Method for preparing iron oxide red by byproduct ferrous sulfate of titanium dioxide

Abstract

The invention discloses a method for preparing iron oxide red by taking byproduct ferrous sulfate of titanium dioxide as a raw material. The method comprises the following steps: purifying the byproduct ferrous sulfate, removing impurities, pouring the purified ferrous sulfate solution into a container, stirring the solution and adding ammonia water, adjusting the pH value of the solution to be between 6.5 and 9, and stopping the addition of ammonia water; washing and filtering the obtained material, and stopping until the pH value of the solution is between 6.5 and 7 to obtain filter cake and filtrate; and calcining the obtained filter cake in a rotary kiln to obtain an iron oxide red semi-finished product, putting the semi-finished product into a ball mill, adding water for ball milling, washing, filtering and drying the obtain material after ball milling, and crushing after drying to obtain an iron oxide red product. The method solves the problem of treating the byproduct for titanium dioxide manufacturers, is favorable for environmental protection, and reduces the production cost of iron oxide red; and the iron oxide red prepared by the method is mainly used in aspects of coloring agents, antirust paint pigment, ceramic pigment of building materials, polishing agents of precision parts, and the like.

Description

1. Technical field: [0001] The invention relates to a method for preparing iron oxide red, in particular to a method for preparing iron oxide red by using ferrous sulfate, a by-product of titanium dioxide. 2. Background technology: [0002] Iron oxide red is a common inorganic pigment widely used in coatings, building materials, plastics, electronics and other fields; high-purity iron oxide red can be used as a polishing agent for optical glass and advanced abrasive materials. There are two common production methods for iron oxide red: [0003] The first is the green vitriol calcination method: this method uses pure green vitriol as a raw material for high-temperature calcination, and the produced iron oxide red is washed with water, dried, and crushed to become a product. [0004] The second is the wet air oxidation method: the main raw material of this method is iron sheet, and the production process starts from the preparation of seed crystals, using sulfuric acid or nit...

AI Technical Summary

Problems solved by technology

[0005] The main raw materials of the above-mentioned wet production method of iron oxide red are iron sheet and sulfuric acid, and the raw material route limits the production of iron oxide red to a certain extent; meanwhile, a large amount of by-product ferrous sulfate is produced in the sulfuric acid method titanium dioxide production process , there are about 4 tons of ferrous sulfate as a by-product for every ton of titanium dioxide produced, and if the by-product ferrous sulfate cannot