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Recycling method of titanium dioxide envelope waste water

A recovery method and technology for titanium dioxide, applied in chemical instruments and methods, titanium dioxide, natural water treatment, etc., can solve the problems of large environmental pollution, unstable quality control, complicated production and control processes, etc., and achieve convenient operation and simple steps. , the effect of improving productivity

Inactive Publication Date: 2018-01-05
四川绿沃创新环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Coated wastewater contains a large amount of titanium dioxide particles, sodium chloride and sodium sulfate. Direct discharge will cause high salinization of water and irreversible salinization of soil, which will cause serious environmental pollution.
At present, the production and control process of reusing coated wastewater is complicated, which makes the quality control in the production process unstable, and the useful substances in the coated wastewater cannot be fully and effectively recycled.

Method used

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Embodiment

[0039] The recovery method of titanium dioxide coated wastewater of the present invention, in order to facilitate the subsequent treatment process, firstly, the coated wastewater is subjected to another coating treatment, that is, the coated wastewater is enriched and polymerized, and the coated slurry can be obtained . Then filter the coated slurry to filter out the titanium dioxide particles, which are the recovered titanium dioxide products. Specifically, a plate and frame filter is first used to filter the coated slurry, and the titanium dioxide particles are filtered out to obtain brine containing titanium dioxide particles. In order to facilitate the subsequent separation, during implementation, this embodiment also uses a filter device with a pore size of 5 μm to filter brine. Then the filtered brine is separated by an ultrafiltration membrane, and the titanium dioxide micropowder with a particle size of 0.1-0.25um is concentrated to obtain 80-100g / L titanium dioxide s...

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Abstract

The invention discloses a recycling method of titanium dioxide envelope waste water. The method is characterized in that the method comprises the following steps of envelope treatment, filtering, separation, envelope concentration, evaporation concentration, and crystallization and drying. The recycling method is easy and convenient to operate, recycling products are titanium dioxide, purified water, sodium sulfate and sodium chloride, accordingly, the productive rate of titanium dioxide can be improved, the purified water, sodium sulfate and sodium chloride can further be recycled, and accordingly waste is turned into wealth; after recycling is completed, waste water is not needed to be discharged, accordingly, the aim of zero discharge can also be achieved, and therefore the method is suitable for application and popularization.

Description

technical field [0001] The invention relates to a wastewater recovery method, in particular to a recovery method of titanium dioxide-coated wastewater. Background technique [0002] my country is one of the main titanium dioxide production countries in the world, and a large amount of coated wastewater will be produced in the production process of titanium dioxide. At present, due to the limitation of technical conditions, except for partial reuse, most of the coated wastewater is directly discharged. Coated wastewater contains a large amount of titanium dioxide particles, sodium chloride and sodium sulfate. Direct discharge will cause high salinization of water and irreversible salinization of soil, which will cause serious environmental pollution. At present, the production and control process of reusing coated wastewater is complicated, which makes the quality control in the production process unstable, and the useful substances in the coated wastewater cannot be fully a...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/04C01D5/00C01G23/047C02F103/34
Inventor 邱全国武长安肖松林邱全伟
Owner 四川绿沃创新环保工程有限公司