Preparation method of titanium dioxide for polyester chemical fiber extinction

Abstract

The invention discloses a preparation method of titanium dioxide for polyester chemical fiber extinction. The preparation method comprises the following steps: crushing titanium concentrate, mixing the crushed titanium concentrate with hydrochloric acid, carrying out acidolysis, filtering out residues, adding iron powder into the residual titanium oxychloride solution to reduce, crystallizing the solution by freezing, extracting to remove impurities, and hydrolyzing to obtain amorphous titanium dioxide; calcining and crushing to obtain titanium dioxide powder; ferric chloride crystals generated in the crystallization process, ferrous chloride generated in the extraction process and a ferric chloride solution are subjected to pyrohydrolysis, distillation and redissolution to obtain regenerated hydrochloric acid, and the regenerated hydrochloric acid is supplemented into the acidolysis process; compared with titanium dioxide prepared through a traditional process, titanium dioxide prepared through the preparation method has more excellent optical performance, covering power, decoloration power and weather resistance, hydrochloric acid can be recycled in the preparation process, three-waste emission of a factory is effectively reduced, and environmental protection is facilitated.

Description

technical field [0001] The invention belongs to the technical field of textile raw materials, in particular to a preparation method of titanium dioxide for polyester chemical fiber matting. Background technique [0002] Since its inception, polyester fiber has gradually become the fastest-growing and highest-yielding variety of synthetic fibers due to its excellent physical and chemical properties, and has been continuously demanding higher strength, modulus and dimensional stability from the traditional clothing and home furnishing fields. The application in the industrial field continues to expand, and its application in the field of composite materials has also received more and more attention. [0003] For polyester chemical fibers, white pigments are added before spinning to improve their optical properties. This process is called spinning matting, and the added white pigments are called "matting agents". Anatase titanium dioxide has good refractive index and sufficien...

AI Technical Summary

Problems solved by technology

The process is characterized by short production process, continuous operation, large-scale single-series equipment, and less "three wastes" emissions; however, the production process of titanium dioxide by the chloride method involves many disciplines such as chemical industry, metallurgy, materials, machinery, control, fluids, etc. Professional, its technology is difficult, and the key equipment is complex

[0005] For a long time, the production technology of sulfuric acid titanium dioxide in my country is backward, the product quality is unstable and the grade is low

The calcined titanium dioxide product has a coarse particle size and insufficient calcination strength, resulting in low TiO2 content and low rutile conversion rate. It shows poor weather resistance, poor dispersibility, low achromatic power, low hiding power and high oil absorption in the application of textile raw materials.

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