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Bacterial leaching way of vanadium in high-sulfur vanadium stone-like coal

A vanadium stone, high-sulfur technology, applied in the direction of improving process efficiency, can solve problems such as environmental pollution, achieve environmental friendliness, avoid the use of a large amount of sulfuric acid, and achieve the effects of small investment

Inactive Publication Date: 2011-09-28
浙江豪美钒业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the sulfur content in stone coal is high, if it is processed by traditional roasting method, a large amount of SO will be produced 2 gas, causing environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1 Get 100Kg of vanadium-containing stone coal ore from a certain stone coal mine in Changshan County, Zhejiang Province, and measure its V 2 o 5 The sulfur content is 0.89%, and the sulfur content is 3.40%. After crushing the stone coal ore, add 40L of water, wet grind the ore until the particle size is less than 0.10mm, place the pulp in a plastic container, add 250L of leaching agent, and carry out leaching at room temperature (15-25°C). During the leaching period, add leaching agent 0.5 L. The leaching agent is composed of: ammonium sulfate 4.0g / L, dipotassium hydrogen phosphate 0.4g / L, magnesium sulfate 0.2g / L, pH=2.0, Acidithiobacillus thiooxidans 10 6 individual / mL. On the first day of leaching, add a small amount of sulfuric acid from time to time to keep the pH of the pulp at 2.0-2.5. After leaching for 21d, V 2 o 5 The leaching rate was 41.6%. After leaching for 49d, V 2 o 5 The leaching rate was 68.5%.

Embodiment 2

[0012] Example 2 Get 100Kg of vanadium-containing stone coal ore from a certain stone coal mine in Changshan County, Zhejiang Province, and measure its V 2 o 5 The grade is 1.34% and the sulfur content is 2.70%. After crushing the stone coal ore, add 40L of water, wet grind the ore until the particle size is less than 0.10mm, place the pulp in a plastic container, add 250L of leaching agent, and carry out leaching at room temperature (15-25°C). During the leaching period, add leaching agent 0.5 L. The composition of the leaching agent is: ammonium sulfate 4.0g / L, dipotassium hydrogen phosphate 0.4g / L, magnesium sulfate 0.2g / L, pH=2.0, acidophilus Thiobacillus thiooxidans 10 6 individual / mL. On the first day of leaching, add a small amount of sulfuric acid from time to time to keep the pH of the pulp at 2.0-2.5. After leaching for 21d, V 2 o 5 The leaching rate was 38.5%. After leaching for 49d, V 2 o 5 The leaching rate was 69.8%.

Embodiment 3

[0013] Example 3 Get 100Kg of vanadium-containing stone coal ore from a certain stone coal mine in Yiyang City, Hunan Province, and measure its V 2 o 5 The grade is 1.01% and the sulfur content is 0.7%. The stone coal ore is crushed and ground to a particle size of less than 0.10mm, and 10Kg of pyrite (with a sulfur content of 35.3%) with a particle size of less than 0.074mm is added to make the sulfur content in the mixed ore greater than 2.5% (S ≥ 2.5%). Put the ore in a plastic container, add 40L of water, add 300L of leaching agent, and carry out leaching at room temperature (15-25°C), and replenish 0.25L of leaching agent every day during the leaching period. The composition of the leaching agent is: ammonium sulfate 4.0g / L, dipotassium hydrogen phosphate 0.4g / L, magnesium sulfate 0.2g / L, pH=1.5, acidophilus Thiobacillus thiooxidans 10 8 individual / mL. On the first day of leaching, add a small amount of sulfuric acid from time to time to keep the pH of the pulp at 1.5-...

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Abstract

The invention discloses a novel bacterial leaching way of vanadium in high-sulfur vanadium stone-like coal, mainly utilizing the characteristic that acidithiobacillus thiooxidans generates sour, and the vanadium of the stone-like coal mineral is leached out. The stone-like coal mineral is crushed and grinded until granularity is less than 0.10mm, and then the stone-like coal mineral is mixed withleaching agent containing with acidithiobacillus thiooxidans for finishing the leaching process under room temperature (15-25 DEG C). After a period for leaching, leaching agent with vanadium is gotten. The invention has the following beneficial effects that 1, the invention is a biological metallurgy way and belongs to the cleaning productive technology; 2, the invention has simple operation and small investment; 3, the characteristic that the acidithiobacillus thiooxidans generates sour is utilized, thus avoiding using a lot of vitriol.

Description

technical field [0001] The invention relates to a method for bacterial leaching of vanadium in high-sulfur vanadium-containing stone coal Background technique [0002] Vanadium-bearing stone coal mines are the main vanadium-containing resources mined as a single vanadium deposit in my country. my country began to study the extraction of vanadium from stone coal in the 1960s, and industrial production began in the 1970s. The processes used are sodium roasting (NaCl)-water leaching or acid leaching. There are two serious defects in this process, one is because the roasting process generates Cl 2 , HCl, SO 2 The mixed gas causes environmental pollution, and the second is that the vanadium recovery rate is generally 45 to 55%, so that about 50% of the vanadium ore resources cannot be effectively utilized and are wasted. In order to change and replace the sodium roasting process, scientific and technological workers have carried out research on new processes such as calcium ro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/22C22B3/18
CPCY02P10/20
Inventor 田学达张小云胡毓前
Owner 浙江豪美钒业有限公司
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