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    • 3. 发明授权
    • Process for the production of crystalline sodium disilicate in an
externally heated rotary kiln having temperature zones
    • 在具有温度区域的外部加热回转窑中生产结晶二硅酸钠的方法
    • US5308596A
    • 1994-05-03
    • US986983
    • 1992-12-08
    • Michael KotzianGunther SchimmelAlexander TapperKnut Bauer
    • Michael KotzianGunther SchimmelAlexander TapperKnut Bauer
    • C01B33/32C01B33/38
    • C01B33/38
    • To prepare crystalline sodium disilicates having a laminar structure, a molar ratio of SiO.sub.2 to Na.sub.2 O of (1.9 to 2.1) 1 and a water content of less than 0.3% by weight, a water glass solution is first obtained by reacting sand with sodium hydroxide solution in a molar ratio of SiO.sub.2 to Na.sub.2 O of (2.0 to 2.3) : 1 at temperatures of 180.degree. to 240.degree. C. and pressures of 10 to 30 bar. This water glass solution having at least 20% by weight of solids is treated in a spray drier with hot air at 200.degree. to 300.degree. C. with the formation of a pulverulent amorphous sodium disilicate having a water content (determined as loss on heating at 700.degree. C.) of 15 to 23% by weight and a bulk density of at least 300 g/l. The spray-dried pulverulent, amorphous sodium disilicate is ground. The ground sodium disilicate is introduced into a rotary kiln equipped with devices for moving solids, externally heated via the wall and having in its interior a plurality of different temperature zones, and is treated therein at temperatures of 400.degree. to 800.degree. C. for 1 to 60 minutes with formation of crystalline sodium disilicate.
    • 为了制备具有层状结构,SiO 2与Na 2 O的摩尔比(1.9-2.1)1和含水量小于0.3重量%的结晶二硅酸钠,首先通过使沙子与氢氧化钠溶液 在180至240℃的温度和10至30巴的压力下,SiO 2与Na 2 O的摩尔比为(2.0至2.3):1。 具有至少20重量%固体的水玻璃溶液在喷雾干燥器中用200-300℃的热空气处理,形成具有水分含量的粉状无定形二硅酸钠(确定为在 700℃)为15〜23重量%,堆积密度为300g / l以上。 将喷雾干燥的粉状无定形二硅酸钠研磨。 将磨碎的二硅酸钠引入装备有用于移动固体的装置的回转窑,其外部经由壁加热并在其内部具有多个不同的温度区域,并在400℃至800℃的温度下处理1 至60分钟,形成结晶二硅酸钠。
    • 5. 发明授权
    • Process for purifying wet-processed phosphoric acid
    • 净化湿法磷酸的方法
    • US4596703A
    • 1986-06-24
    • US557111
    • 1983-12-01
    • Reinhard GradiGero HeymerGunther Schimmel
    • Reinhard GradiGero HeymerGunther Schimmel
    • C01B25/234C01B25/46C01B25/16C01B15/16C01B25/26
    • C01B25/461C01B25/462
    • The disclosure relates to a process for purifying crude, concentrated wet-processed phosphoric acid. To this end, the disclosure provides:(a) for the organic solvent to be mixed with the starting product in a ratio by volume of more than 4:1 to effect the extraction in a single process step--from the crude wet-processed phosphoric acid--of a quantity of phosphoric acid necessary for 40 to 70 weight % of the P.sub.2 O.sub.5 used to go into the organic phase, and for the resulting aqueous phosphoric acid raffinate to contain at most 28-32 weight % P.sub.2 O.sub.5, and for the organic phosphoric acid solution to be separated from the phosphoric acid raffinate;(b) for the separated organic phosphoric acid solution to be scrubbed with a quantity of scrubbing solution corresponding at most to 5% of the volume of the phosphoric acid solution; for the scrubbing solution to be recycled into stage (a), and for purified phosphoric acid and phosphate salt solution, respectively, to be recovered in known manner from the scrubbed phosphoric acid solution; and(c) for the aqueous phosphoric acid raffinate produced in stage (a), if desired after prior removal of residual solvent therefrom, to be directly utilized or subjected to known purifying treatment.
    • 本公开涉及纯化粗浓缩湿法磷酸的方法。 为此,本公开内容提供:(a)使有机溶剂与起始产物以体积比大于4:1的比例混合以在单一工艺步骤中进行萃取,从粗制湿法磷酸 酸为一定量的磷酸,用于进入有机相中的40〜70重量%的P2O5,所得到的磷酸提取液含有最多28-32重量%的P2O5,对于有机磷酸 酸性溶液与磷酸提余液分离; (b)对于待洗涤的分离的有机磷酸溶液,其量为相当于磷酸溶液体积的至多5%的洗涤溶液; 将洗涤溶液再循环到阶段(a)中,分别用纯化的磷酸和磷酸盐溶液从已洗涤的磷酸溶液中以已知方式回收; 和(c)如果需要,在步骤(a)中制备的磷酸残液水溶液中,在预先除去残余溶剂之后,直接使用或进行已知的纯化处理。