Method for producing iron oxide red by using ferrous sulfate as titanium dioxide byproduct

A technology of ferrous sulfate and red iron oxide, applied in the directions of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of increased solution viscosity, difficult filtration, serious hydrolysis of ferrous ions, etc., and achieves high recovery rate and purity. , the effect of reducing production costs and simplifying the process

Inactive Publication Date: 2012-08-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method is relatively simple in technology, it has the following problems: 1. When the pH of the solution is adjusted to 5-6, the hydrolysis of ferrous ions is serious, the viscosity of the solution increases, and it is difficult to filter; 2. Impurity magnesium in ferrous sulfate cannot be removed. clean, especially for raw materials with a high initial content of magnesium; 3. The patent only states that the purity of the finished iron oxide

Method used

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  • Method for producing iron oxide red by using ferrous sulfate as titanium dioxide byproduct
  • Method for producing iron oxide red by using ferrous sulfate as titanium dioxide byproduct
  • Method for producing iron oxide red by using ferrous sulfate as titanium dioxide byproduct

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Embodiment 1

[0027] In this embodiment, the process flow of producing iron oxide red with titanium dioxide by-product ferrous sulfate is shown in figure 1 ,Proceed as follows:

[0028] (1) Purification and removal of impurities by titanium dioxide by-product ferrous sulfate

[0029] In the reaction vessel that is equipped with stirring paddle, load raw material: titanium dioxide by-product ferrous sulfate and tap water, the mass ratio of described ferrous sulfate and tap water is 2: 1, the raw material in the reaction vessel is heated to 70 ℃ and in Stir at this temperature until the ferrous sulfate dissolves, add ammonia water to adjust the pH of the aqueous solution to 3.97, and then add NH 4 F, react at normal pressure and 70°C for 30 minutes under stirring, after the reaction time expires, centrifuge to separate the precipitate to obtain a purified solution, the NH 4 The addition of F is 6% of the mass of ferrous sulfate by-product of raw material titanium dioxide;

[0030] (2) Conc...

Embodiment 2

[0038] In this embodiment, the process flow of producing iron oxide red with titanium dioxide by-product ferrous sulfate is shown in figure 1 ,Proceed as follows:

[0039] (1) Purification and removal of impurities by titanium dioxide by-product ferrous sulfate

[0040] In the reaction vessel that is equipped with stirring paddle, load raw material: titanium dioxide by-product ferrous sulfate and tap water, the mass ratio of described ferrous sulfate and tap water is 1: 1, the raw material in the reaction vessel is heated to 50 ℃ and in Stir at this temperature until ferrous sulfate dissolves, add ammonia water to adjust the pH of the aqueous solution to 2.23, then add NaF to the aqueous solution, and react at normal pressure and 50°C for 60 minutes under stirring. After the reaction time expires, centrifuge to separate Precipitate, obtain purification liquid, the add-on of described NaF is 0.3% of the mass of ferrous sulfate of raw material titanium dioxide by-product;

[0...

Embodiment 3

[0047] In this embodiment, the process flow of producing iron oxide red with titanium dioxide by-product ferrous sulfate is shown in figure 1 ,Proceed as follows:

[0048] (1) Purification and removal of impurities by titanium dioxide by-product ferrous sulfate

[0049] In the reaction vessel that is equipped with stirring paddle, load raw material: titanium dioxide by-product ferrous sulfate and tap water, the mass ratio of described ferrous sulfate and tap water is 1.5: 1, the raw material in the reaction vessel is heated to 60 ℃ and in Stir at this temperature until ferrous sulfate dissolves, add ammonia water to adjust the pH of the aqueous solution to 2.95, then add KF to the aqueous solution, and react at normal pressure and 60°C for 40 minutes under stirring. After the reaction time expires, centrifuge to separate Precipitate, obtain purification liquid, the add-on of described KF is 1.6% of the mass of ferrous sulfate of raw material titanium dioxide by-product;

[0...

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Abstract

The invention discloses a method for producing oxide red by using ferrous sulfate as a titanium dioxide byproduct. The method comprises the following process steps of: firstly, dissolving the ferrous sulfate as the titanium dioxide byproduct with water of which the temperature is 50-80DEG C at normal pressure to form an aqueous solution; then adding ammonia water into the aqueous solution; adjusting the pH value of the aqueous solution to 2.2-4.0; adding soluble fluoride into the aqueous solution; reacting at the temperature of 50-80DEG C and normal pressure for 20-60 minutes by stirring; and after the reaction time reaches, separating a precipitation to obtain a purified liquid, wherein the addition mount of the soluble fluoride is 0.3-10 percent of the mass of the ferrous sulfate as the titanium dioxide byproduct; secondly, condensing and crystallizing the purified liquid obtained in the first step to obtain a pure ferrous sulfate crystal; and thirdly, dehydrating the pure ferrous sulfate crystal obtained in the second step at the temperature of 200-350DEG C and normal pressure for 20-60 minutes and calcining the reacted product at the temperature of 800-900DEG C and normal pressure for 1-4h to obtain the iron oxide red.

Description

technical field [0001] The invention belongs to a production method of iron oxide red, in particular to a method for producing high-purity iron oxide red by using ferrous sulfate, a by-product of titanium dioxide. Background technique [0002] High-purity iron oxide red can not only be used as a pigment, but also can be used to prepare magnetic materials. Iron oxide pigments are very important inorganic color pigments, their products have minimal toxicity and are widely used. Among a series of iron oxide pigments, iron oxide red is the most widely used, it is the most stable compound among iron oxides, its chemical name is ferric oxide (Fe 2 o 3 ). The typical production methods of iron oxide red are: green vitriol calcination method, iron mud roasting method, pyrite slag method, etc. [0003] In the production process of titanium dioxide, a large amount of ferrous sulfate (namely green vitriol) will be produced. For every ton of titanium dioxide produced, about four ton...

Claims

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Application Information

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IPC IPC(8): C01G49/06
Inventor 李军张雅晴罗建洪金央马春磊
Owner SICHUAN UNIV
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