Small sized alpha alumina particles and platelets
    1.
    发明授权
    Small sized alpha alumina particles and platelets 失效
    小尺寸的α氧化铝颗粒和血小板

    公开(公告)号:US5149520A

    公开(公告)日:1992-09-22

    申请号:US460844

    申请日:1990-01-31

    IPC分类号: C01F7/14 C01F7/44

    摘要: A process for producing alpha alumina particles includes steps of precipitating alumina hydrate from an aqueous sodium aluminate solution by treatment with alumina hydrate seed material and alpha alumina promoter particles; and calcining the precipitated alumina hydrate in the presence of a mineralizer. A preferred mineralizer is aluminum fluoride. The process produces alpha alumina particles having a plate-like shape and an average size of less than about 1.5 microns.

    摘要翻译: PCT No.PCT / US89 / 02659 Sec。 371日期1990年1月31日第 102(e)日期1990年1月31日PCT 1989年6月19日PCT。一种生产α氧化铝颗粒的方法包括通过用氧化铝水合物种子材料和α氧化铝促进剂颗粒处理从铝酸钠水溶液中沉淀氧化铝水合物的步骤; 并在矿化剂存在下煅烧沉淀的氧化铝水合物。 优选的矿化剂是氟化铝。 该方法产生具有板状形状和平均尺寸小于约1.5微米的α氧化铝颗粒。

    HARD WATER FOAMING AGENTS AND METHODS FOR GYPSUM BOARD PRODUCTION
    3.
    发明申请
    HARD WATER FOAMING AGENTS AND METHODS FOR GYPSUM BOARD PRODUCTION 有权
    硬水泡沫剂及其制备方法

    公开(公告)号:US20090169864A1

    公开(公告)日:2009-07-02

    申请号:US11966749

    申请日:2007-12-28

    IPC分类号: C04B11/00 B32B3/26

    摘要: Compositions and methods for reducing the impact of hard water on gypsum board foaming are provided. The compositions include adding a foam to water and a calcined slurry. The foam includes water, dispersed air and a surfactant. Surfactants for use include a hydrophobic portion having an alkyl chain length distribution of about 20% to about 60% C8 chains; about 20% to about 60% C10 chains; about 14% to about 36% C12 chains and about 2% to about 20% C14 chains and also having a hydrophilic portion having about 0.2 to 3.0 ethoxy groups.

    摘要翻译: 提供了减少硬水对石膏板发泡影响的组合物和方法。 所述组合物包括向水和煅烧浆料中加入泡沫。 泡沫包括水,分散空气和表面活性剂。 使用的表面活性剂包括具有约20%至约60%C8链的烷基链长度分布的疏水部分; 约20%至约60%的C10链; 约14%至约36%的C12链和约2%至约20%的C14链,并且还具有约0.2至3.0个乙氧基的亲水部分。

    Alpha alumina production in a steam-fluidized reactor
    6.
    发明授权
    Alpha alumina production in a steam-fluidized reactor 失效
    在蒸汽流化反应器中生产α氧化铝

    公开(公告)号:US4585645A

    公开(公告)日:1986-04-29

    申请号:US719559

    申请日:1985-04-03

    申请人: Steven W. Sucech

    发明人: Steven W. Sucech

    IPC分类号: C01F7/44 C01F7/02

    摘要: A process for transforming alumina hydrate into an anhydrous product comprising at least 10 wt % alpha alumina. Alumina hydrate is dehydrated, heated and transferred to a reactor where it is fluidized with steam and maintained at a temperature of about 900.degree.-1350.degree. C. Steam fluidization enhances crystal growth and results in a product having uniform quality and superior grinding characteristics.

    摘要翻译: 将氧化铝水合物转化成包含至少10重量%的α氧化铝的无水产品的方法。 将氧化铝水合物脱水,加热并转移到反应器中,在其中用蒸汽流化并保持在约900℃-1350℃的温度。蒸汽流化增强晶体生长并产生具有均匀质量和优异研磨特性的产品。

    Method for preparing uniformly foamed gypsum product with less foam
agitation
    9.
    发明授权
    Method for preparing uniformly foamed gypsum product with less foam agitation 失效
    均匀发泡石膏制品的泡沫搅拌较少的方法

    公开(公告)号:US5683635A

    公开(公告)日:1997-11-04

    申请号:US577367

    申请日:1995-12-22

    摘要: The invention provides an improved method for preparing foamed gypsum products. The invention can utilize a single mixing chamber and significantly improve the efficiency of foaming agent usage. In the method of the invention the point of insertion of aqueous foam into calcined gypsum slurry is positioned such that the foam is agitated less than the calcined gypsum to thereby minimize destruction of the foam while still uniformly dispersing the foam in the calcined gypsum slurry. This is accomplished, for example, by locating an inlet for foam closer to the discharge outlet of a slurry mixing chamber than the location of the inlet for calcined gypsum or by locating the foam inlet in a discharge conduit connected to the discharge outlet of the slurry mixing chamber.

    摘要翻译: 本发明提供了一种制备泡沫石膏产品的改进方法。 本发明可以利用单个混合室,并显着提高发泡剂使用的效率。 在本发明的方法中,将水性泡沫体插入煅烧石膏浆料中的点被定位成使泡沫体比煅烧的石膏小得多的搅拌,从而最小化泡沫的破坏,同时仍将均匀分散在煅烧石膏浆料中的泡沫。 例如,这通过将用于泡沫的入口更靠近浆料混合室的排出口而不是用于煅烧石膏的入口的位置来定位,或通过将泡沫入口定位在连接到浆料的排出口的排放导管中 混合室。

    Steam producing process
    10.
    发明授权
    Steam producing process 失效
    蒸汽生产过程

    公开(公告)号:US5336480A

    公开(公告)日:1994-08-09

    申请号:US904610

    申请日:1992-06-26

    IPC分类号: C01B5/00 C01F7/44 F22B1/00

    摘要: In a process utilizing steam, the method of producing at least a portion of said steam includes heating a solid substance so as to generate steam, followed by capturing the generated steam at a pressure greater than one atmosphere gage pressure for use in the process at a pressure greater than one atmosphere gage pressure. Suitable solid substances are aluminum hydrate or aluminum fluoride. New hydrated aluminum containing products and uses for those products are obtained by the use of the process.

    摘要翻译: 在使用蒸汽的方法中,产生至少一部分所述蒸汽的方法包括加热固体物质以产生蒸汽,随后在大于1个气压计压力的压力下捕获所产生的蒸汽,以在该方法中使用 压力大于一个气压计压力。 合适的固体物质是水合铝或氟化铝。 通过使用该方法可获得新的含水铝产品及其用途。