Method for preparing alpha-semi-hydrated gypsum in controllable mode through acid wastewater produced by producing titanium dioxide
A technology of acid wastewater and hemihydrate gypsum, applied in the direction of calcium/strontium/barium sulfate, etc., to achieve the effect of low energy consumption, low cost and controllable particle size
Active Publication Date: 2015-10-21
武汉码沅科技有限公司
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Problems solved by technology
[0006] The technical problem solved by the present invention is to provide a method for the controllable preparation of α-hemihydrate gypsum from the acidic waste water produced in the production of titanium dioxide, which overcomes the fact that the prior art cannot directly use the acidic waste water produced in the production process of titanium dioxide to prepare crystals with a size between Technical problems of α-hemihydrate gypsum with a diameter of 8 μm to 15 μm and an aspect ratio controlled in the range of 0.5 μm to 5.0 μm
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[0015] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.
[0016] Such as figure 1 As shown, the specific embodiment of the present invention is: provide a kind of method that the acidic waste water that produces titanium dioxide is used to produce controllable preparation α-hemihydrate gypsum, comprise the steps: directly the acidic waste water that produces in the titanium dioxide production process is filtered through , remove insoluble impurities, neutralize with soda lime, add gypsum seed crystals in the later stage of the neutralization process to obtain gypsum slurry with a solid content of 8% to 15% and a pH value of 6 to 10, and pump the gypsum slurry Add additives and crystal-transforming agents into the mixing tank and mix, heat the mixed gypsum slurry to 95°C to 100°C, and then pump it into the tubular reactor. Under the pressure condition of 1.0MPa, the continuous crystal transformation reac...
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Abstract
The invention relates to a method for preparing alpha-semi-hydrated gypsum in a controllable mode through acid wastewater produced by producing titanium dioxide. The method comprises the steps that due to the fact that the acid wastewater produced in the titanium dioxide production process is utilized, a specific gypsum seed crystal is added in the late period of the neutralization process, a crystal transformation reaction is conducted by adding an addition agent and a crystal modifier at a certain temperature and pressure, and an alpha-type semi-hydrated gypsum crystallized product of which the diameter and the length-diameter ratio are controllable is obtained, wherein the controllable range for the diameter is 8-15 microns, and the controllable range for the length-diameter ratio is 1:1-1:5. A traditional method that the crystal transformation reaction is conducted by only adding the addition agent and the crystal modifier to prepare an alpha-type semi-hydrated gypsum crystal, and the diameter and the length-diameter ratio are not controllable is changed. According to the method for preparing the alpha-semi-hydrated gypsum in the controllable mode through the acid wastewater produced by producing the titanium dioxide, the granularity of produced products is controllable, the particle size distribution is narrower, and the products can be used for high-strength gypsum product applications;meanwhile, the production process is automatic and continuous, the energy consumption is less, and the cost is low.
Description
technical field [0001] The invention relates to a method for preparing α-hemihydrate gypsum, in particular to a preparation method for directly preparing α-hemihydrate gypsum by using acid waste water produced in the production of titanium dioxide, and controlling the crystal size of the product through technical parameters. Background technique [0002] my country has become the world's largest producer of titanium dioxide, but the titanium dioxide industry has many environmental issues such as three wastes and by-products, most of which cannot be recycled, and is facing the challenges of circular economy and clean production. In particular, the generated titanium dioxide gypsum waste residue cannot be used in large quantities due to the low added value of comprehensive utilization. The treatment is mainly discarded and landfilled, resulting in the occupation of a large amount of land resources and serious environmental pollution. It is urgent to develop high-efficiency res...
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IPC IPC(8): C01F11/46
Inventor 高庆叶旭孟庆前
Owner 武汉码沅科技有限公司