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    • 8. 发明申请
    • RED GYPSUM IN CIVIL ENGINEERING APPLICATIONS
    • 公民工程应用中的红色胶囊
    • WO2003070657A1
    • 2003-08-28
    • PCT/EP2003/001173
    • 2003-02-06
    • TIOXIDE GROUP SERVICES LIMITEDTOOZE, Judith, FrancesNOBLE, Brian, CameronAUGUST, Alfred, Edward
    • TOOZE, Judith, FrancesNOBLE, Brian, CameronAUGUST, Alfred, Edward
    • C04B18/04
    • C04B28/18C04B18/0445C04B32/00C04B2111/00732C09K17/06C09K17/08Y02W30/91Y02W30/92Y02W30/94C04B14/361C04B18/08C04B18/141
    • Provided herein are new uses for red gypsum, a waste material from the production of titanium dioxide which contains between 60-90 % CaSO 4 .2H 2 O; 3-35 % iron (II) and iron (III) oxide/hydroxides, expressed as Fe(OH) 3 ; 0.3 to 2 % TiO 2 ; 0.1 to 4% SiO 2 ; 0.1 to 0.8 % Na 2 O; 0.1 to 5 % CaCO 3 0.1 to 0.4 % MgO; 0.1 to 0.2 % potassium, calculated as K 2 O; and 0.1 to 0.2 % phosphorous, calculated as P 2 O 5 . We have found that adding red gypsum to soils stiffens and strengthens the soils. Thus provided herein are stabilized soil mixtures comprising red gypsum. Further disclosed are cementitious compositions which comprise red gypsum; an aluminosilicate source such as a clay, fly ash, or ground blastfurnace slag; and lime. The cementitious compositions of the present invention are not substantially anhydrous as is ordinary Portland cement, but rather contain substantial amounts of water. Yet, strengths comparable to Portland cement are surprisingly exhibited by the disclosed compositions. It seems that the minor components inherently present in the red gypsum contribute to the surprising strengths from the hydrated cements of the invention.
    • 本文提供了红石膏的新用途,二氧化钛生产中含有60-90%CaSO 4·2H 2 O 3-35%铁II和铁III氧化物/氢氧化物的废料,以FeOH3 0.3-2%TiO 2表示 至4%SiO 2 0.1至0.8%Na 2 O 0.1至5%CaCO 3 0.1至0.4%MgO 0.1至0.2%的钾,以K 2 O计,0.1至0.2%的磷,以P2O5计算。 我们发现在土壤中加入红石膏会加固土壤。 因此,本文提供了稳定的包含红石膏的土壤混合物。 进一步公开的是包含红石膏和硅酸铝源如粘土,飞灰或磨碎的炉渣和石灰的水泥质组合物。 本发明的水泥组合物与普通硅酸盐水泥一样基本上不是无水的,而是含有大量的水。 然而,与波特兰水泥相当的强度由公开的组合物令人惊奇地展现出来。 似乎存在于红石膏中的次要组分有助于本发明的水合水泥的令人惊奇的强度。