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Method for extracting vanadium from vanadium solution through vanadium slag sodium salt roasting vanadium extraction process

A technology of sodium roasting and vanadium liquid is applied in the field of vanadium chemical industry and metallurgy, which can solve the problems of increasing the vanadium extraction rate, only 80%, polluting the environment, etc., and achieves the effect of simplifying the production process and reducing the energy consumption cost.

Inactive Publication Date: 2015-06-10
HEBEI IRON AND STEEL
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Problems solved by technology

[0003] The main disadvantages of this process are: (1) vanadium in vanadium slag mainly exists in the structure of vanadium-iron spinel, and the chemical mineral phase is stable and difficult to decompose; in the gas-solid roasting reaction process, the oxygen mass transfer effect is poor, even if more Sub-high-temperature roasting, the single-pass recovery rate of vanadium is only 80%; this process cannot avoid this deficiency
(2) Vanadium slag contains more silicon-containing low-melting point substances, increasing the reaction temperature will cause ring formation, affect the operation of the kiln, and limit the further increase of the reaction temperature, so it is difficult to increase the extraction rate of vanadium by increasing the temperature
(3) The ammonium precipitation process will produce a large amount of high-salinity, ammonia nitrogen-containing wastewater, and the wastewater generated per unit of vanadium product (calculated as vanadium pentoxide) is about 40 tons, seriously polluting the environment; the cost of treating vanadium-chromium wastewater per ton is 3,000 yuan left and right, the cost of governance is high
[0006] In view of the fact that the existing vanadium slag sodium roasting-water leaching vanadium extraction utilization technology progress is difficult to meet the strategic requirements of vanadium chemical industry clean production, so it is necessary to develop a method to realize the efficient recovery of vanadium in vanadium liquid from the source, and develop vanadium extraction vanadium liquid to solve environmental pollution Cleaner Production Technology

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  • Method for extracting vanadium from vanadium solution through vanadium slag sodium salt roasting vanadium extraction process

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Effect test

Embodiment 1

[0024] Embodiment 1: the method technological step of vanadium extraction vanadium liquid of this vanadium slag sodiumization roasting vanadium extraction process is as follows:

[0025] (1) Calcification of vanadium precipitation: add milk of lime to the vanadium solution, the dosage (calculated as CaO) is 0.35mol, the content of (V+Si+P) in the liquid phase is 0.58mol, the temperature of vanadium precipitation is 50°C, and the reaction is 0.5 h , the calcium vanadate that obtains TV content is 22%;

[0026] (2) Acidification and transsolution: add calcium vanadate to sulfuric acid solution for transsolution, adjust the pH value of the transsolution process to 5.0, and obtain vanadium liquid and gypsum with a TV concentration of 30g / L. The reaction temperature during the transsolution process is 40°C and the reaction time is 10 min, the liquid-solid ratio of the solution process is 5:1;

[0027] (3) Purification and removal of impurities: adding aluminum sulfate to the vanad...

Embodiment 2

[0030] Embodiment 2: the method technological step of vanadium extraction vanadium liquid of this vanadium slag sodiumization roasting vanadium extraction process is as follows:

[0031] (1) Calcification of vanadium precipitation: Add quicklime to the vanadium liquid, the dosage (calculated as CaO) is 0.92 mol, the content of (V+Si+P) in the liquid phase is 0.61 mol, the temperature of vanadium precipitation is 80°C, and the reaction is 0.5 h. Obtaining TV content is the calcium vanadate of 20%;

[0032] (2) Acidification, transsolution and impurity removal: add calcium vanadate to sulfuric acid solution for transsolution, and add aluminum sulfate to the system to remove impurities, adjust the pH value of the system to 6.0, and obtain vanadium liquid and silicon-calcium slag with a TV concentration of 40g / L. The reaction temperature in the solution-removal process was 80°C, the reaction time was 20 minutes, and the liquid-solid ratio in the solution process was 10:1;

[0033...

Embodiment 3

[0035] Embodiment 3: The process steps of the method for extracting vanadium in this vanadium slag sodium roasting vanadium extracting process are as follows:

[0036] (1) Calcification of vanadium precipitation: add milk of lime to the vanadium solution, the dosage (calculated as CaO) is 1.00 mol, the content of (V+Si+P) in the liquid phase is 0.50 mol, the temperature of vanadium precipitation is 40°C, and the reaction is 0.5 h , the calcium vanadate that obtains TV content is 21%;

[0037] (2) Acidification and transsolution: add calcium vanadate to sulfuric acid solution for transsolution, adjust the pH value of the transsolution process to 7.0, and obtain vanadium liquid and gypsum with a TV concentration of 20g / L. The reaction temperature during the transsolution process is 70°C and the reaction time is 10 min, the liquid-solid ratio in the solution conversion process was 8:1;

[0038] (3) Purification and removal of impurities: adding aluminum hydroxide to the vanadium...

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Abstract

The invention discloses a method for extracting vanadium from a vanadium solution through a vanadium slag sodium salt roasting vanadium extraction process. The method comprises the following steps: (1) adding calcium to deposit vanadium into the vanadium solution obtained by a vanadium slag sodium salt roasting-water leaching vanadium extraction process, thereby obtaining calcium vanadate; (2) performing solution conversion on the calcium vanadate by using a sulfuric acid solution; (3) removing impurities in the conversion solution, thereby obtaining a purified vanadium solution; and (4) regulating the pH value of the purified vanadium solution, precipitating under normal pressure to obtain a red cake, dehydrating, and drying, thereby obtaining a powdered vanadium product. According to the method for precipitating vanadium through calcification of a vanadium solution, acidifying for solution conversion and hydrolyzing to precipitate the vanadium, an ammonium salt is not added in the process, the solution subjected to calcification and vanadium precipitation and the solution subjected to hydrolysis and vanadium precipitation can be recycled, closed medium loop and zero wastewater emission can be realized, and a clean production method is realized. According to the method, the conventional vanadium chemical industry production process is simplified, the steps of ammonium salt vanadium precipitation and ammonium vanadate deamination are not needed, and the raw materials and energy consumption cost are greatly reduced; and moreover, the content of the vanadium product sigma(Na2O+K2O) obtained by the method is less than 0.1 percent.

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 extracting vanadium from vanadium liquid in a process of vanadium extracting vanadium by sodium roasting of vanadium slag. Background technique [0002] The traditional method of vanadium pentoxide production is vanadium slag sodium roasting-ammonium salt vanadium precipitation method, of which more than 65% of vanadium products come from this method. There are two kinds of ammonium salt precipitation methods: one is to adjust the pH value of the solution containing pentavalent vanadium to 8.5~9.5, and then press V in the solution to 2 o 5 The mass ratio of ammonium salt to ammonium salt is 1:1.3~1.5, adding ammonium salt to precipitate ammonium metavanadate; the other is to adjust the pH value of the solution step by step to 1.5~2.5, adding ammonium salt to precipitate ammonium polyvanadate, and then The obtained ammon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B34/22C22B3/44
CPCY02P10/20
Inventor 李兰杰陈东辉白瑞国杜浩郑诗礼
Owner HEBEI IRON AND STEEL
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