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Method for acid hydrolysis, oxidation, conversion and leaching of vanadium after stone coal decarburization

An acid hydrolysis oxidation and stone coal technology is applied in the field of vanadium refining, which can solve the problems of long acid leaching stirring time, low ore adaptability, and high filtration difficulty, and achieve the effects of improving grade, reducing environmental pollution and reducing production costs.

Inactive Publication Date: 2010-01-20
谢桂文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Chinese Patent No. 200610011042.0 discloses a method for oxidizing, transforming and leaching vanadium from stone coal under a pressure field: adding stone coal, oxidant and 50-98% industrial sulfuric acid into the autoclave, controlling the conversion temperature to 100-300 Under the conditions of ℃, pressure 1.0MPa, acid leaching for 10 minutes to 240 minutes, directly transform the vanadium in the stone coal into the solution, although the leaching index of vanadium can be as high as 95%, but the equipment requirements are high, the investment is large, and the energy consumption is high
Chinese patent No. 90104669.8 discloses a method for extracting vanadium pentoxide by sulfuric acid heating and slaking of stone coal ash slag. The vanadium leaching rate is 68%. out, serious environmental pollution, and low leaching rate and other disadvantages
In the prior art, there is also a vanadium extraction process by heterogeneous acid leaching. The vanadium leaching rate is 78% after continuous stirring and leaching for 20 hours. This method has the disadvantages of high energy consumption and low adaptability to different types of ores.
[0008] Moreover, the existing acid leaching process requires that the stone coal powder be ground to a very fine particle size, so after leaching, the filtration is difficult and the efficiency is low. In addition, the acid leaching stirring time is long, so the energy consumption is high, the production efficiency is low, and the production cost is high. high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) dry-grinding the primary stone coal ore containing 0.98% vanadium into stone coal powder with a particle size of about 4mm; (2) burning and decarburizing in a fluidized bed furnace, and the vanadium-containing mass percentage of the stone coal after decarburization is 1.12% (3) according to mass ratio stone coal powder: industrial sulfuric acid: water=100: 20: 12 add the industrial sulfuric acid and water that mass percent concentration is 98%, stir, under normal temperature and pressure, wet pile 8 days, pile height About 4 meters; (4) add water according to the ratio of solid-liquid weight ratio of 1:1, and add oxidant hydrogen peroxide equivalent to 0.2wt% of the weight of stone coal powder, heat to 65 ° C, stir and leaching for 60 minutes, adjust the pH value to 2.5, filter to remove slag, and obtain blue vanadyl sulfate solution. Vanadium leaching rate is 91.3%.

Embodiment 2

[0025] (1) dry-grinding the stone coal primary ore of 0.98% vanadium-containing mass percentage into stone coal powder with a particle diameter of about 3mm; (2) the same as embodiment 1 step (2); (3) according to the mass ratio of stone coal powder: Industrial sulfuric acid: the ratio of water=100: 15: 10 is added the industrial sulfuric acid and the water that mass percent concentration is 98%, stirs, and under normal temperature and pressure, wet heap 10 days, heap height is about 3 meters; (4) according to solid Add water at a liquid weight ratio of 1:1.5, and add 0.3% oxidant sodium chlorate equivalent to the weight of stone coal powder, heat to 60°C, stir and leach for 50 minutes, adjust the pH value to 2.1, filter to remove slag, and obtain Blue vanadyl sulfate solution. Vanadium leaching rate is 80.5%.

Embodiment 3

[0027] (1) dry-grinding the stone coal primary ore of 0.98% vanadium-containing mass percentage into stone coal powder with a particle diameter of about 2mm; (2) the same as embodiment 1 step (2); : industrial sulfuric acid: water=100: 18: 9 ratio adding mass percentage concentration is the industrial sulfuric acid of 98% and water, stirs, and under normal temperature and pressure, wet heap 7 days, heap height about 5 meters; (4) according to Add water at a solid-liquid weight ratio of 1:1.6, add 0.4% oxidant sodium chlorate equivalent to the weight of stone coal powder, heat to 66°C, stir and leach for 75 minutes, adjust the pH value to 2.6, filter to remove slag, and obtain Blue vanadyl sulfate solution. Vanadium leaching rate is 89.7%.

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Abstract

The invention provides a method of leaching vanadium by acid hydrolyzing, oxidizing and converting after stone coal decarburization. The method comprises steps of (1) dry-grinding bone coal into bone coal powder with a diameter of 1-5mm; (2) burning the bone coal powder in a fluidized bed furnace for decarburization; (3) adding sulfuric acid and water with a mass ratio of bone coal powder :sulfuric acid :water of 100:12-22:8-20, stirring uniformly, wet-stacking under the normal temperature and pressure, and the sulfuric acid has a weight percentage concentration of 98%; (4) adding water according to a solid-liquid weight ratio of 1:0.8-2 under a temperature of 60-70 DEG C and the normal pressure, adding oxydant with 0.1-0.5wt% of the bone coal powder, stirring and leaching for 30-120 minutes, adjusting the PH value to 2-3, and filtering the obtained for deslagging.The invention has characteristics of low equipment investment, low energy-consumption, high coefficient of metal recovery high production efficiency, low producing cost and small environmental pollution.

Description

technical field [0001] The invention relates to a method for extracting vanadium from stone coal, in particular to a method for extracting vanadium by wet stack oxidation conversion of stone coal and sulfuric acid under normal temperature and pressure. Background technique [0002] Vanadium can improve the strength, toughness, ductility and heat resistance of steel. Metal vanadium can also be used in magnetic materials, cast iron, hard alloys, superconducting materials and nuclear reactor materials. Vanadium pentoxide and other vanadium compounds are mainly used in Colorants in the glass and ceramic industry, sulfuric acid and catalysts for petrochemical production. With the rapid development of metallurgy and chemical industry, the application range of vanadium is getting wider and wider. [0003] Vanadium is mainly derived from vanadium-containing magnetite and stone coal. my country V 2 o 5 The total storage capacity reaches 135330Kt, while the vanadium reserve in sto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B1/02C22B34/22
CPCY02P10/20
Inventor 谢桂文
Owner 谢桂文