Experimental and theoretical study on strengthening leaching of sulfide ores by surfactants

Pan, Wei; Jin, Huimin; Liu, Zhengzhou; Tang, Jiahui; Cheng, Shuiyuan

doi:10.1016/j.psep.2020.02.037

Cited by 24 publications

(8 citation statements)

References 28 publications

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“…In this study, by optimizing the three factors the surface desulfurization rate was increased by 53.3%. In previous studies, the surface desulfurization rate was also significantly improved by optimizing the single factor of surfactant concentration [25]. In this study, six desulfurization-related factors were considered, three of which were optimized, and the effect was more prominent.…”

Section: Discussionmentioning

confidence: 97%

“…The six experimental factors selected were particle size of ore sample, ambient temperature, rotary speed of the shaking table, volume of bacteria liquid, concentration of leaching aid, and pH value of the acidizing ore sample. In our previous study, different types of leaching aid were compared, and Tween80 proved to be the best [25]. Therefore, Tween80 was chosen as the leaching aid in this experiment.…”

Section: Optimization Of Microbial Desulfurization Of Sulfide Ore 241...mentioning

confidence: 99%

“…In the field of sulfide ore biodesulfurization, some researchers separated pyrite and chalcopyrite from quartz and calcite after interaction with bacterial cells and bacterial biomass [23] and explored the effect of pH buffers on microbial desulfurization efficiency [24]. Previous studies have reported on the use of surfactants to enhance the desulfurization effect, promote contact between bacteria and the ore, and improve the leaching of sulfide ores [25]. At present, most of the microorganisms used in ore leaching are autotrophic bacteria, which only need simple inorganic materials, eliminating the need for complex organic matter in the leaching process.…”

Section: Introductionmentioning

confidence: 99%

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Optimization Studies on Biological Desulfurization of Sulfide Ore Using Response Surface Methodology

Tang

Feng

Zeng-ling³

et al. 2021

Minerals

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This research aimed to optimize the experimental conditions of biodesulfurization of sulfide ore and to evaluate the flame-retardant effect after desulfurization under optimal conditions. Six experimental factors were determined: particle size of ore sample, ambient temperature, rotary speed of the shaking table, volume of bacteria liquid, concentration of leaching aid (Tween80), and pH value of acidizing ore sample. Desulfurization efficiency was used as the main characterization index of the desulfurization effect in optimization studies. Particle size of ore sample, rotary speed of the shaking table, and volume of bacteria liquid inoculated were selected as significant factors by a Plackett–Burman experiment. Modeling, optimization, and analysis of the interactive effects of these factors, notably between particle size and bacteria liquid, were performed using a Box–Behnken design with response surface methodology. The optimum operating conditions were found to be: particle size of 120 to 140 mesh, rotary speed of 175 rpm, and bacteria liquid of 111 mL. Under these conditions, a significant rise of 8.1% was seen in 5-day average desulfurization efficiency. The 5-day oxidation weight gain rate of desulfurized ore was 2.73%, while that of the control group was 4.78%. The results show that, after optimized desulfurization, the surface oxidizability and spontaneous combustion tendency of the ore are reduced.

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Section: Discussionmentioning

confidence: 97%

Section: Optimization Of Microbial Desulfurization Of Sulfide Ore 241...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization Studies on Biological Desulfurization of Sulfide Ore Using Response Surface Methodology

Tang

Feng

Zeng-ling³

et al. 2021

Minerals

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“…Recently, some researchers conducted experiments to find a negative correlation between the particle size of sulfide ore and desulfurization [ 21 ]. Additionally, studies have reported on the utilization of surfactants to strengthen the microbial desulfurization effect [ 22 ]. Although various aspects of microbial desulfurization were studied, its efficiency and rate remain low due to the interaction between microorganisms and a relatively complex process on the ore surface, and there is a certain obstruction when the bacterial solution is in contact with the ore [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Enhancing Microbial Desulfurization of Sulfide Ores Using Ultrasonic Treatment

Pan

Liao

et al. 2022

Materials

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Ultrasonic technology is being increasingly explored in minerals processing. In this paper, ultrasonic treatment was introduced as a novel method for microbial desulfurization of sulfide ores. A Box–Behnken experiment was performed to find the best combination of factor levels for the following experiments; consequently, the combination of factor levels at the maximum 5-day average desulfurization rate at 20 g of ore was a particle size of 120–140 mesh, a shaker speed of 175 rpm, and a dosage of 111 mL of bacterial solution. Under these conditions, a microbial desulfurization experiment of sulfide ores by ultrasonic treatment was carried out, and the effect of the particle size, the ultrasonic action time, and the ultrasonic power were investigated. Results indicated that the ultrasonic effect was not significant for ore samples with larger particle sizes, and the appropriate increase in ultrasonic action time was beneficial to the improvement of desulfurization rate, but the effect showed a decreasing trend when it exceeded 50 min, and the best desulfurization effect was achieved when the power was 300 W. This study demonstrated that the effect of microbial desulfurization can be greatly enhanced by ultrasonic treatment.

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“…Once the self-heating of sulfide ores occurs, the spontaneous combustion fire will occur when the temperature of ore heap reaches the ignition point of ore. e prevention and control on spontaneous combustion of sulfide ores are always the main safety problem for sulfide ore deposits. It is very important to exactly measure the spontaneous combustion tendency of sulfide ores in order to protect the safety of miners' life, maintain the normal production of mine, and make good utilization of the natural resources [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Determination Method for Self-Heating Initiative Temperature of Sulfide Ores

et al. 2020

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The purpose of this article is to explore a new method to determine the self-heating initiative temperature of sulfide ores for preventing spontaneous combustion of sulfide ores. Two typical ore samples with self-heating characteristics are studied by wavelet transform, recursive graph analysis, Hurst index extraction, and approximate entropy detection. On this basis, self-heating initiative temperature of sulfide ores was measured. The results indicate that the Hurst index of both ore samples in the experiment is greater than 0.5; moreover, the Hurst index in the later period of the experiment is greater than that of the earlier period. The self-heating of sulfide ores is an unsteady process with positive persistence and obvious mutation, so the possibility of self-heating of sulfide ores can be determined according to the change characteristics of Hurst index. The mutation times of the two samples are 864 min and 819 min, respectively, reference values of self-heating initiative temperature are 219.4°C and 232.3°C, and the average relative error is only 1.49%, which are in good agreement with the measured values, and therefore, it provides basis for safety production of high-sulfur ore mine.

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Experimental and theoretical study on strengthening leaching of sulfide ores by surfactants

Cited by 24 publications

References 28 publications

Optimization Studies on Biological Desulfurization of Sulfide Ore Using Response Surface Methodology

Optimization Studies on Biological Desulfurization of Sulfide Ore Using Response Surface Methodology

An Experimental Study on Enhancing Microbial Desulfurization of Sulfide Ores Using Ultrasonic Treatment

Nonlinear Determination Method for Self-Heating Initiative Temperature of Sulfide Ores

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