Clean method for extracting vanadium during roasting vanadium slag

A technology of roasting and vanadium slag, applied in the field of vanadium chemical metallurgy, can solve the problems of high price, high cost, unsuitable for large-scale industrial application, etc., and achieve the effect of improving recovery rate, high conversion rate, good economic benefits and application prospects

Inactive Publication Date: 2019-11-05
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

CN103146930A proposes a method for leaching ammonium oxalate by calcification and roasting of vanadium slag. Although the volatility of ammonium oxalate is small, ammonium oxalate

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  • Clean method for extracting vanadium during roasting vanadium slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Such as figure 1 Shown, the present invention carries out extracting vanadium according to the following method:

[0057] (1) Lime and vanadium slag according to CaO:V 2 o 5 =The molar ratio of 1:1 is mixed evenly, and high-temperature roasting is carried out in a rotary kiln, the roasting temperature is 900°C, and the roasting time is 1h;

[0058] (2) Add the calcined clinker to the ammonium sulfate solution for ammonization, and the NH in the solution 4 + The concentration is 50g / L, the ammonization temperature is 80°C, the liquid-solid mass ratio is 3:1, and the ammonization time is 0.1h. After the reaction is completed, filter to obtain the ammonium metavanadate concentration of 2g / L after ammonium liquid and Contains crystal slag;

[0059] (3) Perform three-stage countercurrent washing on the crystal-containing slag with washing water 0.5 times its dry basis weight, mix the lotion with the ammonized liquid, add the washed crystal-containing slag to hot liquid ...

Embodiment 2

[0063] (1) Lime and vanadium slag according to CaO:V 2 o 5 = 1.2:1 molar ratio mixed evenly, high-temperature roasting in a rotary kiln, the roasting temperature is 800 ℃, and the roasting time is 0.8h;

[0064] (2) Add the calcined clinker to the ammonium sulfate solution for ammonization, and the NH in the solution 4 + The concentration is 40g / L, the ammonization temperature is 82°C, the liquid-solid mass ratio is 3.5:1, and the ammonization time is 0.2h. After the reaction is completed, filter to obtain the ammonium metavanadate concentration of 1.6g / L. and crystalline slag;

[0065] (3) Use 0.55 times the dry weight of the washing water to perform three-stage countercurrent washing on the crystal-containing slag, mix the lotion with the ammonized liquid, add the washed crystal-containing slag to hot liquid for leaching, and the leaching temperature is 85°C , the leaching time is 2.4h, after the leaching is completed, filter to obtain a vanadium-containing solution, and...

Embodiment 3

[0069] (1) Lime and vanadium slag according to CaO:V 2 o 5 =1.7:1 molar ratio mixed evenly, high-temperature roasting in the rotary kiln, the roasting temperature is 850 ℃, and the roasting time is 0.5h;

[0070] (2) Add the calcined clinker to the ammonium sulfate solution for ammonization, and the NH in the solution 4 + The concentration is 50g / L, the ammonization temperature is 85°C, the liquid-solid mass ratio is 4.6:1, and the ammonization time is 0.3h. After the reaction is completed, filter to obtain the ammonium metavanadate concentration of 1g / L. Contains crystal slag;

[0071] (3) Perform three-stage countercurrent washing on the crystal-containing slag with washing water 0.5 times its dry basis weight, mix the washing liquid with the ammonized liquid, add the washed crystal-containing slag to hot liquid for leaching, and the leaching temperature is 90°C , the leaching time is 2.2h, after the leaching is completed, filter to obtain a vanadium-containing solution,...

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Abstract

The invention relates to a clean method for extracting vanadium during roasting vanadium slag. The method comprises the following steps that vanadium in the vanadium slag is converted into calcium vanadate which is stable at high temperature by adopting a calcification roasting method, high-concentration ammonium sulfate and/or ammonium bisulfate solution are utilized for leaching roasted clinkerto enable most of ammonium metavanadate to be crystallized and then to be mixed with tailings to form crystal-containing slag, then the crystal-containing slag is dissolved in a hot liquid to obtain avanadium-containing solution, and efficient extraction of the vanadium can be realized. According to the method, the problem of high-temperature vanadium volatilization does not exist, the comprehensive recovery rate of the vanadium is higher, ammonia gas is not generated in the leaching process, and compared with other easily-decomposed ammonium salts, the conversion rate of the vanadium is higher under the same concentration and the same leaching temperature; and meanwhile, the problems of small solubility of ammonium metavanadate in the ammonium salt solution and low vanadium extraction rate can be effectively solved. In the subsequent processes, ammonia gas generated by calcining ammonium metavanadate is adsorbed by using a sulfuric acid solution, the ammonium sulfate can be resynthesized, the ammonia recycling can be realized, the whole process is clean, the production cost is greatly reduced, and the method has good economic benefit and application prospect.

Description

technical field [0001] The invention relates to the technical field of vanadium chemical industry and metallurgy, in particular to a method for cleaning and extracting vanadium by roasting vanadium slag. Background technique [0002] The traditional method for extracting vanadium from vanadium slag is the roasting-water leaching method to extract vanadium, among which the vanadium slag sodium roasting-water leaching vanadium extraction is the mainstream method for vanadium extraction. The method is to use sodium salt additives (such as table salt, Glauber's salt, soda ash, etc.) to help trivalent vanadium oxidize to pentavalent vanadium and convert it into soluble vanadate. The sodium roasting process needs to consume a large amount of sodium salt, and the recovery rate of vanadium is low. The recovery rate of vanadium in a single roasting is about 70%, and the recovery rate of vanadium after multiple roasting is only 80%. Multiple roasting is required, and the energy consum...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B3/14C22B34/22
CPCC22B1/02C22B3/14C22B34/22Y02P10/20
Inventor 杜浩刘彪王少娜
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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