Method for improving leaching rate of calcification roasting vanadium slag and improving filtering effect

A technology for calcification roasting and filtering effect is applied in the fields of improving the leaching rate of calcification roasting vanadium slag and improving filtering effect, and can solve the problems of increasing labor cost, large total water consumption, low output and input, etc.

Inactive Publication Date: 2015-07-01
CHONGQING UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

In this way, not only the cost of man-hours is increased because of the need for 5 times of washing, but also the cost of materials is increased due to the large amount of water used. In short, the output-input ratio of this prior art is relatively low

Method used

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  • Method for improving leaching rate of calcification roasting vanadium slag and improving filtering effect
  • Method for improving leaching rate of calcification roasting vanadium slag and improving filtering effect
  • Method for improving leaching rate of calcification roasting vanadium slag and improving filtering effect

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Embodiment Construction

[0011] A method for improving the leaching rate of calcified roasted vanadium slag and improving the filtering effect, the method has the following steps:

[0012] (1) Grinding the calcified and roasted vanadium slag (commonly known as: clinker) and mixing it with water to make a pulp; (2) adjusting the acidity of the pulp with sulfuric acid to leach the calcified and roasted vanadium slag; (3) ) filtering and separating the leached ore pulp to obtain vanadium leaching solution and tailings to be washed; (4) leaching the tailings to be washed with water, and collecting washing water;

[0013] Usually, the particle size of the pulverized and roasted vanadium slag should not be greater than 0.12 mm. In the present invention:

[0014] In the case of the slag-washing water collected in step (4), replace the water in step (1) with slag-washing water; when the ratio of vanadium slag and slag-washing water does not meet 0.2~2kg / L , supplemented with water;

[0015] Also added leac...

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Abstract

The invention provides a method for improving the leaching rate of calcification roasting vanadium slag and improving the filtering effect. The method comprises the following steps: (1) crushing the vanadium slag subjected to calcification roasting, and then fully mixing the vanadium slag with water to prepare ore slurry; (2) adjusting the acidity of the ore slurry by using sulfuric acid so as to perform leaching on the vanadium slag subjected to calcification roasting; (3) filtering to separate the ore slurry after leaching so as to obtain vanadium leachate and to-be-washed tailings; and (4) performing drip washing on the to-be-washed tailings by using water, and collecting the slag washing water. The method has the improvement that a small amount of a leaching additive namely polyacrylic acid, sodium citrate, polydimethylsiloxane, potassium sodium tartrate or urea is also added in the ore slurry in the step (1). Compared with the prior art, the method provided by the invention has the advantages that the vanadium leachate is increased, the vanadium leaching rate is improved, and the output-input ratio for recycling the slag washing water is relatively high.

Description

technical field [0001] The invention relates to a method for acid leaching calcified roasted vanadium slag to prepare vanadium leaching solution. Background technique [0002] Vanadium is an important strategic resource, and vanadium oxide has many uses, and is widely used in catalysis, energy storage and other fields. One of the main raw materials for the industrial production of vanadium oxides is vanadium slag, and the traditional process is sodium roasting and water leaching to extract vanadium. With the development of new technologies, the calcification roasting acid leaching vanadium extraction method has gradually matured. This method is to first combine vanadium slag with calcium oxide or salt (CaO, CaCO 3 etc.) are mixed together and roasted under an oxidizing atmosphere to obtain acid-soluble calcium vanadate (CaV 2 o 6 , Ca 3 V 2 o 8 etc.) of calcified roasted vanadium slag; then mix the calcified roasted vanadium slag with water to make a slurry, and then u...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B34/22
CPCY02P10/20
Inventor 刘作华陈嫚丽陶长元杜军范兴周小霞阿依努尔·努尔艾合买提彭浩刘仁龙谢昭明唐金晶孔令峰左赵宏杨其文
Owner CHONGQING UNIV
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