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1. 发明授权

US4271131A Production of highly pure lithium chloride from impure brines 失效
标题翻译：从不纯的盐水生产高纯氯化锂
公开(公告)号：US4271131A
公开(公告)日：1981-06-02
申请号：US28973
申请日：1979-04-11
申请人： Patrick M. Brown , Susan R. Jacob , Daniel A. Boryta
发明人： Patrick M. Brown , Susan R. Jacob , Daniel A. Boryta
IPC分类号： C01D15/04
CPC分类号： C01D15/04 , Y02P20/125 , Y02P20/134 , Y10S159/903
摘要： Highly pure lithium chloride suitable for use in production of lithium metal by electrolysis is obtained directly from impure natural or other lithium chloride brines by an integrated process in which the brine is first concentrated by solar energy to a lithium chloride concentration of about 3%, after which the brine is treated with lime and calcium chloride to convert such impurities as boron, magnesium and sulfate to a calcium borate hydrate, magnesium hydroxide and calcium sulfate dihydrate, respectively, and separating the precipitated calcium sulfate dihydrate from the brine. The brine is then further concentrated to 40% or more lithium chloride by means of solar or other energy, during which concentration step the calcium borate hydrate, magnesium hydroxide and calcium sulfate dihydrate precipitate from the brine. The highly concentrated brine is subjected to evaporation at a temperature above 101.degree. C. to produce anhydrous lithium chloride which is further heated to a temperature of 200.degree. C. or more, followed by extraction of the lithium chloride with isopropanol. After removal of solvent a highly pure lithium chloride product is obtained.
摘要翻译：适用于通过电解生产锂金属的高纯度氯化锂通过一体化方法直接从不纯的天然或其他氯化锂盐水中获得，其中盐水首先通过太阳能浓缩至约3％的氯化锂浓度，之后其中盐水用石灰和氯化钙处理以分别将诸如硼，镁和硫酸盐的杂质转化成硼酸钙水合物，氢氧化镁和硫酸钙二水合物，并将沉淀的硫酸钙二水合物与盐水分离。然后通过太阳能或其他能量将盐水进一步浓缩至40％以上的氯化锂，在此期间，浓缩步骤中，硼酸钙水合物，氢氧化镁和硫酸钙二水合物从盐水中沉淀出来。将高浓度的盐水在高于101℃的温度下进行蒸发以制备无水氯化锂，将其进一步加热到200℃或更高的温度，然后用异丙醇萃取氯化锂。除去溶剂后，得到高纯度的氯化锂产物。

2. 发明授权

US4274834A Process for purification of lithium chloride 失效
标题翻译：氯化锂的净化方法
公开(公告)号：US4274834A
公开(公告)日：1981-06-23
申请号：US28974
申请日：1979-04-11
申请人： Patrick M. Brown , Susan R. Jacob
发明人： Patrick M. Brown , Susan R. Jacob
IPC分类号： C01D15/04 , C01D3/08 , C01D15/02
CPC分类号： C01D15/04
摘要： Lithium chloride containing small amounts of inorganic and/or organic impurities is purified by heating the lithium chloride above about 200.degree. C., cooling the compound to ambient temperatures and extracting it with isopropanol, separating the liquid and solid phases, removing the isopropanol and recovering lithium chloride of high purity.
摘要翻译：含有少量无机和/或有机杂质的氯化锂通过将氯化锂加热至约200℃进行纯化，将化合物冷却至环境温度，并用异丙醇萃取，分离液相和固相，除去异丙醇并回收高纯氯化锂。

3. 发明授权

US4126666A Process for producing high purity lithium sulfide 失效
标题翻译：生产高纯度硫酸锂的方法
公开(公告)号：US4126666A
公开(公告)日：1978-11-21
申请号：US872310
申请日：1978-01-25
申请人： Susan R. Jacob , Patrick M. Brown
发明人： Susan R. Jacob , Patrick M. Brown
IPC分类号： C01B17/22 , C01D15/00
CPC分类号： C01B17/22 , C01P2004/03 , C01P2004/50 , C01P2006/20 , C01P2006/80
摘要： Lithium sulfide in the form of a finely divided, free-flowing powder of high purity is produced by reacting lithium carbonate powder in which the diameter of the particles is in the range of 1 to 10 microns with hydrogen sulfide at 500.degree. to 700.degree. C. Initial contact of the lithium carbonate with hydrogen sulfide takes place at a temperature substantially below the sintering temperature of lithium carbonate which is approximately 300.degree. to 400.degree. C.

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