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磷石膏是湿法生产磷酸时排放出的固体废物,每生产1t磷酸约产生4.5~5t的磷石膏。据统计,目前国内堆存的磷石膏超过1.2亿t,仅利用磷石膏生产硫酸铵肥料,每年消耗磷石膏固态废渣60多万t的同时,排放了30万t碳酸钙废渣。碳酸钙渣中杂质含量比较高,准确检测碳酸钙渣中CaCO3的表观分解率,为水泥行业利用碳酸钙渣创造条件。1碳酸钙渣的主要成分对试样进行X射线衍射分析,所用仪器为日本D/MAX2200型X射线衍射仪(Cu靶,扫描速率10°/min,2θ角度5~70°)。XRD定性检测见图1。有少量的
Phosphogypsum is a solid waste discharged during the wet process of phosphoric acid production, producing about 4.5 to 5 tons of phosphogypsum per 1 ton of phosphoric acid. According to statistics, at present, more than 120 million tons of phosphogypsum are stored in the country, and ammonium sulfate fertilizers are only produced by utilizing phosphogypsum, which consumes more than 600,000 tons of phosphogypsum solid waste residues each year and releases 300,000 tons of calcium carbonate waste residues. The content of impurities in calcium carbonate slag is relatively high, and the apparent decomposition rate of CaCO3 in calcium carbonate slag is accurately detected, thereby creating conditions for the use of calcium carbonate residue in the cement industry. 1 The main components of calcium carbonate slag X-ray diffraction analysis of the sample, the instrument used for the Japanese D / MAX2200 X-ray diffractometer (Cu target, the scanning rate of 10 ° / min, 2θ angle of 5 to 70 °). XRD qualitative test shown in Figure 1. There are a few