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A comprehensive utilization method of vanadium-containing leaching solution for removing silicon waste slag

A technology for leachate and silicon waste residue, which is applied in the fields of chemical technology and waste resource utilization, can solve the problems of removing silicon waste residue and pollute the environment, and achieve the effect of improving the recovery rate

Active Publication Date: 2020-11-03
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

[0007] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing a vanadium-containing solution, which solves the problem of environmental pollution caused by silicon removal waste residues, and can be used as a resource to obtain high added value. Aluminum ammonium sulfate products can reduce the consumption of aluminum salts, continuously and stably prepare high-purity vanadium-containing solutions, thereby obtaining high-purity ammonium metavanadate, and then prepare high-purity vanadium pentoxide products with a purity of not less than 99.9%, and Improve the recovery rate of vanadium. In addition, the method has simple process, low cost and less energy consumption

Method used

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  • A comprehensive utilization method of vanadium-containing leaching solution for removing silicon waste slag
  • A comprehensive utilization method of vanadium-containing leaching solution for removing silicon waste slag
  • A comprehensive utilization method of vanadium-containing leaching solution for removing silicon waste slag

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Effect test

Embodiment 1

[0066] A preparation method of vanadium-containing solution, comprising the steps of:

[0067] Weigh 1.5t of silicon removal waste residue (moisture 35%), add 98% sulfuric acid, slurry with liquid-solid ratio 2.6:1, temperature 60°C, control the reaction termination acid concentration 3.2g / L, stir and leaching for 2 hours, and press through the plate and frame The filter is filtered, and the filter residue can be transported to the refractory material factory to produce clay bricks. After the pickling liquid is filtered through the high-molecular PE microporous tube, the ammonium nitrogen in the supernatant liquid of high-purity ammonium metavanadate crystallization is added to prepare the ammonium sulfate solution (NH 4 ) 2 SO 4 , pH is 2.5, concentration is 330g / L, NH 4 + :Al 3+ (Molar ratio) = 1.2:1, pH = 1.5, temperature 60°C, then stir and cool down to 15°C, use a centrifuge to separate and wash, and dry to obtain NH 4 Al(SO 4 ) 2 12H 2 O. Residual Al in mother ...

Embodiment 2

[0069] A preparation method of vanadium-containing solution, comprising the steps of:

[0070] Weigh 1.5t of silicon removal waste residue (moisture 35%), add 98% sulfuric acid, slurry with a liquid-solid ratio of 3:1, temperature 60°C, control the acid concentration at the end of the reaction to 2.8g / L, stir and leaching for 2 hours, and then press through the plate and frame The filter is filtered, and the filter residue can be transported to the refractory material factory to produce clay bricks. After the pickling liquid is filtered through the high-molecular PE microporous tube, the ammonium nitrogen in the supernatant liquid of high-purity ammonium metavanadate crystallization is added to prepare the ammonium sulfate solution (NH 4 ) 2 SO 4 , the pH is 1.5, the concentration is 366g / L, the reaction control NH 4 + :Al 3+ (molar ratio) = 1.24:1, pH = 2, temperature 65°C, then stir and cool down to 12°C, use a centrifuge to separate and wash, and dry to obtain NH 4 Al...

Embodiment 3

[0072] A preparation method of vanadium-containing solution, comprising the steps of:

[0073] Weigh 1.5t of silicon removal waste residue (moisture 35%), slurry with liquid-solid ratio 3.2:1, add 98% sulfuric acid, temperature 60°C, control the reaction termination acid concentration 3.8g / L, stir and leaching for 2 hours, press through plate and frame The filter is filtered, and the filter residue can be transported to the refractory material factory to produce clay bricks. After the pickling liquid is filtered through the high-molecular PE microporous tube, the ammonium nitrogen in the supernatant liquid of high-purity ammonium metavanadate crystallization is added to prepare the ammonium sulfate solution (NH 4 ) 2 SO 4 , pH is 1.0, concentration is 360g / L, reaction control NH 4 + :Al 3+ (Molar ratio) = 1.26:1, pH = 2, temperature 55°C, then stir and cool down to 15°C, use a centrifuge to separate and wash, and dry to obtain NH 4 Al(SO 4 ) 2 12H 2 O. Residual Al in...

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Abstract

The invention provides a preparation method of a vanadium containing solution. The preparation method comprises the following steps that vanadium containing lixivium is subjected to silicon removal and dealumination to obtain the vanadium containing solution and silicon removal waste residues; the silicon removal waste residues are leached through concentrated sulfuric acid to obtain an acid leaching solution; after the acid leaching solution is precisely filtered, silicon residues and an aluminum sulfate solution are obtained; and the aluminum sulfate solution and an ammonium sulfate solutionare mixed, recooling crystallization is carried out after reacting, aluminum ammonium sulfate crystals and crystallization mother liquor are obtained through second solid-liquid separation, and the crystallization mother liquor is used for replacing part or all of aluminum salt to be mixed with a silicon-chrome-silicon containing solution for silicon removal. According to the method, the siliconremoval waste residues can be subjected to resource utilization, and an aluminum ammonium sulfate product high in additional value can be obtained; meanwhile, the consumption of the aluminum salt canbe reduced, high-purity ammonium metavanadate can be prepared continuously and stably, and therefore a high-purity vanadium pentoxide product with the purity not smaller than 99.9% is prepared, and the vanadium recovery rate is increased; and the process is simple, the cost is low, and energy consumption is low.

Description

technical field [0001] The invention belongs to the technical fields of chemical technology and waste resource utilization, and relates to a preparation method of a vanadium-containing solution, in particular to a comprehensive utilization method of a vanadium-containing leaching solution for removing silicon waste residue. Background technique [0002] Vanadium slag is made from vanadium-containing titanium magnetite and other ores through ore dressing, iron smelting, and slag blowing. In vanadium slag, vanadium mainly exists in the form of vanadium-iron spinel. After the vanadium slag is ground and the entrained metal iron is removed, it is mixed with appropriate sodium salt (sodium carbonate, sodium sulfate, etc.) It is oxidized to vanadium pentoxide, and then reacts with sodium salt to generate soluble sodium metavanadate, which is leached with water to obtain a vanadium-containing leaching solution. The vanadium-containing leaching solution contains Cr: 1-2g / L, Si: 0.6...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/22C01F7/76C01G31/00C01G31/02C04B33/138
CPCC01F7/765C01G31/00C01G31/02C04B33/138C22B34/22Y02P40/60
Inventor 宁朋歌曹宏斌王向阳
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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