Method for co-producing alpha type iron oxide, iron oxide red and ammonium sulfate with by-product of titanium dioxide

Abstract

The invention discloses a method for co-producing α-type iron oxide, iron oxide red and ammonium sulfate by-products of titanium dioxide, which comprises the steps of synthesizing α-type iron oxide, α-type iron oxide, α- Type iron oxide induces the synthesis of iron oxide red and the synthesis of ammonium sulfate, by selecting and optimizing the synthesis temperature, concentration (FeSO4 concentration≧500g / L), time, solution pH (when synthesizing α-type iron oxide, pH≧11.0; synthesis oxidation Iron red, pH≧9.5) and other process conditions, using iron oxide crystal seeds to induce the by-product ferrous sulfate of titanium dioxide to attach and grow on the crystal seeds, can synthesize high-quality α-type iron oxide, and then further use the synthesized α-type iron oxide Obtain iron oxide red from iron and recover ammonium sulfate. The method has the characteristics of good product crystal form, uniform and fine particles, simple preparation process operation, high product yield and low cost.

Description

technical field [0001] The invention relates to the technical field of iron oxide preparation, in particular to a method for coproducing α-type iron oxide, iron oxide red and ammonium sulfate by-products of titanium dioxide. Background technique [0002] Iron oxide pigment is a kind of inorganic color pigment with a large quantity and a wide range. Its production and sales volume is second only to titanium dioxide, and it is also the largest color pigment in the world. Iron oxide pigments have been widely used in construction materials, coatings, inks, plastics, ceramics, papermaking and magnetic recording materials and other industries. Among them, the construction industry is the largest application field of iron oxide pigments, and the usage accounts for about 60% of iron oxide pigments. At present, the annual production and sales of iron oxide pigments in the world are about 1.5 million tons, and the annual output in China alone has reached 700,000 tons. However, due t...

AI Technical Summary

Problems solved by technology

[0005] Based on the technical problems existing in the background technology, the present invention proposes a method for co-producing α-type iron oxide, iron oxide red and ammonium sulfate by titanium dioxide by-products, selects and optimizes synthesis temperature, concentration (FeSO 4 Concentration≧500g / L), time, solution pH (when preparing α-type iron oxide, pH≧11.0; when preparing iron oxide red, pH≧9.5) and other technological conditions, use iron oxide crystal seeds to induce titanium dioxide by-product ferrous sulfate Attaching and growing on crystal seeds can synthesize high-quality α-type iron oxide, and then further use the synthesized α-type iron oxide to obtain iron oxide red and recover ammonium sulfate. This method has the advantages of good crystal form of the product, uniform and fine particles, and easy preparation process. The characteristics of simplicity, high product yield and low cost solve the problems of low product quality, poor uniformity, unstable color and poor controllability of the synthesis process