Wet method for preparing iron oxide red through introducing crystal form accelerant

Abstract

The invention relates to the field of iron oxide red preparation, and particularly relates to a wet method for preparing iron oxide red through introducing a crystal form accelerant. The wet method comprises steps of 1. adding the weighed industrial grade lime into clear water slowly, controlling the stirring speed to be 30-42r / min, standing the obtained lime slurry for 4-8 hours, and obtaining the crystal form accelerant after the lime is fully emulsified; 2. adding the obtained crystal form accelerant into a seed crystal reaction tank, then adding a titanium dioxide byproduct ferrous sulfate solution for purification and decontamination, adding a sodium hydroxide solution uniformly and slowly, controlling the reaction pH value to be 9-10, carrying out oxidation reaction with the air supplied by an air compressor, and obtaining an iron oxide red seed crystal; and 3. carrying out two-step oxidization on the obtained iron oxide red seed crystal, filtering, rinsing, filter pressing, stoving, smashing into powder so as to obtain the iron oxide red product. The wet method for preparing iron oxide red through an introducing crystal form accelerant is simple and easy to realize, has less pollution to environment, and has low potential safety hazard.

Description

technical field [0001] The invention relates to the field of preparation of iron oxide red, in particular to a method for wet preparation of iron oxide red by introducing a crystal accelerator. Background technique [0002] At present, the most effective way to deal with titanium dioxide by-product ferrous sulfate is to prepare iron oxide series pigments, and about 4 tons of titanium dioxide by-product ferrous sulfate can be consumed for every ton of iron oxide series pigments produced. [0003] Iron oxide red is a common inorganic pigment widely used in coatings, building materials, plastics, electronics and other fields. There are two main methods for preparing iron oxide red from titanium dioxide by-product ferrous sulfate: [0004] 1) Dry method (green vitriol calcination method): In this method, ferrous sulfate, a by-product of titanium dioxide after purification and removal of impurities, is used as raw material to obtain iron oxide red by high-temperature calcination....

AI Technical Summary

Problems solved by technology

The problems that these methods exist are: adopt industrial ammonia to prepare iron oxide red crystal seed, and production cost is high, and ammonia nitrogen is contained in the waste water, is difficult to handle thoroughly, easily forms secondary pollution, and industrial ammonia is a high-pressure, explosive and hazardous chemical item, which is difficult to transport and process. There are great safety hazards in the process of use; using sodium hydroxide to prepare iron oxide red crystal seeds, the production cost is high, the output of a single group of iron red is low, the product has high oil absorption, and the model is single, and sodium hydroxide is a corrosive hazardous chemical Items, there are greater safety hazards in the process of use

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