艾斯卡熔矿测定铜阳极泥中的银   总被引：1，自引：0，他引：1  

王璇 《江苏地质》1999,23(1):38-39

采用碳酸钠—氧化锌半熔法分解试样,火焰原子吸收光度法测定铜阳极泥中０Ｘｋｇ／ｔ－ＸＸｋｇ／ｔ银,测定结果可满足工业生产原料分析及生产质量控制分析要求。  相似文献   

平果铝土矿洗矿泥沉降试验研究     

李佩鸿 《南方国土资源》1997,(3)

用多种无机凝聚剂和聚丙烯酰胺系列絮凝剂对平果铝土矿洗矿泥进行沉降试验。结果表明，阴离子型和非离子型聚丙烯酰胺适用于平果铝土矿洗矿泥的絮凝沉降。推荐使用分子量为６００～９００万的阴离子型或非离子型聚丙烯酰胺作絮凝剂。  相似文献   

Production of polysaccharide slime by microbial mats in the hypersaline environment of a Western Australian solar saltfield   总被引：3，自引：0，他引：3  

J. M. Roux 《International Journal of Salt Lake Research》1996,5(2):103-130

Of the many microorganisms present in the hypersline environment of the saltfield studied, the cyanobacteriumSynechococcus was found to be the major producer of polysaccharide slime. When dissolved in the brine, this slime caused elevated brine viscosities which impaired the quality of the salt crystallised from such brine.Synechococcus was present in benthic microbial mats throughout the 6 concentrating ponds of the saltfield, but it dominated in the ponds where brine density was above 1.10 g cm^–3, corresponding to the saturation density of gypsum (CaSO₄·2H₂O). At such density,Synechococcus was always associated with copious amounts of slime. At lower density, the nature of the substratum over which the mat was growing affected the slime content and productivity of the mat, presumably relatively to its ability to supply nutrients to the mat. Under laboratory conditions, the addition of gypsum stimulated the growth ofSynechococcus in the presence of excess phosphate (>15 mg L^–1 PO₄-P). Slime production however was not stimulated by high salinity, addition of (CaSO₄·2H₂O), NaSO₄ or nitrate deficiency. Only as cultures entered a stationary phase of growth did slime production increase. It was concluded that a nutrient limitation was probably responsible for the activation of extracellular polysaccharide production, possibly as a means of disposing of excess photosynthetically fixed carbon.  相似文献