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Fluoride removal method of graphite purification waste water and processing system

A graphite purification and treatment system technology, applied in the field of wastewater defluorination, can solve the problems of unrepresentation, simple wastewater composition, large solid waste output, etc., and achieve the effects of simple implementation, simple process, and high treatment efficiency.

Active Publication Date: 2016-02-24
ZHEJIANG QICAI ECO TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xu Guoqiang's "Research on Fluoride Removal Characteristics of High Fluorine Wastewater" (Hunan Nonferrous Metals, Volume 21, No. 3, 2005) used lime milk-aluminum sulfate two-stage method to treat high-concentration fluoride-containing wastewater, and obtained about 5 mg of fluoride in the effluent / L, but the composition of wastewater used for research in this method is simple and unrepresentative, and new impurities are introduced in the treatment process, resulting in a large amount of solid waste

Method used

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  • Fluoride removal method of graphite purification waste water and processing system
  • Fluoride removal method of graphite purification waste water and processing system

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Experimental program
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Effect test

Embodiment 1

[0070] Graphite purification wastewater, the fluorine content is 2500mg / L, m(NO 3 - ): m(F - ): m(Cl - )=3:1:2 (molar ratio).

[0071] (1) The clear liquid obtained after the above-mentioned waste water is left to settle is entered by the waste water inlet of the dialysis chamber of the diffusion dialysis membrane system, and the diffusion dialysis treatment solution (pretreatment solution) and mixed acid are obtained through the dialysis negative membrane. Use tap water as the absorbing liquid and enter the diffusion chamber to absorb the mixed acid. The dialysis chamber and the diffusion chamber are reversely fed with water. Diffusion dialysis treatment solution is poured into the first neutralization tank, and the mixed acid is recycled to the graphite purification process. The recovery rate of nitric acid was 95%, the recovery rate of hydrochloric acid was 90%, and the recovery rate of hydrofluoric acid was 45%.

[0072] (2) Add bluestone to the above-mentioned first...

Embodiment 2

[0078] Graphite purification waste water, fluorine content is 4000mg / L, m(F - ): m(SO 4 2- )=1:2.5.

[0079] (1) The clear liquid obtained after the above-mentioned waste water is left to settle is entered by the waste water inlet of the dialysis chamber of the diffusion dialysis membrane system, passes through the dialysis negative membrane, and uses tap water as the absorption liquid. Diffusion dialysis treatment solution (pretreatment solution) and mixed acid are obtained. Diffusion dialysis treatment solution is poured into the primary regulating tank, and the mixed acid is recycled to the graphite purification process. It is measured that the recovery rate of sulfuric acid in the waste water is 94%, and the recovery rate of hydrofluoric acid is 40%.

[0080] (2) Add calcium carbonate to the above-mentioned first neutralization tank, stir to adjust the pH to 4, overflow to the primary sedimentation tank and settle for 30 minutes, and the supernatant I overflows into th...

Embodiment 3

[0086] In the step (5) of embodiment 2, the filter tower is filled with a mixed filter material made of 15wt molecular sieve and 85wt WK-1 type filter material, and the waste water passes through the filter tower under the same conditions, and the fluorine content of the treated effluent obtained is 1.7mg / L.

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Abstract

The invention discloses a fluoride removal method of graphite purification waste water and a processing system. The fluoride removal method comprises the step that the graphite purification waste water is subjected to diffusing dialysis, so as to recover acid therein. Diffusing dialysis processing liquid is neutralized and filtered through two steps, and obtained neutralized filter liquor is in contact with a fluoride removal filter material to remove fluoride, so that fluorine content in obtained effluent reaches the standard, and the effluent reaches the effluent standard. The waste water continuously runs in the processing system, and effluent obtained by processing is recycled in the system. By adopting the processing method provided by the invention, through applying the processing system provided by the invention, not only can the fluoride in the waste water can be effectively removed, but also the waste water processing cost can be obviously reduced, the whole system runs stably, and the operation is simple. Continuous and automatic running can be realized.

Description

technical field [0001] The invention relates to a waste water defluorination method, in particular to a treatment method and a treatment system for graphite purification waste water. Background technique [0002] Graphite purification methods mainly include flotation method, alkali acid method, hydrofluoric acid method, chlorination roasting method, and high temperature method. Among them, the hydrofluoric acid method is the easiest to operate and the purified graphite has the highest purity, but hydrofluoric acid is highly toxic and corrosive. Therefore, the researchers tried to purify graphite with mixed acid and found that the effect was better. However, when graphite is purified by hydrofluoric acid purification method and mixed acid purification method, the waste water produced contains a large amount of acid. For example: Purify graphite with mixed acid made by mixing hydrochloric acid and / or sulfuric acid with hydrofluoric acid. The waste water it produces contains...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/06C02F9/10C02F1/66C02F1/28C02F101/14C02F101/12C02F101/16C02F101/20C02F101/10C02F1/44C02F1/02
CPCC02F1/004C02F1/02C02F1/28C02F1/283C02F1/44C02F1/4693C02F1/66C02F9/00C02F2101/10C02F2101/101C02F2101/12C02F2101/14C02F2101/16C02F2101/20C02F2301/08
Inventor 陈磊周小龙张静
Owner ZHEJIANG QICAI ECO TECH CO LTD
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