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1. 发明授权

US4405575A Method of defluorinating phosphates 失效
标题翻译：氟化磷酸盐的方法
公开(公告)号：US4405575A
公开(公告)日：1983-09-20
申请号：US371333
申请日：1982-04-23
申请人： Albert E. Henderson
发明人： Albert E. Henderson
IPC分类号： A23K1/175 , C01B25/32 , C05B1/00 , C01F1/00 , C01B25/16 , C01F5/00 , C05B11/04
CPC分类号： C01B25/328 , A23K20/26 , C05B1/00 , Y10S71/03
摘要： This invention comprises a method for removing fluorine from natural phosphates, superphosphate materials and wet process phosphoric acids starting materials comprising(a) admixing rock phosphate having a fluorine content above that desired with an acid mixture within the range of rock:acid mixture of about 0.8 to 1 and 1:1.4 by weight;(b) said acid mixture being substantially concentrated phosphoric acid and concentrated sulfuric acid in a range of phosphoric:sulfuric of about 1:1 to 5:1 by weight;(c) said admixing being at a temperature in the range of 215.degree. to 265.degree. F. while adding water in an amount of up to about 12% by weight of the total mixture and then subjecting the above charge;(d) in a first heating stage adding (1) recycle in an amount substantially of recycle to charge of 1:1 to 10:1 by weight (2) and water while heating to a temperature in the range of 300.degree. F. to 400.degree. F. for a period of time up to about 6 minutes;(e) and in a second heating stage, maintaining the temperature in the range of 400.degree. to 600.degree. F. for a period of time of up to about 6 mimutes, and then;(f) quickly cooling the resulting product above to a temperature range below about 300.degree. F. to 200.degree. F. while neutralizing to about 1 to 6% free acid and with addition of at least sufficient amount of water to have water of hydration of substantially 2 to 9% by weight in the final product;(g) and, crushing the above resulting product to a desired granular size and separating and returning smaller fine particles as recycle.
摘要翻译：本发明包括从天然磷酸盐，过磷酸盐材料和湿法磷酸起始材料中除去氟的方法，其包括（a）将具有高于所需值的氟含量的磷酸盐与酸混合物混合在约0.8的岩石：酸混合物的范围内至1和1：1.4; （b）所述酸混合物是基本浓缩的磷酸和浓硫酸的重量比为约1：1至5：1的磷酸：硫酸; （c）所述混合物在215-265°F的温度范围内，同时加入最多达总混合物重量的约12％的水，然后对上述电荷进行处理; （d）在第一加热阶段中，加入（1）基本上循环量为1:1至10:1（重量）和水的循环量，同时加热到300°F的温度至 400°F，时间长达约6分钟; （e），在第二加热阶段，将温度保持在400〜600°F的范围内，时间可达6乇左右。（f）将所得产物快速冷却至低于约300°F至200°F的温度范围，同时中和至约1至6％游离酸，并加入至少足够量的水以使水合水在最终产品中基本上为2至9重量％（g），并将上述所得产物粉碎成所需的颗粒尺寸，并分离和返回较小的微粒作为再循环。

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