磷石膏脱硫钙渣浸取液中杂质对碳酸钙晶型的影响
发布时间：2018-08-13 18:20
【摘要】：磷石膏脱硫钙渣是磷石膏化学分解后产生的以氧化钙为主要成分的尾渣。以氯化铵溶液浸取磷石膏脱硫钙渣并碳化浸取液以制备轻质碳酸钙是一种有效利用磷石膏脱硫钙渣中钙资源的方法。本文分析了该方法在不同氯化铵浓度下浸取液的组成、钙浸出率及pH,同时为了研究浸取液中NH_4~+、铁、铝、镁等对产品碳酸钙晶型的影响,配制了含有杂质离子的NH_4Cl~ NH_3·H_2O溶液,比较了其碳化产品与相同条件下脱硫钙渣碳化产品的晶型差异。结果表明,随氯化铵浓度升高,浸取液pH降低,铝含量降低,铁、镁含量升高。在氯化铵浓度范围内,NH_4~+对球霰石形成有促进作用,而铁、镁杂质对方解石形成有促进作用,由于铝离子存在形态不同,铝在1mol/L时对形成球霰石有促进作用,在大于1mol/L时对形成方解石有促进作用。当氯化铵浓度小于4mol/L时,各种杂质相互作用形成球霰石晶型,氯化铵浓度等于4mol/L时,各种杂质相互作用形成球霰石和方解石混合晶型。
[Abstract]:Phosphogypsum desulphurization calcium slag is a kind of residue produced by chemical decomposition of phosphogypsum with calcium oxide as the main component. The preparation of light calcium carbonate by leaching phosphogypsum desulphurization calcium slag with ammonium chloride solution and carbonization leaching solution is an effective method to utilize calcium resources in phosphogypsum desulphurization calcium slag. In this paper, the composition, calcium leaching rate and pH of the leaching solution under different ammonium chloride concentrations were analyzed. In order to study the effects of NH _ 4cl ~, Fe, Al, mg on the crystal form of calcium carbonate, the NH_3 H _ 2O solution containing impurity ions was prepared. The crystal structure of the carbonized product was compared with that of the calcium slag carbonized product under the same conditions. The results showed that with the increase of ammonium chloride concentration, pH decreased, aluminum content decreased, iron and magnesium content increased. In the concentration range of ammonium chloride, NH _ 4 ~ can promote the formation of vermicelli, while iron and magnesium impurity can promote the formation of calcite. Because of the different forms of aluminum ions, aluminum can promote the formation of vaterite in 1mol/L. The calcite formation is promoted when 1mol/L is greater than. When the concentration of ammonium chloride is less than 4mol/L, various impurity interactions form the crystal form of vaterite. When the concentration of ammonium chloride is equal to that of 4mol/L, the mixed crystal form of vaterite and calcite is formed by the interaction of various impurity.
【作者单位】： 四川大学化学工程学院;
【分类号】：TQ09
本文编号：2181800
[Abstract]:Phosphogypsum desulphurization calcium slag is a kind of residue produced by chemical decomposition of phosphogypsum with calcium oxide as the main component. The preparation of light calcium carbonate by leaching phosphogypsum desulphurization calcium slag with ammonium chloride solution and carbonization leaching solution is an effective method to utilize calcium resources in phosphogypsum desulphurization calcium slag. In this paper, the composition, calcium leaching rate and pH of the leaching solution under different ammonium chloride concentrations were analyzed. In order to study the effects of NH _ 4cl ~, Fe, Al, mg on the crystal form of calcium carbonate, the NH_3 H _ 2O solution containing impurity ions was prepared. The crystal structure of the carbonized product was compared with that of the calcium slag carbonized product under the same conditions. The results showed that with the increase of ammonium chloride concentration, pH decreased, aluminum content decreased, iron and magnesium content increased. In the concentration range of ammonium chloride, NH _ 4 ~ can promote the formation of vermicelli, while iron and magnesium impurity can promote the formation of calcite. Because of the different forms of aluminum ions, aluminum can promote the formation of vaterite in 1mol/L. The calcite formation is promoted when 1mol/L is greater than. When the concentration of ammonium chloride is less than 4mol/L, various impurity interactions form the crystal form of vaterite. When the concentration of ammonium chloride is equal to that of 4mol/L, the mixed crystal form of vaterite and calcite is formed by the interaction of various impurity.
【作者单位】： 四川大学化学工程学院;
【分类号】：TQ09
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