Method for producing iron oxide red by utilizing titanium dioxide byproduct ferrous sulfate heptahydrate

Abstract

The invention relates to a method for producing iron oxide red by utilizing titanium dioxide byproduct ferrous sulfate heptahydrate. The method comprises the production steps of (1) dissolving the byproduct ferrous sulfate heptahydrate obtained by the production of titanium dioxide into a water solution with the mass percent concentration being 8 percent, and filtering to obtain liquid for standbyuse; (2) feeding 8 percent of water solution into a mixed reactor, feeding ammonia gas, carrying out reaction of the 8 percent of water solution and the ammonia gas to generate mixed liquor of (NH4)2SO4 and Fe(OH)2; (3) heating the mixed liquor, pumping into a high gravity reactor, feeding air, carrying out reaction to obtain Fe(OH)3 and (NH4)2SO4, and carrying out solid-liquid separation; (4) washing the Fe(OH)3 obtained through separation, then calcining, and finally smashing and packaging to obtain a product; (5) adding lime into the (NH4)2SO4 obtained through separation to obtain gypsum and ammonia gas, and recycling the ammonia gas. The method is high in efficiency on producing the iron oxide red, the product quality is stable, and the production cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of iron oxide red production, in particular to a method for producing iron oxide red by using the by-product ferrous sulfate heptahydrate obtained from the production of titanium dioxide. Background technique [0002] Iron oxide red is an oxide of iron, non-toxic and tasteless, insoluble in water, stable chemical properties, is a kind of red pigment with good light and heat resistance, good performance, very stable to the atmosphere, acids and alkalis, strong hiding power, Good tinting strength, mainly used in ceramic industry, paint industry, plastic industry, and widely used in other industries. [0003] my country is a big producer of iron oxide red, with an overall production capacity of about 700,000 tons per year, and a basic balance between production and sales. At present, the vast majority of production capacity is produced with industrial iron filings, and most of the production enterprises are lo...

AI Technical Summary

Problems solved by technology

Ferrous sulfate heptahydrate is one of the by-products produced in a large amount in the production of sulfuric acid titanium dioxide. It has high water content and high impurity content. It is very difficult to directly sell it as a product, and it is basically not accepted. Accepted by the market, resulting in a large accumulation of ferrous sulfate heptahydrate in the sulfuric acid titanium dioxide industry, directly affecting the normal production of titanium dioxide equipment

[0007] 2. Chinese patent: resource utilization method of titanium dioxide by-product ferrous sulfate, application number: 201110177078.7, application date: 2011.06.28, applicant: Panzhihua MicroPort Technology Development Co., Ltd., address: 617000 Jinjiang, Panzhihua City, Sichuan Province Panzhihua Minimally Invasive Technology Development Co., Ltd., High Energy Consumption Vanadium and Titanium Industrial Park, Inventors: Tang Tie, Peng Lingbo, Abstract: The present invention discloses a resource utilization method of ferrous sulfate, a by-product of titanium dioxide, to solve the existing The technical problem that the titanium dioxide by-product ferrous sulfate cannot be fully utilized at low cost in the technology

[0012] The inventor has found that due to traditional techniques and technical reasons, there are almost no enterprises that use ferrous sulfate heptahydrate from titanium dioxide enterprises to produce red iron oxide so far, and currently use ferrous sulfate to produce iron oxide Red takes a long time and costs a lot

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