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

Abstract

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.

A comprehensive review of bioleaching optimization by statistical approaches: recycling mechanisms, factors affecting, challenges, and sustainability

“…Under optimum conditions of 120-140 mesh of particle size, 170 rpm of shaking speed, and 111 mL of inoculation size, desulfurization efficiency rose 8.1% over 5 days. 69 Mo et al (2019) investigated the effect of four signicant parameters on U biorecovery: pH value, initial Fe 2+ , solid-liquid ratio, and inoculation percentage. CJ6-0, a consortium of microbial strains, was utilized consisting of Acidithiobacillus sp.…”

“…Under optimum conditions of 120–140 mesh of particle size, 170 rpm of shaking speed, and 111 mL of inoculation size, desulfurization efficiency rose 8.1% over 5 days. 69 …”

Study on the experiment and reaction kinetics of sulfur removal from coal by microorganisms

“…At present, coal desulfurization methods mainly include physical method ( Cano et al, 2018 ; Ait-Khouia et al, 2021 ), chemical method ( Rehman et al, 2018 ; Xia, 2018 ; Ge et al, 2021 ; Xu et al, 2021 ), and biological method ( Liu et al, 2019 ; Kotelnikov et al, 2020 ; Tang et al, 2021 ). Among them, microbial method has become the research focus and development trend in the field of coal desulfurization because of its clean and environmental protection, low process cost, simple process, low energy consumption, mild conditions and other characteristics.…”

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

“…It has been proven that microbial desulfurization could be applied to sulfur-ore fire fighting, with the advantages of simple operation, cheap raw materials, mild reaction conditions, and less environmental pollution, compared with other technologies. Hence, many scholars have shifted their attention to microbial desulfurization technology [ 11 ].…”