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Method for vulcanizing low-grade oxidized nickel ore with microbiological method

A microbial method and oxidation-type technology, applied in the field of microorganisms, can solve the problems of difficult expansion of application range, large consumption of sodium sulfide, high production costs, etc., and achieve good industrial application prospects, low processing costs, and low environmental pollution.

Active Publication Date: 2014-01-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vulcanizing agent used in vulcanization flotation is mainly sodium sulfide. When activating the oxidized ore, the consumption of sodium sulfide is relatively large (generally, the dosage per ton of ore is tens of grams to one kilogram), resulting in high production costs, and the residual sodium sulfide enters the Mineral processing wastewater also brings difficulties to tailings treatment
And because sodium sulfide is unstable in the air, easy to deliquescence, impact or rapid heat can cause explosion, its production, storage and transportation are difficult, which makes it difficult to expand its application range, and it is mainly used in copper mines. There are few studies involving nickel, Flotation recovery of zinc and other oxide ores

Method used

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  • Method for vulcanizing low-grade oxidized nickel ore with microbiological method

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Experimental program
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Effect test

Embodiment 1

[0024] Take 2 kg of an oxidized nickel ore, crush and grind it to obtain a slurry with a particle size of -200 mesh, accounting for 80%, and make it into a slurry with a solid content of 20%. The sulfate-reducing bacteria-producing hydrogen sulfide reactor is filled with polyurethane foam as an immobilized carrier, and the inoculation amount of bacteria is 20%-50% (V / V). Use a peristaltic pump to continuously pump it from the bottom of the reactor, and the inflow flow rate is 1~3mL min -1 , the concentration of sulfate in the influent medium is gradually increased periodically (the conversion rate of sulfate reaches more than 80%), and each increase is 0.5g L -1 , the COD (Chemical oxygen demand, chemical oxygen demand) in the medium also increases accordingly, maintaining the COD / SO in the influent medium 4 2- The ratio is constant. When the sulfate-reducing bacteria hydrogen sulfide production unit is successfully started and runs stably, and the total sulfide production ...

Embodiment 2

[0026] Take a certain amount of oxidized nickel ore, crush and grind it to obtain a slurry with a particle size of -250 mesh, accounting for 70%, and make it into a slurry with a solid content of 20%. Sulfate-reducing bacteria-producing hydrogen sulfide reactors are filled with modified activated carbon materials as immobilized carriers, and the inoculation amount of bacteria is 10%~30% (V / V). Use a peristaltic pump to continuously pump it from the bottom of the reactor, and the inflow flow rate is 1~3mL min -1 , the concentration of sulfate in the feed medium is gradually increased periodically (the removal rate of sulfate reaches more than 80%), when the total sulfide production is continuously stable above about 400mg / L, the outlet liquid in the reactor is removed into the vulcanization reactor for chemical reaction. Control reaction temperature is 40~70 ℃, reaction time 1 hour, nickel flotation recovery rate is 50%~70%.

Embodiment 3

[0028] Take a certain amount of oxidized nickel ore, crush and grind the ore to make the pulp particle size -300 mesh, accounting for 90%, and make it into a pulp of 20% (solid content). The sulfate-reducing bacteria-producing hydrogen sulfide reactor is filled with polyurethane foam as an immobilized carrier, and the inoculation amount of bacteria is 20%~40% (V / V). Use a peristaltic pump to continuously pump it from the bottom of the reactor, and the inflow flow rate is 2~3mL min -1, the concentration of sulfate in the feed medium is gradually increased periodically (the removal rate of sulfate reaches more than 80%), when the total sulfide production is continuously stable above about 400mg / L, the outlet liquid in the reactor is removed into the vulcanization reactor for chemical reaction. Control reaction temperature is 50~70 ℃, reaction time 1 hour, nickel flotation recovery rate is 50%~70%.

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Abstract

The invention provides a method for vulcanizing low-grade oxidized nickel ore with a microbiological method. According to the invention, sulfate is reduced by using sulfate-reducing bacteria, such that hydrogen sulfide is produced, and is used as a vulcanizing agent of the oxidized nickel ore. Through means of regulating temperature, vulcanizing agent dose, pH value, and the like, oxidized nickel ore surface vulcanization is carried out. A floatation technology is used for processing the vulcanized ore, such that low-grade oxidized nickel ore can be effectively processed. With the method provided by the invention, processing cost is low, the process is simple and easy to operate, environment pollution is low, and valuable metal ion recovery rate is high. The method has excellent industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of microorganisms. In particular, it relates to a method for sulfiding low-grade oxidized nickel ore using a microbial method, which is a process method for sulfiding low-grade oxidized nickel ore using a microbial method of sulfate reducing bacteria (SRB, sulfate reducing bacteria). Background technique [0002] Aiming at the problem that oxidized ores are difficult to recover by flotation, some researchers have suggested that oxidized ores can be sulfided first, and then flotation. Sulfidation, the wet process of converting non-sulfide mineral surfaces to sulfide-like surfaces, is an attractive method for treating oxidized sulfide ores. Flotation of oxidized copper-cobalt minerals by sulfidation method has a successful precedent. Ou Leming et al. aimed at a refractory copper-cobalt oxidized ore in Congo (Kinshasa) with high oxidation rate, high binding rate, severe mudification, and high content of harmfu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B23/00
CPCY02P10/20
Inventor 曹俊雅张广积李媛媛杨超毛在砂方兆珩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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