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Method for crystallizing and separating ammonium metavanadate in ammonium vanadium slag leaching solution

A technology of ammonium metavanadate and ammonium leaching of vanadium slag, which is applied in the field of vanadium chemical metallurgy, can solve the problems of ineffective recovery of vanadium, and achieve the effects of easy control, high vanadium crystallization rate, and solution to vanadium loss

Active Publication Date: 2015-01-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problem that the vanadium in the vanadium slag ammonium leaching solution cannot be effectively recovered in the prior art, and a method for crystallizing and separating ammonium metavanadate from the vanadium slag ammonium leaching solution is provided

Method used

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  • Method for crystallizing and separating ammonium metavanadate in ammonium vanadium slag leaching solution
  • Method for crystallizing and separating ammonium metavanadate in ammonium vanadium slag leaching solution
  • Method for crystallizing and separating ammonium metavanadate in ammonium vanadium slag leaching solution

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Embodiment 1

[0030] The vanadium slag ammonium immersion slurry used in this embodiment mainly includes vanadium slag, ammonium metavanadate and ammonium bicarbonate, and the slurry undergoes the following three steps in sequence to prepare ammonium metavanadate crystals.

[0031] (1) enrichment: 500mL temperature is 70 ℃, V 2 o 5 The vanadium slag ammonium immersion slurry with a concentration of 15.72g / L and an ammonium ion concentration of 68.35g / L was cooled and stirred for 3 hours, the temperature was lowered to 25°C, and then the slurry was subjected to liquid-solid separation to obtain vanadium slag and filtrate. Wherein the ammonium metavanadate crystal is enriched in the slag, and the filtrate volume is 490mL, V 2 o 5 The concentration is 5.01g / L, the ammonium ion concentration is 60.11g / L, and the filtrate is used for the next ammonium leaching test.

[0032] (2) Washing: 500mL V 2 o 5 The vanadium-containing solution with a concentration of 3.21g / L and an ammonium ion conce...

Embodiment 2

[0040] The vanadium slag ammonium immersion slurry used in this embodiment mainly includes vanadium slag, ammonium metavanadate and ammonium carbonate, and the slurry undergoes the following three steps in sequence to prepare ammonium metavanadate crystals.

[0041] (1) enrichment: 500mL temperature is 90 ℃, V 2 o 5 The vanadium slag ammonium immersion slurry with a concentration of 32.1g / L and an ammonium ion concentration of 91.14g / L was cooled and stirred for 4 hours, the temperature dropped to 45°C, and then the slurry was subjected to liquid-solid separation to obtain vanadium slag and filtrate. Wherein the ammonium metavanadate crystal is enriched in the slag, and the filtrate volume is 493mL, V 2 o 5 The concentration is 6.83g / L, the ammonium ion concentration is 90.05g / L, and the filtrate is used for the next ammonium leaching test.

[0042] (2) Washing: 500mL V 2 o 5 The vanadium-containing solution with a concentration of 4.22g / L and an ammonium ion concentratio...

Embodiment 3

[0049] The vanadium slag ammonium immersion slurry used in this embodiment mainly includes vanadium slag, ammonium metavanadate and ammonium sulfate, and the slurry undergoes the following three steps in order to prepare ammonium metavanadate crystals.

[0050] (1) enrichment: 500mL temperature is 78 ℃, V 2 o 5 The vanadium slag ammonium immersion slurry with a concentration of 25.78g / L and an ammonium ion concentration of 27.34g / L was cooled and stirred for 0.5h, the temperature dropped to 15°C, and then the slurry was subjected to liquid-solid separation to obtain vanadium slag and filtrate. Wherein the ammonium metavanadate crystal is enriched in the slag, and the filtrate volume is 490mL, V 2 o 5 The concentration is 8.45g / L, the ammonium ion concentration is 26.09g / L, and the filtrate is used for the next ammonium leaching test.

[0051] (2) Washing: 500mL V 2 o 5 The vanadium-containing solution with a concentration of 10.39g / L and an ammonium ion concentration of 2...

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Abstract

The invention provides a method for crystallizing and separating ammonium metavanadate in an ammonium vanadium slag leaching solution, which comprises the following steps: 1)enriching: cooling the ammonium metavanadate in ammonium vanadium slag leaching solution, precipitating ammonium metavanadate and enriching in the slag, crystallizing a mother liquor for cycle utilization and leaching to obtain the vanadium slag; 2)washing: heating an initial vanadium solution with low ammonium and low vanadium to high temperature, stirring by the solution and washing the vanadium-containing vanadium slag, fully dissolving vanadium in a slag phase, insulating and filtering; 3)crystallizing: adding ammonium salt in the vanadium-containing solution, precipitate ammonium metavanadate crystals from the vanadium crystal in a liquid phase through salt precipitation and crystallization-cooling steps, and filtering and circularly washing the mother liquor. The ammonium metavanadate is prepared by employing a crystallization-remelting-recrystallization method, solubility and crystallization rate of vanadium are increased, crystallization operation space of ammonium metavanadate is increased, and invention provides a high-efficiency crystallization method for leaching ammonium vanadium slag. The whole crystallization technology has the advantages of short process and simple operation. The crystal purity of the prepared ammonium metavanadate crystal is greater than 98%, and the crystallization rate is greater than 70%.

Description

technical field [0001] The invention belongs to the technical field of vanadium chemical metallurgy, and in particular relates to a method for crystallizing and separating ammonium metavanadate from vanadium slag decomposition liquid. Background technique [0002] Vanadium slag is an important raw material for vanadium extraction. The mainstream vanadium extraction process is the roasting-water immersion process, using sodium salts such as soda ash, table salt, and Glauber’s salt as additives. Vanadium is oxidized to pentavalent vanadium, and pentavalent vanadium is water-soluble. Sodiumized roasted clinker is directly soaked in water to obtain a vanadium-containing leaching solution, and then ammonium salt is added to form ammonium meta / polyvanadate, and ammonium meta / polyvanadate is roasted at high temperature to obtain the product Vanadium pentoxide. The vanadium recovery rate of this process is low, the energy consumption is high, and HCl, Cl 2 and other toxic and harm...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/22
CPCY02P10/20
Inventor 杜浩刘彪郑诗礼王少娜李猛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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