Revolving drum type bioreactor used for microorganism lixiviation
A bioreactor, microbial leaching technology, applied in the direction of improving process efficiency, can solve the problems of small gas-liquid mass transfer interface, insufficient gas-liquid contact, reducing the effective volume of the reactor, etc., to achieve high mass transfer performance, improve Efficiency, good mixing effect
Inactive Publication Date: 2010-05-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology
Mineral dissolution rate is 600g m at 30% (w / v) solids concentration -3 h -1 , an order of magnitude higher than the highest leaching rate achieved so far. The Vargas group used Thiobacillus ferrooxidans to leach gold-bearing concentrates at a slurry concentration of 50% w / w (equivalent to 25% v / v) at a rotational speed of 0.5~1rpm, the leaching time reaches 80 days, which reflects the advantages of the drum bioreactor: ①Complete mixing, no dead zone; ②The shear force is only generated by the relative movement when the falling liquid film enters the slurry at the bottom of the drum. But they did not solve the key problem of how to improve the efficiency of the bioreactor. Rossi's gas distribution device is not immersed in the liquid, the gas-liquid contact is not sufficient, and the gas-liquid mass transfer interface is small (only through the gas-liquid interface and the barrier in the headspace. falling film on the plate for oxygen transfer), and reduces the effective volume of the reactor (filling factor is less than 50%). The reactor proposed by Herrera et al. also has no effective gas dispersion device (Herrera M N, Escobar B, Parra N , et al.Bioleaching of Refractory Gold Concentrates at High Pulp Densities in a Nonconventional Rotating-Drum Reactor[J].Minerals and Metallurgical Processing.1998,15(2):15~19
), and the ratio of the liquid-solid volume of the reaction system to the reactor volume is only about 13%, which leads to extremely low utilization efficiency of the reactor and has no practical application value
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[0045] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0046] See Figure 5A , 5B The rotary drum bioreactor for microbial leaching shown. On the side wall of the rotary drum with the central fixed shaft 4, there is a material inlet and outlet 10, and a gas tube extending into the rotary drum is installed at the fixed shaft of the rotary drum. Conduit, the air inlet 5 of the gas conduit is outside the drum, and the gas outlet 6 is inside the drum; 8 baffles 7 are installed on the inner wall of the drum, and the baffles are installed and fixed on the two end faces of the reactor , the length direction of the baffle plate is parallel to the direction of the fixed shaft; the temperature-controlled heat exchanger 9 and electrode 8 fixed on the central fixed shaft 4 are installed in the drum, and the gas that extends into the drum through the connecting conduit The three gas distribution devices with micropore...
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Abstract
The invention relates to the mineral biological treatment technical field, in particular to a biological reactor used for microbiological leaching of sulphide ores, wherein, the reactor can process high concentration pulps and realize effective mixture and oxygen supply. The invention comprises a revolving drum which is provided with a central fixed shaft, a baffle plate which is fixed on the revolving drum and rotates along a shaft center of the revolving drum, a heat exchanger which is statically connected on the fixed shaft when the revolving drum rotates and controls temperature, an electrode and a gas distributing device which is provided with micropores. The invention has the advantages of capability of providing suitable environment for microorganism to grow and breed, capability ofprocessing higher concentration of the pulps, and improvement of microbiological leaching efficiency. The biological reactor of the invention is suitable for other biological reaction systems containing solid particles like microbiological desulphurization and immobilized enzymes of coal and so on.
Description
technical field [0001] The invention belongs to the technical field of biological treatment of minerals. More specifically, the invention relates to a bioreactor for microbial leaching of sulfide ores, wherein the reactor can handle high-concentration pulp and realize effective mixing and oxygen supply. Background technique [0002] Under the conditions of rich ore, easy-to-handle ore decreasing, environmental protection requirements increasing, and modern industry's increasing demand for metals, traditional metallurgical processes cannot meet the needs, and research on microbial leaching has attracted widespread attention. At present, the most researched and most widely used method is the leaching of valuable metals in metal sulfide ores by microorganisms. [0003] Compared with traditional metallurgical processes, bioleaching has the following advantages: [0004] (1) The reaction is mild and the process is relatively simple, so the operation and maintenance costs are rel...
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IPC IPC(8): C22B3/18
CPCY02P10/20
Inventor丛威金建刘国梁石绍渊方兆珩
OwnerINST OF PROCESS ENG CHINESE ACAD OF SCI