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根据我国配合饲料对饲料级磷酸三钙的需求,提出发展饲料级脱氟磷酸三钙的生产工艺路线。推荐采用磷酸法生产脱氟磷酸三钙、回转窑一段烧结法生产饲料级磷酸三钙技术,并介绍该技术的生产工艺及物料消耗,为饲料级磷酸三钙生产提供参考。 相似文献
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以煤粉为燃料制取饲料级磷酸三钙单光渝(化工部上海化工研究院200062)磷酸盐是最主要的矿物饲料添加剂品种之一。全世界饲料磷酸盐的产量仅次于肥料和洗涤剂而居第三位,其重要性就不言而喻。目前,饲料磷酸盐的年生产能力(以P2O5计)为310万t,其中前苏... 相似文献
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磷酸氢二钠是一种用途广泛的化工原料,不仅用作人造丝填料,以增强丝的强度和弹性,还大量用来生产焦磷酸钠。同时也用于锅炉清洗、织物染色、木材、纸张防火等。高纯度的磷酸氢二钠可作为食品添加剂,成为比较理想的缓冲剂、 相似文献
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多孔磷酸三钙生物陶瓷的研制 总被引:12,自引:0,他引:12
本研究通过改变多孔磷酸三钙(PTCP)生物陶瓷的组成及制备工艺,制得了性能优良的PTCP生物陶瓷。采用TG-DTA、XRD、SEM、MTS陶瓷实验系统等现代测试技术对PTCP的微观结构、组成及性能进行了分析研究,并探讨了影响PTCP生物陶瓷的生物医学性能及物理性能的因素。 相似文献
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一种具有发展前景的饲料磷酸盐——脱氟磷酸三钙 总被引:3,自引:0,他引:3
脱氟磷酸三钙由于含钙量高、钙磷比适合于喂养家禽,是良好的饲料磷酸盐。它是由磷矿和其它添加物团粒,经高温焙烧后制成。具有工艺流程简单、生产成本低等优点。可结合本地情况,发展生产。 相似文献
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为降低硫酸和重钙粉消耗以及减少磷石膏排放,提出了浓磷酸分解磷矿制饲料级磷酸二氢钙(MCP)的新工艺。研究了工艺条件对磷矿分解率、磷矿中Ca利用率、硫酸节省率的影响。结果表明,优惠工艺条件为酸矿比为4~4.5、反应温度70~75℃、反应时间120~150 min,此时磷矿分解率60%,Ca利用率约10%,硫酸节省率约8%。将反应后的滤液结晶析出磷酸二氢钙,与重钙粉按照一定比例混合熟化即得饲料级磷酸二氢钙。XRD分析结果表明,产品中主要成分为Ca(H2PO4)2·H2O,产品符合GB/T 22548—2008要求。 相似文献
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《Ceramics International》2016,42(7):8263-8273
A machinable beta tricalcium phosphate [β-TCP, Ca3(PO4)2]-based composite has been produced by the classical ceramic sintering route by creating a weak interphase material of yttrium phosphate [YP, YPO4], from chemically synthesized and calcined β-TCP and up to 50 wt% YP powders. Sintered composites were characterized for phase constitution, densification and machinability (drilling) by using high-speed steel (HSS) and solid carbide (SC) drills in a conventional radial drilling machine. The effect of variation in drilling parameters (cutting speed and feed), cutting tool, batch composition on torque, thrust force and tool wear were studied. The biocompatibility of the sintered composites was also evaluated. It was found that with the increasing YP content the relative density of the composites decreased with an associated improvement in machinability with HSS and SC drills. Biocompatibility was also confirmed for the all the sintered composites. 相似文献
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Nano-sized amorphous tricalcium phosphate powders were synthesized through different mechanochemical reactions. The influence of milling parameters and chemical composition of reagents on the formation of amorphous tricalcium phosphate was investigated. In all the experiments, the mole ratio of calcium to phosphorous oxide was 3:1, i.e. the stoichiometric Ca/P content in the composition of amorphous tricalcium phosphate (Ca/P=1.5). Results revealed that the phase purity, structural features, and morphological characteristics of products were significantly influenced by the chemical composition of raw materials and milling parameters. For all the reactions, amorphous tricalcium phosphate was formed as the main product of mechanical activation after 10 h. After annealing at 1100 °C, crystallization of amorphous phase occurred, and consequently high crystalline β-tricalcium phosphate was generated. According to FT-IR findings, the synthesized powders had high chemical purity. After 10 h of milling, the obtained nanopowders through four distinct reactions exhibited crystallite sizes about 20, 69, 58 and 55 nm. The results from scanning electron micrographs showed that the mean size of agglomerate was in the range of 1–5 μm. Detailed study of morphological features by using transmission electron microscopy confirmed the formation of nano-sized amorphous tricalcium phosphate with spheroidal and ellipse-like morphologies. 相似文献
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为改进湿法磷酸生产工艺,提高副产石膏的品质,缓解湿法磷酸中固体副产物磷石膏带来的环保压力,进行了磷-硫两步法酸解磷矿制磷酸的研究。着重对贵阳某磷矿在磷酸中的浸出行为进行研究。结果表明,磷矿粒度小于75 μm、搅拌速度为500 r/min、反应温度为70 ℃、五氧化二磷质量分数为40%、反应时间为60 min时,磷矿分解率达到98.5%。德罗兹多夫动力学经验模型能够较好地描述40%五氧化二磷中磷矿反应速率的变化规律,且阻缓系数较大,表观活化能为6.048 kJ/mol,表明40%五氧化二磷中磷酸分解磷矿的反应速率受扩散控制。酸解渣SEM和EDS分析表明反应产物磷酸二氢钙结晶析出是影响扩散的主要因素。 相似文献
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医药级二水氯化钙工艺研究 总被引:1,自引:0,他引:1
以工业碳酸钙与工业盐酸为原料,经过反应、除杂、蒸发等工序,制备出医药级二水氯化钙。研究了各种因素对产品质量的影响,确定了较佳的工艺条件:除砷时溶液pH=4;活性炭吸附时间为1.5 h;除铁、镁、铝等时溶液pH=8.5;蒸发前溶液pH=4;蒸发温度为160℃。将基础无机化工原料生产成高质量、高附加值的医药级化工产品,工艺简单、成熟,效益好,利润高,工业化可行,既符合市场经济规律又符合中国化工产品向精细化、系列化的发展方向。 相似文献