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复合金属材料在氯化钙生产中的应用
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作者 薛旺 张玉义 《纯碱工业》 CAS 2003年第6期37-38,共2页
针对常温加热蒸发工艺生产氯化钙产品质量差的问题,提出采用复合金属材料解决成品锅两面腐蚀因素不同的问题是提高产量质量、增加企业市场竞争力的有效方法。
关键词 复合金属材料 氯化钙生产 腐蚀 产量 质量 纯碱生产 废液利用 氨碱法
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NaCl—CaCl_2体系水溶液蒸发浓缩过程中浓度变化与沸点关系的研究 被引量:1
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作者 刘美云 袁建军 +2 位作者 马茜茜 段瑛锋 张焕菊 《盐业与化工》 CAS 2011年第4期24-26,28,共4页
氨碱法制碱过程中产生大量钙废液,废液中主要含有氯化钙、氯化钠等,将废液注井对硫酸钠型盐矿水溶采卤,可以实现井下脱硫生产液体盐或通过真空制盐生产精制盐产品。文章对NaC l—CaC l2体系水溶液蒸发浓缩过程中浓度及沸点变化进行了研... 氨碱法制碱过程中产生大量钙废液,废液中主要含有氯化钙、氯化钠等,将废液注井对硫酸钠型盐矿水溶采卤,可以实现井下脱硫生产液体盐或通过真空制盐生产精制盐产品。文章对NaC l—CaC l2体系水溶液蒸发浓缩过程中浓度及沸点变化进行了研究,为该工艺的工业生产状态下的操作条件的确定提供了数据支持,为实现制碱废液的有效利用和精制盐的提取创造了有利条件。 展开更多
关键词 氨碱废液 氯化钙生产 沸点
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Preparation of titanium powders by calciothermic reduction of titanium dioxide 被引量:6
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作者 万贺利 徐宝强 +3 位作者 戴永年 杨斌 刘大春 森维 《Journal of Central South University》 SCIE EI CAS 2012年第9期2434-2439,共6页
To develop an effective process for titanium powders production, a calciothermic reduction process of pigment titanium dioxide (w(TiO2)〉98%), based on the preform reduction process (PRP), was investigated by me... To develop an effective process for titanium powders production, a calciothermic reduction process of pigment titanium dioxide (w(TiO2)〉98%), based on the preform reduction process (PRP), was investigated by means of XRD, SEM and EDS. In this process, the mixture of TiO2 powder and CaC12 was pressed into pieces as feed preform and was reduced by calcium vapor. Titanium powders was recovered after leaching from the reduced preform with hydrochloric acid and deionized water. The results indicate when the mass ratio of CaC12 to TiO2 is about 1:4 and at a constant temperature of 1 273 K for 6 h in vacuum furnace, titanium powders with 99.55% purity by EDS analysis and irregular shape (8-15 μm in particle size) are obtained. 展开更多
关键词 titanium powders titanium dioxide calciothermic reduction calcium chloride
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Simultaneous Extraction of Phosphorus, Potassium, Calcium and Magnesium from Soils and Potassium Recommendations for Crops in Southern Brazil 被引量:2
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作者 L.BORTOLON C.GIANELLO +2 位作者 S.WELTER R.G.O.ALMEIDA E.GIASSON 《Pedosphere》 SCIE CAS CSCD 2011年第3期365-372,共8页
Simultaneous multi-element extraction has been increasing worldwide to improve soil laboratory testing quality and efficiency. This study sought to investigate the applicability of the Mehlich-1, Mehlich-3, and resin ... Simultaneous multi-element extraction has been increasing worldwide to improve soil laboratory testing quality and efficiency. This study sought to investigate the applicability of the Mehlich-1, Mehlich-3, and resin methods for simultaneous extraction of soil available P, K, Ca, and Mg as well as the effect of using conversion equations on nutrient recommendations for crops. Topsoil (0-20 cm) samples were taken from the most representative soil types used for crop production in southern Brazil with a wide range of chemical, physical, and mineralogical properties. Soil P, K, Ca, and Mg were simultaneously extracted using 1.0 mol L-1 KCl, Mehlich-1 and Mehlich-3 solutions, and membrane resin. The amounts of P extracted with the Mehlich-1 method were, on average, 50% lower than those extracted with the resin and Mehlich-3 methods. However, the resin method extracted the lowest amounts of K, Ca, and Mg. The use of conversion equations was suitable and it did not affect negatively the K recommendations for crops grown on soils of southern Brazil. 展开更多
关键词 Mehlich-1 Mehlcih-3 membrane resin multi-element extraction soil testing
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