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1.发明授权Process for the production of crystalline sodium disilicate in an externally heated rotary kiln having temperature zones 失效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
公开(公告)号：US5308596A
公开(公告)日：1994-05-03
申请号：US986983
申请日：1992-12-08
CPC分类号： C01B33/38
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US5229095A
公开(公告)日：1993-07-20
申请号：US839008
申请日：1992-02-14
IPC分类号： C01B33/32
CPC分类号： C01B33/325 , C01B33/32
摘要： A process for producing amorphous sodium silicates having a water content of 0.3 to 6% by weight and an SiO.sub.2 /Na.sub.2 O molar ratio of (1.9 to 2.8) : 1 from a waterglass solution containing at least 20% by weight of solids, the water-glass solution is obtained by reacting quartz sand with sodium hydroxide solution at an SiO.sub.2 /Na.sub.2 O molar ratio of (2.0 to 2.8) : 1 at temperatures of 180 to 240.degree. C. and pressures of 10 to 30 bar. This waterglass solution is treated in a spray-drying zone with hot air at 200 to 300.degree. C. for a residence time of 10 to 20 seconds and at a temperature of the exit gas leaving the spray-drying zone of 90.degree. to 130.degree. C., to form a pulverulent amorphous sodium silicate having a water content (determined as the loss on ignition at 700.degree. C.) of 15 to 23% by weight and a bulk density of more than 300 g/l. The pulverulent sodium silicate is introduced into an obliquely arranged rotary kiln fitted with devices for moving solids and treated therein with flue gas in countercurrent at temperatures from 250.degree. up to 500.degree. C. for 1 to 60 minutes. The rotary kiln is here insulated in such a way that its outside wall temperature is less than 60.degree. C. Finally, the amorphous sodium silicate emerging from the rotary kiln is comminuted by means of a mechanical crusher to grain sizes of 0.1 to 12 mm.
摘要翻译： 从含有至少20重量％固体的水玻璃溶液制备水含量为0.3-6重量％和SiO 2 / Na 2 O摩尔比为（1.9至2.8）：1的无定形硅酸钠的方法， 通过在180-240℃的温度和10至30巴的压力下使石英砂与氢氧化钠溶液以（2.0至2.8）：1的SiO 2 / Na 2 O摩尔比反应获得玻璃溶液。 该水玻璃溶液在200〜300℃的热风喷雾干燥区中处理10〜20秒的停留时间，离开喷雾干燥区的出口气体的温度为90〜130℃ 以形成15〜23重量％的含水量（在700℃下测定为灼烧损失）的粉末状无定形硅酸钠，堆积密度大于300g / l。 将粉状硅酸钠引入倾斜布置的旋转窑中，该回转窑装有用于移动固体的装置，并在250℃至500℃的温度下逆流处理烟道气1至60分钟。 回转窑的外壁温度低于60℃，最后将回转窑出现的无定形硅酸钠粉碎成0.1〜12mm的粒径。
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3.发明授权
公开(公告)号：US5236682A
公开(公告)日：1993-08-17
申请号：US846758
申请日：1992-03-05
CPC分类号： C01B33/325 , C01B33/32 , C01B33/38
摘要： For producing crystalline sodium silicates having a layer structure, an SiO.sub.2 /Na.sub.2 O molar ratio of (1.9 to 2.1):1 and a water content of less than 0.3% by weight from a waterglass solution containing at least 20% by weight of solids, the waterglass solution is obtained by reacting quartz sand with sodium hydroxide solution at an SiO.sub.2 /Na.sub.2 O molar ratio of (2.0 to 2.3):1 at temperatures of 180.degree. to 240.degree. C. and pressures of 10 to 30 bar. This waterglass solution is treated in a spray-drying zone with hot air at 200.degree. to 300.degree. C. for a residence time of 10 to 25 seconds and at a temperature of the exit gas leaving the spray-drying zone of 90.degree. to 130.degree. C., to form a pulverulent amorphous sodium silicate having a water content (determined as the loss on ignition at 700.degree. C.) of 15 to 23% by weight and a bulk density of more than 300 g/l. The pulverulent, amorphous, water-containing sodium silicate is introduced into an obliquely arranged rotary kiln fitted with devices for moving solids and treated therein with flue gas in countercurrent at temperatures from more than 500.degree. up to 850.degree. C. for 1 to 60 minutes to form crystalline soidium silicate. The rotary kiln is here insulated in such a way that its outside wall temperature is less than 60.degree. C. Finally, the crystalline sodium silicate emerging from the rotary kiln is comminuted by means of a mechanical crusher to grain sizes of 0.1 to 12 mm.
摘要翻译： 为了生产具有层状结构的结晶硅酸钠，SiO 2 / Na 2 O摩尔比为（1.9-2.1）：1，水含量小于含有至少20重量％固体的水玻璃溶液的0.3重量％ 通过使SiO 2 / Na 2 O摩尔比为（2.0〜2.3）：1的石英砂与氢氧化钠溶液在180〜240℃的温度和10〜30巴的压力下反应获得水玻璃溶液。 该水玻璃溶液在200℃至300℃的热空气的喷雾干燥区中处理，停留时间为10至25秒，并且在离开喷雾干燥区的出口气体的温度为90°至130° 以形成具有15至23重量％的含水量（以700℃测定的点火损失确定）的粉末状无定形硅酸钠，堆积密度大于300g / l。 将粉末状，无定形含水硅酸钠引入倾斜布置的回转窑中，该回转窑装有固体移动装置，并在大于500℃至850℃的温度下逆流处理烟气1至60分钟 以形成硅酸的结晶硅酸盐。 回转窑的外壁温度低于60℃，最后将回转窑中出现的结晶硅酸钠粉碎成0.1〜12mm的粒度粉碎机。
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公开(公告)号：US5268156A
公开(公告)日：1993-12-07
申请号：US839935
申请日：1992-02-21
CPC分类号： C01B33/38
摘要： To prepare crystalline sodium silicates having a laminated 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 from a water glass solution which has a solids content of at least 20% by weight and is obtained by reaction of sand with sodium hydroxide solution in a molar ratio of SiO.sub.2 : Na.sub.2 O of (2.0 to 2.3) : 1, the water glass solution is treated with hot air of 200.degree. to 300.degree. C. in a spray drying zone to form a pulverulent, amorphous sodium silicate having a water content (determined as the loss on ignition at 700.degree. C.) of 15 to 23% by weight. The pulverulent, amorphous, water-containing sodium silicate is first ground, preferably to particle sizes of 1 to 50 .mu.m, before it is introduced into an inclined rotary tubular oven and treated in this in countercurrent with flue gas at temperatures of more than 500.degree. to 850.degree. C. to form crystalline sodium silicate. The sodium silicate issuing from the rotary tubular oven is first comminuted to particle sizes of 0.1 to 12 mm and finally ground to particle sizes of 2 to 400 .mu.m.
摘要翻译： 为了制备具有层压结构的结晶硅酸钠，（1.9-2.1）1的SiO 2与Na 2 O的摩尔比和固含量至少为20％的水玻璃溶液的含水量小于0.3重量％ ，通过砂（SiO 2 :Na 2 O）摩尔比为（2.0〜2.3）：1的砂与氢氧化钠溶液的反应得到，水玻璃溶液用200〜300℃的热风喷雾 干燥区形成15〜23重量％的含水量（以700℃测定为灼烧损失的粉末状）无定形硅酸钠。 粉末状，无定形的含水硅酸钠首先被研磨，优选为1至50μm的粒度，然后将其引入倾斜的旋转管式炉中，并在与500℃以上的温度下与烟道气逆流处理 DEG至850℃，形成结晶硅酸钠。 从旋转管式炉排出的硅酸钠首先粉碎成0.1〜12mm的粒径，最后研磨成2〜400μm的粒径。
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公开(公告)号：US5183651A
公开(公告)日：1993-02-02
申请号：US635933
申请日：1990-12-28
CPC分类号： C01B33/38
摘要： To prepare crystalline sodium silicates having a layer structure and the formula Na.sub.2 Si.sub.x O.sub.2x+1, in which x is between 2 and 3, sand and soda are first fused in a molar ratio of SiO.sub.2 /Na.sub.2 O of 2 to 3.5 at temperature of 1200.degree. to 1400.degree. C. The water-glass obtained in pieces after the melt has cooled is ground to particle sizes of less than 2 mm before it is treated at temperatures of 600.degree. to 800.degree. C. for 10 to 120 minutes in an elongated reaction zone with mechanical circulation. Finally, the material leaving the reaction zone is ground to a particle fineness of less than 1 mm.
摘要翻译： 为了制备具有层结构的结晶硅酸钠和其中x在2和3之间的式Na2SixO2x + 1，首先在1200至1400的温度下以SiO 2 / Na 2 O的摩尔比2至3.5熔融砂和苏打 将熔融物冷却后的片状水玻璃研磨至小于2mm的粒度，然后在600℃至800℃的温度下在延长的反应区域中处理10至120分钟， 机械循环。 最后，将离开反应区的材料研磨成小于1mm的颗粒细度。
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