A method for calcium and magnesium composite enhanced vanadium extraction

A calcium-magnesium and composite material technology, applied in the metallurgical field, can solve the problems of low recovery rate of vanadium in the vanadium extraction process by calcification, and achieve the effects of reducing the encapsulation effect, improving the conversion rate and improving the leaching kinetic conditions.

Active Publication Date: 2021-03-09
CHONGQING UNIV
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  • Description
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Problems solved by technology

Due to the limitation of kinetics in the roasting stage and the dual limitations of thermodynamics and kinetics in the leaching stage, the recovery rate of vanadium in the calcification vanadium extraction process is low

Method used

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  • A method for calcium and magnesium composite enhanced vanadium extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: see figure 1 , a method for calcium-magnesium composite enhanced vanadium extraction, comprising the steps of:

[0024] S1: Fully mix converter vanadium slag and limestone in a mixer in a certain proportion to obtain a composite material. The particle size of raw materials used is 100% less than 200 microns, and 85% is less than 100 microns; the molar ratio of Ca and V in the mixture is 1:1.

[0025] S2: Oxidize and roast the composite material in step 1: in a rotary kiln, the oxygen partial pressure in the furnace is 0.21atm, the temperature in the high temperature section is 850°C, the residence time in the furnace is 3h, and the calcium-magnesium composite roasted clinker is obtained by air cooling.

[0026] S3: Milling the calcium-magnesium composite roasted clinker in step 2 in a ball mill to obtain a calcium-magnesium composite roasted clinker fine powder, the particle size of which is 70% less than 75 microns.

[0027] S4: leaching the fine powder...

Embodiment 2

[0029] S1: Fully mix converter vanadium slag, limestone, and magnesite powder in a mixer in a certain proportion to obtain a composite material. The particle size of the raw materials used is 100% less than 200 microns, and 85% is less than 100 microns; the molar ratio of (Ca+Mg): V in the mixture is 1:1, and the molar ratio of Mg to Ca is 5:1.

[0030] S2: The composite material in S1 is oxidized and roasted in a rotary kiln, the oxygen partial pressure in the furnace is 0.21atm, the temperature in the high temperature section is 850°C, the residence time in the furnace is 3h, and the calcium-magnesium composite roasted clinker is obtained by air cooling.

[0031] S3: The calcium-magnesium composite roasted clinker in SS2 is ball-milled in a ball mill to obtain calcium-magnesium composite roasted clinker fine powder, the particle size of which is 70% less than 75 microns.

[0032] S4: Leach the calcium-magnesium composite roasted clinker fine powder in S3 in dilute sulfuric a...

Embodiment 3-11

[0034] Example 3-11: The same method as in Example 2 was adopted, the only difference being the amount of materials used in each step and the reaction conditions, as shown in Table 1 for details.

[0035] In addition, the calcination temperature in S2 does not exceed 850°C, specifically 850°C, 800°C, 750°C or 700°C, and the residence time in the furnace is 1~4h, specifically 1h, 1.5h, 2h, 2.5h, 3h , 3.5h or 4h, the oxygen partial pressure in the furnace is 0.15~0.21atm, specifically 0.15atm, 0.16atm, 0.17atm, 0.18atm, 0.19atm, 0.20atm or 0.21atm, the pH value in S4 is 2-4, Specifically, you can choose 2, 3 or 4.

[0036] Table 1

[0037] (Ca+Mg) / V molar ratio Mg / Ca molar ratio Calcination temperature (℃) Furnace residence time (h) Partial pressure of oxygen in the furnace (atm) Leach pH Leaching time (min) Vanadium recovery rate (%) Example 3 1:2 1:1 850 3 0.21 3.0±0.2 30 79.8 Example 4 1:2 2:1 850 3 0.21 3.0±0.2 30 83.3 ...

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Abstract

The invention relates to a method for calcium and magnesium composite enhanced vanadium extraction. In the method, vanadium-containing fine powder, Ca ion additives and Mg ion additives are fully mixed in a mixer to obtain a composite material; and then the composite material is Oxidize and roast at a specified temperature in a high-temperature furnace for a certain period of time, cool to obtain calcium-magnesium composite roasted clinker; then crush the composite roasted clinker to obtain composite roasted clinker fine powder; then use acidic The solution is leached and filtered to obtain a vanadium-containing filtrate. The calcium-magnesium composite strengthening method can not only improve the dynamic conditions of the vanadium slag in the roasting process, improve the roasting conversion rate of the vanadium slag, but also improve the leaching thermodynamic conditions of the roasted clinker, and increase the leaching rate of the roasted clinker.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for calcium-magnesium composite enhanced vanadium extraction. Background technique [0002] Vanadium is known as "the monosodium glutamate of modern industry" and is an important strategic metal resource, which is mainly used in high-tech fields such as steel, chemistry, aerospace, ocean development, ordnance, and nuclear reactors. As an alloy additive, vanadium can significantly improve the strength, toughness, ductility, plasticity, etc. of metal materials. With the implementation of a series of major scientific and technological development plans such as deep space, deep ground, and deep sea in my country, the demand for high-strength and high-quality metal materials is increasing, and the demand for vanadium is also increasing day by day. [0003] Calcification vanadium extraction is a clean vanadium extraction production process. The calcification vanadium extraction pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B34/22
Inventor 向俊一吕学伟裴贵尚王鑫吕炜钟大鹏辛云涛
Owner CHONGQING UNIV
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