Process for preparing ferric oxide red by adopting iron vitriol

Abstract

The invention provides a process for preparing ferric oxide red and recovering high-concentration sulfur dioxide burner gas for producing sulfuric acid or sulfite by taking iron vitriol and sulfur as raw materials, and adopting processes such as preparing ferrous sulfate monohydrate through concentration of iron vitriol, conducting superfine treatment on ferrous sulfate monohydrate, calcining, dust separating, and secondary dust calcining. The process provides a new technical way for preparing ferric oxide red paint by taking iron vitriol which is solid waste as a raw material, so as to effectively solve the problem that the iron vitriol which is a by-product of titanium white preparation adopting a sulfuric acid method is difficult to digest, has an important meaning in the development of the ferric oxide red industry, is suitable for large industrialized continuous production, and has the advantages that the preparation cost is low, the performance of the ferric oxide red product is high, and the dispersivity and the tinting strength of the product are higher than those of a ferric oxide red product prepared according to a classic method (namely the wet method).

Description

technical field [0001] The invention discloses a process for preparing superfine iron oxide by using ferrous sulfate heptahydrate, which belongs to the technical field of general pigment chemical preparation process. technical background [0002] China is a big producer of iron oxide red series pigments. In 2011, the domestic output of iron oxide red series pigments exceeded 800,000 tons. At present, iron oxide red in China is generally prepared from iron sheet or iron filings, and is prepared by wet oxidation process. Iron red with better pigment performance is generally prepared by using ferrous sulfate heptahydrate as raw material. The preparation of iron oxide red series pigments by using ferrous sulfate heptahydrate requires dissolving and refining ferrous sulfate heptahydrate and then neutralizing it with ammonia water. A large amount of calcium sulfate solid waste is produced in the process, and a large amount of steam is consumed at the same time, and the preparatio...

AI Technical Summary

Problems solved by technology

The long-term stacking of ferrous sulfate heptahydrate will affect the surrounding environment. It can only consume a small amount of ferrous sulfate heptahydrate for the production of polyferric sulfate or wet preparation of ultra-fine iron oxide red, and a large amount of ferrous sulfate heptahydrate Difficult to digest

The products produced by this process still have the problems of poor pigment performance and high soluble salt content, and have not yet been mass-produced