A co-production process of titanium dioxide, iron red, and polymerized ferrous sulfate chloride

Abstract

The invention discloses a coproduction technology of titanium white, iron oxide red and polymerized chlorinated ferrous sulfate. The coproduction technology comprises the following steps: crushing andgrinding ilmenite and conveying to be subjected to sulfuric acid process titanium white production and ilmenite pre-reduction treatment respectively; obtaining titanium white powder, FeSO4.7H2O and waste acid in the sulfuric acid process titanium white production; adding the ilmenite subjected to the pre-reduction treatment into waste acid and reacting to obtain synthetic rutile and a saturated FeSO4 solution; adding an NaOH solution into the saturated FeSO4 solution and introducing air under a stirring condition to obtain iron oxide black; calcining iron oxide black in a rotary kiln to obtain iron oxide red; carrying out chlorination process titanium white production on the synthetic rutile to obtain the titanium white powder, hydrochloric acid and CaCl2; putting the saturated FeSO4 solution into a sealed container and introducing chlorine gas and reacting to obtain polymerized chlorinated ferrous sulfate; carrying out mixed firing on the FeSO4.7H2O and coal to prepare sulfuric acidand iron oxide. According to the coproduction technology disclosed by the invention, byproducts produced in each section of the technology are effectively utilized, the production cost is greatly reduced and green circulation economy advocated in China is met.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a co-production process of titanium dioxide, iron red and polymerized ferrous sulfate chloride. Background technique [0002] The "Thirteenth Five-Year Plan" of China's titanium dioxide industry: Encourage the development of both the chlorination process and the sulfuric acid process for advanced clean production. For sulfuric acid titanium dioxide, a large number of by-products of ferrous sulfate and about 20% of sulfuric acid have become important factors restricting its development and operation. The high cost of by-product treatment and easy to cause secondary pollution have become a major problem in the industry; while chlorination Due to its unique product performance and low pollution, titanium dioxide has become the mainstream production technology of titanium dioxide. How to ensure sufficient supply of high-quality and cheap titanium-rich materials is the key t...

AI Technical Summary

Problems solved by technology

For sulfuric acid titanium dioxide, a large number of by-products of ferrous sulfate and about 20% of sulfuric acid have become important factors restricting its development and operation. The high cost of by-product treatment and easy to cause secondary pollution have become a major problem in the industry; while chlorination Due to its unique product performance and low pollution, titanium dioxide has become the mainstream production technology of titanium dioxide. How to ensure sufficient supply of high-quality and cheap titanium-rich materials is the key to the future titanium dioxide industry by chloride method. Traditional There are many deficiencies in the production technology of titanium-rich materials. For example, the electric furnace smelting method has poor ability to remove non-ferrous impurities, and can only use low-calcium magnesium raw materials. In addition, it can only be used in areas with sufficient electricity; the hydrochloric acid leaching method has a large amount of three wastes and high treatment costs. shortcoming

[0003] Today's industry generally has the problem of a single industrial chain. The high cost of three wastes treatment has become an important problem restricting the development of enterprises. The problems of difficult disposal and high cost of the three wastes will become increasingly prominent

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