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Method for preparing pigment-level titanium powder and coarse titanium white from blast slag containing titanium

A blast furnace slag, pigment grade technology, applied in the direction of titanium dioxide, fibrous filler, titanium oxide/hydroxide, etc., can solve the problem of difficulty in titanium leaching, and achieve the effect of low acid consumption, low temperature and energy saving

Inactive Publication Date: 2006-03-08
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

3. The leaching slag produced in the first leaching process is acid-decomposed by grinding and leaching. This mechanical activation method significantly enhances the reactivity of the material, improves the decomposition rate of titanium, and solves the remaining 15% of the slag. Difficult leaching of titanium, decomposition can be carried out at lower sulfuric acid concentration, acid excess coefficient and reaction temperature, reducing sulfuric acid consumption

Method used

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  • Method for preparing pigment-level titanium powder and coarse titanium white from blast slag containing titanium
  • Method for preparing pigment-level titanium powder and coarse titanium white from blast slag containing titanium
  • Method for preparing pigment-level titanium powder and coarse titanium white from blast slag containing titanium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The process flow of this embodiment is as image 3 As shown, the process steps are as follows:

[0035] 1. Water quenching

[0036] The molten titanium-containing blast furnace slag is sprayed with water at 10°C and quickly cooled to 30°C. The XRD pattern of the obtained water-quenched titanium-containing blast furnace slag is as follows figure 2 Shown

[0037] 2. Grinding

[0038] Grind the titanium-containing blast furnace slag after water quenching to 0.076~0.10mm, and the content of each component is TiO 2 22.49%, Al 2 O 3 13.69%, MgO 7.08%, SiO 2 22.55%, CaO 26.84%, TFe 1.16%;

[0039] 3. One-stage leaching

[0040] Take 900 grams of the above-mentioned ground titanium-containing blast furnace slag for one stage leaching with 5% mass concentration sulfuric acid, the amount of sulfuric acid is 1.0 times the theoretical amount, and react at normal pressure and 90°C for 60 minutes. The original slag contains 50.1% TiO 2 , 100% Al 2 O 3 And 69.1% MgO entered the leaching s...

Embodiment 2

[0048] The process flow of this embodiment is as image 3 As shown, the process steps are as follows:

[0049] 1. Water quenching

[0050] Spray the molten titanium-containing blast furnace slag with water at 30°C and quickly cool it to 60°C;

[0051] 2. Grinding

[0052] Grind the titanium-containing blast furnace slag after water quenching to 0.10~0.15mm, and the content of each component is TiO 2 22.49%, Al 2 O 3 13.69%, MgO 7.08%, SiO 2 22.55%, CaO 26.84%, TFe 1.16%;

[0053] 3. One stage leaching

[0054] Take 300 grams of the above-mentioned ground titanium-containing blast furnace slag and use the waste sulfuric acid produced by the hydrolysis process of pigment-grade titanium dioxide in Example 1 to perform one-stage leaching. The amount of sulfuric acid is 0.8 times the theoretical amount. Reaction at 70℃ for 90min, 46.6% TiO in the original slag 2 , 98.9% Al 2 O 3 And 63.7% MgO into the first leaching solution;

[0055] 4. Two-stage grinding and immersion

[0056] The lea...

Embodiment 3

[0062] The process flow of this embodiment is as image 3 As shown, the process steps are as follows:

[0063] 1. Water quenching

[0064] Spray the molten titanium-containing blast furnace slag with water at 20°C and quickly cool it to 40°C;

[0065] 2. Grinding

[0066] Grind the titanium-containing blast furnace slag after water quenching to 0.076~0.10mm, and the content of each component is TiO 2 22.49%, Al 2 O 3 13.69%, MgO 7.08%, SiO 2 22.55%, CaO 26.84%, TFe 1.16%;

[0067] 3. One stage leaching

[0068] Take 300 grams of the above-mentioned ground titanium-containing blast furnace slag and use the waste sulfuric acid produced by the hydrolysis process of pigment-grade titanium dioxide in Example 2 to perform a one-stage leaching. The amount of sulfuric acid is 0.8 times the theoretical amount. Reaction at 70℃ for 90min, 46.6% TiO in the original slag 2 , 98.9% Al 2 O 3 And 63.7% MgO into the first leaching solution;

[0069] 4. Two-stage grinding and immersion

[0070] The ...

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Abstract

A method for preparing pigment-class titanium white powder and coarse titanium white utilizing titanium-contained blast furnace slag comprises the following process steps: water quenching, water cooling molten state titanium-contained blast furnace slag; grinding, grinding the slag into fine particles; single leaching, leaching the slag using sulfuric acid, pressure, normal pressure,temperature,60-90deg.C,mass concentration of sulfuric acid,5-35%,sulfuric acid dosage,0.6-1.0 theoretic value; two stage grinding-leaching, acid decomposing leached slag obtained by single leaching using grinding-leaching manner, pressure, normal pressure,temperature,50-100deg.C,mass concentration of sulfuric acid,30-65%,sulfuric acid dosage,1.0-1.5 theoretic value; preparing pigment-class titanium white powder, hydrolyzing leach solution from two stage grinding-leaching, filtering, washing, calcinating and surface treating to obtain pigment-class titanium white powder; preparing coarse titanium white, hydrolyzing leach solution from single leaching, filtering, washing, calcinating to obtain coarse titanium white.

Description

Technical field [0001] The invention belongs to the processing field of titanium-containing blast furnace slag produced by ironmaking, and particularly relates to a method for preparing pigment-grade titanium dioxide and crude titanium dioxide by using titanium-containing blast furnace slag. Background technique [0002] Ironmaking will inevitably produce a large amount of blast furnace slag, especially the titanium-bearing blast furnace slag in Panzhihua, my country, has accumulated more than 50 million tons, which not only wastes precious titanium resources, but also pollutes the environment. The slag contains TiO 2 20-26%, CaO20-27%, SiO 2 17-25%, Al 2 O 3 10-16%, MgO 5-10%, titanium mainly exists in two phases, titanium diopside and perovskite. The slag is used as a cement raw material, because of the high titanium content, the cement strength is reduced; pyrometallurgy or beneficiation methods are used to separate titanium from titanium-containin...

Claims

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Application Information

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IPC IPC(8): C09C1/36C01G23/047
Inventor 李春梁斌严芳吴潘
Owner SICHUAN UNIV
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