Advanced Materials Research Vols. 581-582

Abstract: Biogenic gas is an important end-product of methanogenesis in an anoxic environment. Based on the coal, coal-gangue, mine water of Songzao Coal Mine and in the case of adding inoculums, the quantities of gas and the contents of methane are measured by the microorganism action, and also respectively measured fermentation broth and residues by NO3--N, NH4+-N, S2- , SO42-, the values of pH, metals and the organic matter. The results show that coal and coal-gangue are involved in the microbial role; the quantity of inoculums is directly related to the quantities of gas and the contents of methane, at the same time it has a certain degree of impact on the contents of NO3--N, NH4+ -N, S2- , SO42- and metals; besides, because of the microbial anaerobic fermentation, the contents of NH3+ are seriously substandard; overall, the group B which has a smaller proportion of coal-gangue has a less impact to the environment compared to the group A which has a larger proportion of coal-gangue. In the further research into the direction of organic matter and obtaining and using the biogas, we must prevent secondary pollution of groundwater at the same time.

Abstract: The removal of dissolvable Mn²⁺ from manganese residue was attempted using strong reduction at high temperature. The effects of the several parameters which including roasting temperature in range of 750-1050 °C and roasting time range of 60-360 min were investigated. An increase in roasting temperature from 750 °C to 1000 °C for 90 min increased manganese removal rate from 50.79% to 90.48%. But effect of roasting time on the rate of manganese removal was not obviously, just from 90.06% for 60 min to 94.76% for 360 min at 1000 °C.

Abstract: Sugarcane bagasses were used as raw materials to produce the hemicelluloses, and the effects of temperature, alkali consumption, time and liquid to solid ratio on the extraction yield of hemicelluloses were investigated. Through the analysis of the response surface method, results were concluded that the best extraction process conditions were as follows: NaOH concentration 10.60%, extraction time 4.34 h, solid-liquid ratio 1:40.59, actual extraction rate is 31.486%, corresponding to the model prediction 31.4447% basically.