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A method for extracting vanadium pentoxide from stone coal vanadium ore mixed with acid heap ore
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A technology of vanadium pentoxide and stone coal vanadium, which is applied in the field of extraction of vanadium pentoxide, and can solve problems such as poor technical indicators
Active Publication Date: 2015-12-09
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[0004] my country is rich in stone coal resources, especially in Hunan Province where the stone coal resources are very concentrated. After recent years of process research, the process of extracting vanadium from stone coal has become increasingly mature, and various new process routes have been put into industrial production, but the general technical indicators are poor. A kind of technological process is simple, and recovery rate is high, and the extraction method of vanadium pentoxide high in product purity after recovery has great significance
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Embodiment 1
[0054] The raw ore composition of vanadium-bearing stone coal is V 2 o 5 1.4%, K + 0.66%, Fe 总 1.04%, Al 2 o 3 3.75%, Si 2 O81%, C8.75%, and the balance is impurities. Its bulk density is 0.95g / cm 3 , the true density is 1.12g / cm 3 .
[0055] The raw ore is processed with a jaw crusher, and the particle size of the raw ore after processing is up to 5mm. Take 500kg and add 100kg of sulfuric acid with a mass concentration of 93% and 50L of tap water to mix evenly with a concrete mixer, then store the mixture on the thermal insulation material, cover the thermal insulation material in the pile, and store it for 80 hours.
[0056] The stockpiled ore is crushed manually to ensure that the maximum particle size of the ore is less than 10cm. Take 200kg of mixed ore and add 200L of water, mechanically stir in the leaching tank for 1.0h, and filter the output filtrate to 152.5L, containing 11.5g / L of vanadium pentoxide, vanadium The leaching rate was 89.5%.
[0057] The leac...
Embodiment 2
[0062] The raw ore composition of vanadium-bearing stone coal is V 2 o 5 1.9%, K + 0.65%, Fe 总 1.02%, Al 2 o 3 3.7%, Si 2 O81%, C8.8%, and the rest are impurities. Its bulk density is 0.97g / cm 3 , the true density is 1.12g / cm 3 .
[0063] The raw ore is processed with a jaw crusher, the particle size of the raw ore is less than 5mm, and then ball milled, and the slag with a particle size of ore powder less than 0.074mm is 45%. Take 400kg and add 800kg of sulfuric acid with a mass concentration of 95% and 40L of tap water to mix evenly with a concrete mixer, and then store the mixture on the thermal insulation material.
[0064] The stockpile ore is broken manually to ensure that the maximum particle size of the ore is less than 10cm. Take 200kg of mixed ore and add 200L of leaching slag washing water, mechanically stir in the leaching tank for 1.0h, and filter the output filtrate 153.8L, containing 12.5g / L, vanadium leaching rate is 91.5%.
[0065] The leaching sol...
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Abstract
The invention discloses a method of extracting vanadium pentoxide from stone coal vanadium ore acid-mixed pile ore. The method comprises the following steps: crushing and coarsely crushing the vanadium-containing stone coal vanadium ore till the granularity is less than 5mm; adding acid and water into the crushed ore and uniformly mixing and piling; leaching piled ores by clean water in normal temperature; filtering pulp to generate a leaching liquid and leaching residues; pulpifying and washing the leaching residues as a building material for producing cement or bricks; extracting the leaching liquid which is neutralized by lime and sodium carbonate by an extractant; reversely extracting by sulfuric acid; and oxidizing the strip liquor by hydrogen peroxide, neutralizing by ammonium water and depositing vanadium in acidity to generate red vanadium and then calcining to generate vanadium pentoxide. The vanadium leaching efficiency is greatly improved to over 90%, and the total recovery rate reaches up to over 85%.
Description
technical field [0001] The invention belongs to a method for extracting vanadium pentoxide, in particular to a method for extracting vanadium pentoxide from stone coal vanadium ore mixed with acid heap ore. Background technique [0002] Hunan Province is rich in stone coal resources, especially in western Hunan. With the advancement of stone coal vanadium extraction technology, some new technologies have been put into industrial production. However, most of the process technical indicators are poor and the adaptability is not high. The conversion rate of vanadium is generally 60-80%, the recovery rate is 55-75%, and the product is mainly 98 vanadium. [0003] The raw material for vanadium extraction in this process is vanadium ore in Liangshuijing area, Yuanling County, Hunan Province. The vanadium ore has large reserves, high grade and low impurity content, and can be mined in open pit. V 2 o 5 The content of the products is greater than or equal to 1.4%, and the highest...
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