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Method for preparing high purity iron oxide yellow and iron oxide red using titanium dioxide byproduct ferrous sulfate

A technology for iron oxide red and iron oxide yellow, applied in the field of preparation of iron oxide yellow and iron oxide red, can solve the problems of complex production process, low product purity and high production cost, and achieves short process flow, high impurity removal degree, The effect of low production cost

Inactive Publication Date: 2007-12-26
奚长生
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Problems solved by technology

[0012] In order to overcome the shortcomings of heating, impurity removal, complex production process, high production cost and low product purity in the existing methods of producing iron oxide yellow and iron oxide red by using ferrous sulfate as a by-product of titanium dioxide production , the present invention provides a method for refining, oxidizing, and producing high-purity iron oxide yellow and iron oxide red by using ferrous sulfate solution, a by-product of titanium dioxide, at a temperature lower than 60°C

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  • Method for preparing high purity iron oxide yellow and iron oxide red using titanium dioxide byproduct ferrous sulfate

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Embodiment 1

[0029] The method for preparing high-purity iron oxide yellow and iron oxide red by ferrous sulfate by-product of titanium dioxide, the concentration of ferrous sulfate is 20%, and the sulfuric acid method is used to produce titanium dioxide. Also contains Mg, Al, Si, Ca, Ti, Zn, Ba, Mn and other elements. These elements have a great influence on the production of iron oxide yellow and iron oxide red, so the first step is to refine the above-mentioned ferrous sulfate solution 1:

[0030] There are two steps of impurity removal and separation in the process of refining 1. In the present embodiment, the two steps of impurity removal are carried out at room temperature. The first step of impurity removal and separation is to remove titanium 11 and other impurities, dilute with water or adjust with dilute alkaline solution. The pH value of the above solution is greater than 1.5, so that the titanium ion Ti 3+ Complete hydrolysis to form metatitanate H 2 TiO 3 , the hydrolysis p...

Embodiment 2

[0042] In this embodiment, the concentration of ferrous sulfate is 1 mol·L -1 , after dissolving, use concentrated NaOH solution to directly adjust the pH value to 5.5, hydrolyze the titanium and ferric iron in the solution, filter, carry out impurity removal and purification 1, and adjust the pH value of the filtrate after impurity removal and purification 1 with 20% NaOH solution For 3-7, a ferrous sulfate colloid with a dark green solution is obtained. Under the condition that the temperature is lower than 60 °C, the colloid is then oxidized with air for 2 to obtain iron oxide yellow; the iron oxide yellow is calcined at a temperature of 300 °C After 4, it is converted into red iron oxide with a purity of more than 96%, which meets the national standard for producing red iron oxide by sulfuric acid method.

[0043] In the invention, under the condition that the temperature is lower than 60 DEG C, the titanium dioxide by-product ferrous sulfate solution is purified and impur...

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Abstract

The invention relates to a method to prepare high-pure iron oxide yellow and iron oxide red by ferrous sulfate as byproduct in titanium white, which comprises: when temperature under 60Deg, refining the material to remove impurity; with oxidant, adjusting pH value of solvent to hydrolyze and remove Ti and co-precipitate to remove metal ion; regulating pH value and feeding air for oxidation at normal temperature; obtaining the products with different reaction conditions. This method is simple, needs low cost and obtains product with high purity.

Description

【Technical field】 [0001] The invention relates to a method for preparing yellow iron oxide and red iron oxide, in particular to a method for preparing yellow iron oxide and red iron oxide by utilizing titanium dioxide by-product ferrous sulfate. 【Background technique】 [0002] Iron oxide yellow and iron oxide red are common inorganic pigments, widely used in coatings, building materials, plastics, electronics and other fields; high-purity red iron oxide can be used as a polishing agent for optical glass and advanced abrasive materials. The common production methods of iron oxide yellow and iron oxide red are mainly as follows: [0003] The first preparation method is the green vitriol calcination method: this method uses pure vitriol as the raw material for high temperature calcination, and the generated red iron oxide is washed with water, dried and pulverized into a product. [0004] The second preparation method is the wet air oxidation method: the main raw material of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/24C01G49/02
Inventor 奚长生奚慧芳奚长寿奚长庆
Owner 奚长生
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