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Chlor alkali production waste acid recycling method

A technology of acid recovery and chlor-alkali, which is applied in the direction of neutralization water/sewage treatment, etc., can solve problems such as waste of resources, achieve the effects of reducing treatment costs, improving comprehensive utilization, and saving consumption

Inactive Publication Date: 2016-03-23
HENAN YONGYIN CHEM IND CO LTD
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Problems solved by technology

[0005] However, when the reagent hydrochloric acid plant produces high-purity hydrochloric acid, it will produce a part of acid-containing wastewater with a pH of 1-3. This part of waste acid water is generally neutralized with caustic soda to a pH of 6-9 before it can be discharged or recycled. Therefore, it consumes about 0.3 tons of caustic soda with a mass fraction of 32% is a waste of resources; at the same time, in the production process, the circulating water system needs to discharge sewage in order to ensure stable water quality, and the scale inhibitor and slow-release agent added to the circulating water system adopts an all-organic formula, so The pH of the circulating water operates under alkaline conditions between 8.5 and 9.3, and the sewage is also alkaline

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[0014] Chlor-alkali production waste acid recycling method provided by the invention, such as figure 2 As shown, the waste acid water produced by the chlor-alkali production reagent hydrochloric acid plant and the alkaline sewage of the circulating water system are jointly discharged into the waste water pool and mixed for neutralization. The pH of the waste acid water is 1-3, and the discharge volume is 2m 3 / h or so, the pH of the sewage from the circulating water system is 8.5-9.3, and the discharge volume is 20m 3 / h, the mixing mass ratio of the two is 1: (9-11), the pH after mixing and neutralization is 7-8, the content of mineral ions such as Ca, Mg and Na in the waste water after neutralization is high, and the content of impurities such as suspended solids is relatively high Therefore, it can replace the primary water and send it to the salt well for brine extraction, reducing the primary water consumption; further, the method of sending the neutralized wastewater i...

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Abstract

A chlor alkali production waste acid recycling method comprises the following steps: waste acid water generated by a chlor alkali production reagent hydrochloric acid apparatus is mixed with alkaline circulating water system blow-off sewage, obtained wastewater is neutralized, and neutralized wastewater is conveyed to a salt well to carry out brine mining. The waste acid water is neutralized by using circulating water blow-off sewage, so the use amount of caustic soda is saved, the treatment cost of the waste acid water is reduced, and the comprehensive utilization rate of the waste acid water is improved.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a method for recycling waste acid water produced by a reagent hydrochloric acid device in chlor-alkali production. Background technique [0002] The chlor-alkali production process in the prior art is generally as follows: the brine produced from the salt well is transported to the primary brine system through the brine pump for crude brine refining, and then pumped to the secondary brine refining and electrolysis section after refining, such as figure 1 As shown, the specific steps are as follows: the coarse brine from the primary brine enters the filtered brine storage tank, and is sent to the ion exchange resin tower through the brine heater by the filtered brine pump, and the trace amount of Ca contained in the brine is eliminated by ion exchange. 2+ , Mg 2+ Wait for the multivalent cation content to reach the specified value ≤ 20wtppb. The secondary refined ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66
CPCC02F1/66
Inventor 郭瑞卿张新士张向锋王汉生王凯
Owner HENAN YONGYIN CHEM IND CO LTD
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