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Method for pre-de-siliconization of vanadium slag by soda-lime roasting
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A technology of soda lime and pre-desilication, applied in the field of vanadium chemical metallurgy, to achieve the effect of reducing cost, reducing vanadium loss and shortening the process flow
Active Publication Date: 2021-05-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Patent document CN 108130425 A discloses a method for pretreatment of vanadium slag desiliconization and medium circulation. Firstly, coarse crushed vanadium slag is mixed with calcium-containing material and alkaline medium, and wet ball milled. After ball milling, vanadium slag is mixed with iron Then, desiliconize the vanadium slag slurry after iron separation to obtain the desiliconized slurry; the desiliconized slurry undergoes natural sedimentation to separate the alkaline medium and refined vanadium slag. The alkaline medium returns to the first step. The method of the invention can remove the silicon in the vanadium slag to Si<0.5%. However, after sodium roasting-water immersion, it is necessary to further remove the impurity Si in the leaching solution.
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Embodiment 1
[0039] With vanadium slag fine powder 100g, add Na 2 CO 3 20g, CaCO 3 1g, mixed and ground to obtain raw meal; then placed in a muffle furnace for roasting, the sintering temperature was 800°C, and the sintering time was 180min to obtain clinker; after the clinker was broken, it was soaked in water, and the ratio of immersion liquid to solid was 2:1 (mL / g), the leaching temperature is 60°C, the leaching time is 30min, and the qualified vanadium liquid is obtained by filtration. The V content in tailings is 0.92%, c(P)<0.01g / L, c(Si)=0.103g / L in qualified vanadium liquid. From vanadium slag to qualified vanadium liquid, the vanadium yield is 92.17%.
Embodiment 2
[0041] With vanadium slag fine powder 200g, add Na 2 CO 3 50g, CaCO 3 6g, mixed and ground to obtain raw meal; then placed in a muffle furnace for roasting, the sintering temperature was 1000°C, and the sintering time was 120min to obtain clinker; after the clinker was broken, it was soaked in water, and the ratio of immersion liquid to solid was 3:1 (mL / g), the leaching temperature is 90°C, the leaching time is 10min, and the qualified vanadium liquid is obtained by filtration. The V content in tailings is 0.95%, c(P)<0.01g / L and c(Si)=0.125g / L in qualified vanadium liquid. From vanadium slag to qualified vanadium liquid, the vanadium yield is 91.85%.
Embodiment 3
[0043] Take 500g of vanadium slag fine powder, add Na 2 CO 3 150g, CaCO 325g, mixed and ground to obtain raw meal; then placed in a muffle furnace for roasting, the sintering temperature was 1200°C, and the sintering time was 60min to obtain clinker; after the clinker was broken, it was soaked in water, and the ratio of immersion liquid to solid was 4:1 (mL / g), the leaching temperature is 30°C, the leaching time is 60min, and the qualified vanadium liquid is obtained by filtration. The V content in tailings is 0.96%, c(P)<0.01g / L, c(Si)=0.118g / L in qualified vanadium liquid. From vanadium slag to qualified vanadium liquid, the vanadium yield is 91.23%.
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Abstract
The invention belongs to the technical field of vanadium chemical industry and metallurgy, and in particular relates to a method for pre-desiliconizing vanadium slag soda lime roasting. The technical problem to be solved by the present invention is to provide a method for pre-desilication and phosphorus removal of vanadium slag soda lime roasting with short process flow and effective impurity removal. The method comprises the following steps: a. mixing vanadium slag, alkali and calcified matter, and ball milling to obtain raw meal; b. roasting the raw meal to obtain clinker; c. soaking the clinker in water after crushing, and filtering to obtain qualified vanadium liquid . The method of the invention omits the solution impurity removal process in the process of vanadium extraction by sodium slag, shortens the process flow and reduces the loss of vanadium.
Description
technical field [0001] The invention belongs to the technical field of vanadium chemical industry and metallurgy, and in particular relates to a method for pre-desiliconizing vanadium slag soda lime roasting. Background technique [0002] Vanadium is a rare metal widely used in steel, aerospace, petrochemical and other industries. It is an important strategic resource indispensable for the development of modern industry, modern national defense and modern science and technology. Vanadium slag, stone coal and vanadium-containing solid waste are the main raw materials for vanadium extraction in my country's vanadium chemical industry, and vanadium extraction from vanadium slag occupies a dominant position. The techniques for extracting vanadium from vanadium slag include sodium roasting, calcification roasting, pressurized acid leaching and sub-molten salt method, etc. Among them, sodium roasting is developed relatively early and is currently widely used mainly for the product...
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