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Öğe Carbothermic reduction of high-grade celestite ore to manufacture strontium carbonate(Inst Mining Metallurgy, 1998) Erdemoglu, M; Canbazoglu, M; Yalçin, HThe conversion of celestite (SrSO4) to strontium sulphide (SrS) by the carbothermic reduction process was investigated as a route for the production of SrCO3 from high-grade Turkish celestite ores. Experiments were conducted in the temperature range 900-1400 degrees C and metallurgical-grade coke was used as the reducing agent. The effects of reduction temperature, amount of carbon and roasting time were studied. The products of reaction (black ash) were examined, mainly with the use of X-ray diffraction and name atomic absorption spectrometry. The results include data on recoverable Sr obtained as strontium carbonate precipitate. The conversion reaction is complete at 1300 degrees C, and it begins at lower temperatures. In addition to sulphate-sulphide conversion, all alkali earth metals found in the ore can be transformed to carbides in the process of reduction, especially when the roasting time and amount of carbon added to concentrate are increased. The reduction reaction seems to be very fast and it is concluded that the manufacture of SrCO3 is feasible from the roasted product.Öğe The leaching of celestite in sodium sulfide solution to produce strontium carbonate(A A Balkema Publishers, 2000) Erdemoglu, M; Sarikaya, M; Canbazoglu, MThe leaching of celestite (SrSO4) with sodium sulfide (Na2S) solution was investigated from the point of strontium carbonate production. Experiments were carried out to explain the conversion mechanism of celestite to strontium disulfide (SrS2) in sodium sulfide solution. Leaching temperature was held constant and the effect of stirring rate, particle size and concentration of Na2S on the conversion of celestite were studied. The product from alkali leaching was leached with HCl to dissolve the leach product, strontium disulfide. Acidic leach liquid was, then, reacted with sodium carbonate solution to precipitate strontium carbonate. It was concluded that the conversion is based on the fact that a new compound having lower solubility is formed on the mineral surface in the system SrSO4, Na2S and H2O and that the rate of conversion mainly depends on the sodium sulfide concentration. The results showed that leaching of celestite in Na2S solution for conversion to strontium disulfide and production of strontium carbonate by using this chemical are possible processes.Öğe Leaching of celestite with sodium sulfide(Taylor & Francis Inc, 2006) Erdemoglu, M; Sarkaya, M; Canbazoglu, MLeaching of celestite mineral, SrSO4 , with sodium sulfide, Na2S, was investigated from the point of strontium carbonate, SrCO3, production. Experiments were carried out to explain the conversion mechanism of celestite to strontium disulfide, SrS2, in Na2S solution. Effects of stirring speed, particle size, and concentration of Na2S on conversion were studied at constant temperature and solid-to-liquid ratio. The results showed that the rate of conversion mainly depends on Na2S concentration. It was concluded that leaching of celestite in Na2S solution for conversion to SrS2 is possible but slow.Öğe The leaching of SrS with water and the precipitation of SrCO3 from leach solution by different carbonating agents(Elsevier Science Bv, 1998) Erdemoglu, M; Canbazoglu, MThe leaching of strontium sulfide (SrS) with water was investigated, and a comparison of Na2CO3 with CO2 as a carbonating agent for the precipitation of SrCO3 from leach solution was done. The effects of variables for leaching-temperature, retention time and solid to liquid ratio, and the effects of variables for precipitation-carbonation time, temperature, amount of carbonating agent and addition of oxygen to carbon dioxide, were studied. It was concluded that leaching of strontium sulfide is mainly dependent on the solubility of strontium hydroxide; however, SrS decomposes easily in hot water to give the hydrosulfide and the hydroxide. As a carbonating agent, Na2CO3 provides higher precipitation rates and higher strontium recovery but low SrCO3 grade, whereas precipitation with CO2 gives a high purity of product which is sufficient for most of the uses of SrCO3. It was also found that oxygen, when used together with carbon dioxide in the carbonation column, increases the strontium recovery and decreases the carbonation time. (C) 1998 Elsevier Science B.V. All rights reserved.Öğe Production of SrCO3 by black ash process: Determination of reductive roasting parameters(A A Balkema, 1996) Erdemoglu, M; Canbazoglu, M[Abstract Not Available]
