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Biological-chemical dipolar reactor leaching process

A bioreactor and chemical reactor technology, applied in the direction of improving process efficiency, can solve the problems of limited sulfide ore leaching rate, increased power consumption, and limiting the application value of traditional heap leaching technology, so as to improve ore leaching rate and increase Economic benefits, the effect of reducing environmental pollution

Active Publication Date: 2013-02-13
LANZHOU UNIVERSITY
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Problems solved by technology

But the heap leaching process of sulfide ore still has many deficiencies: ①Temperature is the key factor affecting the leaching of sulfide ore, but Thiobacillus ferrooxidans, which is the most widely used among known ore leaching microorganisms, can only survive below 35°C [2]
Oxygen is usually required to feed the mine pile, which increases power consumption [3] , but the improvement of sulfide ore leaching rate is limited
These unsatisfactory aspects limit the application value of the traditional heap leaching process

Method used

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Embodiment

[0022] Example Biological-chemical bipolar reaction system leaching of Jinchuan nickel ore

[0023] The main body of the process device is composed of bioreactors and chemical reactors, which are bipolar reactors connected in series. The bioreactor is a hollow glass tube (Φ3.0cm×40cm) with plugs at both ends, and its effective volume is 270ml. The effective volume of the chemical reactor is 300ml. When the bipolar reactor is in operation, the bioreactor is firstly connected with Thiobacillus ferrooxidans, and then the continuous culture system of Thiobacillus ferrooxidans is started, and the operating temperature is 30°C. When the microbial activity meets the requirements and the effective volumes of the bioreactor and the chemical reactor reach 270ml and 300ml respectively, the process of continuous leaching of Jinchuan nickel ore by Thiobacillus ferrooxidans begins. Wherein, 15g of Jinchuan nickel ore is added into the chemical reactor, and the operating temperature is 50°...

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Abstract

The invention discloses a mineral leaching technique of a double-stage biological and chemical reactor, which separates the traditional biological mineral leaching process into a biological reacting process with bacteria growth and Fe<2+> oxidation as well as a chemical reacting process with bacteria product oxidation and mineral leaching, and suitable conditions of the two processes are respectively controlled, thus improving efficiency of bacteria oxidation and mineral leaching. Compared with currently popular biological mineral leaching methods, the mineral leaching technique of the double-stage biological and chemical reactor greatly improves production efficiency.

Description

technical field [0001] The invention relates to a biological-chemical bipolar reactor leaching process, which mainly relates to a process for treating sulfide ore in combination with biological and chemical reactions based on iron-oxidizing bacteria, and belongs to the field of metallurgical bioengineering. Background technique [0002] Bioleaching is a hydrometallurgical process in which metals in minerals are dissolved by the action of certain microorganisms. At present, bioleaching is mainly used in the leaching of sulfide ores. The bioleaching processes of Thiobacillus ferrooxidans mainly include tank leaching and heap leaching. Tank leaching is to fully grind the raw materials (0.04-0.1mm) to ensure a sufficient specific surface area, then mix them with the leaching agent, and react under the conditions of vigorous stirring and a certain temperature, so the contact area between the two phases is large and the mass transfer The conditions are good and the leaching spee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18
CPCY02P10/20
Inventor 李红玉杨晓娟王玉建
Owner LANZHOU UNIVERSITY
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