In this paper the results of a leaching kinetics study of bauxite ore with sodium hydroxide are presented. The effect of ore particle size, sodium hydroxide concentration and reaction temperature on the Al2O3 extraction rate was determined. The results obtained showed that 99% of Al2O3 was leached out using -200+270 mesh ore particle size at a reaction temperature of 105 °C for 60 min reaction ...

the gheshlagh bauxite deposit is located 110 km southeast of gorgan. the deposit has been developed as a stratiform horizon with more than 2 km length and a thickness of about 25 m along the contact of ruteh and elika carbonate formations. textural analysis indicates both allochthonous and autochtonous origins for the bauxites. bohemite, diaspore, anatase, rutile, hematite, goethite, kaolinite,...

?ining waste, processing by-products and mine water discharges pose a serious threat to the environment as in many cases they contain high concentrations of toxic substances. However, may also be valuable resources. The main target current review is comparative study occurrence rare earth elements (REE) mining waste produced from exploitation coal, bauxite, phosphate rock other ore deposits. Co...

As a developing country, China is also major producer and consumer of mineral resources. At present, still in critical period rapid development industrialization urbanization, which will inevitably lead to huge resource consumption. It only 30 years between the peak carbon consumption timepoint planned achieve goal neutrality. Coming from background dual pressure terms total amount intensity “c...

Bauxite, in central Guizhou, is predominantly karst bauxite, but there insufficient research on the effect of paleogeomorphology bauxite development. Xiaoyuan also a and high- low-iron deposits exist study area. This conducts geological modeling using controlled-source audio-frequency magnetotelluric (CSAMT) data drill core data. The effects deposition mineralization are evaluated by assessing ...

IND Pub * Ithac WA. cally. Mont Oppo and comm Using data from 84 hospitals linked to Equal Employment Opportunity Commission discrimination-charge data, we consider how four human resource (HR) structures affect hospitals’ receipt of discrimination charges. HR structures that establish accountability (affirmative action plans, EEO units) are marginally related to charges. Structures that modera...