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Chromium reducing method based on iron-containing sulphide ore under action of acidophilic bacteria

A technology of acidophilic bacteria and sulfide minerals, applied in the direction of improving process efficiency, can solve the problems of restricting large-scale industrial application, low utilization rate of reducing substrates, low microbial reduction and remediation treatment efficiency, etc., and achieve large-scale industrialization. Use, speed up reduction reaction kinetics, overcome the effect of low utilization efficiency

Active Publication Date: 2015-04-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current traditional reducing agent has a large amount of consumption, high price, and complicated treatment process, while the microbial reduction repair treatment has low efficiency, long time, and high treatment cost, which also limits its large-scale industrial application to a certain extent.
Iron-containing sulfide minerals have been industrially used in chromium reduction treatment, but during the chromium reduction process, a passivation layer will be formed on the surface of pyrite minerals to inhibit the reduction process, resulting in low utilization of the reduced substrate, short utilization time, and low reduction efficiency

Method used

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  • Chromium reducing method based on iron-containing sulphide ore under action of acidophilic bacteria
  • Chromium reducing method based on iron-containing sulphide ore under action of acidophilic bacteria
  • Chromium reducing method based on iron-containing sulphide ore under action of acidophilic bacteria

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The method described in this example mainly includes the following steps:

[0038] 1) Expand Acidithiobacillus ferrooxidans in 9K medium containing 10g / L sulfur powder. The initial pH value is 2.0, and the culture temperature is 30°C. Filter the solid-liquid separation until it enters the logarithmic culture period, and the bacterial liquid passes through 12000rpm Collect by centrifugation for 10 minutes;

[0039] 2) Inoculate the collected Acidithiobacillus ferrooxidans into the 250mL shake flask system containing sulfur powder and pyrite ratio of 2.0g:0g, 1.5g:0.5g, 1g:1g; 0.5g:1.5g, 0g:2g, The concentration of bacteria after inoculation was 1.0×10 7 / mL, the particle size of pyrite is 200 mesh, the volume of Erlenmeyer flask is 250mL, the reaction volume is 100mL, the concentration of ore pulp is 2%, pre-oxidize to pH below 1, and add Cr(VI) solution (1000mg / L) to it. The dosage is 1mL per day, and it will be increased to 2mL per day in the later period. The dosage...

Embodiment 2

[0043] Carry out continuous fed-batch treatment in the column leaching reactor, the method described in this instance mainly comprises the following steps:

[0044] 1) Acidithiobacillus ferrooxidans was expanded in 9K medium containing 10g / L sulfur powder, the initial pH value was 2.0, and the culture temperature was 30°C. When it entered the logarithmic culture period, the solid-liquid separation was carried out by filtration, and the bacterial liquid was used for later use;

[0045] 2) Pyrite particles are filled in the column leaching reactor, and the pyrite particle size is less than 0.5cm particles; the chromium solution to be treated is pre-adjusted to about 3 with concentrated sulfuric acid, and flows into the column leaching reactor from the upper part of the reactor to control Reasonable flow rate to make it react completely. If the reaction is complete, pump the remaining liquid to the post-sedimentation tank.

[0046] 3) When the reduction ability of the pyrite chro...

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Abstract

The invention discloses a chromium reducing method based on iron-containing sulphide ore under action of acidophilic bacteria, belonging to the wastewater treatment technology of the environmental engineering field. The chromium reducing method comprises the following steps: introducing thermoacidphilic iron-sulfur oxidizing bacteria into a chromium reducing process of the iron-containing sulphide ore, and adhering a biological membrane on the surface of the pyrite. The chromium reducing method can be used for effectively relieving a passivation layer on the surface of the pyrite, overcoming the problem that the raw material utilization efficiency of the pure chemical reaction is low, greatly quickening kinetics of reduction, and completely utilizing the pyrite. After being reduced, the chromium, an iron ion and sulfate radical in the system can form precipitates such as jarosite and schwertmannite which are filtered and separated, so that the trivalent chromium ion in the system can be removed. The reduction government mode is wide in scope of application, low in site requirement and long in operation period and has large-scale industrial application potential.

Description

technical field [0001] The invention belongs to the field of environmental engineering wastewater treatment, and in particular relates to a chromium reduction method based on iron-containing iron sulfide ore under the action of iron-sulfur oxidizing acidophilus bacteria. Background technique [0002] Chromium salt is one of the main inorganic salt products, widely used in various sectors of national production, including electroplating, tanning, printing and dyeing, pigments, oxidants, medicines, catalysts and metal corrosion inhibitors, etc., and is used in at least 10% of commodities middle. With the development of industries related to chromium products, the incomplete treatment and discharge of chromium-containing wastewater has caused non-negligible harm to soil, groundwater, and industrial and agricultural production. One of the carcinogenic metals, it can cause liver damage, ulcers, respiratory allergies and respiratory cancer. [0003] The current chromium pollutio...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B3/44C22B34/32
CPCY02P10/20
Inventor 朱建裕甘敏宋子博周双揭诗琪刘新星
Owner CENT SOUTH UNIV
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