Bacillus and method for bio-leaching of scandium from scandium-containing minerals by virtue of bacillus

A bacillus and bioleaching technology, which is applied in the field of metallurgical technology of rare metals, can solve problems such as difficulty in impurity removal and separation, impact of purification, and decline in scandium recovery rate, and achieve the effects of simple process, easy promotion, and reduced production costs

Active Publication Date: 2016-08-24
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI +1
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  • Description
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AI Technical Summary

Problems solved by technology

[0004] However, the disadvantage of the above-mentioned similar process is that when scandium is transferred into the leaching solution under high acidity conditions, a large amount of impurities in the raw material are also leached, which has a great impact on the subsequent purification of scandium and causes environmental pollution.
This method has high operating costs. Due to the high leaching rate of impurity elements such as iron and magnesium in the ore, the consumption of sulfuric acid as a leaching agent is very large, generally reaching 800-900 kg of sulfuric acid / ton of ore.
At the same time, the impurity elements such as iron and magnesium in the solution are very high, which brings difficulties to the subsequent impurity removal and separation, and reduces the recovery rate of scandium.
This method has poor economic efficiency and high environmental pollution, and cannot meet the requirements of long-term industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Grind scandium-containing minerals to particles with a particle size of 0.037mm to 0.074mm, put them into nutrient culture solution, sterilize at high temperature, and then inoculate bacteria. The leaching conditions are: the pulp concentration of the leach solution is 1%, and the initial bacterial concentration for inoculation is 1.0×10 8 cells / ml, the concentration of bacteria in the leaching system after inoculation was 1.0×10 7 cells / ml, the pH value of the culture solution is 7.2, the shaking table rotates at 200 rpm, and the temperature is 30°C. When scandium-containing minerals are in the aseptic system, the scandium leaching rate is almost zero after leaching for 15 days; in the bacteria system, the leaching rate is 47.4% after 15 days of leaching. Centrifuge at 4200 rpm for 5 minutes to obtain scandium-containing supernatant, and then undergo conventional extraction, washing, and back-extraction to obtain the primary enrichment of scandium.

Embodiment 2

[0026] Grind scandium-containing minerals to particles with a particle size of 0.037mm to 0.074mm, put them into nutrient culture solution, sterilize at high temperature, and then inoculate bacteria. The leaching conditions are: the pulp concentration of the leach solution is 2%, and the initial bacterial concentration for inoculation is 2.0×10 8 cells / ml, the concentration of bacteria in the leaching system after inoculation was 2.0×10 7 cells / ml, the pH value of the culture solution is 7.2, the shaking table rotates at 200 rpm, and the temperature is 30°C. When scandium-containing minerals are in the aseptic system, the scandium leaching rate is almost zero after leaching for 15 days; in the bacterial system, the leaching rate is 42.5% after 15 days of leaching. Centrifuge at 4200 rpm for 5 minutes to obtain scandium-containing supernatant, and then undergo conventional extraction, washing, and back-extraction to obtain the primary enrichment of scandium.

Embodiment 3

[0028] Grind scandium-containing minerals to particles with a particle size of 0.037mm to 0.074mm, put them into nutrient culture solution, sterilize at high temperature, and then inoculate bacteria. The leaching conditions are: the pulp concentration of the leach solution is 10%, and the initial bacterial concentration for inoculation is 4.0×10 8 cells / ml, the concentration of bacteria in the leaching system after inoculation was 4.0×10 7 cells / ml, the pH value of the culture solution is 7.2, the shaking table rotates at 200 rpm, and the temperature is 30°C. When scandium-containing minerals are in the aseptic system, the scandium leaching rate is almost zero after 10 days of leaching; in the bacterial system, the leaching rate is 21.8% after 10 days of leaching. The static precipitation method is used for solid-liquid separation. After 60 minutes of precipitation, a scandium-containing clear liquid can be obtained, and then the primary enrichment of scandium can be obtained...

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Abstract

The invention relates to a bacillus and a method for bio-leaching of scandium from scandium-containing minerals by virtue of the bacillus. The method comprises the following steps: crushing the scandium-containing minerals and grinding the scandium-containing minerals until grain size is 0.037-0.074mm, adding obtained scandium-containing mineral powder to a microorganism-containing culture solution, controlling a pulp concentration as 1-10%, and conducting bio-leaching for 7-15 days, wherein a leaching rate is 20-50%; and centrifuging or settling-separating a leached pulp, so that a scandium-containing solution is obtained, and conducting extracting, conducting washing and conducting reverse-extracting as conventional means, so that a scandium primary concentrate is obtained. The method disclosed by the invention, which is free from the addition of acid during leaching, can reduce production cost and achieve green scandium leaching, without pollution to environment; and the scandium in a leachate can be enriched by virtue of a conventional method. The biological method is green and environment-friendly, simple in process and easy for popularization.

Description

technical field [0001] The invention relates to a metallurgical process of rare metals, which is a green biotechnology, especially a method for biologically leaching scandium from scandium-containing minerals by using a bacillus. Background technique [0002] Scandium belongs to scattered metals. The independent minerals of scandium include scandium yttrium ore, hydrophosphorous scandium ore, silicon scandium ore and titanium silicate dilute gold ore. rare. Most scandium is distributed in other minerals such as ilmenite, zirconite, vanadium titanomagnetite, tungsten ore, aluminum ore and other minerals in isotropic or adsorption state. [0003] Conventional scandium extraction is based on intermediate products such as red mud and chlorinated dust as raw materials, and scandium is leached under high acid and high temperature conditions. For example, the Chinese invention patent document with publication number CN103352130A and publication date of 2013-10-16 discloses a meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/20C22B3/18C22B59/00C12R1/07
CPCC22B3/18C22B59/00C12N1/205C12R2001/07
Inventor 程蓉廖祥文朱昌洛沈明伟冀成庆舒荣波
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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