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Method for preparing ferric vanadate from crude titanium aluminum tetrachloride powder removal vanadium slag

A technology for removing vanadium slag and crude titanium tetrachloride from aluminum powder is applied in chemical instruments and methods, inorganic chemistry, iron compounds, etc., can solve problems such as serious environmental pollution, and achieves simple process flow, good environmental benefits, and good economy. effect of benefit

Inactive Publication Date: 2017-02-08
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the vanadium removal slag of crude titanium aluminum tetrachloride powder contains a large amount of chloride ions, which easily releases harmful gases such as hydrogen chloride during the storage process, causing serious environmental pollution.
[0007] At present, for the comprehensive utilization of crude titanium aluminum tetrachloride powder to remove vanadium slag, there is no literature information report on laboratory research, industrial test or industrial application at home and abroad.

Method used

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  • Method for preparing ferric vanadate from crude titanium aluminum tetrachloride powder removal vanadium slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Table 1 shows the composition and mass fraction of the vanadium-removing slag of the crude titanium-aluminum tetrachloride powder used.

[0037] Table 1

[0038] V Al Cl Fe Ti Ca Mg 1.9% 20.3% 31% 8.6% 1.8% 0.26% 0.28%

[0039] The vanadium-removing slag of crude titanium tetrachloride powder of the above composition is mixed with hydrochloric acid and titanium slag washing solution for oxidative leaching, wherein the mass ratio of HCl in hydrochloric acid to the crude titanium-aluminum tetrachloride powder-removing vanadium slag is 0.3:1, and the leaching The temperature is 20°C, the oxidant is hydrogen peroxide, the amount of oxidant added is 1 times of the theoretical amount, the leaching time is 180min, and the leaching rate of V after leaching is completed is 97%. Filter the leached slurry to obtain acidic leachate and filter cake. Sodium hydroxide was added to the acidic leaching solution to adjust the pH value to 1.5. Iron vanad...

Embodiment 2

[0041] Table 2 shows the composition and mass fraction of the vanadium-removing slag of the crude titanium-aluminum tetrachloride powder used.

[0042] Table 2

[0043] V Al Cl Fe Ti Ca Mg 1.9% 20.3% 31% 8.6% 1.8% 0.26% 0.28%

[0044]The vanadium-removing slag of crude titanium tetrachloride powder of the above composition is mixed with hydrochloric acid and titanium slag washing solution for oxidative leaching, wherein the mass ratio of HCl in hydrochloric acid to the crude titanium-aluminum tetrachloride powder-removing vanadium slag is 0.5:1, and the leaching The temperature is normal temperature, the oxidant is ozone, the amount of oxidant added is 5 times of the theoretical amount, the leaching time is 120min, and the leaching rate of V after leaching is completed is 98%. Filter the leached slurry to obtain acidic leachate and filter cake. Sodium carbonate is added to the acidic leaching solution to adjust the pH value to 1.8. Iron vanad...

Embodiment 3

[0046] The composition and mass fraction of the vanadium-removing slag used in the crude titanium aluminum tetrachloride powder are shown in Table 3.

[0047] table 3

[0048] V Al Cl Fe Ti Ca Mg 1.9% 20.3% 31% 8.6% 1.8% 0.26% 0.28%

[0049] Mix the vanadium-removing slag of the crude titanium-aluminum tetrachloride powder with hydrochloric acid and titanium slag washing solution of the above composition for oxidation leaching, wherein the mass ratio of HCl in the hydrochloric acid to the crude titanium-aluminum tetrachloride powder-removing vanadium slag is 0.8:1, and the leaching The temperature is 60°C, the oxidant is sodium hypochlorite, the amount of oxidant added is twice the theoretical amount, the leaching time is 90min, and the leaching rate of V is 98.5% after leaching is completed. Filter the leached slurry to obtain acidic leachate and filter cake. Calcium oxide is added to the acidic leaching solution to adjust the pH value to 2....

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Abstract

The invention relates to a method of recycling vanadium and preparing ferric vanadate from a residue of aluminum powder vanadium removal of crude titanium tetrachloride. The method includes following main steps: (1) performing oxidizing leaching to the residue of the aluminum powder vanadium removal of the crude titanium tetrachloride in hydrochloric acid, and performing liquid-solid separation to the leached substance to respectively obtain titanium residue and a leaching solution; (2) regulating the pH value of the leaching solution to precipitate-out ferric vanadate, and separating and drying the ferric vanadate to obtain the ferric vanadate product, in which the content of vanadium is higher than 20%; (3) further regulating the pH value of a mother liquid after the precipitation of the ferric vanadate to form hydroxide precipitations from iron, aluminum, calcium, magnesium in the mother liquid; (4) evaporating a waste water to recycle chlorides while a secondary steam condensate water is circulated and utilized. In the invention, the valuable ferric vanadate is prepared by recycling the vanadium and meanwhile innocent treatment of the residue of the aluminum powder vanadium removal of the crude titanium tetrachloride is achieved. The titanium residue and the hydroxide precipitations are in conformity with a requirement of permanent stack of common industrial solid wastes.

Description

technical field [0001] The invention relates to a hydrometallurgy or solid waste treatment method, in particular to a method for recovering vanadium from the vanadium-removing slag of crude titanium-aluminum tetrachloride powder and preparing alkali metal ferric vanadate. Background technique [0002] Crude titanium tetrachloride aluminum powder to remove vanadium slag is the slag produced by the chlorination process of crude titanium tetrachloride using aluminum powder to remove vanadium, which is TiCl 4 One of the typical solid wastes in the production process. During the chlorination process, the V in the titanium slag 2 o 5 Chlorinated to generate VOCl 3 . When aluminum powder is added to crude titanium tetrachloride, titanium tetrachloride will react with aluminum powder to produce TiCl 3 , wherein the aluminum trichloride produced after the oxidation of aluminum can play a role in catalyzing the reaction. TiCl 3 VOCl 3 A reaction occurs to form precipitated VOC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00
Inventor 张洋罗开林田颖瞿金为徐红彬杨金成张懿杨立解晶刘珂含张柳方
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI