Galiium Extraction And Separation From Shale Or ASH

With the development of science and technology, the demand of the element Gallium is increasing day by day, and its price is increasing rapidly because of its short accommodation. The price of element Gallium in international trade was higher than gold for sometimes.Our country is of burning a great deal of coal, and the problem of castoff produced in coal mining or combusting, such as coal ash or shale, is urgent to be resolved. Owing to some available rare elements such as Ga, Ge, V, U, Ni, Pt, etc, are consisted in these castoffs, the extracting and separating of these elements are recognized in some extent.In order to using the scrap resource adequately, changing the abandoned resource into the available material, protecting our environment and improving the economical benefit, the extracting and separating methods of Ga from ash or shale were discussed in this thesis.The contents in the thesis are:The extracting of Ga: Shale or ash as the sample, with the Orthogonal designation, the effects of the baking temperature and the baking time, the extracting temperature and time with acid on extracting efficiency of Ga from the samples, were studied. The result was that the optimum condition of the extract of Ga is: with 6 mol/L HC1 as the lixivium, the ratio between solid and liquid is 40:1, and the baking condition is different between shale and ash.The separation of Ga: According to the separating method of columniation chromatogram, the constant phase and the moving phase selection, the adsorption and desorption effect of Ga on adsorption system, and the most adsorption quantity of Ga were discussed in this thesis, so as to educe the optimum condition of the Ga separating. The silica gel's life and its reuse cycles, and the affection of coexisting ions on Ga separation were studied in this thesis, too.Analysis of Ga: In order to eliminate the disturbing of some elements on Ga analysis such as Fe(III), T1 (III) , Sb (V) , TiCl3 is used to reduce them into...