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硝酸钙溶液自然循环低温预浓缩实验研究
引用本文:余林春,杜怀明,张峰榛,罗容珍,周刚.硝酸钙溶液自然循环低温预浓缩实验研究[J].四川理工学院学报(自然科学版),2013,26(2):25-27.
作者姓名:余林春  杜怀明  张峰榛  罗容珍  周刚
作者单位:1. 四川理工学院材料与化学工程学院,四川自贡,643000
2. 四川理工学院化学与制药工程学院,四川自贡,643000
基金项目:四川理工学院人才引进项目,四川省教育厅人文社科重点研究基地科研项目
摘    要:针对我国磷矿品位下降给硝酸磷肥的生产带来的困难,磷矿酸解液的结晶除钙面临巨大的挑战,采用低温热源实现酸解液的预浓缩是冷冻法结晶除钙应对磷矿品位不断下降并实现低位热能利用的有效举措。将自然循环系统应用于硝酸钙溶液的预浓缩,采用低温余热作为热源,维持进料在20℃~25℃之间蒸发浓缩,浓度在45%~55%之间变化,蒸发管内传热Nusselt数仍然可以保持在28.4~36.7,易于实现低温浓缩操作的连续化,适用于低温热源的利用,具有较大的工业开发价值。

关 键 词:硝酸磷肥  硝酸钙  自然循环  低温预浓缩  Nusselt数

Experimental Study on the Preconcentration of Calcium Nitrate Solution in Natural Circulation Under Low Temperature
YU Lin-chun , DU Huai-ming , ZHANG Feng-zhen , LUO Rong-zhen , ZHOU Gan.Experimental Study on the Preconcentration of Calcium Nitrate Solution in Natural Circulation Under Low Temperature[J].Journal of Sichuan University of Science & Engineering:Natural Science Editton,2013,26(2):25-27.
Authors:YU Lin-chun  DU Huai-ming  ZHANG Feng-zhen  LUO Rong-zhen  ZHOU Gan
Institution:YU Lin-chuna,DU Huai-minga,ZHANG Feng-zhena,LUO Rong-zhenb,ZHOU Gana(a.School of Material and Chemical Engineering;b.School of Chemical and Pharmacentical Engineering, Sichuan University of Science & Engineering,Zigong 643000,China)
Abstract:With the continuous decline in phosphate rock grade,the production of nitric-acid phosphate becomes difficult and the removal of calcium from nitric acid hydrolysis solution is faced with huge challenges.In response to the above and in order to make good use of low temperature heat energy,the pre-concentration of solution through low temperature heat source is an effective way to remove calcium.Applying the natural circulation system to the pre-concentration of calcium nitrate solution,using the low temperature waste heat as heat source,with the evaporation concentration of the feed being conducted under the temperature of 20℃-25℃ and the concentration being 45%-55%,(wt%) the inside tube's Nusselt number for evaporation can keep from 28.4 to 36.7.In this way,the continuous operation could be obtained and the low temperature waste heat can be made full use of,therefore it is of great value in industrial development.
Keywords:nitro-phosphates(NP)  calcium nitrate  natural circulation  pre-concentration under low temperature  Nusselt number
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