Method and plant for processing roasted pyrites

Patent metadata

Field	Value
Publication number	US-2016083817-A1
Application number	US-201314891856-A
Country	US
Kind code	A1
Filing date	Jun 24, 2013
Priority date	May 17, 2013
Publication date	Mar 24, 2016
Grant date	—

Abstract

The invention relates to a method and a recovery system for obtaining raw materials from ores and/or ore tailings, in particular a method and a recovery system for recovering metals from ores and/or ore tailings, especially a method and a recovery system for recovering metals from pyrite tailings, preferably from roasted pyrites produced during sulphuric acid manufacture.

First claim

1 - 15 . (canceled)

16 . A method for obtaining metals from ores or ore residues in the form of pyrite residues,
wherein the method comprises the following method steps (a) to (e) carried out in the order indicated hereinafter: (a) providing and processing of a starting material in the form of at least one ore or ore residue, wherein the starting material comprises:
(i) iron as main constituent and
(ii) at least one noble metal selected from the group consisting of gold, silver and their combinations or mixtures, and
(iii) at least one further metal selected from the group consisting of copper, zinc, lead, cobalt, titanium, manganese, vanadium, chromium and their combinations or mixtures;
(b) an oxidation treatment comprising the step of calcining or oxidative roasting of the starting material provided in method step (a), using at least one oxidizing agent to give iron oxide and oxides of the further metals; (c) a chlorination of the oxidation products obtained in method step (b) by using at least one chlorinating agent, the chlorination comprising the chlorination of the iron oxide and of the oxides of the further metals to give iron chloride and chlorides of the further metals; (d) removing of the iron chloride and of the chlorides of the further metals obtained in method step (c) from the product mixture obtained in method step (c); (e) removing of the noble metal(s) from the product mixture obtained in method step (d); wherein in method step (c) the chlorination is carried out as a solid phase reaction and wherein in method step (c) a recyclable chlorinating agent is used, wherein the recyclable chlorinating agent used in method step (c) is recycled by recovery or removal of the reaction product(s) resulting from the chlorinating agent after the chlorination of the oxidation products and by subsequent reaction of these reaction products with a chlorine-containing compound and wherein the recycling of the chlorinating agent is carried out in a reaction- or condensation-device; and wherein the step of chlorination, carried out in method step (c), of the oxidation products obtained in method step (b), on the one hand, and the step of removing or isolating of the iron chloride, carried out in method step (d), on the other hand, both take place in a common device, wherein the common device has a first section for the implementation of method step (c) and a second section for the removing or isolating of the iron chloride.

17 . The method as claimed in claim 16 ,
wherein the starting material comprises the following ingredients, calculated in each case as element and based in each case on the dry weight of the starting material: iron in amounts in the range from 10 wt % to 75 wt; gold in amounts in the range from 0.1 g/t to 15 g/t; silver in amounts in the range from 1 g/t to 300 g/t.

18 . The method as claimed in claim 16 ,
wherein the starting material comprises the following ingredients, calculated in each case as element and based in each case on the dry weight of the starting material: copper in amounts in the range from 0.01 wt % to 5 wt %; zinc in amounts in the range from 0.02 wt % to 10 wt %; lead in amounts in the range from 0.01 wt % to 5 wt %; cobalt in amounts in the range from 0.001 wt % to 2 wt %; titanium in amounts in the range from 0.001 wt % to 2 wt %; manganese in amounts in the range from 0.001 wt % to 2 wt %; vanadium in amounts in the range from 0.001 wt % to 2 wt %; chromium in amounts in the range from 0.001 wt % to 2 wt %; silicon in amounts in the range from 0.5 wt % to 30 wt %.

19 . The method as claimed in claim 16 , wherein in method step (a) or before implementation of method step (b), the starting material is comminuted and homogenized.

20 . The method as claimed in claim 16 , wherein in method step (b) the oxidation treatment is carried out as a solid phase reaction and at temperatures in the range from 500° C. to 1000° C.

21 . The method as claimed in claim 16 ,
wherein, in the oxidation treatment in method step (b), iron is converted at least substantially completely into iron(III) oxide.

22 . The method as claimed in claim 16 ,
wherein the product mixture obtained in the oxidation treatment in method step (b) comprises iron(III) oxide in amounts in the range from 10 wt % to 95 wt %, based on the dry weight of the product mixture obtained in method step (b).

23 . The method as claimed in claim 16 ,
wherein in method step (c) the chlorination is carried out at temperatures in the range from 100° C. to 320° C.

24 . The method as claimed in claim 16 ,
wherein in method step (c) iron in the form of iron(III) oxide is reacted to give iron chloride.

25 . The method as claimed in claim 16 ,
wherein in method step (c) the at least one noble metal and the at least one further metal each in the form of their oxides are reacted to give the resulting chlorides.

26 . The method as claimed in claim 16 ,
wherein in method step (c) the chlorination is carried out using ammonium chloride NH 4 Cl as chlorinating agent.

27 . The method as claimed in claim 16 ,
wherein the chlorinating agent used in method step (c) in the form of ammonium chloride NH 4 Cl is recycled by recovery via subsequent reaction; and wherein the recycled chlorinating agent is subsequently used in method step (c).

28 . The method as claimed in claim 16 ,
wherein in method step (d) iron in the form of iron chloride is removed and isolated from the product mixture obtained in method step (c) via sublimation, followed by a subsequent reduction to give metallic iron or, alternatively, followed by a subsequent desublimation to give solid and purified iron chloride; and wherein in method step (d), after removing the iron chloride, a further subsequent removing and isolating of the chlorides of the further metals from the product mixture takes place.

29 . The method as claimed in claim 16 ,
wherein the product mixture obtained in method step (d), calculated in each case as element and based in each case on the dry weight of the product mixture, comprises gold in amounts in the range from 1 g/t to 50 g/t and silver in amounts in the range from 2 g/t to 600 g/t; and wherein in method step (e) the noble metals are removed from the product mixture received in a liquid medium.

30 . A recovery plant for recovering metals from ores or ore residues in the form of pyrite residues,
wherein the recovery plant comprises the following devices, which are arranged in the indicated order downstream of one another in the operating direction: (a) at least one providing and processing device for providing and processing a starting material in the form of at least one ore or ore residue, wherein the starting material comprises: (i) iron as main constituent, (ii) at least one noble metal selected from the group consisting of gold, silver and their combinations or mixtures, and (iii) at least one further metal, selected from the group of copper, zinc, lead, cobalt, titanium, manganese, vanadium, chromium and their combinations or mixtures; (b) at least one oxidation and roasting device for an oxidation treatment comprising a calcining and oxidative roasting of the provided starting material to give iron oxide and oxides of the further metals as oxidation products in the resulting product mixture; (c) at least one chlorinating device for the chlorination of the oxidation products present in the product mixture and for the use of at least one recyclable chlorinating agent for the chlorination of the iron oxide and of the oxides of the further metals to give iron ch

Assignees

• Bluecher Gmbh

Inventors

• Böhringer Bertram
• Schönfeld Raik
• Dyachenko Alexander
• Larin Valeriy

Classifications

• C22B3/20

  Treatment or purification of solutions, e.g. obtained by leaching (C22B3/18 takes precedence) · CPC title

• C22B11/06

  Chloridising · CPC title

• C22B11/04

  by wet processes (extraction of metal compounds by leaching in organic solutions C22B3/16; treatment or purification of solutions by liquid-liquid extraction C22B3/26) · CPC title

• C22B3/14

  containing ammonia or ammonium salts · CPC title

• C22B1/02

  Roasting processes (C22B1/16 takes precedence) · CPC title