Method for producing alkali metal silicates by heating cristobalite or
tempered quartz sand with NaOH or KOH under atmospheric pressure
    1.
    发明授权
    Method for producing alkali metal silicates by heating cristobalite or tempered quartz sand with NaOH or KOH under atmospheric pressure 失效
    通过在大气压力下加入含有氢氧化钠或氢氧化钾的烧结石或煅烧石英砂制造碱金属硅酸盐的方法

    公开(公告)号:US5215732A

    公开(公告)日:1993-06-01

    申请号:US859427

    申请日:1992-05-26

    IPC分类号: C01B33/32

    CPC分类号: C01B33/32

    摘要: Method for producing alkali metal silicates from crystalline siliceous material and aqueous alkali metal hydroxide solution at high temperature and normal pressure, characterized in that cristobalite and/or tempered quartz sand are used as the siliceous material, and this material is reacted with aqueous, 20 to 50 wt. % sodium or potassium hydroxide solution at temperatures of 100.degree. to 150.degree. C. and normal pressure, the molar ratio of SiO.sub.2 to Na.sub.2 O or K.sub.2 O in the reaction mixture being between 2:1 and 1:7.

    摘要翻译: PCT No.PCT / EP90 / 01947 Sec。 371日期:1992年5月26日 102(e)日期1992年5月26日PCT提交1990年11月14日PCT公布。 出版物WO91 / 08169 日期:1993年6月13日。在高温常压下从结晶硅质材料和碱金属氢氧化物水溶液制造碱金属硅酸盐的方法,其特征在于使用方石英和/或回火石英砂作为硅质材料,该材料 与20〜50重量%的水相反应。 %的氢氧化钠或氢氧化钾溶液在100-150℃和常压下,反应混合物中SiO 2与Na 2 O或K 2 O的摩尔比在2:1和1:7之间。

    Process for hydrothermal production of potassium silicate solutions
    4.
    发明授权
    Process for hydrothermal production of potassium silicate solutions 失效
    氢氧化硅溶液的热水生产工艺

    公开(公告)号:US5084262A

    公开(公告)日:1992-01-28

    申请号:US473263

    申请日:1990-01-31

    IPC分类号: C01B33/32

    CPC分类号: C01B33/32

    摘要: The direct hydrothermal production of high purity potassium silicate solutions having a high SiO.sub.2 : K.sub.2 O molar ratio by reaction of a silicon dioxide source with aqueous potassium hydroxide solutions is made possible by using a silicon dioxide source that contains a sufficient fraction of cristobalite phase, or by conditioning other crystalline forms of silicon dioxide by heating at or above 1100.degree. C., but below the melting point of silica, before the hydrothermal treatment. Preferably the potassium hydroxide solution has a concentration range of 10 to 40% by weight, and the reaction is carried out in a closed pressure reactor at temperatures of 150.degree. to 300.degree. C. and under saturated steam pressures corresponding to those temperatures.

    摘要翻译: 通过二氧化硅源与氢氧化钾水溶液的反应,通过二氧化硅源与氢氧化钾水溶液的反应,可以直接水热生产具有高二氧化硅:K 2 O摩尔比的高纯度硅酸钾溶液。通过使用含有足够部分方英石相的二氧化硅源,或通过 在水热处理之前通过在1100℃以上加热但低于二氧化硅的熔点来调节其它结晶形式的二氧化硅。 优选地,氢氧化钾溶液的浓度范围为10〜40重量%,反应在150℃〜300℃的密闭压力反应器中进行,在对应于这些温度的饱和蒸气压下进行。

    Hydrothermal decomposition of aluminum silicates
    9.
    发明授权
    Hydrothermal decomposition of aluminum silicates 失效
    硅酸铝的水热分解

    公开(公告)号:US4499062A

    公开(公告)日:1985-02-12

    申请号:US499037

    申请日:1983-05-27

    摘要: A process for the hydrothermal fusion of aluminum silicate and alkali aluminum silicates with aqueous sodium hydroxide solution under pressure and at elevated temperatures in the presence of soluble silicates, in which an aqueous solution containing from about 20 to about 50% by weight of NaOH is mixed with aluminum silicates and/or alkali aluminum silicates, and with a hydrothermally fusible silicate component, wherein the ratio by weight of SiO.sub.2 to Al.sub.2 O.sub.3 in the mixture amounts to at least 30:1 and the ratio by weight of SiO.sub.2 to Na.sub.2 O amounts to at least 1.5:1, and the mixtures are reacted at temperatures of from about 180.degree. to about 250.degree. C. and under the saturated steam pressures corresponding to those temperatures. The resulting sodium silicate solution, which contains the dissolved aluminum, is then separated off.

    摘要翻译: 在可溶性硅酸盐的存在下,在压力和升高的温度下,将硅酸铝和碱金属铝硅酸盐与氢氧化钠水溶液水热熔融的方法,其中将含有约20至约50重量%的NaOH的水溶液混合 与硅酸铝和/或碱金属硅酸铝,以及水热熔融硅酸盐组分,其中混合物中SiO 2与Al 2 O 3的重量比至少为30:1,SiO 2与Na 2 O的重量比至少为 1.5:1,混合物在约180℃至约250℃的温度下反应,并在相应于这些温度的饱和蒸气压下进行。 然后将所得的含有溶解的铝的硅酸钠溶液分离出来。

    Process for production of potassium silicate solutions by the addition
of tempered quartz to hydrothermally reacted quartz and KOH, and
hydrothermal reaction thereof
    10.
    发明授权
    Process for production of potassium silicate solutions by the addition of tempered quartz to hydrothermally reacted quartz and KOH, and hydrothermal reaction thereof 失效
    通过将温度补充的石墨添加到水热反应的石英和KOH中生产硅酸钠溶液的方法及其氢热反应

    公开(公告)号:US5238668A

    公开(公告)日:1993-08-24

    申请号:US859422

    申请日:1992-05-26

    IPC分类号: C01B33/32

    CPC分类号: C01B33/32

    摘要: A process is disclosed for the hydrothermal production of potassium silicate solutions with high SiO.sub.2 :K.sub.2 O molar ratios, by the hydrothermal reaction of quartz sand with aqueous potassium hydroxide solutions at temperatures in the range of 150.degree. to 300.degree. C. at the pressures of saturated water vapor corresponding to these temperatures in a pressure reactor, which is characterized in that the potassium silicate solutions obtained thereby, which have SiO.sub.2 :K.sub.2 O molar ratios of less than 2.75:1, are then reacted with a quartz tempered at temperatures in the range of over 1100.degree. C. up to melting point, the temperatures and pressures also being maintained in the ranges named.

    摘要翻译: PCT No.PCT / EP90 / 01948 Sec。 371日期:1992年5月26日 102(e)日期1992年5月26日PCT提交1990年11月14日PCT公布。 出版物WO91 / 08170 日期:1991年6月13日。公开了通过石英砂与氢氧化钾水溶液在150℃至300℃的温度范围内的水热反应,以高SiO 2:K 2 O摩尔比水热生产硅酸钾溶液的方法 C.在压力反应器中对应于这些温度的饱和水蒸气的压力下,其特征在于由SiO 2 :K 2 O摩尔比小于2.75:1获得的由此获得的硅酸钾溶液与石英 在超过1100℃的温度范围内回火至熔点,温度和压力也保持在所述范围内。