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    Process for making construction grade calcium sulfate alpha-hemihydrate from moist finely divided gypsum obtained from a power plant flue gas desulfurization
    3.
    发明授权
    Process for making construction grade calcium sulfate alpha-hemihydrate from moist finely divided gypsum obtained from a power plant flue gas desulfurization 失效
    从发电厂烟气脱硫获得的潮湿细碎石膏中制造建筑级硫酸钙α-半水合物的工艺

    公开(公告)号：US5015449A

    公开(公告)日：1991-05-14

    申请号：US197604

    申请日：1988-05-23

    申请人： Thomas J. Koslowski

    发明人： Thomas J. Koslowski

    IPC分类号： B01J20/04 ,  A01K1/015 ,  B28B7/34 ,  C01F11/46 ,  C04B11/02 ,  C04B11/024 ,  C04B11/26 ,  C04B18/02 ,  C04B22/14 ,  C04B28/14 ,  C04B38/08 ,  E04F15/12

    CPC分类号： C04B22/143 ,  A01K1/0154 ,  C01F11/466 ,  C04B11/02 ,  C04B11/024 ,  C04B11/268 ,  C04B18/027 ,  E04F15/12 ,  C01P2006/14

    摘要： The process makes calcium sulfate alpha-hemihydrate or essentially plaster of paris from finely divided gypsum made by desulfurizing flue gas obtain from a power plant fired by brown coal by transforming the calcium sulfate dihydrate in the presence of saturated steam. A molded body is formed from the calcium sulfate dihydrate which has a plurality of pores. The pore volume amounts to 15 to 60% by volume of the total volume of the entire molded body. More than 5% by volume of the pore volume contains air. The molded body is fed to an autoclave. In the presence of a sufficient water quantity in the pores, the crystal habit and the crystal growth of the calcium sulfate alpha-hemihydrate crystals which grow in an aqueous solution phase are controlled by a process temperature in the range between 110.degree. to 180.degree. C. by the pressure of the treatment atmosphere in the autoclave. The molded body is removed from the autoclave after recrystallization transformation and delivered for use. Key products of this process and their derivatives are also described.

    摘要翻译： 该方法通过在饱和蒸汽存在下转化硫酸钙二水合物，从由褐煤燃烧的发电厂获得的脱硫烟气制备的来自细碎石膏的硫酸钙α-半水合物或基本上是石膏。 成型体由具有多个孔的硫酸钙二水合物形成。 孔体积为整个成形体的总体积的15〜60体积％。 超过5体积％的孔体积含有空气。 将成型体送入高压釜。 在孔中存在足够的水量的情况下，在水溶液相中生长的硫酸钙α半水合物晶体的晶体习性和晶体生长受到110-180℃范围内的处理温度的控制 通过高压釜中的处理气氛的压力。 在重结晶转化后将成型体从高压釜中取出并输送使用。 还描述了该方法的关键产物及其衍生物。

    Expandable cement composition
    4.
    发明授权
    Expandable cement composition 失效
    可膨胀水泥组合物

    公开(公告)号：US4797159A

    公开(公告)日：1989-01-10

    申请号：US890672

    申请日：1986-07-25

    申请人： Lloyd B. Spangle

    发明人： Lloyd B. Spangle

    IPC分类号： C04B2/10 ,  C04B22/06 ,  C09K8/42 ,  C09K8/46 ,  C04B7/02 ,  C04B7/32 ,  C04B9/00 ,  C04B11/02

    CPC分类号： C04B2/102 ,  C04B22/066 ,  C09K8/42 ,  C09K8/46 ,  C04B2111/34

    摘要： Particulate magnesium oxide prepared by calcining magnesium oxide at between about 1100.degree. C. and about 1500.degree. C. At least about 80% of the magnesium oxide particles are between about 150 microns to about 400 microns in diameter. This magnesium oxide is capable of producing expansion in set cements when the temperature thereof is at least about 60.degree. C. Preferably the magnesium oxide has been calcined at between about 1100.degree. C. to about 1300.degree. C. for about 1 to about 3 hours, and at least about 80% of the particles are between about 200 microns to about 325 microns. Further, the BET surface area of the particles is preferably between about 0.8 to about 1.8 m.sup.2 /g, and the acid neutralization time (using the method described) is between about 15 to 20 minutes, and further preferably between about 17 to about 25 minutes. Expandable cement compositions using such magnesium oxide, and a method of using them in cementing of wells, are also disclosed.

    摘要翻译： 通过在约1100℃至约1500℃下煅烧氧化镁制备的颗粒状氧化镁。至少约80％的氧化镁颗粒直径在约150微米至约400微米之间。 当氧化镁的温度至少为约60℃时，该氧化镁能够在凝固水泥中产生膨胀。优选氧化镁在约1100℃至约1300℃下煅烧约1至约3小时 ，并且至少约80％的颗粒在约200微米至约325微米之间。 此外，颗粒的BET表面积优选在约0.8至约1.8m 2 / g之间，酸中和时间（使用所述方法）为约15至20分钟，进一步优选为约17至约25分钟 。 还公开了使用这种氧化镁的可膨胀水泥组合物及其在水泥固井中的使用方法。

    Preparation of a calcium sulfate anhydrite material of low chloride content
    5.
    发明授权
    Preparation of a calcium sulfate anhydrite material of low chloride content 失效
    制备低氯化物含量的硫酸钙无水石膏材料

    公开(公告)号：US4495162A

    公开(公告)日：1985-01-22

    申请号：US413417

    申请日：1982-08-31

    申请人： Ebbe S. Jons ,  Klaus E. Gude

    发明人： Ebbe S. Jons ,  Klaus E. Gude

    IPC分类号： B01D53/34 ,  B01D53/50 ,  C01F11/46 ,  C04B11/26 ,  C04B22/14 ,  C04B11/02 ,  C04B11/00

    CPC分类号： C04B11/264 ,  B01D53/34 ,  B01D53/501 ,  C01F11/464 ,  C04B22/145

    摘要： A calcium sulfate anhydrite material is prepared from a spent absorbent resulting from desulfurization of flue gases. First the sulfite in the spent absorbent is oxidized into sulfate, preferably by heating in an oxygen containing gas, and thereafter the chloride content of the spent absorbent is reduced by heating the spent absorbent at a temperature of 600.degree.-950.degree., preferably 750.degree.-950.degree. C. together with fly ash. Said fly ash may be recovered together with the spent absorbent in the desulfurization process, or it may have been recovered separately and mixed with the spent absorbent.The product may be used as cement additive or for other purposes in which calcium sulfate anhydrite is conventionally utilized.

    摘要翻译： 硫酸钙无水石膏材料由废气脱硫制成的废吸附剂制备。 首先将废弃的吸收剂中的亚硫酸盐氧化为硫酸盐，优选通过在含氧气体中加热，然后通过在600-950℃，优选750℃的温度下加热废吸收剂来减少废弃的吸收剂的氯化物含量。 -950℃以及粉煤灰。 所述飞灰可以在脱硫过程中与废吸收剂一起回收，或者可以单独回收并与废吸收剂混合。 该产品可以用作水泥添加剂或用于通常使用硫酸钙无水石膏的其它目的。

    Continuous calcining of gypsum
    6.
    发明授权
    Continuous calcining of gypsum 失效
    连续煅烧石膏

    公开(公告)号：US4101630A

    公开(公告)日：1978-07-18

    申请号：US815707

    申请日：1977-07-14

    申请人： Rodney A. Stiling

    发明人： Rodney A. Stiling

    IPC分类号： C04B11/02 ,  C04B11/028 ,  F27B15/00

    CPC分类号： F27B15/00 ,  C04B11/02 ,  C04B11/028

    摘要： A continuous calciner, particularly advantageous in converting gypsum to plaster, with two coaxial cylindrical walls, provides for heating air within the inner cylinder and then directing the air, for conveying and heating fine particles, along a spiral path, between the walls of the two coaxial cylinders, extending from one end of the calciner to an exit at the second end.

    Process for obtaining a building material comprising hydrated lime and plaster
    9.
    发明授权
    Process for obtaining a building material comprising hydrated lime and plaster 失效
    获得包含熟石灰和石膏的建筑材料的方法

    公开(公告)号：US3945841A

    公开(公告)日：1976-03-23

    申请号：US364932

    申请日：1973-05-29

    申请人： Philippe A. Dumont

    发明人： Philippe A. Dumont

    IPC分类号： C04B28/14 ,  C04B2/04 ,  C04B11/02 ,  C04B11/00

    CPC分类号： C04B28/14 ,  C04B11/02

    摘要： Natural or synthetic gypsum is reacted with quicklime in any desired proportions, the heat needed for the complete conversion of gypsum in plaster being supplied, on the one hand, by the exothermic reaction of hydration of the quicklime and, on the other hand, by an external supply of calories obtained by indirect heating of the reaction mixture. This indirect heating may be effected by convection and conduction or by radiation from a metallic wall.

    摘要翻译： 天然或合成石膏与生石灰以任何所需的比例反应，一方面通过生石灰水化的放热反应，完全转化供给石膏的石膏所需的热量，另一方面，由 通过间接加热反应混合物获得的外部供应热量。 这种间接加热可以通过对流和传导或通过来自金属壁的辐射来实现。