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通过模拟湿法磷酸实际生产过程中萃取工艺条件,研究了磷酸料浆液固质量比、稀磷酸浓度、料浆温度及真空度对料浆过滤强度的影响。结果表明:液固质量比对料浆的过滤效率无较大影响,稀磷酸浓度、料浆温度和真空度对过滤强度有较大影响,在稀磷酸w(P_2O_5)为24%、料浆温度为80℃时,料浆的过滤强度最大,而真空度可在保证生产能力的条件下选择最大值。 相似文献
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本文通过模拟湿法磷酸生产中磷酸料浆真空过滤的过程,研究磷酸料浆在不同温度及不同真空度下磷酸料浆的温度下降和磷酸料浆水分蒸发量。结果表明:真空过滤时真空度越高,磷酸料浆的温度下降越大,结垢越多。料浆过滤真空度保持在0.056-0.057MPa比较适宜。 相似文献
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分析了半水-二水法再结晶浓磷酸生产工艺流程中过滤系统目前存在的问题,并从滤饼洗涤水的加入方式、过滤真空度控制及工艺管道结垢清理等操作方式进行优化。优化措施实施后,装置运行更加平稳,过滤系统的料浆过滤和洗涤效率得到显著提升,装置总磷收率由95%提高至98%以上。 相似文献
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在解过滤偏微分方程的基础上导出了滤饼孔隙率分布,对影响孔隙率分布的因素进行了讨论,指出恒压过滤时滤饼孔隙率分布不仅与物料的可压缩性有关,还与料浆浓度及操作条件有关,孔隙率分布的实测结果与理论预测值吻合较好。 相似文献
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采用响应曲面法的中心组合设计原理,建立浸出温度、硫酸浓度及液固比及三者之间交互作用对选择性浸出率与矿浆过滤速率的多元二次回归方程,并使用自适应权重粒子群算法对铜冶炼渣氧压硫酸选择性浸出工艺进行多目标优化。结果表明:浸出温度、硫酸浓度和液固比均是影响浸出率和过滤速率的主要因素,各响应因素间存在交互效应,且选择性浸出率与矿浆过滤速率在最佳条件上存在差异。优化后的选择性浸出率和矿浆过滤速率最佳的工艺条件为:温度为204.1℃、硫酸浓度为0.46mol/L、液固比为6.9mL/g,此条件下选择性浸出率为96.95%,过滤速率为399.42L/(m2?h),与验证实验中平均选择性浸出率、平均过滤速率分别为96.57%,398L/(m2?h)相比,偏差较小,预测值与验证实际值吻合好,表明模型选择准确,优化方案可信。 相似文献
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Heekyu Choi Ochirhuyag Bayanjargal JunIchiro Tsubaki Takamasa Mori Tadamitsu Sugimoto JungEun Lee 《Korean Journal of Chemical Engineering》2008,25(5):1165-1169
A cake-less continuous filtration equipment has been developed based on an evaluation of inorganic powder slurry characteristics
by many kinds of measurement methods, such as a sedimentation test under gravity and a hydrostatic pressure test. We have
been developing a high-performance cake-less filtration system in which a condensed inorganic powder slurry layer maintains
its fluidity. The development of this novel filtration system has allowed us to cease the scraping operation of the cake as
well as to collect the highly condensed slurry more easily. These results clearly show that a new device may be realized for
the deposition of highly condensed, fluid slurries. It is confirmed that the concentration of the condensed slurry amounted
to 35 vol% while still retaining fluidity. The specifications of our new filtration system and its operation conditions for
scale-up can be determined by theoretical methods. There is good potential for successfully collecting high condensation slurry
more easily in a multiple filter system. 相似文献
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本文对过滤过程悬浮液的平均浓度和瞬时浓度进行理论分析,并推导出相应的计算公式;同时,介绍一种测定瞬时浓度的实验方法.结果表明,通常情况下,采用通气搅拌、机械搅拌和循环流动三种恒浓度方法中的一种或两种,即能保证悬浮液浓度在过滤过程中基本上维持恒定. 相似文献
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The effect of some influencing parameters such as temperature, initial concentration of flusilicic acid, rate of addition of Al(OH)3 powder, agitation speed and aging time of slurry and their mixed effects on the filtration rate of silica precipitates have been investigated. Moreover, a suitable model is presented to describe the formation mechanism of aggregated silica precipitates which can well explain the effect of different factors on the filtration rate of the silica precipitates. 相似文献
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《Desalination》1987
A tubular filter press process using fabric tubes has been developed to dewater the sludge resulting from the clarification of raw water.A prototype plant, designed to dewater the sludge resulting from the treatment of 30 Ml/day of surface water, has been constructed by a water authority.The slurry is fed under pressure into an array of porous tubes, the liquid in the slurry filters through the tube walls while the slurry solids are deposited as a thin layer on the internal walls of the tubes. The cake is dislodged periodically from the tube walls and transported hydraulically out of the tubes where it is drained and conveyed to a collection hopper.The raw dam water associated with the prototype unit is clarified using a polyelectrolyte/bentonite mixture. The resultant sludge has a mean solids concentration of 23 g/l. The prototype tubular filter press has produced on average a cake with a solids concentration of 32% mass/mass and a filtrate with a suspended solids of 57 mg/l. The process operates with minimum supervision and no chemical addition. The solids dewatering capacity for a feed solids concentration of 23 g/l and operating at a pressure of 400 kPa is 1.5 kg dry solids/m2h. The performance of the unit can be described using standard filtration theory modified for a circular filtration surface.The performance to date indicates that this process compares favourably with other commercially available sludge dewatering methods. 相似文献
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针对现有氢氧化镁阻燃剂在制备过程中存在氢氧化镁浆料过滤性能差的问题,采用正向沉淀法,以六水氯化镁和氢氧化钠为原料,在制备氢氧化镁的过程中加入硅藻土和油酸,制备出了硅藻土基表面有机化氢氧化镁。通过过滤性能测试考察了硅藻土添加量对氢氧化镁浆料过滤性能的影响,同时采用全自动比表面及孔径分析仪(BET)、场发射扫描电子显微镜(FESEM)、傅里叶红外光谱仪(FTIR)、同步热分析仪(STA)等对产物进行了分析。过滤性能和BET分析表明,添加硅藻土后,氢氧化镁浆料的过滤速率明显提高,当硅藻土与氢氧化镁质量比为0.10∶1时,所制备的硅藻土基表面有机化氢氧化镁的孔容最大,且氢氧化镁浆料的过滤性能提高了61.9%;FESEM分析表明,硅藻土的表面负载了分散性较好的片状氢氧化镁;FTIR分析表明,油酸成功地结合在氢氧化镁和硅藻土表面,提高了硅藻土基氢氧化镁的疏水性;热重(TG)分析表明,硅藻土对氢氧化镁具有协同阻燃效应,少量硅藻土的加入可以提高氢氧化镁的热稳定性,提高残重率,降低热释放速率,延长热分解时间。 相似文献
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