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Sodium vanadate crystallization system and method

A crystallization system, sodium vanadate technology, applied in the field of vanadium chemical industry, achieves good application prospects, efficient operation, and improved efficiency

Inactive Publication Date: 2017-11-24
HEBEI IRON AND STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no mature system for the crystallization of sodium vanadate under high alkali system in China. Therefore, it is urgent to develop a sodium vanadate crystallization system to solve the above problems

Method used

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  • Sodium vanadate crystallization system and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A sodium vanadate crystallization system, comprising: a buffer tank 1, a heat exchanger 2, a crystallizer 3, a thickener 4, a magma storage tank 5, a filter press 6 and a mother liquor tank 7 arranged in sequence, the mother liquor tank 7 is connected with thickener 4.

[0035] A delivery pump is arranged between the buffer tank 1 and the heat exchanger 2; the heat exchanger 2 is a spiral plate heat exchanger; the crystallizer 3 is a continuous crystallizer; the filter press is a metal mesh filter press machine.

[0036] Sodium vanadate was crystallized using the above crystallization system:

[0037] The 80°C sodium orthovanadate solution stored in the buffer tank 1 is transported to the heat exchanger 2 through the delivery pump. The heat exchanger 2 is a spiral plate heat exchanger, and the cooling medium is demineralized water to cool down the sodium orthovanadate solution After reaching 56°C, transport it to the continuous crystallizer 3; adopt the cooling method...

Embodiment 2

[0039] This embodiment utilizes the crystallization system provided in Example 1 to crystallize sodium vanadate:

[0040] The 85°C sodium metavanadate solution stored in the buffer tank 1 is transported to the heat exchanger 2 through the delivery pump. The heat exchanger 2 is a spiral plate heat exchanger, and the cooling medium is demineralized water to cool down the sodium metavanadate solution After reaching 60°C, transport it to the continuous crystallizer 3; adopt the cooling method of supernatant liquid circulation, control the cooling rate to 5°C / h, cool the solution to 42°C for crystallization, and obtain crystal slurry at the bottom of the crystallizer, after crystallization After feeding at the bottom of the device, the magma enters the thickener 4 to thicken to obtain the thickened magma and supernatant. The solid content in the thickened magma is 27wt%, and the resulting supernatant is stored in the mother liquor tank 7 After the thickened magma is stored in the mag...

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Abstract

The invention relates to a sodium vanadate crystallization system and a sodium vanadate crystallization method. The system comprises a buffer tank, a heat exchange tank, a crystallizer, a thickener, a crystal slurry storage tank, a filter press and a mother solution tank which are sequentially arranged, wherein the mother solution tank is connected with a supernate discharging hole of the thickener. According to the system, a sodium vanadate solution stored in the buffer tank is conveyed into the heat exchanger, is cooled and is conveyed into the crystallizer to be crystallized and separated, crystal slurry at the bottom of the crystallizer is conveyed into the thickener to be thickened, supernate is stored into the mother solution tank, the thickened crystal slurry is conveyed into the crystal slurry storage tank and is separated into sodium vanadate crystals and separation liquid by virtue of the filter press, and meanwhile, the separation liquid is stored into the mother solution tank. According to the method, the particle size and moisture of the sodium vanadate crystals can be effectively controlled, the problem of blockage of the sodium vanadate crystals is solved, the efficiency of the crystallization system is improved, the crystallization control of the sodium vanadate solution is realized under a high-alkali condition, and the stable and efficient operation of the crystallization system are guaranteed; and the method has good application prospects.

Description

technical field [0001] The invention relates to the field of vanadium chemical industry, in particular to a sodium vanadate crystallization system and a sodium vanadate crystallization method. Background technique [0002] At present, the vanadium chemical industry at home and abroad mostly adopts the traditional pyro-method vanadium slag sodium roasting process to extract vanadium. The basic principle is that Na 2 CO 3 As an additive, low-valence vanadium is converted into water-soluble sodium salt of pentavalent vanadium through high-temperature sodium roasting (750-850 ° C), and then the sodium roasted product is directly immersed in water to obtain a leaching solution containing sodium metavanadate Liquid, and then add ammonium salt to produce ammonium polyvanadate precipitation, and obtain vanadium oxide products after reduction roasting. However, this method has problems such as serious environmental load and low extraction efficiency, and is no longer suitable for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/02C01G31/00
CPCB01D9/0059B01D9/0013B01D9/0063C01G31/00C01P2002/60C01P2006/82
Inventor 王新东李兰杰高明磊杜浩郑诗礼白瑞国柳朝阳
Owner HEBEI IRON AND STEEL
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