公开(公告)号：DE2546180A1

公开(公告)日：1977-04-28

申请号：DE2546180

申请日：1975-10-15

Applicant: HOECHST AG

Inventor： CUNTZE ULRICH DR ,  EDELMANN GERHARD DR ,  METZA LEOPOLD

IPC: B03D1/01 ,  B03D1/02

Abstract: Method is effected using flotation. Collectors are 1-amidoethyl-imidazolines having formula (I): (where R1 and R2 are 8-22 (pref. 12-18)C alk(en)yl gps.). A standard flotation process is used. (I) is added to flotation slurry contg. the ground, crude ore. Foaming- and auxiliary agents may be added. (I) are used esp. for collecting pyrochlore, columbite, pandaite, betaphite, etc. (I) do not collect quartz, calcite and other contaminating minerals. Concn. achieved with (I) is higher than that achieved by using 1-hydroxyalkyl-2-or 1-aminoalkyl-2-alkyl imidazolines as collectors.

公开(公告)号：DE4040474A1

公开(公告)日：1991-06-27

申请号：DE4040474

申请日：1990-12-18

Applicant: HOECHST AG

Inventor： EDELMANN GERHARD DR ,  SCHIMMEL GUENTER DR ,  SVARA JUERGEN DR ,  ULRICHS KLAUS DR ,  WOLSTEIN FRIEDRICH DR

IPC: C07F9/165

Abstract: Novel dithiophosphoric acid esters of formula (I) are claimed as is also pptn. and flotation of heavy metals from mineral acids by use of (R-(OC2H4)x-O)2PS2M (I) where R = branched 9-18C alk(en)yl; M = H, Na, K or ammonium; and x = 0-6, pref. 0-4. USE/ADVANTAGE - (I) can be used to remove Zn, Cd, Hg, Cu, Ni or As esp. from crude phosphoric acid (e.g, as obtd. in wet processing to give crude phosphates) or from H2SO4 (e.g, dil. waste acid from Pb batteries). Not only does the use of higher isomers of the alcohols as ester-forming components more strongly reduce the solubility of the heavy metals complexes as compared to that attained using the `Cd-collector' dithiophosphoric acid esters of US 4634580, but the flotation of the complexes is also increased. Also, the flotation is increased with increasing distancing of the C side chain of the alcohol from the ester band (i.e. with terminal branching). Use of (I) can reduce the amt. of heavy metals in mineral acids by over 95%.

公开(公告)号：DE2614260A1

公开(公告)日：1977-10-27

申请号：DE2614260

申请日：1976-04-02

Applicant: HOECHST AG

Inventor： EDELMANN GERHARD DR ,  MUELLER HEINZ DR ,  ROSENSTOCK FRIEDRICH

IPC: B01J19/00 ,  B01D21/01 ,  B01D37/03 ,  B01J20/22 ,  B01D37/02

Abstract: An improved process for concentrating and dewatering of mineral suspensions by filtration which comprises adding to the suspension prior to the filtration as filter aid a composition containing a sulfosuccinate of the formula I wherein R1 and R2 each are an alkyl radical having about 6 to 12 carbon atoms and Me is an alkali metal, and an aliphatic amine having at least 5 carbon atoms.

公开(公告)号：DE4446924A1

公开(公告)日：1996-07-04

申请号：DE4446924

申请日：1994-12-28

Applicant: HOECHST AG

Inventor： BIGMORE ROBERT ,  EDELMANN GERHARD DR ,  KREMER GERNOT DR ,  GLEMBOTSKY ALEXANDER PROF

IPC: B03D1/012 ,  B03D1/006

Abstract: Ethyl N-(o-, m-, p-)sulphophenyl-thiocarbamates (IA) are new. Also claimed is the use of thiocarbamate esters of formula (I) as depressant for CuS in the sepn. of Mo and Cu minerals by froth flotation: R -O-C(=S)-NH-R (I); R = 1-6 C aliphatic hydrocarbyl gp., opt. with hydrophilic substit(s).; R = 1-6 C aliphatic hydrocarbyl or phenyl gp. with hydrophilic substit(s).

公开(公告)号：DE4040475A1

公开(公告)日：1991-07-04

申请号：DE4040475

申请日：1990-12-18

Applicant: HOECHST AG

Inventor： EDELMANN GERHARD DR ,  SCHIMMEL GUENTER DR ,  SVARA JUERGEN DR ,  ULRICHS KLAUS DR ,  WOLSTEIN FRIEDRICH DR

IPC: C07F9/165

Abstract: New dithiophosphoric acid esters of formula (I) (R(OC2H4)xO)2PS2M are claimed. R = branched 9-18C alk(en)yl; M = H, Na, K or NH4; x = 0-6 (0-4). (I) are used in pptn. and flotation of heavy metals from waste water. R = 9-18C alkyl with terminal branching. The amt. of (I) used is at least 2 (3-10) mols w.r.t. 1 mol of heavy metal cation. A foaming agent, esp. cetylmethylammonium bromide, may be added, or an anti-foam, esp. a sulphonic acid or an oil acid. ADVANTAGE - The esters are more stable in aq. soln. than the esters of linear alcohols; the solubility of the heavy metal complexes is much lower and their flotability is greater. The redn. in the content of heavy metals in waste water is above 95%.