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Zero emission treatment method of completely turning chromium-containing waste liquor into useable resources.

A treatment method and resource-recycling technology, which is applied in the field of zero-discharge treatment of all chromic waste liquids, can solve problems such as groundwater and surface water pollution, and achieve the effects of reducing treatment costs, simple equipment, and strong process versatility.

Inactive Publication Date: 2010-01-06
刘文治 +2
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Problems solved by technology

Therefore, the harm of heavy metals to the environment still exists for a long time, often causing pollution to groundwater and surface water, and the treatment of this pollution often requires a more expensive price

Method used

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  • Zero emission treatment method of completely turning chromium-containing waste liquor into useable resources.

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Embodiment Construction

[0019] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods without specific conditions indicated in the following examples are usually in accordance with conventional conditions, or in accordance with the conditions suggested by the manufacturer, unless otherwise specified.

[0020] The embodiment is described in conjunction with the process flow of the accompanying drawings.

[0021] The chromium-containing waste liquid is pumped from the storage tank to the reaction tank, and at the same time, the ammonia water with a concentration of 15% by weight is pumped from the ammonia water storage tank to the reaction tank, and the pH is adjusted to 7 with an automatic pH value controller to control the amount of ammonia water added. After reacting at room temperat...

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Abstract

The invention relates to a zero emission treatment method of completely turning chromium-containing waste liquor into useable resources. In the method, first enabling chromium-containing waste liquor to react with ammonia water to form ammonium chromate crystallized sediment; using sulphuric acid liquid to adjust pH value of mother liquor, then adding lime cream alkaline liquor to carry out neutralization reaction to generate cocrystallized sediment of calcium chromate and calcium sulphate; solid-liquid separating the liquid part and the sediment part; drying and dewatering the sediment part to obtain chrome yellow; adding ferrous sulphate to the liquid part to react and then carrying out atmospheric oxidation and solid-liquid separation to obtain the sediment part which is ferrite; carrying out filtration, concentration and cooling crystallization to respectively generate sodium sulphate crystallization and ammonium sulphate crystallization and then carrying out solid-liquid separation; drying and dewatering the sediment part and recovering the sodium sulphate and ammonium sulphate; mixing the liquid part and the liquid part before reverse osmosis membrance is filtered and then treating the mixture in recycling manner. The method of the invention not only features good commonality but also treats various conventional chromium-containing waste liquor; in addition, the method features easily controlled process conditions, simple equipment, easy realization of large-scale production, reduction of treatment cost, thus being a technology featuring reduction and decontamination for treating chromium-containing waste liquor as a usable resource.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a zero-discharge treatment method for all resourceful chromium-containing waste liquids. Background technique [0002] The electroplating industry is an important processing industry in my country. At present, it is mainly galvanized, copper-plated, nickel-plated and chrome-plated, and it is concentrated in the industrial fields of machine manufacturing, light industry, electronics, aerospace and instrumentation. According to incomplete statistics, the national electroplating industry discharges about 400 million tons of wastewater containing heavy metals every year, leading to serious pollution of rivers, lakes and seas. Chromium-containing compounds in electroplating chromic acid waste liquid are national first-class hazardous wastes. In addition, electroplating companies do not have professional technology and special equipment for simple treatment, resulting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F9/04C02F1/52C02F1/44C02F101/22
Inventor 宋荟刘文治
Owner 刘文治
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