Technology for realizing zero discharge of waste water caused by white carbon black production

Abstract

The invention discloses a technology for realizing zero discharge of waste water caused by white carbon black production. The technology is characterized by comprising the steps: 1, firstly, filtering the waste water caused by white carbon black production by a ceramic membrane to obtain ceramic membrane dialyzate and ceramic membrane concentrated liquid; 2, carrying out plate-frame pressure filtration on the ceramic membrane concentrated liquid to obtain filter residue which is silicon dioxide, recycling the silicon dioxide, enabling filter press water to enter a collecting tank and carrying out circulating treatment on the filter press water; 3, carrying out primary nanofiltration on the ceramic membrane dialyzate, collecting primary nanofiltration concentrated liquid to obtain sodium sulfate concentrated liquid, and carrying out evaporation and concentration to obtain sodium sulfate; and 4, carrying out primary reverse osmosis on primary nanofiltration dialyzate to obtain primary reverse osmosis dialyzate and primary reverse osmosis concentrated liquid, and carrying out evaporation and concentration on the primary reverse osmosis concentrated liquid to obtain sodium sulfate, wherein the primary reverse osmosis dialyzate is produced water and is recycled for white carbon black production. The technology has the beneficial effects that the operation cost is low; inorganic salts and water resources can be recycled, and zero discharge and a win-win situation of environmental protection benefit and economic benefit can be realized.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a process for zero discharge of white carbon black production wastewater. Background technique [0002] In the prior art, the production methods of white carbon black are mainly two types of precipitation method and gas phase method according to the data at home and abroad. Because the raw materials used in the precipitation method are cheap and easy to obtain, the production process and equipment are relatively simple, and the product price is low, so it currently occupies a dominant position. [0003] The precipitation method is also called the wet method, and the main raw materials are quartz sand, soda ash, industrial hydrochloric acid or sulfuric acid or nitric acid or carbon dioxide. The process route is generally as follows: first use fuel oil or high-quality coal to react quartz sand with soda ash at high temperature to produce industrial water glass, and then make indust...

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Problems solved by technology

[0004] In the process of producing white carbon black, a large amount of press filter mother liquor, filter cake washing water, washing equipment and surface water are discharged. The waste water is acidic (pH=5-7). The existing treatment process is mainly by adding a large amount of limestone Neutralization produces a large amount of solid waste, and the supernatant is discharged after simple treatment. It also contains a large amount of sodium sulfate, which has a serious impact on the environment

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