Method for extracting vanadium by calcining vanadium-containing stone coal powder in calciner and pickling

The technology of vanadium-containing stone coal acid and roasting furnace is applied in the field of vanadium extraction from stone coal, which can solve the problems of insufficient comprehensive utilization of stone coal heat, large workload of workers, prolonged technological process, etc., so as to avoid energy consumption, The effect of high leaching rate and shortened production process

Inactive Publication Date: 2011-10-12
北京华夏建龙矿业科技有限公司
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  • Abstract
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Problems solved by technology

my country's technical research on extracting vanadium from stone coal has begun in the 1970s, mainly adopting flat kiln roasting and water immersion technology, and the extraction rate of vanadium is about 50%. Disadvantages of continuous, heavy worker workload
[0003] Due to the disadvantages of roasting stone coal in flat kilns, some enterprises curr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1:

[0023] (1) 2 tons of stone coal, the particle size distribution after crushing and ball milling is 0.7% above 60 mesh, 7.2% 60-120 mesh, 44.3% 120-200 mesh, 47.7% below 200 mesh, and the moisture content is 0.7 %, 0.98% vanadium, 10.15% carbon, evenly added after the roaster is ignited, the bottom wind pressure of the roaster is 4600pa, and the temperature in the furnace is controlled at 860-890℃.

[0024] (2) Obtain 860-890℃ roasting material, slag grade 1.08%, leaching with 25% sulfuric acid solution with mass concentration and 3% leaching aid, liquid-solid ratio 1.5:1, leaching temperature 95℃, leaching time 4 Hours, the leaching rate of vanadium was 85.7%.

[0025] The pH value of the leaching solution is adjusted to 2-2.5, and 15% P204 (diisooctyl phosphate) + 5% TBP (tributyl phosphate) + 80% kerosene (volume percentage) is used as the organic phase, compared by volume: organic phase: Aqueous phase=1:1.5, the organic phase containing vanadium is obtained b...

Example Embodiment

[0026] Example 2:

[0027] (1) The particle size distribution of stone coal after crushing and ball milling is 0.7% on 60 mesh sieve, 7.2% on 60-120 mesh, 44.3% on 120-200 mesh, 47.7% under 200 mesh, of which moisture content is 0.7%. It contains 0.98% vanadium and 10.15% carbon. It is added evenly after the roaster is ignited. The bottom wind pressure of the roaster is 4300pa, and the temperature in the furnace is controlled at 890-920℃.

[0028] (2) Obtain 890-920℃ roasting material, slag grade 0.97%, leaching with 25% sulfuric acid solution by mass concentration plus 3% leaching aid, liquid-solid ratio 1.5:1, leaching temperature 95℃, leaching time 6 Hours, the leaching rate of vanadium was 87.8%. The remaining steps are the same as in Example 1.

Example Embodiment

[0029] Example 3:

[0030] (1) The particle size distribution of stone coal after crushing and ball milling is 0.7% on 60 mesh sieve, 7.2% on 60-120 mesh, 44.3% on 120-200 mesh, and 47.7% under 200 mesh. The moisture content is 0.7%. Vanadium 0.98%, carbon content 10.15%, uniformly added after the roaster is ignited, the bottom wind pressure of the roaster is 5300pa, and the temperature in the furnace is controlled at 920-950℃.

[0031] (2) Obtain 920-950℃ roasting material, slag grade 1.04%, leaching with 25% sulfuric acid solution and 3% leaching aid, liquid-solid ratio 1.2:1, leaching temperature 95℃, leaching time 2 Hours, the leaching rate of vanadium obtained is 86%. The remaining steps are the same as in Example 1.

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Abstract

The invention discloses a method for extracting vanadium by calcining vanadium-containing stone coal powder in a calciner and pickling, which comprises the following steps: 1) crushing stone coal, of which the calorific capacity is 800 kilocalories, into 60-mesh undersize which accounts for 85% or above; 2) uniformly feeding the stone coal obtained in the step 1) into a calciner, calcining at 800-1000 DEG C under a bottom wind pressure of 3000-6000pa, and mixing collected fine dust and cinder at an overflow port; 3) leaching the product collected in the step 2) with 20-25% (mass concentration) sulphuric acid, wherein the liquid-to-solid ratio is (1-1.5):1, the leaching temperature is 80-95 degrees, and the leaching time is 2-6 hours; and 4) after the leaching process is finished, carrying out solid-liquid separation to extract vanadium from the leach solution. According to the invention, the carbon content of stone coal can be effectively utilized; the secondary calcination process required for stone coal having high carbon content, including decarburization and oxidative calcination steps, is avoided; and the energy consumption in the secondary oxidative calcination process is avoided, thereby realizing the effective utilization of energy in stone coal.

Description

technical field [0001] The invention belongs to the field of pyrometallurgy, and in particular relates to a method for extracting vanadium from stone coal by roasting powdered stone coal in a roasting furnace and simultaneously completing the combustion of carbon in the stone coal and the oxidative roasting of vanadium in the stone coal. Background technique [0002] Stone coal is widely distributed in the central and southern regions of my country. In addition to carbon, stone coal also contains a certain amount of vanadium and other valuable elements. According to statistics, the vanadium content in my country's stone coal is about 7 times that in my country's vanadium-titanium magnetite, which is a rich vanadium-containing resource. my country's technical research on extracting vanadium from stone coal has begun in the 1970s, mainly adopting flat kiln roasting and water immersion technology, and the extraction rate of vanadium is about 50%. Continuous, the shortcomings of...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B1/02C22B3/08C22B3/40
CPCY02P10/20
Inventor 苑占永白凤仁杨欢窦爱国康复强张永强王玉超谭旺孙凯
Owner 北京华夏建龙矿业科技有限公司
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