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要提高细粒嵌布铁矿石的品位,浮选前的选择性脱泥是一个关键步骤。选择性脱泥的一个先决条件是矿浆的适当分散。一般用硅酸钠作分散剂。可以用沉降试验、萃取试验、选择性絮凝试验和电子显微镜观察检查存在 Ca~(2+)和 Mg(OH)_2沉淀时硅酸钠分散矿浆的机理。文章描述了钙、镁、硅酸钠含量与石英的絮凝、分散范围的函数关系。加入硅酸钠时,石英-针铁矿的人工混合物矿浆发生无选择性分散。在低硅酸钠含量时,加入颗粒淀粉有助于针铁矿的絮凝胜于石英;在高硅酸钠含量时,加入颗粒淀粉不起作用。文章描述了解释这些物种(species)存在时矿浆分散的模型。
To improve the grade of fine-grained iron ore, selective desliming before flotation is a key step. A prerequisite for selective desliming is the proper dispersion of the slurry. Sodium silicate is generally used as dispersant. Sedimentation tests, extraction tests, selective flocculation tests and electron microscopy can be used to examine the mechanism of sodium silicate dispersion in the presence of Ca 2+ and Mg (OH) 2 precipitates. The article describes the calcium, magnesium, sodium silicate content and quartz flocculation, dispersion range as a function of. When sodium silicate is added, the artificial mixture slurry of quartz-goethite is selectively dispersed. At low sodium silicate levels, the addition of granular starch helps goethite flocculate better than quartz; at high sodium silicate levels, addition of granular starch does not work. The article describes a model that explains the slurry dispersion in the presence of these species.