Method for producing high-purity iron oxide red by using titanium dioxide byproduct ferrous sulfate

A technology for the by-production of titanium dioxide and ferrous sulfate, applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problem of low utilization rate of ferrous sulfate and achieve the effect of small emissions

Pending Publication Date: 2021-11-02
邱斌
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the defect of low utilization rate of titanium dioxide by-product ferrous sulfate in the prior art, and provide a method for producing high-purity iron oxide red by using titanium dioxide by-product ferrous sulfate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for producing high-purity iron oxide red with titanium dioxide by-product ferrous sulfate, comprising the following steps:

[0025] S1, purification and refining of ferrous sulfate heptahydrate

[0026] ① First add 1800 liters of deionized pure water, start stirring (stirring speed is 45-55 rpm) and steam to heat up. Then gradually add 1200 kg of ferrous sulfate heptahydrate to dissolve in the dissolving pot, and heat up to 60-65°C to stop the steam. When the ferrous sulfate is completely dissolved, at this time, the concentration of the ferrous sulfate solution is detected at 42Be°, that is, 1.43ɡ / cm 3 Control, (concentration can be adjusted by adding pure water or ferrous sulfate). Then, gradually and slowly add 60 kg of ammonium bicarbonate to the ferrous sulfate solution, the temperature should not exceed 65°C when the ammonium bicarbonate is added, and stop stirring when the pH value of the ferrous sulfate solution is controlled between 4.8-5.2. Continu...

Embodiment 3

[0046] A method for producing high-purity iron oxide red with titanium dioxide by-product ferrous sulfate, comprising the following steps:

[0047] The difference between this embodiment and Comparative Document 1 is

[0048] S3, neutralize sedimentation

[0049] During the whole neutralization and precipitation reaction process, the flow rate of adding ferrous sulfate solution should be strictly controlled (this link will determine the particle thickness of iron oxide red), and the time is 20 minutes (controlled by flow meter).

[0050] Weighing obtains 279 kilograms of ferric oxide.

[0051] The detected values ​​are: ferric oxide content 99.5%, silicon dioxide 35PPM, BET2.15 Example 4

[0052] A method for producing high-purity iron oxide red with titanium dioxide by-product ferrous sulfate, the difference between this embodiment and embodiment 1 is

[0053] S1, during the purification of ferrous sulfate heptahydrate, first add 1800 liters of deionized pure water, start ...

Embodiment 5

[0060] A method for producing high-purity iron oxide red with titanium dioxide by-product ferrous sulfate, the difference between this embodiment and embodiment 1 is

[0061] S3, neutralize sedimentation

[0062] Start the stirring in the neutralization reaction barrel, control the stirring speed to 45-55 rpm, first pump the ammonium bicarbonate solution into the neutralization barrel, then add the ferrous sulfate solution to the ferrous sulfate solution, and neutralize the precipitation Strictly control the flow rate of adding ferrous sulfate solution during the reaction (this link will determine the particle thickness of iron oxide red), and the time is 20 minutes (controlled by a flow meter). The whole neutralization process needs to turn on the steam to control the temperature at 40-45°C, and then pump it into the suction filter tank (the filter layer is composed of one layer of wool, two layers of fast filter paper and one layer of polyester cloth) for vacuum filtration. ...

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Abstract

The invention discloses a method for producing high-purity iron oxide red by using a titanium dioxide byproduct ferrous sulfate. The method comprises the steps of S1, purifying and refining ferrous sulfate heptahydrate; S2, preparing an ammonium bicarbonate solution; S3, neutralizing and settling; S4, calcining; and S5, sieving, blending and packaging. The method is a chemical sedimentation method, and a titanium dioxide byproduct ferrous sulfate is consumed by adopting a relatively low-cost, simple and safe method, so that relatively tense magnetic high-purity iron oxide red on the market is obtained. The purity of the iron oxide red obtained according to the method can reach 99.5% or above. According to the method, more than 4 tons of ferrous sulfate heptahydrate is consumed when one ton of iron oxide red is produced, and the produced three wastes are reasonably and scientifically treated to achieve very small emission.

Description

technical field [0001] The invention relates to a process for preparing high-purity iron oxide red by using ferrous sulfate heptahydrate, a by-product of titanium dioxide, and belongs to the basic and important chemical raw materials in the ferrite magnetic material industry. Background technique [0002] The by-product ferrous sulfate heptahydrate produced by sulfuric acid production of titanium dioxide has low iron added value, and long-term stacking will also cause surface oxidation, and the precipitated wastewater will also pollute the environment. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the defect of low utilization rate of ferrous sulfate as a by-product of titanium dioxide in the prior art, and provide a method for producing high-purity iron oxide red by using ferrous sulfate as a by-product of titanium dioxide. [0004] A method for producing high-purity iron oxide red with titanium dioxide by-pr...

Claims

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Application Information

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IPC IPC(8): C01G49/06
Inventor邱斌
Owner邱斌