共查询到18条相似文献,搜索用时 125 毫秒
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介绍云南云天化股份有限公司溶剂萃取法生产磷酸二氢钾技术发展概况,以及技术原理、工艺流程、技术特点、产品及副产品质量、成本估算。该技术以湿法磷酸、氯化钾和氨气为原料,采用溶剂萃取法工艺生产磷酸二氢钾产品,同时副产磷钾肥和氯化铵,具有非常明显的成本竞争优势。 相似文献
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阐述了磷酸二氢钾(KDP)的主要生产技术(中和法、直接法、结晶法、复分解法、离子交换法、电渗析法及萃取法);并认为用湿法磷酸代替热法磷酸是有利的。 相似文献
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研究了以普钙和硫酸钾为原料制备磷酸二氢钾的工艺条件。普钙厂联产磷酸二氢钾的最佳工艺条件为:普钙与水投料比为1∶2.5~3,反应温度为20℃~60℃,反应时间为120 m in,除杂pH值控制在5.5~6。 相似文献
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本文研制了一种以热法磷酸、氯化钾、碳酸氢铵制备磷酸二氢钾的新工艺,讨论了影响产品质量的因素,提出了适宜的工艺条件,为生产饲料级磷酸二氢钾提供了一条切实可行的技术路线。 相似文献
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为了提高磷酸二氢钾的纯度、白度以及透明度,在以钙水为原料生产磷酸二氢钾过程中,采用活性炭脱色,调节母液pH脱除Ca2+,加入BaCl2饱和溶液脱除SO24-。结果表明,磷酸二氢钾粗母液中加3.5g/100mL活性炭脱色,经过滤后用KOH饱和溶液调节pH至6.0左右,然后按n(BaCl2)/n(SO24-)=1.0加入BaCl2饱和溶液脱除SO24-,在净化过程中磷和钾有少量损失,Ca2+、SO24-脱除效果较好,并且对其它金属阳离子也有一定的脱除效果。净化母液经蒸发、结晶后得到的磷酸二氢钾产品达到国家工业级一等品标准。 相似文献
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Calcite flotation in acidic media is a difficult task due to the solubility of calcite and consequently the release of calcium ions in the flotation pulp. In addition, the interaction of calcium ions with the flotation reagents requires the correct selection of these reagents. In this study, potassium oleate and potassium dihydrogen phosphate (KH2PO4) were used as collector and depressant, respectively. Micro‐flotation experiments were conducted to probe the effect of these chemical reagents as well as their interaction on calcite flotation using H2SO4 as a pH regulator. In addition, to elucidate the depressing action of KH2PO4 on calcite, electrokinetic properties of calcite have been measured in relation to pH and in the absence and presence of KH2PO4. Moreover, thermodynamic calculations were used to rationalize the reasons for calcite depression as well as the adsorption mechanism of KH2PO4 onto the calcite surface. 相似文献