Recycling method of raffinate during vanadium extraction from stone coal

A technology for raffinate and stone coal is applied in the field of recycling of vanadium raffinate extraction from stone coal, which can solve the problems of waste of resources, large lime, inability to recover, etc., and achieve the effect of saving treatment costs and low costs.

Inactive Publication Date: 2012-11-21
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

Although this method can greatly reduce the concentration of impurity ions and achieve the purpose of wastewater reuse, it will consume a large amount of lime, which will bring a certain economic burden to the entire vanadium extraction process from stone coal, and cannot effectively utilize the raffinate. h + (2) A part of the raffinate is directly returned to the acid leaching operation, and the other part is discharged after wastewater treatment. This method also needs to carry out follow-up wastewater treatment, which brings economic burden to the stone coal vanadium extraction process, resulting in (3) The raffinate is combined with other waste water produced by the stone coal vanadium extraction process and then discharged through wastewater treatment, or partly reused in the stone coal vanadium extraction process. This method will also increase the cost of stone coal extraction. The economic burden of the vanadium process, and the V and H in the raffinate cannot be recovered +

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  • Recycling method of raffinate during vanadium extraction from stone coal

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Embodiment 1

[0023] A method for recycling the raffinate of vanadium extraction from stone coal. Its specific steps are:

[0024] (1) The stone coal raw ore is acid-leached with sulfuric acid solution after being crushed and ground to obtain acid-leached pulp; The immersion time is 4~6 hours, and the liquid-solid mass ratio of acid leaching is (1.5~2):1;

[0025] (2) Carry out solid-liquid separation for the first time with acid leaching pulp, obtain acid leaching liquid and acid leaching residue;

[0026] (3) Use milk of lime to adjust the pH value of the pickling solution to 1.5-2.0 to obtain the adjusted emulsion, and then perform a second solid-liquid separation on the adjusted emulsion to obtain the original solution and calcium-rich slag;

[0027] (4) extract the raw liquid with the organic phase to obtain the mixed phase, and then separate it by standing to obtain the loaded organic phase and raffinate;

[0028] (5) First use the raffinate to prepare acid, and the prepared sulfur...

Embodiment 2

[0031] A method for recycling the raffinate of vanadium extraction from stone coal. Its specific steps are:

[0032] (1) The stone coal raw ore is acid-leached with sulfuric acid solution after crushing and grinding to obtain acid-leached pulp; the acid-leaching conditions are: the volume concentration of sulfuric acid solution is 15-20%, the acid-leaching temperature is 95-100°C, and the acid-leaching pulp is obtained. The immersion time is 3~5 hours, and the liquid-solid mass ratio of acid leaching is (1~1.5):1;

[0033] (2) Carry out solid-liquid separation for the first time with acid leaching pulp, obtain acid leaching liquid and acid leaching residue;

[0034] (3) Use milk of lime to adjust the pH value of the pickling solution to 2~2.5 to obtain the adjusted emulsion, and then perform a second solid-liquid separation on the adjusted emulsion to obtain the original solution and calcium-rich slag;

[0035] (4) extract the raw liquid with the organic phase to obtain the ...

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Abstract

The invention relates to a recycling method of raffinate during the vanadium extraction from stone coal. The method adopts the technical scheme that (1), raw ore of the stone coal is subjected to pickling after being crushed and grinded, so as to obtain pickling ore pulp; (2), the pickling ore pulp is subjected to first solid-liquid separation to obtain pickle liquor and pickling sludge; (3), the pH value of the pickle liquor is regulated to 1.5-2.5 through lime milk so as to obtain the regulated emulsion, and the regulated emulsion is subjected to second solid-liquid separation so as to obtain an extract liquid and calcium-rich sludge; (4), a mixed phase is obtained through extracting the extract liquid by an organic phase and is then subjected to stationary separation so as to obtain a load organic phase and the raffinate; and (5), the sulfuric acid solution is prepared through combining the raffinate with the acid so as to be used for pickling, and the residual raffinate is used for the first solid-liquid separation. The method has the characteristics of zero raffinate discharge and low cost.

Description

technical field [0001] The invention relates to the technical field of raffinate for extracting vanadium from stone coal. In particular, it relates to a method for recycling the raffinate of vanadium extraction from stone coal. Background technique [0002] Stone coal is an important vanadium-containing resource in my country. Extracting vanadium from stone coal is an important way to obtain vanadium in my country. At present, the process of acid leaching-extraction-stripping-vanadium-precipitation-calcination is mostly used for extracting vanadium from stone coal. The extraction stage of the process produces a large amount of raffinate. The raffinate is an acidic liquid in which the concentration of impurity ions is high, exceeding the national industrial wastewater discharge standards; and it also contains a certain concentration of H + and V. If the raffinate is directly discharged, it will cause serious environmental pollution and waste of resources. [0003] At prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B3/40C22B34/22
CPCY02P10/20
Inventor 张一敏张国斌刘涛黄晶陈铁军包申旭
Owner WUHAN UNIV OF SCI & TECH
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