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1. 发明授权

US4019950A Crystals and their manufacture 失效
标题翻译：晶体及其制造
公开(公告)号：US4019950A
公开(公告)日：1977-04-26
申请号：US629800
申请日：1975-11-07
申请人： Derek Francis Croxall , Robert Christopher Kell , Robert Lambert
发明人： Derek Francis Croxall , Robert Christopher Kell , Robert Lambert
IPC分类号： C01G21/14 , C30B7/00 , B01J17/04
CPC分类号： C30B7/00 , C01G21/14 , C30B29/10 , Y10S117/902 , Y10S117/918
摘要： In a hydrothermal process for manufacturing crystals of metal carbonates, including single crystals of lead carbonate of the cerussite crystalline form, the nutrient material consists of a carbonate or basic carbonate of the said metal, the solvent medium consists of a 0.5 to 5.0 molar aqueous solution of an alkali metal bicarbonate, and the heating is carried out in an autoclave under controlled temperature conditions such that the exterior of the autoclave wall adjacent to the nutrient and the solvent medium in the vicinity thereof is maintained at 200.degree. C to 400.degree. C, and that the exterior of the autoclave wall adjacent to the region of the solvent medium remote from the nutrient is maintained at 170.degree. C to 315.degree. C and at a temperature from 5.degree. C to 150.degree. C lower than that of the exterior of the autoclave wall adjacent to the nutrient: a temperature gradient is thus produced in the solvent medium and crystalline metal carbonate is deposited in a region remote from the nutrient, as small crystals on the autoclave wall or as crystal growth on seeds.
摘要翻译：在用于制造金属碳酸盐晶体的水热法中，包括铈铈矿结晶形式的碳酸铅单晶，营养物质由所述金属的碳酸盐或碱式碳酸盐组成，溶剂介质由0.5至5.0摩尔的水溶液的碱金属碳酸氢盐，并且在受控温度条件下在高压釜中进行加热，使得与营养物相邻的高压釜壁的外部和其附近的溶剂介质保持在200℃至400℃，并且与远离营养物质的溶剂介质区域相邻的高压釜壁的外部保持在170℃至315℃，并且比在外部的温度低5℃至150℃ 与营养物相邻的高压釜壁：因此在溶剂介质中产生温度梯度，并且结晶金属碳酸盐沉积在远离螺母的区域中暴露于高压釜壁上的小晶体或晶体生长在种子上。

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