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Method for roasting vanadium-containing stone coal by rotary hearth furnace

A rotary hearth furnace and roasting technology, which is applied in the field of roasting vanadium-containing stone coal in a rotary hearth furnace, can solve the problems of low conversion rate, low clinker leaching rate, and low equipment output, and achieve high conversion rate, uniform roasting, and leaching high rate effect

Active Publication Date: 2013-06-05
SHENWU TECH GRP CO LTD
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AI Technical Summary

Problems solved by technology

In the production process of vanadium extraction from stone coal, the use of flat kiln roasting is dominant, with high energy consumption, high labor intensity, low conversion rate and low output
In recent years, the rotary kiln has gradually replaced the flat kiln, the production scale has been expanded, and the degree of mechanization has been improved. However, there are problems such as low clinker leaching rate due to too short high temperature zone, large randomness of clinker leaching rate due to uneven roasting, and discharge due to ball collision and crushing. Disadvantages such as large amount of dust
In addition, the output of a single piece of rotary kiln equipment is still low, and it is difficult to increase

Method used

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  • Method for roasting vanadium-containing stone coal by rotary hearth furnace

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Effect test

specific Embodiment 1

[0032] Stone coal raw ore in a certain place, containing 15% carbon and containing V 2 o 5 1.2%, mix, crush, and finely grind raw stone coal ore and additives, stir and mix evenly according to the ratio of raw ore: additive: binder = 72: 18: 10 by weight, and then use a molding machine to make raw meal balls with a diameter of 20 mm. and dry. The dried raw material balls are distributed into the rotary hearth furnace, and the thickness of the material layer is 40mm. The furnace temperature in the effective roasting area is 800±10°C, and the oxygen content is 15%. The raw meal balls stay in the effective roasting area for 3 hours, and the clinker after being released from the furnace is cooled, broken, and stirred and impregnated in 5% dilute sulfuric acid at room temperature for 6 hours, and the leaching rate is 70%.

specific Embodiment 2

[0033] After the stone coal in a certain place is pre-decarbonized by combustion at 900 °C, the carbon content of 1% and the V content are obtained. 2 o 5 1.3% ash, mix the ash and additives, crush, finely grind, stir and mix evenly according to the ratio of ash by weight: additive: binder=74:15:11, and then use a molding machine to make a raw material with a diameter of 20mm. pellets and dry them. The dried raw material balls are distributed into the rotary hearth furnace, and the thickness of the material layer is 40mm. The furnace temperature in the effective roasting area is 840±10°C, and the oxygen content is 9%. The residence time of the raw meal balls in the effective roasting area is 2.5 hours. The clinker after being released from the furnace is cooled, crushed, stirred and impregnated in 5% dilute sulfuric acid at room temperature for 6 hours, and the leaching rate is 72%.

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Abstract

The invention discloses a method for roasting vanadium-containing stone coal by a rotary hearth furnace, comprising the following steps of: mixing stone coal raw ore or pre-decarburized stone coal ash with additives, breaking and finely grinding; then adding a binding agent and mixing evenly for pelletizing; drying the fresh pellets, spreading the fresh pellets into the rotary hearth furnace by acharging device; performing oxidizing roasting along with rotation of the furnace hearth; discharging from the furnace body by a discharging device; and cooling to obtain clinker used for V2O5 leaching. The process disclosed by the invention has simplicity and wide applicability; and because the rotary hearth furnace is adopted for roasting, the roasting temperature, gas atmosphere and time can be effectively controlled, the degree of automation is high, dust emission is low, and the yield of unit equipment is high.

Description

technical field [0001] The invention relates to a method for roasting vanadium-containing stone coal by using a rotary hearth furnace. Background technique [0002] Vanadium is a rare metal with a high melting point and has many excellent properties. It is an important industrial raw material and is widely used in metallurgy, chemical industry, national defense and other fields. [0003] Vanadium ore resources are generally scattered and of low grade, mainly including vanadium-titanium magnetite and stone coal vanadium ore. Vanadium in stone coal vanadium ore mainly exists in low-valence state, especially in trivalent vanadium compound which is insoluble in both acid and alkali. [0004] At present, the method of extracting vanadium from stone coal mostly adopts the method of roasting of raw ore (or ash after pre-decarburization)-leaching-purification of vanadium liquid-precipitation of vanadium and calcination. Roasting is a key process in the process of vanadium extracti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/22C22B1/02
Inventor 吴道洪李志远
Owner SHENWU TECH GRP CO LTD
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