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A process for the clean production of vanadium oxides by carbon-alkali leaching of vanadium slag and hydrogen reduction

A technology of vanadium oxide and reduction method, which is applied in the field of vanadium oxide production and vanadium slag carbon alkali leaching hydrogen reduction method to cleanly produce vanadium oxide, which can solve the problems of low vanadium leaching rate and lengthy vanadium precipitation process, and achieve vanadium High recovery rate, short process flow, and the effect of shortening the process flow

Active Publication Date: 2018-09-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process has low vanadium leaching rate, lengthy vanadium precipitation process, and involves ammonia nitrogen wastewater treatment and other issues.

Method used

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  • A process for the clean production of vanadium oxides by carbon-alkali leaching of vanadium slag and hydrogen reduction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) The vanadium slag is crushed and ground to a particle size of less than 74 microns, and calcium oxide and vanadium slag are added to mix the ingredients, and the calcium salt and V in the mixture are controlled. 2 o 5 The molar ratio of the vanadium slag is 0.05, and it is oxidized and roasted at 800 ° C for 90 minutes. During the roasting process, the furnace door is ajar to ensure that the vanadium slag is in full contact with the air;

[0053] (2) Get 40g of pre-oxidized vanadium slag, add it to 12% sodium carbonate solution, mix well, wherein the volume of sodium carbonate solution is 200mL, leaching reaction in autoclave, control reaction temperature 100 ℃, reaction time 2h;

[0054] (3) The solution obtained by filtration is concentrated by vacuum evaporation at 70° C., cooled and crystallized at room temperature, filtered to obtain sodium metavanadate crystals and crystallization mother liquor, and the crystallization mother liquor is supplemented with sodium...

Embodiment 2

[0060] (1) The vanadium slag is crushed and ground to a particle size of less than 74 microns, and magnesium oxide, magnesium carbonate and vanadium slag are added to mix the ingredients, and the magnesium salt and V in the mixture are controlled. 2 o 5 The molar ratio of the vanadium slag is 2, and it is oxidized and roasted at 700°C for 150 minutes. During the roasting process, the furnace door is ajar to ensure that the vanadium slag is in full contact with the air;

[0061] (2) Take 40g of pre-oxidized vanadium slag, add it to 10% sodium carbonate solution, mix evenly, wherein the volume of sodium carbonate solution is 200mL, leaching reaction in an autoclave, control the reaction temperature to 120°C, and the reaction time to 3h;

[0062] (3) The solution obtained by filtration is concentrated by vacuum evaporation at 80° C., cooled and crystallized at room temperature, filtered to obtain sodium metavanadate crystals and crystallization mother liquor, and the crystallizat...

Embodiment 3

[0068] (1) The vanadium slag is crushed and ground to a particle size of less than 74 microns, and magnesium carbonate, calcium hydroxide and vanadium slag are added to mix the ingredients, and the magnesium salt and V in the mixture are controlled. 2 o 5 The molar ratio is 2 and the calcium salt and V 2 o 5 The molar ratio is 1.5, and it is oxidized and roasted at 750°C for 120 minutes. During the roasting process, the furnace door is ajar to ensure that the vanadium slag is in full contact with the air;

[0069] (2) Take 40g of pre-oxidized vanadium slag, add it to 15% sodium bicarbonate solution, mix well, wherein the volume of sodium bicarbonate solution is 200mL, leaching reaction in an autoclave, control the reaction temperature to 90°C, and the reaction time to 4h;

[0070] (3) The solution obtained by filtration is concentrated by vacuum evaporation at 70° C., cooled and crystallized at room temperature, filtered to obtain sodium metavanadate crystals and crystalliza...

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Abstract

The invention relates to a clean production technique of vanadium oxide by a vanadium slag carbocholine leaching-hydrogen reduction process. The technique comprises the following steps: (1) mixing and proportioning the vanadium slag and additives, and roasting to obtain a roasted product; (2) leaching the roasted product obtained in the step (1) with a carbocholine water solution, and carrying out liquid-solid separation; (3) evaporating the solution separated in the step (2), cooling to crystallize, and separating to obtain a sodium metavanadate crystal; and (4) drying the sodium metavanadate crystal obtained in the step (3), reducing with hydrogen, and carrying out immersion cleaning for dealkalization, atmosphere roasting, washing for desalting, drying and crushing on the reduction product to obtain the vanadium oxide product. The technique has the advantages of high vanadium recovery rate and low impurity content in the leaching solution. The sodium metavanadate is used for directly preparing the vanadium oxide product, thereby avoiding the treatment of the ammonia nitrogen wastewater. The technique is simple and clean, and has the characteristics of no pollution and the like.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal metallurgy, and in particular relates to a process for producing vanadium oxides, in particular to a process for cleanly producing vanadium oxides by carbon-alkali leaching and hydrogen reduction of vanadium slag. Background technique [0002] Vanadium is a non-ferrous metal, the "monosodium glutamate of modern industry" and a very important strategic resource. Vanadium is widely used in the fields of metallurgy, chemical industry, machinery, electronics, automobile, railway and light industry because of its excellent alloy properties and catalytic properties. 85% of vanadium is consumed by the iron and steel industry. [0003] Vanadium-titanium magnetite is the main mineral of vanadium resources in the world, and 88% of the world's vanadium production is obtained from vanadium-titanium magnetite. my country's vanadium-titanium magnetite resources are abundant, mainly distributed in Panzhihua, Ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B34/22
CPCY02P10/20
Inventor 徐红彬董玉明张红玲刘园月裴丽丽田颖郑川立段少勇余开平张炳烛张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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