共查询到20条相似文献,搜索用时 46 毫秒
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磷酸是一种重要的化工原料,其用途十分广泛。使用传统硫酸法会产生大量磷石膏,磷石膏在利用方面缺乏较为完整成熟的技术,磷石膏利用率较低,容易造成环境污染,给企业带来成本压力。并且硫酸法对磷矿品位有一定要求,相比之下盐酸法具有其独特优势。盐酸法粗磷酸中主要成分是磷酸和氯化钙,氯化钙的去除技术和综合利用是影响盐酸法大规模工业应用的关键所在。介绍了萃取法、三聚氰胺法、离子交换法、液膜法去除氯化钙技术以及氯化钙废液的综合利用现状,针对盐酸法工艺存在的问题提出了建议。指出经济、高效地去除盐酸法粗磷酸中的氯化钙以及对其有效利用是盐酸法湿法磷酸工艺推广应用的关键。 相似文献
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副产盐酸分解白云石制轻质氧化镁和氯化钙研究 总被引:3,自引:0,他引:3
介绍了以白云石为原料制备轻质氧化镁和氯化钙的基本原理和工艺流程,用工业副产盐酸分解白云石粉,直接加入白云石煅粉分离钙,以白云石灰作沉淀剂,控制反应条件,保留晶种循环,得到了具有一定粉度、易分离的氢氧化镁沉淀,经烘干、灼烧制得的轻质氧化镁达到GB优级品标准,由富钙液制得的氯化钙纯度在97%以上。具有较显著的经济效益。 相似文献
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利用含有机杂质的副啼稀盐酸和方解石进行中和反应,溶液经脱色、除杂后制得无水氯化钙产品,指标达到产品标准要求,为副产稀盐酸开拓了一个新的利用途径。 相似文献
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为解决硼泥带来的环境污染问题,充分利用其中的镁元素制备镁盐和其他镁化工产品,进行了硼泥的盐酸浸出实验研究。首先采取煅烧的方式对硼泥活化预处理,研究了煅烧温度、煅烧时间对工艺的影响,得到适宜的煅烧工艺条件:煅烧温度为600 ℃、煅烧时间为2 h;在盐酸浸出硼泥工艺过程中,研究了盐酸用量、酸浸温度、酸浸时间对硼泥中氧化镁浸出率的影响,得到适宜的酸浸工艺条件:盐酸用量为2.5 mL/g、酸浸温度为95 ℃、酸浸时间为1 h,在此条件下氧化镁的浸出率达到95.8%。硼泥浸出渣的XRD测试表明,硼泥主要含有的镁物相镁橄榄石和菱镁矿已被完全浸出。 相似文献
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ZHANYI Y. WANG MARTIN P. HARMER YE T. CHOU 《Journal of the American Ceramic Society》1986,69(10):735-740
A high-angle tilt boundary of LiF with attached pores was made to migrate under the influence of temperature and an imposed boundary curvature. The boundary was fractured along the boundary plane to observe its leading and trailing faces by stereo scanning electron microscopy. A detailed analysis of the attached pore shape and pore drag mechanism has been made. The quasi-equilibrium pore shape developed by pores detached from the boundary was used to determine the orientation dependence of surface energy in LiF. 相似文献
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Subramanium V. Raj J. Daniel Whittenberger 《Journal of the American Ceramic Society》1990,73(2):403-408
Constant-velocity compression tests were conducted at 800 K on as-cast LiF-22 mol% CaF2 hypereutectic salt with engineering strain rates varying between 1.8 × 10−6 and 2.3 × 10−1 s−1 . Considerable stain hardening was observed during the initial stages of deformation, and the true stress-strain curves exhibited maxima. Plots of the true strain rate against the flow stress at the proportional limit and the peak stress exhibited a power-law relation with stress exponents of 7.7. Microstructural examination of the deformed specimens showed extensive grain-boundary cracking and cavitation. These results suggest that grain-boundary cracking and interfacial sliding is important for cavity nucleation at the grain boundaries and at the LiF-CaF2 interfaces, and cavity growth and interlinkage, which appear to depend on the morphological differences between different grain boundaries, occur through the preferential failure of the weaker LiF phase. 相似文献
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废旧锂离子电池中含有大量的金属钴与锂,具有较高的回收利用价值。文章以废旧锂离子电池中的正极材料为原料,考察了正极材料中的钴和锂在氨基磺酸和过氧化氢混合体系中浸出的实验。运用单因素实验,研究了氨基磺酸浓度、过氧化氢质量分数以及固液比等条件对Co2+、Li+浸出效果的影响。实验结果表明,反应产物中有氨基磺酸钴生成,当氨基磺酸浓度为0.75 mol/L、过氧化氢质量分数为5 vol.%、温度为60℃、固液比为5 g/L、时间为2 h时,钴和锂的浸出率均超过98%。 相似文献
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Techniques for the fabrication of polycrystalline LiF test specimens were developed and evaluated using single-crystal LiF as a control. An etch was developed which revealed dislocations on all crystallographic faces of LiF. Large-grained polycrystalline specimens tested in four-point loading underwent 0.076 to 0.798% plastic strain before fracture. In most cases their yield stress was similar to that for single crystals favorably oriented for flow on {110}〈110〉 slip systems. Deformation was inhomogeneous among the grains because of differences in orientation with respect to the applied stress and within individual grains because of interactions at grain boundaries. Grain boundaries were barriers to slip, but stresses resulting from slip in one grain were transmitted to neighboring grains and often caused local deformation near the boundary. In one case, local boundary slip occurred on an (010) plane. Three-grain junctions were areas of high residual stresses, and fractures originated at boundaries at or near three-grain junctions. Fractures were mixed transgranular and intergranular. 相似文献