公开(公告)号：US06652825B2

公开(公告)日：2003-11-25

申请号：US09846728

申请日：2001-05-01

申请人： Gopalakrishnan Sethuraman ,  Claudette Brown ,  Ronald S. Finkelstein

发明人： Gopalakrishnan Sethuraman ,  Claudette Brown ,  Ronald S. Finkelstein

IPC分类号： C01B1796

CPC分类号： C04B11/032 ,  C04B11/024 ,  C04B40/0014

摘要： A method of producing calcium sulfate &agr;-hemihydrate is disclosed, including the steps of exposing a mixture including a calcium sulfate form selected from the group consisting of calcium sulfate dihydrate, calcium sulfate &bgr;-hemihydrate, water-soluble calcium sulfate anhydrite, and mixtures thereof, water, and a crystallization catalyst, to microwave radiation to produce calcium sulfate &agr;-hemihydrate; and separating at least a portion of the calcium sulfate &agr;-hemihydrate to provide a solid comprising calcium sulfate &agr;-hemihydrate and a filtrate and/or remainder that can be recycled to provide at least one of a calcium sulfate form, water, a crystallization catalyst, a crystal habit modifier, and a surfactant for use in production of additional &agr;-hemihydrate.

摘要翻译： 公开了一种生产硫酸钙α-半水合物的方法，包括以下步骤：将包含选自二水合硫酸钙，β-硫酸钙半水合物，水溶性硫酸钙无水石膏及其混合物的硫酸钙形式的混合物 ，水和结晶催化剂，以微波辐射产生硫酸钙α-半水合物; 并分离至少一部分硫酸钙α半水合物以提供包含硫酸钙α-半水合物和滤液和/或余量的固体，所述固体可以再循环以提供至少一种硫酸钙形式，水，结晶催化剂 ，水晶习性调节剂和用于生产另外的α-半水合物的表面活性剂。

公开(公告)号：US06780385B2

公开(公告)日：2004-08-24

申请号：US09858923

申请日：2001-05-17

申请人： Shigeru Sakurai ,  Yoichi Mori ,  Hachiro Hirano ,  Makoto Yoshida ,  Hiroaki Noda

发明人： Shigeru Sakurai ,  Yoichi Mori ,  Hachiro Hirano ,  Makoto Yoshida ,  Hiroaki Noda

IPC分类号： C01B1796

CPC分类号： B01D53/508 ,  B01D2251/304 ,  B01D2251/606

摘要： A method for treating a gas containing a SO3 component, which comprises adding a sodium carbonate powder having a mean particle diameter of at most 20 &mgr;m to the gas to remove the SO3 component from the gas.

摘要翻译： 一种用于处理含有SO 3组分的气体的方法，其包括将平均粒径最多为20微米的碳酸钠粉末加入到气体中以从气体中除去SO 3组分。

公开(公告)号：US06203769B1

公开(公告)日：2001-03-20

申请号：US09346114

申请日：1999-07-01

申请人： Gianni Zoppi

发明人： Gianni Zoppi

IPC分类号： C01B1796

CPC分类号： C01B17/96

摘要： The invention relates to a method for the treatment of fluoboric electrolyte resulting from the processes of electro-extraction of metals such as copper and lead comprising a leaching stage with fluoboric acid, in order to recycle said fluoboric acid to be recirculated to said leaching stage devoid of impurities of metals such as Me=Fe, Zn, Ca, Mg, Cd, characterized in that it comprises the stages of: a) treating said fluoboric electrolyte comprising Cu(BF4)2 or Pb(BF4)2 with H2S in order to precipitate CuS or PbS respectively in accordance with the reactions Cu(BF4)2+H2S=>CuS+2HBF4  (1) Pb(BF4)2+H2S=>PbS+2HBF4  (2) thus obtaining a solution of HBF4 containing the fluoborates of said metals Me, said solution being separated, b) treating said Me fluoborates with H2SO4 in accordance with the reaction 2 Me(BF4)n+n H2SO4=>Me(SO4)n+2n HBF4  (3) (where Me=Fe, Zn, Ca, Mg, Cd) it being possible for said sulphates Me(SO4)n to be removed so as to obtain a solution of HBF4 substantially free from impurities of said metals Me.

摘要翻译： 本发明涉及一种用于处理由电解提取金属如铜和铅的方法产生的氟硼酸电解质的方法，该方法包括用氟硼酸浸出阶段，以便将所述氟硼酸循环再循环到所述浸出级中 的金属杂质如Me = Fe，Zn，Ca，Mg，Cd，其特征在于它包括以下阶段：a）用H 2 S处理包含Cu（BF 4）2或Pb（BF 4）2的氟硼酸电解质，以便 根据反应分别沉淀CuS或PbS，得到含有所述金属Me的氟硼酸盐的HBF 4溶液，所述溶液分离，b）根据反应（其中Me = Fe，Zn，Ca）处理所述Me氟硼酸盐 ，Mg，Cd），可以除去所述硫酸盐Me（SO 4）n，以获得基本上不含所述金属Me的杂质的HBF 4溶液。