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, high production cost, low product purity and the like, and achieves short technological process, low production cost, High degree of impurity removal

Inactive Publication Date: 2006-05-03
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 titanium dioxide to produce b

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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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[0028] Example 1:

[0029] The method for preparing high-purity iron oxide yellow and iron oxide red from titanium dioxide by-product ferrous sulfate. The concentration of ferrous sulfate is 20%. Titanium dioxide is produced by sulfuric acid method. Ferrous sulfate is the main component in the by-product ferrous sulfate, followed by Also contains Mg, Al, Si, Ca, Ti, Zn, Ba, Mn and other elements. These elements have a great impact 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 refining 1 process. In this 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, and dilute it with water or adjust it with a dilute alkali solution. The pH value of above-mentioned solution is greater than 1.5, makes t...

Example Embodiment

[0041] Example 2:

[0042] The concentration of ferrous sulfate in the present embodiment is 1mol 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, and carry out impurity removal and refining 1, and the filtrate after impurity removal and refining 1 is adjusted to pH value with 20% NaOH solution 3-7, the solution is dark green ferrous sulfate colloid, under the condition of temperature lower than 60 ℃, then oxidize 2 to the colloid to obtain iron oxide yellow; iron oxide yellow is calcined at 300 ℃ After 4, it is transformed into iron oxide red with a purity of more than 96%, which meets the national standard for producing iron oxide red by sulfuric acid method.

[0043] The present invention refines and removes impurities from the by-product ferrous sulfate solution of titanium dioxide under the condition that the temperature is lower than 60°C. By adjusting the pH val...

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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 iron oxide yellow and iron oxide red, in particular to a method for preparing high-purity iron oxide yellow and iron oxide red by using ferrous sulfate, a by-product of titanium dioxide. 【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 iron oxide red can be used as a polishing agent for optical glass and advanced abrasive materials. There are three common production methods for iron oxide yellow and iron oxide red: [0003] The first preparation method is the green vitriol calcination method: in this method, pure green vitriol is used as a raw material for high-temperature calcination, and the produced red iron oxide is washed with water, dried, and crushed to become a product. [0004] The second preparation method is the wet air oxidation method: the main...

Claims

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Application Information

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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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