilicate and sewage purification technology, which is applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of increased viscosity of extraction slurry, fouling of filters and blockage of filter cloth , unfavorable rapid filtration of extraction slurry and other problems, to achieve the effect of reducing production cost, reducing usage, and good flocculation

Active Publication Date: 2020-09-08
GUIYANG KAILIN FERTILIZER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

F and SO in this part of sewage 4 2- Entering the extraction system will facilitate the decomposition of phosphate rock powder and reduce the consumption of sulfuric acid. F can be recycled through phosphoric acid extraction or concentrated fluorine absorption system, but SiO 2 and Na + Will adversely affect extraction production, SiO 2 If the content is too high, the viscosity of the extraction slurry will increase, which is not conducive to the rapid extraction reaction and rapid filtration of the extraction slurry. At the same time, it will easily cause fouling of the filter and blockage of the filter cloth. Na + If the content is too high, it will not be conducive to the growth of phosphogypsum into uniform and coarse crystals, and at the same time, it will easily form sodium fluorosilicate crystals, which will cause fouling of the filter and blockage of the filter cloth

Method used

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  • A method for purifying sewage in the production of sodium fluorosilicate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 Shown, a kind of method for sewage purification in the production of sodium fluorosilicate comprises the following steps:

[0028] 1) Regulating Na in sewage + Content: In the preparation process of sodium fluorosilicate, the production process of sodium fluorosilicate was changed, the excessive precipitation method of sodium sulfate was changed to the excessive precipitation method of acid fluorosilicate, the conversion rate of sodium sulfate was improved, and the Na in the sewage of sodium fluorosilicate production was greatly reduced. + Content, Na in sewage + Content <500 mg / L, get sodium fluorosilicate production sewage;

[0029] 2) Flocculant settling: the sewage obtained in step 1) is mixed and reacted with the flocculant in the flocculant mixer, and the reaction liquid enters the separation reactor to remove a part of the suspended matter, and the filtrate 1 is obtained;

[0030] 3) Fly ash mixing: the filtrate 1 obtained in step 1) is mixed ...

Embodiment 2

[0045] Such as figure 1 Shown, a kind of method for sewage purification in the production of sodium fluorosilicate comprises the following steps:

[0046] 1) Regulating Na in sewage + Content: In the preparation process of sodium fluorosilicate, the production process of sodium fluorosilicate was changed, the excessive precipitation method of sodium sulfate was changed to the excessive precipitation method of acid fluorosilicate, the conversion rate of sodium sulfate was improved, and the Na in the sewage of sodium fluorosilicate production was greatly reduced. + Content, Na in sewage + Content <500mg / L, get sodium fluorosilicate production sewage;

[0047] 2) Flocculant settling: the sewage obtained in step 1) is mixed and reacted with the flocculant in the flocculant mixer, and the reaction liquid enters the separation reactor to remove a part of the suspended matter, and the filtrate 1 is obtained;

[0048] 3) Fly ash mixing: the filtrate 1 obtained in step 1) is mixed w...

Embodiment 3

[0063] Such as figure 1 Shown, a kind of method for sewage purification in the production of sodium fluorosilicate comprises the following steps:

[0064] 1) Regulating Na in sewage + Content: In the preparation process of sodium fluorosilicate, the production process of sodium fluorosilicate was changed, the excessive precipitation method of sodium sulfate was changed to the excessive precipitation method of acid fluorosilicate, the conversion rate of sodium sulfate was improved, and the Na in the sewage of sodium fluorosilicate production was greatly reduced. + Content, Na in sewage + Content <500mg / L, get sodium fluorosilicate production sewage;

[0065] 2) Flocculant settling: the sewage obtained in step 1) is mixed and reacted with the flocculant in the flocculant mixer, and the reaction liquid enters the separation reactor to remove a part of the suspended matter, and the filtrate 1 is obtained;

[0066] 3) Fly ash mixing: the filtrate 1 obtained in step 1) is mixed w...

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Abstract

The invention relates to the technical field of sewage treatment, and particularly relates to a sewage purification method during sodium fluosilicate production. The method comprises the steps of adjusting the Na+ content in sewage and conducting flocculant precipitation, flyash mixing and membrane separation. According to the sewage purification method during the sodium fluosilicate production, silicon dioxide removal in the sewage during the sodium fluosilicate production is and a flocculant are researched, finally a composite flocculant is obtained through compounding on the condition of acheap carbon source and nitrogen source, silicon dioxide in the sewage can effectively precipitate, it is found through an experiment that the content of the silicon dioxide in the sewage can reach 4.77 mg / L to the lowest degree after treatment, the using amount of the flocculant is little and reduced, cyclic utilization of workshop production water is achieved, and the production cost is reduced.Besides, the flocculant researched in the method has the same good flocculation effect on sewage in other fields.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for purifying sewage in the production of sodium fluorosilicate. Background technique [0002] The fluorine salt workshop of Guiyang Kailin Chemical Fertilizer Co., Ltd. has 2.5wt(Na 2 SiF 6 ) / a production capacity, sodium fluorosilicate is produced by precipitation method, and sodium fluorosilicate is prepared by synthetic reaction by adjusting the salt ratio with fluorosilicic acid and excess sodium sulfate solution, and 5% of sodium fluorosilicate is generated during the production process of sodium fluorosilicate of dilute sulfuric acid, remove SO in sewage by adding 10% sodium carbonate solution for neutralization reaction 4 2- . During the production of sodium fluorosilicate, about 80-100m 3 / h sewage, the main components of sewage are F, SiO 2 , SO 4 2- and Na + Wait. Among them, the average value of F content is greater than 3000mg / L, SiO 2 Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/34
CPCC02F1/001C02F1/281C02F1/52C02F9/00C02F11/122C02F2103/34C02F2303/14
Inventor 项双龙吴有丽陈彬廖吉星张诚周宾张卫红杨昌勇
Owner GUIYANG KAILIN FERTILIZER CO LTD
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