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A compound roasting additive for extracting vanadium pentoxide from vanadium-containing stone coal and its application

A vanadium pentoxide and additive technology, which is applied in the compound roasting additive for extracting vanadium pentoxide from vanadium-containing stone coal and its application field, can solve the problems of limited sources, expensive prices of barium and its compounds, and achieve saving The effect of energy consumption, low cost and short roasting time

Inactive Publication Date: 2011-12-28
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite additive barium and its compounds are expensive and the sources are limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The vanadium grade of the vanadium-containing stone coal ore is 0.81%, and a compound roasting additive of 1% of the stone coal mass is added. The mass ratio of sodium fluoroaluminate, calcium fluoride and sodium peroxide in the additive is 35%: 40%: 25%, and the mixture is uniform. Calcined at 700°C for 3h. The roasted slag is leached with sulfuric acid, and the leaching solution is treated according to the existing vanadium extraction process after removing impurities, and finally a qualified vanadium pentoxide product is obtained, with a transfer leaching rate of 91.52% and a total vanadium recovery rate of 86.02%.

Embodiment 2

[0035]Vanadium-containing stone coal ore has a vanadium grade of 0.93%, and a composite roasting additive of 2% of the stone coal mass is added. The additive is a mixture of cryolite (sodium fluoroaluminate), fluorite (calcium fluoride) and potassium peroxide. The quality of the three The ratio is 45%: 40%: 15%, mix evenly, and bake at 800°C for 3h. The roasted slag is leached with sulfuric acid, and the leach solution is treated according to the existing vanadium extraction process after removing impurities, and finally a qualified vanadium pentoxide product is obtained, with a transfer leaching rate of 93.11% and a total vanadium recovery rate of 87.23%.

Embodiment 3

[0037] Vanadium-containing stone coal ore has a vanadium grade of 0.72%, and a compound roasting additive of 4% stone coal mass is added. The additive is a mixture of cryolite (sodium fluoroaluminate), fluorite (calcium fluoride) and calcium peroxide. The quality of the three The ratio is 35%: 45%: 20%, mix evenly, and bake at 850°C for 2h. The roasted slag is leached with sulfuric acid, and the leach solution is treated according to the existing vanadium extraction process after removing impurities, and finally a qualified vanadium pentoxide product is obtained, with a transfer leaching rate of 90.11% and a total vanadium recovery rate of 87.41%.

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Abstract

The invention relates to a composite roasting additive used in the roasting process of vanadium-containing stone coal and application of composite roasting additive. The composite roasting additive comprises the following components in percentage by mass: 35 to 45 percent of sodium fluoaluminate, 40 to 50 percent of calcium fluoride, and 15 to 25 percent of hyperoxide of alkali metal, wherein the hyperoxide of the alkali metal is sodium hyperoxide or potassium hyperoxide or calcium hyperoxide. When the composite roasting additive is used, the adding amount of the composite roasting additive for extracting vanadium pentoxide from the vanadium-containing stone coal is 1 to 6 percent of the mass of the vanadium-containing stone coal, the composite roasting additive and the vanadium-containing stone coal are fully mixed uniformly, the roasting temperature is 700 to 900 DEG C, and the roasting time is 1 to 4 hours. Compared with the prior art, the composite roasting additive has the advantages of (1) low adding amount, (2) low roasting temperature and short roasting time, (3) no smoke pollution, (4) high leaching rate, (5) wide additive component source, and (6) good adaptability.

Description

Technical field [0001] The present invention involves the field of extracting the penta oxidation two -pyrophotia technology, which is specific to the composite roasting additives and applications used in the process of baking of vermiculite coal. Background technique [0002] my country's stone coal resource reserves are abundant and are distributed in more than ten provinces and cities in the south.Extracting 石 metal from stone coal is an important aspect of comprehensive use of stone coal resources, which has important economic and social significance.存 The status of 存 is complicated in the stone coal, with three, four and five prices, which mainly exist in the form of three prices.Three -valent 同 is in the form of aluminum silicate mineral crystal structure in the same form of quality.To immerse this part of the 石 in the stone coal, it is necessary to destroy the illegal mineral crystal structure to release the 钒, and then oxidize it into a vice -vice -priced or five -valent ...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B1/02
Inventor 何东升张泽强张汉泉张翼
Owner WUHAN INSTITUTE OF TECHNOLOGY
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