Papers by Keyword: Diaspore

Abstract: The effects of biosorption time and cell concentration on adsorption amount on the surface of diaspore, kaolinite and quartz were studied by using two kinds of silicate bacteria ____Bacillus circulans and Bacillus mucilaginosus, and three kinds of silicate minerals . the experimental results show that two kinds of silicate bacteria absorb more easily on the surface of diaspore than on that of kaolinite and quartz, and the adsorption amount of the strain of B•M is always higher than that of the strain of B•C on the surface of diaspore, kaolinite and quartz .The possible reason is that the pHPZC of diaspore is higher than that of kaolinite and quartz, and the strain of B•M probably produce more metabolites charged negatively than that of B•C in incubation process.

Abstract: The effects of microwave radiation pretreatment on the leaching behavior of diaspore were investigated. The influence of sodium hydroxide addition, microwave irradiation temperature and microwave irradiation time were studied, the mechanism of microwave roasting pretreatment was also studied. The results show that microwave roasting pretreatment can greatly improve the leaching efficiency of Al₂O₃, and decrease the mole fraction of digestion liquor. The optimal microwave roasting condition is that the sodium hydroxide addition is 100kg/t, the microwave irradiation temperature is 535°C, and the microwave irradiation time is 5min the roasting mechanical is that the increase of effective affecting acreage and the formation of high active alumina.