公开(公告)号：DE4028239A1

公开(公告)日：1992-03-12

申请号：DE4028239

申请日：1990-09-06

Applicant: DEGUSSA

Inventor： DIEHL MANFRED DR ,  STEINER NORBERT DR ,  KNORRE HELMUT DR ,  KRONE ECKHARD DR ,  ZIMMER GERHARD DR

IPC: C02F1/20 ,  C22B11/08 ,  C23F11/16

Abstract: The use of formamidinesulphinic acid (I) as O2 binder is claimed. USE/ADVANTAGE - (I) is claimed for use as O2 binder in aq. alkaline soln., esp. in a cyanide lixiviation soln. contg. noble metal cyano complex, before pptn. of the noble metal by cementation with Zn. It is very effective at low temp.(e.g. room temp.) and in the absence of heavy metal catalysts. It can be used in strongly alkaline solns.. In an example, 1 l aq. soln. contg. 200 ppm NaCN, adjusted to pH 10.5 with CaO, was treated at 20 deg C with 500 mg of (A) Na2SO3, (B) Na2SO3 + 10 ppm Cu2+, (C) Na2SO3 + 50 ppm Cu2+, (D) N2H4, (E) ascorbic acid, (F) hydroquinone as O2 binder (controls) or with (I) in a concn. of (G) 0.1, (H) 0.2, (J) 0.3, (K) 0.5, (L) 1.0 g/l. The O2 content of the soln. was (A, B, H, J) 8.6, (C) 8.3, (D) 8.1, (E) 8.4, (F) 9.0, (G, K, L 8.8 ppm initially; (A) 8.2, (F) 5.8, (C) 0.2, (D) 8.0, (E) 8.1, (F) 0.9, (G) 8.7, (H) 7.5, (J) 6.8, (K) 5.9, (L) 4.9 ppm after 1 min; (A) 8.1, (B) 5.1, (C) 0, (D) 7.8, (E) 7.5, (F) 0.2, (G) 7.7, (H) 3.5, (J) 0.5, (K) 0.3, (L) 0.1 ppm after 3 min.; (A) 8.2, (B) 5.1, (D) 7.8, (E) 7.7, (F) 0, (G) 6.5, (H) 0.5, (J) 0.1, (K, L) 0 ppm; after 5 min.; (G) 3.1, (H, J) 0 ppm after 10 min.; and (G) 0 ppm after 15 min..

公开(公告)号：BR9101609A

公开(公告)日：1992-04-07

申请号：BR9101609

申请日：1991-04-22

Applicant: DEGUSSA

Inventor： DIEHL MANFRED DR ,  KONIG KARL-HEINZ DR ,  KRONE ECKHARD DR ,  LOROSCH JURGEN DR ,  STEINER NORBERT DR ,  ULLMANN JOCHEN

IPC: C22B11/08

公开(公告)号：DE59200379D1

公开(公告)日：1994-09-22

申请号：DE59200379

申请日：1992-02-26

Applicant: DEGUSSA

Inventor： STEINER NORBERT DR ,  GOS STEPHEN ,  LADWIG FRANK ,  DIEHL MANFRED DR

IPC: C02F1/58 ,  C02F1/72 ,  C02F9/00

Abstract: The invention relates to a process for detoxifying cyanide- and/or cyanocomplex-containing aqueous solutions in the presence of heavy metals from the series consisting of Mn, Co, Ni, Cu, Cd, Zn, in particular Cu, by oxidative treatment of the solutions with a peroxide compound at pHs of 8 to 12, the peroxide compound used being an alkali metal percarbonate. The alkali metal percarbonate, preferably 2 Na2CO3 . 3 H2O2, is preferably added in solid form to the solutions to be detoxified. The process according to the invention, with respect to the use of peroxide compound, is significantly more effective than the previously known process using hydrogen peroxide.

公开(公告)号：DE4116000A1

公开(公告)日：1992-11-19

申请号：DE4116000

申请日：1991-05-16

Applicant: DEGUSSA

Inventor： STEINER NORBERT DR ,  DIEHL MANFRED DR ,  PANSTER PETER DR ,  BERGSTEIN WOLFGANG DR ,  TRAGESER ANETTE ,  REINOSO BERND ADAM OVIEDO

IPC: B01J41/04 ,  B01J41/05 ,  C01G5/00 ,  C01G7/00

Abstract: The complexes are sepd. from the aq. systems by contacting with exchanger (I) based on polymeric crosslinked organosiloxane ammonium cpds. with silicic acid-like backbone. (I) comprises units of formula (1) (where R1, R2 = gp. of formula (2); where N atoms in unit of formula (1) are linked with Si atoms in gp. of formula (2) through gps. R6; R3 has same meaning as R1 or R2 = opt. branched 1-20C alkyl, 5-8C cycloalkyl, or benzyl.

公开(公告)号：AT110043T

公开(公告)日：1994-09-15

申请号：AT92103208

申请日：1992-02-26

Applicant: DEGUSSA

Inventor： STEINER NORBERT DR ,  GOS STEPHEN ,  LADWIG FRANK ,  DIEHL MANFRED DR

IPC: C02F1/58 ,  C02F1/72 ,  C02F9/00

Abstract: The invention relates to a process for detoxifying cyanide- and/or cyanocomplex-containing aqueous solutions in the presence of heavy metals from the series consisting of Mn, Co, Ni, Cu, Cd, Zn, in particular Cu, by oxidative treatment of the solutions with a peroxide compound at pHs of 8 to 12, the peroxide compound used being an alkali metal percarbonate. The alkali metal percarbonate, preferably 2 Na2CO3 . 3 H2O2, is preferably added in solid form to the solutions to be detoxified. The process according to the invention, with respect to the use of peroxide compound, is significantly more effective than the previously known process using hydrogen peroxide.

公开(公告)号：BR9201034A

公开(公告)日：1992-11-24

申请号：BR9201034

申请日：1992-03-25

Applicant: DEGUSSA

Inventor： STEINER NORBERT DR ,  GOS STEPHEN

IPC: C02F1/58 ,  C02F1/72 ,  C02F9/00 ,  C01B15/12 ,  C01B15/10 ,  C01B15/043

Abstract: The invention relates to a process for detoxifying cyanide- and/or cyanocomplex-containing aqueous solutions in the presence of heavy metals from the series consisting of Mn, Co, Ni, Cu, Cd, Zn, in particular Cu, by oxidative treatment of the solutions with a peroxide compound at pHs of 8 to 12, the peroxide compound used being an alkali metal percarbonate. The alkali metal percarbonate, preferably 2 Na2CO3 . 3 H2O2, is preferably added in solid form to the solutions to be detoxified. The process according to the invention, with respect to the use of peroxide compound, is significantly more effective than the previously known process using hydrogen peroxide.

公开(公告)号：DE4110055A1

公开(公告)日：1992-10-01

申请号：DE4110055

申请日：1991-03-27

Applicant: DEGUSSA

Inventor： STEINER NORBERT DR ,  GOS STEPHEN ,  LADWIG FRANK ,  DIEHL MANFRED DR

IPC: C02F1/58 ,  C02F1/72 ,  C02F9/00

Abstract: The invention relates to a process for detoxifying cyanide- and/or cyanocomplex-containing aqueous solutions in the presence of heavy metals from the series consisting of Mn, Co, Ni, Cu, Cd, Zn, in particular Cu, by oxidative treatment of the solutions with a peroxide compound at pHs of 8 to 12, the peroxide compound used being an alkali metal percarbonate. The alkali metal percarbonate, preferably 2 Na2CO3 . 3 H2O2, is preferably added in solid form to the solutions to be detoxified. The process according to the invention, with respect to the use of peroxide compound, is significantly more effective than the previously known process using hydrogen peroxide.

公开(公告)号：DE4028240A1

公开(公告)日：1992-03-12

申请号：DE4028240

申请日：1990-09-06

Applicant: DEGUSSA

Inventor： DIEHL MANFRED DR ,  STEINER NORBERT DR ,  KNORRE HELMUT DR ,  KRONE ECKHARD DR ,  ZIMMER GERHARD DR

IPC: C22B11/08

Abstract: Removal of O2 from cyanide lixiviation soln. contg. noble metal before noble metal cementation with Zn involves reducing dissolved O2 at pH 9-14 by adding 1-5 times the stoichiometric amt. of O2 binder (I) for quantitative redn. of O2 and, if necessary, an effective amt. of heavy metal catalyst (II) to an O2 content of under 1 ppm. Pref. (I) is a soluble sulphite, whilst (II) is Mn, Fe, Co, Ni or Cu ions, pref. in a concn. of at least 20, esp. 25-100 ppm, partic. Cu ions from a Cu(II) salt in a concn. of at least 25, pref. 25-100, esp. 50-100 ppm. In this case, removal of O2 is carried out at pH 10-12. Alternatively, (I) is formamidinesulphinic acid or hydroquinone. Part of the O2 pref. is removed first by degassing or displacement with an inert gas. Treatment is carried out until the O2 content is zero, measured with an O2 electrode. ADVANTAGE - The noble metal yield is increased and the Zn consumption reduced, making the process more economical.