Process for preparing iron oxide red by using sulfuric acid crystal seed mixed acid method and products thereby

Abstract

The invention relates to a process for preparing iron oxide red by using sulfuric acid crystal seed mixed acid method, which comprises preparing iron oxide red seed crystal with sulfuric acid process, then washing the iron oxide red seed crystal, lowering the content of sulphate and other impurities in the sulfuric acid process iron oxide red seed crystal, preparing iron oxide red slurry through two-step oxidization, finally dewatering, water scrubbing and drying to obtain the end product.

Description

technical field

[0001] The invention relates to the field of preparation of inorganic chemical pigments, in particular to a method for preparing iron oxide red by a sulfuric acid seed mixed acid method and a product thereof. Background technique

[0002] Iron oxide red is an ancient pigment. Humans began to use iron-based pigments in paintings about 20,000 years ago. Humans began to use natural iron oxide minerals, which were crushed and used as pigments. Later, due to the needs of industrial development, in order to prepare products with more purity and superior performance, artificially synthesized iron oxide pigments began to be developed around the 1950s, and now they have gradually replaced natural products. In recent years, synthetic products have accounted for more than 80% of the total output of pigments.

[0003] The production process of iron oxide red pigment can generally be divided into two major processes: dry process and wet proces...