-This paper studies several kinetic aspects of semi-batch flotation of celestite and calcite in a mechanical or subaeration cell with sodium oleate as the collector agent, using pure minerals ranging in size between 177 and 74 pm, respectively, with a constant pH = 9 in the flotation bath in all experiments. The results obtained indicate that both minerals float rapidly and that the flotation r...

It is possible to obtain good performance from a flotation plant but it has proved difficult to maintain such performance. Recovery rates on a flotation plant can be around 90% and often lower, making flotation one of the least efficient processes in the concentration path. Hence, over the last few decades much research and development has gone into the stabilization and optimization of flotati...

LOW DENSITY LIPOPROTEINS (LDL) AND HIGH DENSITY LIPOPROTEINS (HDL) FROM THE PLASMA OF PATIENTS WITH FAMILIAL LECITHIN: cholesterol acyltransferase (LCAT) deficiency have been characterized by gel filtration, analytical ultracentrifugation, and gel electrophoresis, and their relative content of lipid and protein has been determined. The LDL of d 1.019-1.063 g/ml show marked heterogeneity. A subf...

Solid/liquid separations are commonly the first step in any wastewater treatment. Such technologies are mature and new developments are rare. However, in the last decade some significant improvements in separation techniques for industrial wastewater pretreatment have been implemented. Advances in the technology include more efficient, faster centrifugal mixing of treatment chemicals and wastew...

The effect of impeller speed on the air flow in a selfaerated Denver laboratory flotation cell was investigated using computational modelling. Air is induced into the slurry by the impeller’s rotating action. The rate of air flow is determined by the suction pressure created by the impeller, the hydrostatic head of the slurry and the frictional losses along the delivery shaft from the inlet val...

Graphite ore collected from Hunan province, south China was characterized by chemical analysis, X-ray diffraction, and optical microscopy. Rougher and multi-stage flotation tests using a mechanical flotation cell and a flotation column containing an additional centrifugal force field were carried out to promote its grade and economic value. In rougher flotation, both the mechanical flotation ce...

The lack of quick, simple, and sensitive quantitative tests has impeded studies on infection patterns and treatment of Giardia spp. and Cryptosporidium spp. A quantitative direct immunofluorescence assay (FA) using a commercial FA kit was developed and evaluated. Recovery rates of the FA for Cryptosporidium oocysts in calf feces seeded with 1,000, 10,000, 100,000, and 1,000,000 oocysts per g we...

Carbon tetralchloride was injected into normnal rabbits and the levels of Sf 3-12, 12-20, alnd(20-40 lasses of lipoproteins were determined during the course of these injections. A marked increase in concentration of these three classes of lipoproteins occurred during the administration of carl)on tetra(hloride. After the cessation of this drug, the lipoproteins of largest Sf rate returned to n...

The influence of conditioning on the flotation of pyrrhotite in the presence of chlorite was investigated through flotation tests, sedimentation tests, and X-ray photoelectron spectroscopy (XPS) analysis. The flotation results show that chlorite slimes dramatically impair the flotation of pyrrhotite. Sedimentation and flotation tests reveal that conditioning can effectively remove chlorite slim...

partially replace oil and natural gas as fuel sources. Of all the coal-cleaning pmesses, flotation is one. of the most versatile. Carbon dioxide coal flotation is a new technology developed at the University of Utah.(l) Compared with conventional flotation, carbon dioxide flotation enhances the ash rejection and increases flotation recovery for coals of different rank with the exception of lign...