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：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.

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