Use of basic aluminium sulphates as low-alkali set accelerators for
cement
    1.
    发明授权
    Use of basic aluminium sulphates as low-alkali set accelerators for cement 失效
    使用碱性硫酸铝作为水泥的低碱凝固加速剂

    公开(公告)号:US5660625A

    公开(公告)日:1997-08-26

    申请号:US586688

    申请日:1996-01-24

    IPC分类号: C01F7/74 C04B22/14 C04B103/10

    CPC分类号: C04B22/148 C04B2103/10

    摘要: Improved set accelerating mixtures and their use are disclosed to shorten the period after mixing hydraulically setting building materials, for example cement, up to the transition into the solid phase. The improved set accelerating mixtures comprise basic aluminum sulphates of the formula: Al(OH).sub.a (SO.sub.4).sub.b, in which the subscripts satisfy the conditions:a=3-2b and b=0.05 to 0.4.These basic aluminum sulphates are produced by parallel precipitation from solutions containing aluminum at temperatures usually less than 60.degree. C. by mixing dilute acid solutions and alkaline solutions containing sulphates in the pH range from 5.0 to 8.0 to produce an amorphous, basic aluminum sulphate.

    摘要翻译: PCT No.PCT / EP94 / 02190 371日期:1996年1月24日 102(e)日期1996年1月24日PCT 1994年7月5日PCT公布。 公开号WO95 / 03257 日期1995年2月2日公开了改进的加速混合物及其用途,以缩短混合水硬性建筑材料(例如水泥)直到固相的过渡期。 改进的组合加速混合物包括下式的碱式硫酸铝:Al(OH)a(SO 4)b,其中下标满足条件:a = 3-2b和b = 0.05〜0.4。这些碱性硫酸铝由 通过在5.0至8.0的pH范围内混合稀酸溶液和含有硫酸盐的碱性溶液,通常在低于60℃的温度下从含有铝的溶液中平行析出,以产生无定形碱性硫酸铝。

    Solidifying and hardening accelerator for hydraulic binders
    2.
    发明授权
    Solidifying and hardening accelerator for hydraulic binders 有权
    水硬性粘合剂的固化和硬化促进剂

    公开(公告)号:US06302954B1

    公开(公告)日:2001-10-16

    申请号:US09297131

    申请日:1999-08-20

    IPC分类号: C04B2404

    摘要: A solidification and curing accelerator for hydraulic binders produced by a process including providing a reaction mixture composed of constituents (a) - (e) as follows: (a) at least one of basic aluminum salts which are substantially water insoluble and aluminum hydroxide; (b) at least one of aluminum sulfate which is substantially water soluble and sulfuric acid; (c) at least one of an organic carboxylic acid or mixtures of at least two organic carboxylic acids; (d) aluminum salts of organic carboxylic acids; and (e) at least one organic and inorganic substance selected from the group consisting of sulfates, hydrogen-sulfates, carbonates, hydrogen-carbonates, alkaline earth metal oxides, and alkaline earth metal hydroxides; adding water to the reaction mixture and reacting at a temperature ranging up to 150 ° C. for a time effective to provide a reaction product which is a solution in water.

    摘要翻译: 一种水硬性粘合剂的固化和固化促进剂,其通过包括提供由以下组分(a) - (e)组成的反应混合物的方法制备:(a)基本上不溶于水的碱性铝盐和氢氧化铝中的至少一种; (b)基本上为水溶性的硫酸铝和硫酸中的至少一种; (c)至少一种有机羧酸或至少两种有机羧酸的混合物; (d)有机羧酸的铝盐; 和(e)至少一种选自硫酸盐,硫酸氢盐,碳酸盐,碳酸氢盐,碱土金属氧化物和碱土金属氢氧化物的有机和无机物质; 向反应混合物中加入水,并在高达150℃的温度下反应一段时间,以提供作为水溶液的反应产物。

    Method of precipitating radium to yield high purity calcium sulfate from
phosphate ores
    3.
    发明授权
    Method of precipitating radium to yield high purity calcium sulfate from phosphate ores 失效
    沉淀镭以从磷酸盐矿石中产生高纯度硫酸钙的方法

    公开(公告)号:US3949047A

    公开(公告)日:1976-04-06

    申请号:US350476

    申请日:1973-04-12

    摘要: In the manufacture of phosphoric acid by treatment of phosphate ores with excess phosphoric acid and precipitation of calcium ions as calcium sulfate, the purity and quality of the byproduct calcium sulfate is substantially improved by subjecting the monocalcium phosphate extract of the ore before precipitation of calcium sulfate to one or more preliminary treatments, whereby contaminent ions are substantially and preferentially removed from the extract while the calcium remains substantially in solution. These preliminary treatments may include separation of fluoride by reaction with silicon compounds, separation of radium by reaction with barium compounds in the presence of sulfate ions, and separation of strontium as strontium sulfate.

    摘要翻译: 在通过用过量磷酸处理磷酸盐矿物和用钙离子作为硫酸钙沉淀来制造磷酸的过程中,通过在沉淀硫酸钙之前对矿石的一磷酸钙提取物进行处理,使副产物硫酸钙的纯度和质量得到显着改善 到一个或多个初步处理,其中污染物离子基本上和优先从提取物中除去,同时钙基本上保留在溶液中。 这些初步处理可以包括通过与硅化合物的反应分离氟化物,在硫酸根离子的存在下通过与钡化合物的反应分离镭,以及分离作为硫酸锶的锶。

    Wet-process technique for refining phosphoric acid
    4.
    发明授权
    Wet-process technique for refining phosphoric acid 有权
    湿法精制磷酸技术

    公开(公告)号:US06251351B1

    公开(公告)日:2001-06-26

    申请号:US09155448

    申请日:1999-08-20

    IPC分类号: C01B2516

    CPC分类号: C01B25/46

    摘要: A process for purification by multistage countercurrent extraction of wet-process phosphoric acid includes the steps of (a) preparing an aqueous phosphoric acid by decomposition of crude phosphates with sulfuric acid and prepurification thereof; (b) providing an organic solvent mixture consisting of one of (A) a water immiscible solvent and a fully water-miscible solvent or (B) a partially water-miscible solvent and a fully water-miscible solvent; (c) extracting water from the acid by contacting with the solvent mixture in a volumetric ratio of acid to solvent mixture of 1:1 to 1:10 at a temperature of 5 to 90° C.; (d) recovering the fully water-miscible solvent by distillation and washing; (e) recycling the fully water-miscible solvent to step (b) to provide a recycled solvent mixture; and (f) repeating steps (c), (d) and (e) with the recycled solvent mixture to provide a phosphoric acid having a preselected degree of purity.

    摘要翻译: 一种通过湿法磷酸的多级逆流提取进行纯化的方法包括以下步骤:(a)通过用硫酸分解粗制磷酸盐并预纯化制备磷酸水溶液; (b)提供由(A)与水不混溶的溶剂和完全与水混溶的溶剂之一组成的有机溶剂混合物或(B)部分水混溶性溶剂和完全与水混溶的溶剂; (c)在5至90℃的温度下,以1:1至1:10的体积比的酸与溶剂混合物与溶剂混合物接触,从酸中提取水; (d)通过蒸馏和洗涤回收完全与水混溶的溶剂; (e)将完全与水混溶的溶剂再循环到步骤(b)以提供循环的溶剂混合物; 和(f)用再循环的溶剂混合物重复步骤(c),(d)和(e),以提供具有预选纯度的磷酸。

    High molecular weight copolymers of maleic anhydride and methyl vinyl
ether
    6.
    发明授权
    High molecular weight copolymers of maleic anhydride and methyl vinyl ether 失效
    马来酸酐和甲基乙烯基醚的高分子量共聚物

    公开(公告)号:US5047490A

    公开(公告)日:1991-09-10

    申请号:US382064

    申请日:1989-07-14

    CPC分类号: C08F216/1416 C08F222/06

    摘要: A process of manufacturing powdered copolymers of maleic anhydride with methyl vinyl ether in a mole ratio of 1:1 and a specific viscosity in a range from 2 to 5 by copolymerization of maleic anhydride with methyl vinyl ether in the presence of radical initiators to initiate polymerization. The process includes mixing maleic anhydride with an excess of about 3 to about 20 mol methyl vinyl ether per mol maleic anhydride and initiating a polymerization reaction with a radical initiator added in a quantity of from about 0.001 to about 1 weight % with respect to the maleic anhydride. The polymerization reaction takes place in the absence of other solvents.

    摘要翻译: 通过在自由基引发剂的存在下使马来酸酐与甲基乙烯基醚共聚来制备马来酸酐与甲基乙烯基醚的摩尔比为1:1,比粘度为2至5的粉末状共聚物的方法,以引发聚合 。 该方法包括将马来酸酐与过量的约3至约20摩尔甲基乙烯基醚/摩尔马来酸酐混合并引发与自由基引发剂的聚合反应,其量为约0.001至约1重量% 酐。 聚合反应在不存在其它溶剂的情况下进行。