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Recycling method and equipment of waste red gypsum of titanium white factory

A titanium dioxide factory, red gypsum technology, applied in the direction of titanium compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of troublesome processing, increase of chemical reagents, complex production process, etc., to achieve resource saving, simple process steps, high granularity even size effect

Inactive Publication Date: 2017-12-08
广西藤县广峰钛白有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inventors found that the recovery and utilization of red gypsum in the above-mentioned disclosed patent 2 and patent 3 must be processed by adding an oxidizing agent and a reducing agent. To a certain extent, chemical reagents will be added, which will bring troubles to subsequent processing

Method used

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  • Recycling method and equipment of waste red gypsum of titanium white factory
  • Recycling method and equipment of waste red gypsum of titanium white factory

Examples

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Effect test

Embodiment 1

[0032] A method for recycling red gypsum, which is waste from a titanium dioxide factory, processes acid waste water produced in the process of producing titanium dioxide by a sulfuric acid method, and recycles red gypsum; specifically comprises the following steps:

[0033] (1) In the process of producing titanium dioxide by the sulfuric acid method, the ilmenite and concentrated sulfuric acid are subjected to acidolysis reaction and separated to obtain titanyl sulfate, which is hydrolyzed to generate metatitanic acid, and then press-filtered to obtain solid metatitania Acid and acid wastewater;

[0034] (2) Add 50-mesh limestone to the acid wastewater, neutralize the pH value of the solution to 3, then add lime water to neutralize the pH value of the solution to 6, use a pump to pump the solution into the dense pool, stand for separation, and obtain sludge slurry and sewage;

[0035] (3) After the sewage has passed the inspection, it is directly discharged or reused, and th...

Embodiment 2

[0041] A method for recycling red gypsum, which is waste from a titanium dioxide factory, processes acid waste water produced in the process of producing titanium dioxide by a sulfuric acid method, and recycles red gypsum; specifically comprises the following steps:

[0042] (1) In the process of producing titanium dioxide by the sulfuric acid method, the ilmenite and concentrated sulfuric acid are subjected to acidolysis reaction and separated to obtain titanyl sulfate, which is hydrolyzed to generate metatitanic acid, and then press-filtered to obtain solid metatitania Acid and acid wastewater;

[0043] (2) Add 100-mesh limestone to the acidic wastewater, neutralize the pH value of the solution to 3-4, then add lime water to neutralize the pH value of the solution to 6-9, use a pump to pump the solution into the dense pool, and let it stand for separation , to obtain sludge and sewage;

[0044] (3) After the sewage has passed the inspection, it is directly discharged or reu...

Embodiment 3

[0050] A method for recycling red gypsum, which is waste from a titanium dioxide factory, processes acid waste water produced in the process of producing titanium dioxide by a sulfuric acid method, and recycles red gypsum; specifically comprises the following steps:

[0051] (1) In the process of producing titanium dioxide by the sulfuric acid method, the ilmenite purchased from the mine is put into the reaction kettle, and concentrated sulfuric acid with a mass concentration of 98% is added, and water is added to initiate the reaction to obtain the product; cooling, filtering Remove the dust and ore to obtain titanium liquid; put the titanium liquid into the vacuum refrigerated centrifuge, and then adjust the vacuum degree of the vacuum refrigerated separator, ferrous sulfate crystallizes, and centrifuges to obtain ferrous sulfate heptahydrate crystals and titanyl sulfate; Lead titanyl sulfate into the hydrolysis tank through the pipeline, boil at the hydrolysis temperature of...

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Abstract

The invention belongs to the technical field of management and comprehensive utilization of three wastes such as waste gas, waste water and waste residues and in particular relates to a recycling method and equipment of waste red gypsum of a titanium white factory. Acidic wastewater generated in a process of producing titanium white by adopting a sulfuric acid method is treated and the red gypsum is recycled; the content of free water in the waste red gypsum is reduced to 15 percent or lower from previous 30 percent to 90 percent by adopting a spraying and drying process, so that the content of the free water in the waste red gypsum is effectively reduced; the requirements of delivering raw materials into a cement factory are met and the grain size is uniform. According to the recycling method of the waste red gypsum of the titanium white factory, provided by the invention, the waste red gypsum can be changed into valuable things and a green chemistry concept is met; the aims of saving resources and comprehensively utilizing are realized and an industrial policy of a sustainable development path of coordination of resource saving and environment protection of China is met; the recycling method and equipment have relatively strong economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the technical field of three wastes treatment and comprehensive utilization, and specifically relates to a method and equipment for recycling red gypsum, which is waste from a titanium dioxide factory. Background technique [0002] Red gypsum is an industrial waste residue with dihydrate gypsum as the main component produced by adding lime (or carbide slag) to neutralize a large amount of acid wastewater in order to treat acid wastewater when the sulfuric acid method is used to produce titanium dioxide. It is the main component of sulfuric acid method titanium dioxide. of industrial waste. Compared with desulfurization gypsum and phosphogypsum, red gypsum has not attracted enough attention from the society. However, in the production process of sulfuric acid titanium dioxide, red gypsum, which is thrown away as industrial waste, is actually a raw material widely used in cement, ceramics, gypsum products and other building mate...

Claims

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Application Information

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IPC IPC(8): C01F11/46C04B11/02C01G23/00
CPCC01F11/46C01G23/00C04B11/02
Inventor 梁忠军覃振锋
Owner 广西藤县广峰钛白有限公司
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