A kind of preparation technology of iron oxide black co-producing ammonium sulfate

Abstract

The invention provides a process for preparing iron oxide black by co-producing ammonium sulfate, which belongs to the field of pigment preparation. The method comprises the following steps: (1) dissolving ferrous sulfate in water to obtain a ferrous sulfate solution; (2) adding ammonia water to the ferrous sulfate solution in the step (1), at a temperature of 20-50°C reaction; (3) heating the reacted solution in the step (2) to 80-90°C; (4) adding amorphous ferric oxyhydroxide to the heated solution in the step (3) for reaction, and the reaction During the process, the pH value of the solution is controlled to be 9-11; (5) After the reaction is completed, filter, recover ammonium sulfate from the filtrate, and dry the filter cake to obtain the prepared iron oxide black pigment. The iron oxide black prepared by the method of the invention has the advantages of single crystal structure, small particle size, high purity and strong coloring ability.

Description

technical field [0001] The invention relates to a preparation process of iron oxide black for co-production of ammonium sulfate, which belongs to the field of pigment preparation. Background technique [0002] Iron oxide black is referred to as iron black for short, its molecular formula is Fe3O4, or Fe2O3·FeO, and its chemical name is ferric oxide. Iron oxide black has saturated blue ink black, high hiding power and tinting power, and is widely used in coloring fields such as building materials, cement, ink, printing, and plastics. In recent years, the demand for iron oxide black in my country has continued to increase, with an annual growth rate of 107%, far higher than the 36.6% growth rate of the entire iron oxide pigment, and is second only to iron red and iron yellow iron pigments. [0003] Many methods for preparing iron oxide black have been disclosed in the prior art. For example, Chinese patent document CN1709985A discloses a method for preparing iron oxide black...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that there are problems of long oxidation time and many by-products in the preparation of iron oxide black in the prior art, resulting in poor tinting strength of iron oxide black, and then providing a method of replacing oxygen-containing iron oxide with amorphous iron oxyhydroxide The method for preparing iron oxide black using body as addition raw material

Images