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Method for treating stone coal acid leaching solution

A technology of coal acid and leaching liquid, applied in chemical instruments and methods, aluminum sulfate, inorganic chemistry, etc., can solve the problems of unsystematic treatment process, poor removal or recovery effect, etc., and achieve the effect of high purity

Active Publication Date: 2018-11-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Claims
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Problems solved by technology

[0009] Aiming at problems such as unsystematic treatment of vanadium and associated components in the stone coal acid leaching solution existing in the prior art, and poor removal or recovery effects, the object of the present invention is to provide a method for processing the stone coal acid leaching solution. The method has the advantages of high purity of vanadium products, efficient separation of valuable components, low process cost, simple operation, clean and environmental protection, etc.

Method used

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  • Method for treating stone coal acid leaching solution

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Experimental program
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Effect test

Embodiment 1

[0167] Such as figure 1 As shown, the stone coal acid leaching solution is processed according to the following steps:

[0168] (1) Primary crystallization: cooling and crystallizing the stone coal pickling solution at 40° C., separating solid and liquid to obtain alum and filtrate.

[0169] (2) Primary purification: the filtrate obtained in step (1) is first adjusted to pH 2, and then sodium persulfate, potassium thiosulfate, potassium sulfide, potassium pyrosulfite, sodium hydrosulfide, ammonium sulfide and ammonium bisulfite are added Adjust the redox potential of the solution to 550mV, and finally add sodium bisulfate to adjust the sulfate concentration in the solution to 0.1mol / L. Uranium-rich resin and molybdenum-enriched resin and effluent are obtained by adsorption with amine extraction and leaching resin, and the concentration of uranium and molybdenum in the effluent is less than 0.4ppm. The uranium-rich and molybdenum resins are respectively desorbed twice through...

Embodiment 2

[0178] (1) Primary crystallization: Add sodium sulfate, ammonium bisulfate, ammonium bicarbonate and potassium bicarbonate to the stone coal acid leaching solution, so that the aluminum in the acid leaching solution forms alum (MAl(SO 4 ) 2 12H 2 O, M is K + , NH 4 + 、Na + ) and iron to form jarosite NFe 3 (SO 4 ) 2 (OH) 6 (N is Na + , NH 4 + 、K + ) to meet 5 times of the theoretical amount, cooling and crystallization at room temperature (20° C.), solid-liquid separation, and obtaining alum and filtrate.

[0179] (2) One-level purification: the pH of step (1) gained filtrate is first adjusted to be 1.8, then add sodium persulfate, potassium persulfate, sodium thiosulfate, sodium sulfide, potassium sulfite, potassium hydrosulfide, ammonium hydrosulfide and Potassium bisulfite adjusted the redox potential of the solution to 710mV, and finally added ammonium sulfate and sodium sulfate to adjust the sulfate concentration in the solution to 0.3mol / L. Uranium-rich res...

Embodiment 3

[0188] (1) Primary crystallization: ammonium sulfate, ammonium carbonate and ammonium bicarbonate are added to the acid leaching solution of stone coal, so that the aluminum in the acid leaching solution forms alum (MAl(SO 4 ) 2 12H 2 O, M is K + , NH 4 + 、Na + ) and iron to form jarosite NFe 3 (SO 4 ) 2 (OH) 6 (N is Na + , NH 4 + 、K + ) satisfying 0.1 times of the theoretical amount, cooling and crystallization at 0°C, solid-liquid separation, and obtaining alum by-products and filtrate.

[0189] (2) Primary purification: firstly adjust the pH of the filtrate obtained in step (1) to be 1, then feed sulfur dioxide, add hydrogen peroxide to adjust the redox potential of the solution to be 750mV, and finally add potassium sulfate to adjust the sulfate concentration in the solution to be 0.5mol / L . The uranium-rich and molybdenum-rich resin and the effluent are obtained by adsorption with a neutral extraction resin, and the concentrations of uranium and molybdenum i...

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Abstract

The invention provides a method for treating a stone coal acid leaching solution. The method comprises the steps that (1) primary crystallization is conducted to obtain by-product alum; (2) first-stage purification is conducted to separate and recover molybdenum and uranium; (3) second-stage purification is conducted to recover iron deposits; (4) vanadium is enriched through resin ion exchange; (5) third-stage purification is conducted to obtain phosphorus, silicon and arsenic; (6) an ammonium vanadate product is precipitated through ammonium salt; (7) fourth-stage purification is conducted toselectively recover heavy metal; and (8) secondary crystallization is conducted to obtain by-product magnesium nitrogen double salt, and water is reused. According to the method, solution oxidation reduction potential is controlled, multiple metal valuable components are separated and recovered through an adsorption method and a crystallization method, harmful components are purified and separated through an adsorption method, the main-product ammonium vanadate product is high in purity, and meanwhile, multiple by-products are co-produced; sodium sulfate and ammonia-nitrogen wastewater are not generated, and the process water is fully recycled; and the method has the advantages that the vanadium product is high in purity, the valuable components are efficiently separated, the process costis low, operation is easy, and the clean and environment-friendly effects are achieved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and vanadium chemical industry, and in particular relates to a method for treating stone coal acid leaching solution. Background technique [0002] Stone coal is a vanadium-containing polymetallic mineral resource and one of the main raw materials for extracting vanadium. In addition to vanadium, stone coal often contains aluminum, potassium, iron, calcium, magnesium, molybdenum, nickel, cobalt, copper, and titanium. , chromium, uranium, silver, selenium and other associated elements. At present, the methods for extracting vanadium from stone coal mainly include two categories: roasting method and acid leaching method. Due to the high content of carbon, sulfur, nitrogen and other elements in stone coal, and the fluctuation of these organic elements, the roasting process is unstable, resulting in serious pollution and low vanadium recovery rate in the roasting method for vanadium extractio...

Claims

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Application Information

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IPC IPC(8): C22B60/02C22B34/34C22B34/22C22B26/22C22B26/10C22B21/00C22B30/04C01G31/00C01F7/76C01G43/00C01G39/00C01G49/02C01F5/00
CPCC01F5/00C01F7/762C01G31/00C01G39/00C01G43/00C01G49/02C22B21/0015C22B26/10C22B26/22C22B30/04C22B34/22C22B34/34C22B60/0265
Inventor 董玉明李会强张笛裴丽丽张红玲徐红彬张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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