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A method for treating stone coal acid leaching solution

A technology of coal acid and leaching solution, applied in the fields of hydrometallurgy and vanadium chemical industry, can solve the problems of unsystematic treatment process, poor removal or recovery effect, etc., and achieve the effect of high purity

Active Publication Date: 2020-11-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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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.

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  • A method for treating stone coal acid leaching solution

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Effect test

Embodiment 1

[0181] Such as figure 1 As shown, the stone coal acid leaching solution is processed according to the following steps:

[0182] (1) Primary crystallization: cooling and crystallizing the stone coal pickling solution at 40° C., separating solid and liquid to obtain alum and filtrate.

[0183](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

[0193] Such as figure 1 As shown, the stone coal acid leaching solution is processed according to the following steps, without five-stage purification operation:

[0194] (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 + ) meets 5 times of the theoretical amount, cooling and crystallization at room temperature, solid-liquid separation, and obtaining alum and filtrate.

[0195] (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 ...

Embodiment 3

[0204] (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.

[0205] (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 disposing stone coal pickle liquid. The method includes the following steps of (1) conducting crystal separation to obtain alum, a byproduct; (2) conducting adsorption separation on recycled molybdenum and uranium; (3) purifying recycled iron sediment; (4) using resin ions for exchange of enriched vanadium; (5) purifying phosphorus, silica and arsenic; (6) usingammonium salts for settling of ammonium vanadate products; (7) selectively recycling heavy metal and deeply de-alkalized selective metal / ammonia nitrogen; (8) crystalizing byproducts including magnesium sulfate, compound magnesium and nitrogen salts and water for reuse. According to the provided method for disposing the stone coal pickle liquid, by controlling redox potential of solutions, adopting an adsorption method and a crystallization method for separating and recycling various metal components with chemical valences and adopting an adsorption method for purifying and separating harmfulcomponents, the purity of ammonium vanadate of main products is high. Meanwhile, through cogeneration of various byproducts without generation of sodium sulfate and ammonia-nitrogen wastewater, process water can be completely recovered, and the method has the advantages that the purity of the vanadium products is high, efficient separation of valent components is achieved, the process cost is low, the operation is simple, and the method is clean and environmentally friendly.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/22C22B3/24C22B3/44C22B34/22
CPCC22B3/22C22B3/24C22B3/44C22B34/22
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