Chemical chromium waste liquid efficient resourceful treatment process

Abstract

The invention relates to the technical field of chromium waste liquid treatment, in particular to a chemical chromium waste liquid efficient resourceful treatment process which comprises the following steps: S1, pretreatment: collecting and filtering chemical chromium waste liquid to form initial waste liquid; S2, performing reduction; S3, precipitating; S4, performing flocculation; and S5, filtering and collecting: standing and precipitating the flocculation solution obtained in S4, and filtering to realize separation, collection and recovery. According to the method, on the basis of an original chromium waste liquid reduction precipitation method, a filtering step is added before reduction and after precipitation, small solid impurities mixed in chemical waste liquid can be removed through filtering before reduction, the follow-up reduction reaction process is prevented from being influenced, filtering is adopted after precipitation, so that chromium-containing chemicals mixed in the solution can be removed, the treatment effect of the whole chromium-containing waste liquid is improved, the precipitation rate is greatly improved, and the efficient and rapid treatment of the chromium-containing chemical waste liquid can be realized.

Description

technical field [0001] The invention relates to the technical field of chromium waste liquid treatment, in particular to a high-efficiency resource treatment process for chemical chromium waste liquid. Background technique [0002] In most chemical waste liquids, chromium appears in two forms of hexavalent chromium and trivalent chromium in the waste liquid, and hexavalent chromium mainly exists in the form of chromate. In order to reduce the harm, we need to The reduction and precipitation method is a widely used method for the treatment of chromium-containing wastewater, but the main steps of the current reduction and precipitation method are for reduction and precipitation, while ignoring the treatment of waste before reduction and after precipitation. The treatment of the solution leads to incomplete reduction reaction, or the solution after precipitation is still doped with chromium, resulting in poor overall treatment effect. Contents of the invention [0003] The p...

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Problems solved by technology

[0002] In most chemical waste liquids, chromium appears in two forms of hexavalent chromium and trivalent chromium in the waste liquid, and hexavalent chromium mainly exists in the form of chromate. In order to reduce the harm, we need to The reduction and precipitation method is a widely used method for the treatment of chromium-containing wastewater, but the main steps of the current reduction and precipitation method are for reduction and precipitation, while ignoring the treatment of waste before reduction and after precipitation. The treatment of the solution leads to incomplete reduction reaction, or the solution after precipitation is still doped with chromium, resulting in poor overall treatment effect

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