System and method for producing high-purity vanadium pentoxide through clean chlorination of vanadium resources

A technology of vanadium pentoxide and resources, which is applied in the field of clean chlorination of vanadium resources to produce high-purity vanadium pentoxide, which can solve the problems of ecological environment impact, cost increase, and environmental problems.

Active Publication Date: 2019-06-04
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

The process mainly has the following outstanding problems: (1) lengthy process, high energy consumption and high production cost; (2) low vanadium recovery rate, less than 80% from vanadium slag to vanadium oxide products; (3) vanadium extraction residue Difficult to deal with, sodium roasting introduces a large amount of sodium salt, which limits the residue directly returning to the blast furnace for ironmaking; (4) environmental problems are prominent, and the process of leaching and vanadium precipitation produces a large amount of ammonia nitrogen wastewater containing various harmful metal ions and sodium sulfate. Serious impact on the ecological environment
However, the vanadium slag in this process directly enters the chlorination furnace without pretreatment, which will reduce the selectivity of vanadium chlorination, convert a large number of harmful elements into chlorides, and greatly increase the cost of subsequent distillation purification and chlorination residue treatment
The chlorination flue gas volatilized from the chlorination furnace is directly exchanged for heat without dust removal treatment, which will cause pipeline blockage and seriously affect production
The gas phase hydrolysis process will produce a large amount of vanadium-containing hydrochloric acid, which will increase the cost of environmental protection
Moreover, the heat balance of the chlorination furnace, the sensible heat of the high-temperature chlorination flue gas and the chlorination residue are not well utilized.
[0005] In summary, the main outstanding problems in the existing vanadium extraction technology by chlorination incl

Method used

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  • System and method for producing high-purity vanadium pentoxide through clean chlorination of vanadium resources
  • System and method for producing high-purity vanadium pentoxide through clean chlorination of vanadium resources

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Embodiment 1

[0077] combine figure 1 A system for producing high-purity vanadium pentoxide by clean chlorination of vanadium resources used in this embodiment includes a material preparation section 1, a mixing section 2, a chlorination and dust collection section 3, a leaching and sedimentation section 4, and a refining section 5 , milling section 6, waste heat utilization section 7 and residue treatment section 8;

[0078] Material preparation section 1 includes vanadium resource silo 1-1, vanadium resource screw feeder 1-2, disc granulator 1-3, oxidation roasting rotary kiln 1-4, double roller machine 1-5, coarse grain screening machine 1-6 and fine particle screening machine 1-7;

[0079] Mixing section 2 includes screening vanadium resource bin 2-1, screening vanadium resource feeder 2-2, carbon source bin 2-3, carbon source feeder 2-4 and fluidized bed mixer 2 -5;

[0080] Chlorination dust collection section 3 includes chlorination furnace 3-1, chlorination furnace heat exchanger...

Embodiment 2

[0095] Adopt the system described in embodiment 1, present embodiment provides a kind of method for producing high-purity vanadium pentoxide, comprises the following steps:

[0096] The vanadium resources in the vanadium resource silo 1-1 enter the disc granulator 1-3 through the vanadium resource screw feeder 1-2 for granulation treatment; the vanadium resources after granulation treatment are sequentially oxidized and roasted in the rotary kiln 1- 4 Ore phase reforming, crushing by roller machine 1-5, screening by coarse screening machine 1-6 and fine screening machine 1-7, and then entering into screening vanadium resource bin 2-1; the oxidation roasting rotary kiln 1 -4 The operating temperature is 400°C to 1000°C; the vanadium resources in the vanadium resource silo 2-1 and the carbon source in the carbon source silo 2-3 are screened through the vanadium resource feeder 2-2 and the carbon source respectively. The source feeder 2-4 enters the fluidized bed mixer 2-5 at the...

Embodiment 3

[0101] In this example, vanadium slag is used as raw material, and the processing capacity is 200kg / h. High-purity vanadium pentoxide product is prepared through processes such as material preparation, material mixing, chlorination and dust collection, leaching and sedimentation, refining, and milling. Utilization and residue treatment to realize industrial waste energy utilization and residue dechlorination treatment.

[0102] In the oxidative roasting rotary kiln 1-4, the oxidative roasting temperature is 400°C; in the fluidized bed mixer 2-5, the dosage of activated carbon is 25% of the mass of the sieved vanadium slag; The chlorination temperature is 950°C, the operating gas velocity of the chlorination furnace is 4.00m / s, and pure chlorine gas is used as the chlorination medium; in the pulverizing reactor, the water vapor introduced into the catalytic oxidation process is 0.05% of the mass of vanadyl trichloride, Reaction temperature is 120 ℃, and the mass fraction of oxy...

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Abstract

The present invention discloses a system and a method for producing high-purity vanadium pentoxide through clean chlorination of vanadium resources. According to the present invention, vanadium resources are subjected to granulation, oxidation, crushing, screening and other pretreatment processes, the pre-treated vanadium resources enter a chlorination furnace and are selectively chlorinated, thevanadium in the vanadium resources is converted into gaseous vanadium oxytrichloride, and most of impurities such as iron, chromium, calcium, phosphorus, manganese, titanium, silicon and the like in the vanadium resources are retained in the chlorinated residue so as to achieve the effective separation of vanadium and other impurities; the gaseous vanadium oxytrichloride is sequentially subjectedto dust removal, leaching, settlement, rectification purification, catalytic oxidation and other processes to prepare the high-purity vanadium pentoxide; the chlorinated residue is sequentially subjected to waste heat recovery, water washing dechlorination, settlement separation, filtering washing and other processes to obtain filter residue and a washing liquid, the filter residue returns to ironsmelting, and the washing liquid is subjected to evaporation crystallization to obtain a chlorine salt; and with the system and the method, the clean comprehensive utilization of vanadium resources is achieved while the sensible heat of the high temperature flue gas of the chlorination furnace and the high temperature chlorination residue is effectively utilized so as to achieve purposes of energy saving and consumption reduction.

Description

technical field [0001] The invention belongs to the fields of metallurgy and chemical industry, and in particular relates to a system and method for producing high-purity vanadium pentoxide by clean chlorination of vanadium resources. Background technique [0002] Vanadium pentoxide is an important metallurgical chemical material, which has been mainly used as an additive to iron-based alloys to produce alloy steel. In recent years, with the rapid development of industrial technology, the application proportion of vanadium pentoxide in aerospace alloys, energy storage materials, petrochemical catalysts and other fields has gradually increased. In particular, the rapid development of energy storage materials (all-vanadium redox flow battery electrolyte, lithium vanadate cathode material) and high-performance aerospace alloys (vanadium-aluminum series, vanadium-titanium alloy) industry has produced high-quality and high-purity vanadium pentoxide. Huge demand. [0003] Vanadi...

Claims

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Application Information

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IPC IPC(8): C01G31/02
CPCY02P20/10Y02P20/129
Inventor 朱庆山杨海涛范川林
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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