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    Process for improved precious metals recovery from ores with the use of alkylhydroxamate collectors
    1.
    发明授权
    Process for improved precious metals recovery from ores with the use of alkylhydroxamate collectors 失效
    使用烷基羟肟酸盐收集器改善从矿石中回收贵金属的方法

    公开(公告)号：US5126038A

    公开(公告)日：1992-06-30

    申请号：US739585

    申请日：1991-08-02

    Applicant: D. R. Nagaraj

    Inventor： D. R. Nagaraj

    IPC: B03D1/004 ,  B03D1/01 ,  B03D1/02

    CPC classification number: B03D1/02 ,  B03D1/01 ,  B03D1/012 ,  B03D2201/02 ,  B03D2203/02 ,  B03D2203/04

    Abstract: Collector compositions for use in froth flotation processes for the benefication of precious metals i.e. gold, silver and platinum group metals (PGM) from sulfide ores containing especially pyrrite and pyrrhotite are disclosed. The collector comprises alkyl hydroxamic acids or their alkali metal or ammonium salts, preferably in combination with standard sulfide ore collectors such as xanthates etc.

    Abstract translation: 公开了用于泡沫浮选方法的收集剂组合物，其有益于贵金属，即含有特别是金字塔和磁黄铁矿的硫化矿的金，银和铂族金属（PGM）。 收集器包括烷基异羟肟酸或其碱金属或铵盐，优选与标准硫化物矿物收集剂如黄原酸酯等组合。

    Process for the flotation of base metal sulfide minerals in acid, neutral or mildly alkaline circuits
    2.
    发明授权
    Process for the flotation of base metal sulfide minerals in acid, neutral or mildly alkaline circuits 失效
    在酸性，中性或弱碱性电路中浮选碱金属硫化矿物的方法

    公开(公告)号：US4556482A

    公开(公告)日：1985-12-03

    申请号：US641659

    申请日：1984-08-17

    Applicant: D. R. Nagaraj

    Inventor： D. R. Nagaraj

    IPC: B03D1/012 ,  B03D1/14

    CPC classification number: B03D1/012 ,  B03D2201/02 ,  B03D2203/02

    Abstract: A process for the beneficiation of copper sulfide mineral values from base metal sulfide ores with selective rejection of pyrite and/or pyrrhotite or other gangue minerals at pH values of below about 10.0 by froth flotation is disclosed. The process includes the use of a new and improved collector which at pH values below 10.0 exhibits unexpectedly high collector activity for copper sulfide minerals and selectively rejects pyrite and other gangue sulfides or non-sulfides. The collector for copper mineral values for use in the process comprises at least one hydrocarboxycarbonyl thiourea compound having the formula: ##STR1## wherein R.sup.1 is hydrogen or R.sup.2 ; R.sup.2 is C.sub.1 -C.sub.8 alkyl and R.sup.3 is C.sub.1 -C.sub.6 alkyl or phenyl. In a preferred embodiment of the present invention, froth flotation is conducted under acid pH conditions by adjusting the pH of the flotation slurry with sulfuric acid. The process provides excellent metallurgical recoveries of copper sulfide mineral values of high grade at a substantial reduction in lime consumption and reagents costs associated with prior art flotation separation methods.

    Abstract translation: 公开了一种通过泡沫浮选在pH值低于约10.0的碱金属硫化物矿选择性排除黄铁矿和/或磁黄铁矿或其他脉石矿物的硫化铜矿物值的方法。 该方法包括使用在pH值低于10.0的新的和改进的收集器对于硫化铜矿物显示出意想不到的高收集器活性，并选择性地排除黄铁矿和其它ang石硫化物或非硫化物。 用于该方法的铜矿物价值的收集器包含至少一种具有下式的羧基羰基硫脲化合物：其中R 1是氢或R 2; R2是C1-C8烷基，R3是C1-C6烷基或苯基。 在本发明的优选实施方案中，通过用硫酸调节浮选浆液的pH，在酸性pH条件下进行泡沫浮选。 该方法提供了高等级的硫化铜矿物质的极好的冶金回收率，显着降低了石灰消耗量和与现有技术浮选分离方法相关的试剂成本。

    Method of depressing non-sulfide silicate gangue minerals
    3.
    发明授权
    Method of depressing non-sulfide silicate gangue minerals 失效
    抑制非硫化物硅酸盐脉石矿物的方法

    公开(公告)号：US5531330A

    公开(公告)日：1996-07-02

    申请号：US474805

    申请日：1995-06-07

    Applicant: D. R. Nagaraj ,  Samuel S. Wang

    Inventor： D. R. Nagaraj ,  Samuel S. Wang

    IPC: B03D1/016 ,  B03D1/06

    CPC classification number: B03D1/016 ,  B03D1/01 ,  B03D1/012 ,  B03D1/014 ,  B03D2201/06 ,  B03D2203/02 ,  B03D2203/04

    Abstract: A method for the depression of non-sulfide, silicate gangue minerals is provided wherein the depressant is a polymeric material comprising recurring units of the formula: ##STR1## wherein X is the polymerization residue of an acrylamide or mixture of acrylamides, Y is an hydroxy group containing polymer unit, Z is an anionic group containing polymer unit, x represents a residual mole fraction of at least about 35%, y represents a residual mole fraction of from about 1 to 50% and z represents a residual mole fraction of from about 0 to about 50%.

    Abstract translation: 提供了一种用于抑制非硫化物，硅酸盐脉石矿物的方法，其中抑制剂是包含下式的重复单元的聚合物：其中X是丙烯酰胺或丙烯酰胺混合物的聚合残基，Y是羟基 含有基团的聚合物单元，Z是含阴离子基团的聚合物单元，x表示至少约35％的残余摩尔分数，y表示约1-50％的残余摩尔分数，z表示从约 0〜约50％。

    Monothiophosphinates as acid, neutral, or mildly alkaline circuit sulfide collectors and process for using same
    6.
    发明授权
    Monothiophosphinates as acid, neutral, or mildly alkaline circuit sulfide collectors and process for using same 失效
    单硫代磷酸盐作为酸，中性​​或弱碱性电路硫化物收集器及其使用方法

    公开(公告)号：US4661278A

    公开(公告)日：1987-04-28

    申请号：US817209

    申请日：1986-01-08

    Applicant: D. R. Nagaraj ,  Samuel S. Wang

    Inventor： D. R. Nagaraj ,  Samuel S. Wang

    IPC: B03D1/014 ,  C07F9/30 ,  C09K3/00

    CPC classification number: B03D1/014 ,  B03D2201/02 ,  B03D2203/02

    Abstract: A process for the beneficiation of base metal sulfide mineral values from base metal sulfide ores with selective rejection of gangue sulfide minerals at pH values below about 10.0 by froth flotation is disclosed. The process includes the use of a new and improved collector which at pH values below about 10.0 exhibits unexpectedly high collector activity for base metal sulfide minerals of copper, nickel, molybdenum, cobalt and zinc and selectively rejects gangue sulfide minerals such as pyrite and pyrrhotite. The collector for base metal sulfide mineral values for use in the process comprises at least one diorganomonothiophosphinate compound having the formula: ##STR1## wherein R.sup.1 and R.sup.2 are each, independently, selected from saturated and unsaturated hydrocarbyl radicals, alkyl polyether radicals, and aromatic radicals, and such radicals, optionally and independently, substituted with polar groups selected from halogen, nitrile and nitro groups; or wherein R.sup.1 and R.sup.2 together form a heterocyclic ring having the formula: ##STR2## wherein R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are each, independently, selected from hydrogen and C.sub.1 to C.sub.12 alkyl groups; and X is selected from hydrogen, an alkali or alkaline earth metal and NH.sub.4 groups. The collectors and process provide excellent metallurgical recoveries of copper sulfide mineral values of high grade at a substantial reduction in lime consumption and reagents costs associated with prior art flotation separation methods. An improved process for Cu-Mo separation is also disclosed.

    Abstract translation: 公开了一种通过泡沫浮选在pH值低于约10.0的碱性金属硫化物矿石中选择性排斥ang石硫化物矿物的方法。 该方法包括使用新的和改进的收集器，其pH值低于约10.0，对铜，镍，钼，钴和锌的贱金属硫化物矿物表现出意想不到的高收集活性，并选择性地排除脉石硫化物矿物如黄铁矿和磁黄铁矿。 用于该方法的用于贱金属硫化物矿物的收集器包含至少一种具有下式的二有机硫代磷酸盐化合物：其中R 1和R 2各自独立地选自饱和和不饱和的烃基，烷基聚醚基团和芳族基团 并且任选和独立地被选自卤素，腈和硝基的极性基团取代的这些基团; 或其中R 1和R 2一起形成具有下式的杂环：其中R 3，R 4，R 5，R 6，R 7和R 8各自独立地选自氢和C 1至C 12烷基; X选自氢，碱金属或碱土金属和NH 4基团。 收集器和工艺提供了高等级铜硫化物矿物质的极好的冶金回收率，大大降低了石墨消耗量和与现有技术浮选分离方法相关的试剂成本。 还公开了一种改进的Cu-Mo分离方法。

    Process for removing impurities from kaolin clays
    8.
    发明授权
    Process for removing impurities from kaolin clays 有权
    从高岭土中除去杂质的方法

    公开(公告)号：US06390301B1

    公开(公告)日：2002-05-21

    申请号：US09618463

    申请日：2000-07-18

    Applicant: D. R. Nagaraj ,  Roderick G. Ryles ,  Alan S. Rothenberg

    Inventor： D. R. Nagaraj ,  Roderick G. Ryles ,  Alan S. Rothenberg

    IPC: B03B100

    CPC classification number: B03D3/06 ,  B03B1/04 ,  C01P2006/60 ,  C01P2006/80 ,  C09C1/42

    Abstract: A process for the flocculation of impurities from clays in which the following steps are performed: blunging the clay with a dispersing agent or combination of dispersing agents in water to form an aqueous dispersion, treating the aqueous dispersion with at least one aliphatic or aromatic hydroxamic acid or salt conditioning agent, flocculating the conditioned dispersion with a water soluble or water dispersible organic polymer containing hydroxamic acid groups or salts thereof, and removing the flocculated impurities to form a purified clay dispersion.

    Abstract translation: 一种用于从粘土中絮凝杂质的方法，其中进行以下步骤：将粘土用分散剂或分散剂的组合在水中分散以形成水分散体，用至少一种脂族或芳族异羟肟酸处理水性分散体 或盐调理剂，用含有异羟肟酸基团或其盐的水溶性或水分散性有机聚合物絮凝调节的分散体，并除去絮凝杂质以形成纯化的粘土分散体。

    Method of depressing non-sulfide silicate gangue minerals
    9.
    发明授权
    Method of depressing non-sulfide silicate gangue minerals 失效
    抑制非硫化物硅酸盐脉石矿物的方法

    公开(公告)号：US5533626A

    公开(公告)日：1996-07-09

    申请号：US475160

    申请日：1995-06-07

    Applicant: D. R. Nagaraj ,  Samuel S. Wang ,  James S. Lee ,  Lino G. Magliocco

    Inventor： D. R. Nagaraj ,  Samuel S. Wang ,  James S. Lee ,  Lino G. Magliocco

    IPC: B03D1/016 ,  B03D1/02

    CPC classification number: B03D1/016 ,  B03D1/008 ,  B03D1/01 ,  B03D2201/06 ,  B03D2203/02

    Abstract: A method for the depression of non-sulfide, silicate gangue minerals is provided wherein the depressant is a polymeric mixture of a polysaccharide and a material comprising recurring units of the formula: ##STR1## wherein X is the polymerization residue of an acrylamide or mixture of acrylamides, Y is an hydroxy group containing polymer unit, Z is an anionic group containing polymer unit, x represents a residual mole fraction of at least about 35%, y represents a residual mole fraction of from about 1 to 50% and z represents a residual mole fraction of from about 0 to about 50%.

    Abstract translation: 提供了一种用于抑制非硫化物，硅酸盐脉石矿物的方法，其中所述抑制剂是多糖和包含下式的重复单元的材料的聚合混合物：其中X是丙烯酰胺的聚合残基或 丙烯酰胺，Y是含羟基的聚合物单元，Z是含阴离子基团的聚合物单元，x表示至少约35％的残余摩尔分数，y表示约1至50％的残余摩尔分数，z表示 残余摩尔分数为约0至约50％。

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