摘要:
对钛石膏理化性质进行了分析并开展了酸浸除杂单因素试验,研究了液固比、浸出时间、浸出液浓度、浸出温度、体系压力等因素对除杂效果的影响。试验结果表明,常压下的最佳反应条件为:液固比4、浸出时间45 min、浸出液浓度15%、浸出温度65℃,此时,Fe、Al、Mg的去除率分别为85%、56%、91%;当反应体系压力增加至2.0 MPa后,去除率得到进一步提升。矿物微观形貌分析发现,除杂后的钛石膏中硫酸钙晶型未发生明显变化;硫酸钙晶体表面附着的氢氧化铁得到有效去除。经过加压酸浸除杂后,钛石膏中Fe、Al、Mg的含量明显降低。
关键词:
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钛石膏 /
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酸浸 /
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除杂 /
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微观形貌
Abstract:
The physicochemical properties of titanium gypsum were analyzed and a single factor experimental study on acid leaching purification was carried out.The effects of liquid-solid ratio,leaching time,concentration of leaching solution,leaching temperature and system pressure on the purification of titanium gypsum were studied.The results show that the optimum reaction conditions under normal pressure is determined as the following:liquid-solid ratio of 4,leaching time of 45 min,concentration of leaching solution at 15%,and leaching temperature of 65 ℃,and the removal rate of iron,aluminum,and magnesium is about 85%,56% and 91%,respectively.When the pressure of the reaction system increases to 2.0 MPa,the removal rate is further improved.It is found by analyzing the mineral micro-morphology,that the crystal form of calcium sulfate in the titanium gypsum after purification is not changed significantly,and that the iron hydroxide attached to the surface of the calcium sulfate crystal is removed effectively.Meanwhile,the content of iron,aluminum,and magnesium in titanium gypsum is decreased significantly after pressurized purification.
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