Treatment system and method for washing mother liquor for producing titanium dioxide by sulfuric acid method
A treatment system and titanium dioxide technology, applied in ferric sulfate, solution crystallization, general layout of crystallization devices, etc., can solve problems such as inability to realize resource utilization, and achieve the effect of reducing emissions
Active Publication Date: 2022-06-17
HEBEI HUIERXIN NEW MATERIAL
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[0005]
In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a treatment system for the washing mother liquor of titanium dioxide produced by sulfuric acid method, which solves the problem of a large amount of impurity-containing monowater produced in the concentration process of the existing titanium white washing mother liquor. The problem that ferrous sulfate cannot realize resource utilization
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[0035] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below with reference to the accompanying drawings and through specific embodiments.
[0036] like figure 1 As shown in the figure, the schematic diagram of the processing system of the washing mother liquor of titanium dioxide produced by the sulfuric acid method according to the preferred embodiment of the present invention, including sequentially: ferrous dissolution tank 1, frozen crystallization tank 2 (including 2 frozen crystallization tanks in the figure), trypan blue Centrifuge 3, ferrous sulfate heptahydrate packaging machine 4, iron-removing mother liquor tank 5, etc., among them, refrigerated compressor 6 and refrigerated brine tank 7 are also connected with frozen crystallization tank 2.
[0037] The ferrous dissolving tank 1 is provided with a stirring device, and the stirring device includes a stirring paddle 101 and a decelerati...
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The invention relates to a treatment system for washing mother liquor for producing titanium dioxide by a sulfuric acid method. The treatment system comprises a ferrous dissolving tank, a freezing crystallization tank, a cone blue centrifugal machine and an iron removal mother liquor storage tank which are connected in sequence. The method comprises the following steps: firstly dissolving ferrous sulfate monohydrate containing impurities in titanium dioxide primary washing mother liquor in a ferrous dissolving tank to increase the concentration of ferrous sulfate in the solution to a preset value, then reducing the temperature of the ferrous sulfate solution in a freezing crystallization tank through quick freezing to separate out ferrous sulfate in the form of ferric sulfate heptahydrate, and separating out the ferrous sulfate under the temperature condition. And the titanyl sulfate and other metal sulfates such as manganese, magnesium and aluminum are still left in the solution. Then centrifugal separation is carried out in a cone blue centrifuge to obtain ferrous sulfate heptahydrate crystals with the purity larger than or equal to 95%, and the ferrous sulfate heptahydrate crystals serve as products to be output and serve as production raw materials for preparing polyferric sulfate, iron series pigments, ferric phosphate and the like, so that ferrous sulfate monohydrate by-products are recycled, and emission of solid waste in the production process is reduced; the solid waste is subjected to resource utilization.
Description
technical field [0001] The invention relates to an industrial wastewater treatment and resource recovery method, in particular to a treatment system and method for a water-washing mother liquor for producing titanium dioxide by a sulfuric acid method for producing titanium dioxide by a sulfuric acid method. Background technique [0002] Titanium dioxide is a very important inorganic fine chemical product, and it is also the best white pigment in the world. Due to its excellent chemical stability, optical properties and uniform particle size, it is widely used in coatings, paper, plastics, Chemical fiber and other fields. At present, there are two types of titanium dioxide, anatase type and rutile type. There are two production methods: sulfuric acid method and chlorination method. Among them, anatase type titanium dioxide can only be produced by sulfuric acid method. [0003] The production of titanium dioxide by the sulfuric acid method is mainly composed of the following ...
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IPC IPC(8): C01G49/14B01D9/02
CPCC01G49/14B01D9/0013B01D9/0059
Inventor 王归所张永军张志林
Owner HEBEI HUIERXIN NEW MATERIAL