Method for recycling waste product and by-product in sulfuric acid method titanium dioxide production

Abstract

The invention relates to a method for recycling the waste product and by-product in sulfuric acid method titanium dioxide production which adopts a forced circulation system which contains a sulfuric acid circulating pump, a cooler and recycle acid pipelines to cool and mix sulfuric acid, and combines the processes of refrigeration, purification and preparation of concentrated sulfuric acid in the sulfuric acid method titanium dioxide production to only one process through filtration, thus greatly simplifying the production process and reducing the production cost and investment. Because the invention adopts big flow forced circulation technology, the temperature of circulating sulfuric acid and the temperature difference are lower so that the demand to the material of the sulfuric acid circulating pump is reduced and the service life is prolonged; besides, the flow velocity on the sulfuric acid side of the cooler in the forced circulation technology is higher so that the scaling forming speed on the sulfuric acid side of the cooler is slower and the operation rate is higher. The invention solves the problems of the sulfuric acid method titanium dioxide production that the flows of refrigeration, purification and preparation of concentrated sulfuric acid are long, the investment is large, the operation rate is low, the production cost and the maintenance cost are high and the like, and the obtained economic benefit is remarkable.

Description

Technical field [0001] The invention relates to a method for recycling the waste by-products produced by the sulfuric acid method of titanium dioxide. Specifically, the invention provides a method for cooling, removing impurities and preparing concentrated sulfuric acid liquid associated with the production of titanium dioxide by the sulfuric acid method. Background technique [0002] At present, the continuous growth demand of titanium dioxide, a white pigment with excellent performance in the world, is mainly provided by two products: sulfuric acid method and chlorination method. The production technology of titanium dioxide by chlorination method is respected and monopolized by western developed countries with "clean technology", while The sulfuric acid method has the advantages of sufficient sources of raw materials and low production costs. Therefore, for a long period of time at present and in the future, the production of titanium dioxide by the sulfuric acid method wil...

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Problems solved by technology

[0006] It is not difficult to see that the existing cooling, impurity removal and preparation process of concentrated sulfuric acid is too long, the investment is large, the start-up rate is low, and the cost of production maintenance and organization management is also high. This is in the face of intensified global competition and environmental protection requirements Under the pressure of high titanium dioxide prices and lower and lower prices, companies often have to bear higher and higher operating costs, making products lose their own advantages in the competition

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