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The optimized rougher flotation conditions (Table-3) were: pH of pulp 8.5; grind size of ore 80% passing 100 mesh; the amount of lead nitrate as stibnite activator 300 g/ton; amyl xanthate as a stibnite collector 120 g/ton; pine oil as a frother 30 g/ton; sodium silicate as a gangue depressor 200 g/ton and sodium cyanide as a pyrite depressor 50 g/ton.
In coal gangue paste-filling process, the experimental platform of the sensor measurement accuracy is built.
Apparently, the system mainly consists of two subsystems, namely, gangue transportation system and coal transportation system.
Li et al., "Pollution of organic compounds and heavy metals in a coal gangue dump of the Gequan Coal Mine, China," Chinese Journal of Geochemistry, vol.
Because of differences in roof "large structure" and the roadside support principle [17-19], there are significant differences in roadside support material requirements between the GER with fully mechanized gangue backfilling mining and the GER in which roofs are managed using the caving method.
Wang, "Strata movement induced by coal-pillar under three circumstances exchange by gangue backfill and quadratic stability law," Chinese Journal of Rock Mechanics and Engineering, vol.
Rock block N falls completely on caved coal gangue. Rock block M rotates with the advance of the mining coal face.
The product layer (magnetite layer) thickened with the progression of reduction, and the unreacted gangue in the hematite ore particle was inevitably encapsulated by the new-generation magnetite ([Fe.sub.3][O.sub.4]).
De modo geral, os meios de comunicacao local, a policia e o imaginario social tomam gangue <galera> e turma de jovens envolvidas em acoes delituosas como termos correlatos, nao fazendo distincao entre: as consideradas formas legitimas> de agregacao juvenil, que levam os jovens a estarem juntos por interesses bem alheios a violencia, mas que nao os impedem de cometer transgressoes e delitos; e as <formas delinquentes> de agregacao, nas quais a transgressao e violencia sao norma.
Na formacao dos novos grupos sociais, observamos o conceito de gangue como sendo um conjunto de jovens, residentes na mesma vizinhanca, os quais, regularmente, praticam diversas atividades, que vao desde pequenas contravencoes chegando ate mesmo a crimes de maior potencial ofensivo (FREITAS, 2002, p.79).
Em sua analise de diversas centenas de gangues em Chicago, no inicio do seculo XX, Thrasher (1927) demonstra a forma com que esses diferentes grupos se desenvolvem a margem de uma sociedade em mutacao, e sublinha a especificidade, bem como a variedade de principios eticos que se forjam ao seio de cada gangue.
Other topics include the degradation of sodium dodecyl benzene sulfonate in laundry water, molybdenum doped vanadium dioxide thermochromic thin films for smart windows, a circular eco-industrial park for comprehensive utilization of coal gangue, and carbon fiber paper for proton exchange membrane fuel cells.