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Method used for preparing ammonium metavanadate from vanadium slag via ammonium salt leaching

A technology of ammonium metavanadate and vanadium slag ammonium salt, which is applied in the field of non-ferrous metallurgy, can solve the problems of large amount of vanadium precipitation wastewater and Glauber's salt by-products, low purity of sodium vanadate products, and difficulty in acid wastewater treatment. The effect of simplifying the wastewater treatment process, low cost and short process

Active Publication Date: 2014-07-30
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

Such as CN101412540A discloses a kind of technology of extracting vanadium by acid leaching, vanadium slag is leached with strong acid, extracts and enriches vanadium, back extraction obtains high-concentration vanadium solution, but various metal impurities are many in the acid leaching solution, acid waste water treatment is difficult and other shortcomings
Strong alkali leaching is generally under high temperature and high pressure conditions, such as CN102127655A, CN102127655A, wherein, the alkali can be recycled, evaporated and crystallized to obtain sodium orthovanadate products, however, the main problem of strong alkali leaching is the high content of impurities such as silicon and aluminum, The purity of sodium vanadate product is not high, and sodium orthovanadate is only an intermediate product
Although the wet vanadium extraction process avoids the high-temperature roasting process, there are still problems such as a large amount of vanadium precipitation wastewater and by-products of Glauber's salt.

Method used

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  • Method used for preparing ammonium metavanadate from vanadium slag via ammonium salt leaching

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Crushing and grinding the vanadium slag to a particle size of less than 74 microns, pre-oxidizing at 800°C for 120 minutes, and opening the furnace door ajar during the roasting process to ensure that the vanadium slag is fully in contact with the air;

[0041](2) Take 40g of pre-oxidized vanadium slag, add it to 300g / L ammonium bicarbonate solution, and mix evenly. Among them, the ammonium bicarbonate solution has a volume of 200mL, and leaching reaction in an autoclave. The reaction is controlled at 150°C, and the reaction time is 3h , the pressure in the autoclave is 3.5MPa; after the reaction, the filter residue is washed twice with countercurrent water. During the washing process, the water consumption for each washing is 200mL, and the water temperature is 29°C;

[0042] (3) Cool the leaching solution obtained by filtration to 62° C. and filter to obtain ammonium metavanadate crystals.

[0043] After testing and calculation, the leaching rate of vanadium is 91...

Embodiment 2

[0045] (1) The vanadium slag is crushed and ground to a particle size of less than 74 microns, and pre-oxidized at 900°C for 60 minutes. During the roasting process, the furnace door is ajar to ensure that the vanadium slag is fully in contact with the air. .

[0046] (2) Take 40g of pre-oxidized vanadium slag, add it to 150g / L ammonium bicarbonate solution, mix well, and the volume of ammonium bicarbonate solution is 200mL, leaching reaction in an autoclave, control the reaction at 200°C, and the reaction time is 6h , the pressure in the autoclave is 4.1MPa. After the reaction, the filter residue is washed twice with countercurrent water. During the washing process, the water consumption for each washing is 200mL, and the water temperature is 34°C;

[0047] (3) Cool the leaching solution obtained by filtration to 51° C. and filter to obtain ammonium metavanadate crystals.

[0048] After testing and calculation, the leaching rate of vanadium is 90.89%, the leaching rate of si...

Embodiment 3

[0050] (1) Crushing and grinding the vanadium slag to a particle size of less than 74 microns, pre-oxidizing at 750°C for 180 minutes, and opening the furnace door ajar during the roasting process to ensure that the vanadium slag is fully in contact with the air;

[0051] (2) Take 40g of pre-oxidized vanadium slag, add it to 150g / L ammonium carbonate solution, and mix evenly. Among them, the ammonium bicarbonate solution has a volume of 200mL, and leaching reaction in an autoclave. The reaction is controlled at 150°C, and the reaction time is 6h. The pressure in the autoclave is 2MPa. After the reaction is completed, the filter residue is washed twice with countercurrent water. During the washing process, the water consumption for each washing is 200mL, and the water temperature is 23°C;

[0052] (3) Cool the leaching solution obtained by filtration to 55° C. and filter to obtain ammonium metavanadate crystals.

[0053] After testing and calculation, the leaching rate of vanad...

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Abstract

The invention discloses a method used for preparing ammonium metavanadate from vanadium slag via ammonium salt leaching. The method comprises following steps: (1) vanadium slag is subjected to pre-oxidation so as to obtain a calcined product; (2) the calcined product is subjected to leaching with an ammonium salt aqueous solution, and liquid-solid separation is carried out; and (3) a liquid obtained via step (2) is subjected to cooling crystallization and separation so as to obtain ammonium metavanadate crystals. The method is high in vanadium leaching efficiency; leaching solution impurity content is low; ammonium metavanadate can be obtained via cooling crystallization; waste water contains no mirabilite; subsequent processes, such as purifying, vanadium precipitation, and waste water treatment, are simplified; technical cost is low; operation is simple; and the method is clean, and no pollution is caused.

Description

technical field [0001] The invention belongs to the field of nonferrous metal metallurgy, in particular to a method for preparing ammonium metavanadate by leaching vanadium slag ammonium salt. Background technique [0002] Vanadium is a non-ferrous metal, the "monosodium glutamate of modern industry" and a very important strategic resource. With its excellent alloy performance and catalytic performance, it is widely used in metallurgy, national defense, chemical industry, machinery, electronics, automobile, railway and light industry, and 85% of vanadium is consumed by the 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, Chengde and Ma'anshan. Vanadium, titanium, chromium, iron and other metals coexist in vanadium-titanium magneti...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B34/22
CPCY02P10/20
Inventor 徐红彬董玉明刘园月张红玲裴丽丽段少勇田颖余开平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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