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最近，研究了一种叫多钨酸钠（SPT）的无机盐，可有效地用来制备相对密度达3．1的无毒溶液，此盐价格昂贵，且在达到较高相对密度时粘度很高。在将来，也许可能发现能克服这些缺点的另一些无机化合物。澳大利亚矿物研究有限公司已着手进行另一些无机化会物的课题研究。研究发现，把细粒分散的硅铁添加到SPT溶液中可使其相对密度达4．0，并应用此法在实验室对筛分矿物样品进行密度分级的实验。目前正扩大研究，在动态系统中，应用此类液体和悬浮液对矿物、煤和废料回收进行分选的可能性，
Recently, an inorganic salt called Sodium Tungstate (SPT) has been studied that can be effectively used to prepare nontoxic solutions with a relative density of 3.1. This salt is expensive and very viscous at higher relative densities high. In the future, it may be possible to find other inorganic compounds that overcome these shortcomings. Australian Mineral Research Limited has embarked on a number of other topics of inorganic compounds. The study found that the fine dispersion of ferrosilicon added to the SPT solution can make its relative density of 4.0, and the application of this method in the laboratory screening of mineral samples for density grading experiments. Research is being expanded to explore the possibility of using such liquids and suspensions to separate mineral, coal and waste materials in dynamic systems,