Method and arrangement for refining copper concentrate

Abstract

The invention relates to a method and to an arrangement for refining copper concentrate. The arrangement includes a suspension smelting furnace comprising a reaction shaft, and a settler. The reaction shaft is provided with a concentrate burner for feeding copper concentrate such as copper sulfide concentrate and/or copper matte and additionally at least reaction gas into the reaction shaft to obtain a blister layer containing blister and a first slag layer containing slag on top of the blister layer in the settler, and a slag cleaning furnace. The arrangement includes a feeder configured for feeding blister from the blister layer in the settler and for feeding slag from the first slag layer in the settler into the slag cleaning furnace.

Claims

1. A method for refining copper concentrate, wherein the method comprises using a suspension smelting furnace comprising a reaction shaft, and a settler, wherein the reaction shaft of the suspension smelting furnace is provided with a concentrate burner for feeding copper concentrate and additionally at least reaction gas into the reaction shaft of the suspension smelting furnace to obtain a blister layer containing blister and a first slag layer containing slag on top of the blister layer in the settler of the suspension smelting furnace, and using a slag cleaning furnace, and feeding copper concentrate and additionally at least reaction gas into the reaction shaft of the suspension smelting furnace to obtain a blister layer containing blister and a first slag layer containing slag on top of the blister layer in the settler of the suspension smelting furnace, and wherein the method comprises feeding slag from the first slag layer in the settler of the suspension smelting furnace and blister from the blister layer in the settler of the suspension smelting furnace from the suspension smelting furnace into the slag cleaning furnace, treating blister and slag in the slag cleaning furnace with a reduction agent to obtain a bottom metal layer containing bottom metal copper and a second slag layer containing slag on top of the bottom metal layer in the slag cleaning furnace, discharging bottom metal copper from the bottom metal layer in the slag cleaning furnace, and discharging slag from the second slag layer in the slag cleaning furnace.

2. The method according to claim 1, comprising feeding slag from the first slag layer in the settler of the suspension smelting furnace and blister from the blister layer in the settler of the suspension smelting furnace together from the suspension smelting furnace into the slag cleaning furnace.

3. The method according to claim 1, comprising feeding slag from the first slag layer in the settler of the suspension smelting furnace and blister from the blister layer in the settler of the suspension smelting furnace separately from the suspension smelting furnace into the slag cleaning furnace.

4. The method according to claim 1, comprising feeding slag from the first slag layer in the settler of the suspension smelting furnace and/or blister from the blister layer in the settler of the suspension smelting furnace from the suspension smelting furnace in batches into the slag cleaning furnace.

5. The method according to claim 1, comprising feeding slag from the first slag layer in the settler of the suspension smelting furnace and/or blister from the blister layer in the settler of the suspension smelting furnace from the suspension smelting furnace continuously into the slag cleaning furnace.

6. The method according to claim 1, comprising feeding bottom metal copper discharged from the bottom metal layer in the slag cleaning furnace to an anode furnace.

7. The method according to claim 1, comprising using an electric furnace as the slag cleaning furnace.

8. The method according to claim 1, comprising feeding copper concentrate and/or reaction gas into the reaction shaft so that the temperature of the blister fed from the blister layer in the settler of the suspension smelting furnace is between 1250 and 1400 C.

9. The method according to claim 1, comprising feeding copper concentrate and/or reaction gas into the reaction shaft so that the temperature of the slag fed from the first slag layer in the settler of the suspension smelting furnace is between 1250 and 1400 C.

10. The method according to claim 1, comprising feeding inert gas or inert gas mixture into the slag cleaning furnace.

11. The method according to claim 1, comprising feeding blister from blister layer in the settler of the suspension smelting furnace into the slag cleaning furnace without refining the blister fed from the blister layer in the settler of the suspension smelting furnace prior feeding the blister fed from the blister layer in the settler of the suspension smelting furnace into the slag cleaning furnace.

12. The method according to claim 1, comprising using an additional slag cleaning furnace in addition to the slag cleaning furnace, feeding slag from the slag cleaning furnace into the additional slag cleaning furnace, treating slag in the additional slag cleaning furnace with a reduction agent to obtain a bottom alloy layer containing bottom alloy and a waste slag layer containing waste slag, discharging bottom alloy from the bottom alloy layer in the additional slag cleaning furnace, and discharging waste slag from the waste slag layer in the additional slag cleaning furnace.

13. The method according to claim 12, comprising using an electric furnace as the additional slag cleaning furnace.

14. The method according to claim 1, wherein the copper concentrate being copper sulfide concentrate and/or copper matte.

15. An arrangement for refining copper concentrate, wherein the arrangement comprises a suspension smelting furnace comprising a reaction shaft, and a settle, wherein the reaction shaft of the suspension smelting furnace is provided with a concentrate burner for feeding copper concentrate and additionally at least reaction gas into the reaction shaft of the suspension smelting furnace to obtain a blister layer containing blister and a first slag layer containing slag on top of the blister layer in the settler of the suspension smelting furnace, and a slag cleaning furnace, wherein the arrangement comprises a feeder being configured for feeding blister from the blister layer in the settler of the suspension smelting furnace and configured for feeding slag from the first slag layer in the settler of the suspension smelting furnace from the suspension smelting furnace into the slag cleaning furnace, wherein the slag cleaning furnace being configured for treating blister and slag in the slag cleaning furnace with a reduction agent to obtain a bottom metal layer containing bottom metal copper and a second slag layer containing slag on top of the bottom metal layer in the slag cleaning furnace, wherein the arrangement comprises a bottom metal discharger configured for discharging bottom metal copper from the bottom metal layer in the slag cleaning furnace, and wherein the arrangement comprises a slag discharger configured for discharging slag from the second slag layer in the slag cleaning furnace.

16. The arrangement according to claim 15, wherein the feeder configured for feeding blister from the blister layer in the settler of the suspension smelting furnace and configured for feeding slag from the first slag layer in the settler of the suspension smelting furnace from the suspension smelting furnace into the slag cleaning furnace includes a separate first slag feeder configured for feeding separately slag from the first slag layer in the settler of the suspension smelting furnace from the suspension smelting furnace into the slag cleaning furnace.

17. The arrangement according to claim 16, wherein the separate first slag feeder configured for feeding slag from the first slag layer in the settler of the suspension smelting furnace into the slag cleaning furnace is configured for feeding slag from the first slag layer in the settler of the suspension smelting furnace into the slag cleaning furnace without refining the slag prior feeding the slag into the slag cleaning furnace.

18. The arrangement according to claim 15, wherein the feeder configured for feeding blister from the blister layer in the settler of the suspension smelting furnace and configured for feeding slag from the first slag layer in the settler of the suspension smelting furnace from the suspension smelting furnace into the slag cleaning furnace includes a separate feeder configured for feeding separately blister from the blister layer in the settler of the suspension smelting furnace from the suspension smelting furnace into the slag cleaning furnace.

19. The arrangement according to claim 18, wherein the separate blister feeder configured for feeding blister from the blister layer in the settler of the suspension smelting furnace into the slag cleaning furnace is configured for feeding blister from the blister layer in the settler of the suspension smelting furnace into the slag cleaning furnace without refining the blister prior feeding the blister into the slag cleaning furnace.

20. The arrangement according to claim 15, wherein the feeder configured for feeding blister from the blister layer in the settler of the suspension smelting furnace and configured for feeding slag from the first slag layer in the settler of the suspension smelting furnace from the suspension smelting furnace into the slag cleaning furnace includes a combined slag and blister feeder configured for feeding slag from the first slag layer in the settler of the suspension smelting furnace from the suspension smelting furnace together with blister from the blister layer in the settler of the suspension smelting furnace from the suspension smelting furnace into the slag cleaning furnace.

21. The arrangement according to claim 20, wherein the combined slag and blister feeder configured for feeding slag from the first slag layer in the settler of the suspension smelting furnace from the suspension smelting furnace together with blister from the blister layer in the settler of the suspension smelting furnace from the suspension smelting furnace into the slag cleaning furnace is configured for feeding slag from the first slag layer in the settler of the suspension smelting furnace from the suspension smelting furnace together with blister from the blister layer in the settler of the suspension smelting furnace from the suspension smelting furnace into the slag cleaning furnace without refining the slag and the blister prior feeding the slag and the blister into the slag cleaning furnace.

22. The arrangement according to claim 15 wherein the feeder being configured for feeding slag from the first slag layer in the settler of the suspension smelting furnace and/or blister from the blister layer in the settler of the suspension smelting furnace from the suspension smelting furnace in batches into the slag cleaning furnace.

23. The arrangement according to claim 15, wherein the feeder being configured for feeding slag from the first slag layer in the settler of the suspension smelting furnace and/or blister from the blister layer in the settler of the suspension smelting furnace from the suspension smelting furnace continuously into the slag cleaning furnace.

24. The arrangement according to claim 15, wherein the bottom metal discharger configured for discharging bottom metal copper from the bottom metal layer in the slag cleaning furnace being connected with a bottom metal feeder configured for feeding bottom metal copper to an anode furnace.

25. The arrangement according to claim 15, wherein the slag cleaning furnace is an electrical cleaning furnace.

26. The arrangement according to claim 15, comprising gas feeder configured for feeding inert gas or inert gas mixture into the slag cleaning furnace.

27. The arrangement according to claim 15, comprising an additional slag cleaning furnace in addition to the slag cleaning furnace, and comprising a second slag feeder configured for feeding slag from the slag cleaning furnace into the additional slag cleaning furnace, wherein the additional slag cleaning furnace being configured for treating slag in the additional slag cleaning furnace with a reduction agent to obtain a bottom alloy layer containing bottom alloy and a waste slag layer containing waste slag, comprising an additional bottom metal discharger configured for discharging bottom alloy from the bottom alloy layer in the additional slag cleaning furnace, and comprising an additional waste slag discharger configured for discharging waste slag from the waste slag layer in the additional slag cleaning furnace.

28. The arrangement according to claim 27, wherein the additional slag cleaning furnace being an electric furnace.

29. The arrangement according to claim 15, wherein the copper concentrate being copper sulfide concentrate and/or copper matte.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) In the following the invention will described in more detail by referring to the figures, which

(2) FIG. 1 shows an arrangement to the prior art,

(3) FIG. 2 shows a first embodiment of the arrangement,

(4) FIG. 3 shows a second embodiment of the arrangement,

(5) FIG. 4 shows a third embodiment of the arrangement, and

(6) FIG. 5 shows a fourth embodiment of the arrangement.

DETAILED DESCRIPTION OF THE INVENTION

(7) The invention relates to a method and to an arrangement for refining copper concentrate 1.

(8) First the method refining copper concentrate 1 and preferred embodiments and variants thereof will be described in greater detail.

(9) The method comprises using a suspension smelting furnace 2 comprising a reaction shaft 5, a settler 6, and preferably, but not necessarily, an uptake 7.

(10) The reaction shaft 5 of the suspension smelting furnace 2 is provided with a concentrate burner 8 for feeding copper concentrate 1 such as copper sulfide concentrate and/or copper matte and additionally at least reaction gas 9, and preferable also flux 10, into the reaction shaft 5 of the suspension smelting furnace 2 to obtain a blister layer 11 containing blister and a first slag layer 12 containing slag on top of the blister layer 11 in the settler 6 of the suspension smelting furnace 2.

(11) The method comprises additionally using a slag cleaning furnace 3. The method comprises preferably using an electric furnace as the slag cleaning furnace 3.

(12) The method comprises a step for feeding copper concentrate 1 such as copper sulfide concentrate and/or copper matte and additionally at least reaction gas 9, and preferable also flux 10, into the reaction shaft 5 of the suspension smelting furnace 2 to obtain a blister layer 11 containing blister and a first slag layer 12 containing slag on top of the blister layer 11 in the settler 6 of the suspension smelting furnace 2.

(13) The method comprises additionally a step for feeding slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 into the slag cleaning furnace 3 and for feeding blister from blister layer 11 in the settler 6 of the suspension smelting furnace 2 into the slag cleaning furnace 3.

(14) The method comprises additionally a step for treating blister and slag in the slag cleaning furnace 3 with a reduction agent 16 such as coke to obtain a bottom metal layer 14 containing bottom metal copper and a second slag layer 15 containing slag on top of the bottom metal layer 14 in the slag cleaning furnace 3. In this step copper present in the slag fed from the first slag layer 12 in the suspension smelting furnace 2 moves from the second slag layer 15 to the bottom metal layer 14. The method comprises additionally a step for discharging bottom metal copper from the bottom metal layer 14 in the slag cleaning furnace 3.

(15) The method comprises additionally a step for discharging slag 21 from the second slag layer 15 in the slag cleaning furnace 3.

(16) In the method slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 and blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 may be fed together from the suspension smelting furnace 2 into the slag cleaning furnace 3, as shown in FIGS. 2 and 5. Alternatively, slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 and blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 may be fed separately from the suspension smelting furnace 2 into the slag cleaning furnace 3 as shown in FIGS. 3 and 4.

(17) In the method, slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 and/or blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 2 may be fed in batches into the slag cleaning furnace 3. Alternatively, slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 and/or blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 2 may be fed continuously into the slag cleaning furnace 3. By using continuous feeding, feeding means 16, 18, 23 for feeding blister from the blister layer 12 in the settler 6 of the suspension smelting furnace 2 and for feeding slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 into the slag cleaning furnace 3 are easier to keep open.

(18) The method comprises preferably, but not necessarily, a step for feeding bottom metal copper discharged from the bottom metal layer 14 in the slag cleaning furnace 3 to an anode furnace 4.

(19) The method comprises preferably, but not necessarily, feeding copper concentrate 1 such as copper sulfide concentrate and/or copper matte and/or reaction gas 9 into the reaction shaft 5 of the suspension smelting furnace 2 so that the temperature of the blister fed from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 is between 1250 and 1400 C.

(20) The method comprises preferably, but not necessarily, feeding copper concentrate 1 such as copper sulfide concentrate and/or copper matte and/or reaction gas 9 into the reaction shaft 5 of the suspension smelting furnace 2 so that the temperature of the slag fed from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 is between 1250 and 1400 C.

(21) The method comprises preferably, but not necessarily, feeding inert gas or inert gas mixture into the slag cleaning furnace.

(22) The method comprises preferably, but not necessarily, feeding blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 into the slag cleaning furnace 3 without refining the blister fed from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 prior feeding the blister fed from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 into the slag cleaning furnace 3.

(23) The method may in some embodiments, as shown in FIGS. 4 and 5, include using an additional slag cleaning furnace 24 in addition to the slag cleaning furnace 3. These embodiments of the method includes a step for feeding slag 21 from the slag cleaning furnace 3 into the additional slag cleaning furnace 24 and a step for treating slag 21 in the additional slag cleaning furnace 24 with a reduction agent 13 to obtain a bottom alloy layer 25 containing bottom alloy 30 and a waste slag layer 26 containing waste slag 27. These embodiments of the method includes a step for discharging bottom alloy 30 from the bottom alloy layer 25 in the additional slag cleaning furnace 24, and a step for discharging waste slag 27 from the waste slag layer 26 in the additional slag cleaning furnace 24. An electric furnace may be used as the additional slag cleaning furnace 24.

(24) Next the arrangement for refining copper concentrate 1 and preferred embodiments and variants thereof will be described in greater detail.

(25) The arrangement comprises a suspension smelting furnace 2 comprising a reaction shaft 5, a settler 6, and preferably, but not necessarily, an uptake 7.

(26) The reaction shaft 5 of the suspension smelting furnace 2 is provided with a concentrate burner 8 for feeding copper concentrate 1 such as copper sulfide concentrate and/or copper matte and additionally at least reaction gas 9 and preferably also flux 11 into the reaction shaft 5 of the suspension smelting furnace 2 to obtain a blister layer 11 containing blister and a first slag layer 12 containing slag on top of the blister layer 11 in the settler 6 of the suspension smelting furnace 2.

(27) The arrangement comprises additionally a slag cleaning furnace 3, which preferably, but not necessarily, is in the form of an electric furnace.

(28) The arrangement comprises additionally feeding means 16, 18, 23 for feeding blister from the blister layer 12 in the settler 6 of the suspension smelting furnace 2 and for feeding slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 into the slag cleaning furnace 3.

(29) The slag cleaning furnace 3 is configured for treating blister and slag in the slag cleaning furnace 3 with a reduction agent 13 to obtain a bottom metal layer 14 containing bottom metal copper and a second slag layer 15 containing slag 21 on top of the bottom metal layer 14 in the slag cleaning furnace 3. In the slag cleaning furnace 3 copper present in the slag fed from the first slag layer 12 in the suspension smelting furnace 2 moves from the second slag layer 15 to the bottom metal layer 14.

(30) The arrangement comprises additionally bottom metal discharging means 22 for discharging bottom metal copper from the bottom metal layer 14 in the slag cleaning furnace 3.

(31) The arrangement comprises additionally slag discharging means 20 for discharging slag 21 from the second slag layer 15 in the slag cleaning furnace 3. The feeding means 18, 19, 23 for feeding blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 and for feeding slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 3 into the slag cleaning furnace 3 may, as shown in FIGS. 3 and 4 include a separate first slag feeding means 16 for feeding separately slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 3 into the slag cleaning furnace 3. Such separate first slag feeding means 16 for feeding slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 into the slag cleaning furnace 3 may be configured for feeding slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 into the slag cleaning furnace 3 without refining the slag prior feeding the slag into the slag cleaning furnace 3.

(32) The feeding means 18, 19, 23 for feeding blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 and for feeding slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 3 into the slag cleaning furnace 3 may, as shown in FIGS. 3 and 4, include a separate blister feeding means 18 for feeding separately blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 3 into the slag cleaning furnace 3. Such separate blister feeding means 18 for feeding blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 into the slag cleaning furnace 3 may be configured for feeding blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 into the slag cleaning furnace 3 without refining the blister prior feeding the blister into the slag cleaning furnace 3.

(33) The feeding means 18, 19, 23 for feeding blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 and for feeding slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 3 into the slag cleaning furnace 3 may, as shown in FIGS. 2 and 5, include a combined slag and blister feeding means 23 for feeding slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 3 together with blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 3 into the slag cleaning furnace 3. Such combined slag and blister feeding means 23 for feeding slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 3 together with blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 3 into the slag cleaning furnace 3 may be configured for feeding slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 3 together with blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 3 into the slag cleaning furnace 3 without refining the slag and the blister prior feeding the slag and the blister into the slag cleaning furnace 3.

(34) The feeding means 16, 18, 23 may be configured for feeding slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 and/or blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 2 in batches into the slag cleaning furnace 3. Alternatively, the feeding means 16, 18, 23 may be configured for feeding slag from the first slag layer 12 in the settler 6 of the suspension smelting furnace 2 and/or blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 from the suspension smelting furnace 2 continuously into the slag cleaning furnace 3.

(35) The bottom metal discharging means 22 for discharging bottom metal copper from the bottom metal layer 14 in the slag cleaning furnace 3 is preferably, but not necessarily as shown in FIGS. 2 to 5, connected with bottom metal feeding means 19 for feeding bottom metal copper to an anode furnace 4.

(36) The arrangements shown in FIGS. 2 to 5 comprises additionally anode casting molds 17 for casting copper anodes which can be used in an electrolytic refining process for further reefing of the copper.

(37) The blister feeding means 18 for feeding blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 into the slag cleaning furnace 3 are preferably, but not necessarily, configured for feeding blister from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 into the slag cleaning furnace 3 without refining the blister fed from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 prior feeding the blister fed from the blister layer 11 in the settler 6 of the suspension smelting furnace 2 into the slag cleaning furnace 3.

(38) The arrangement may comprise by gas feeding means for feeding inert gas or inert gas mixture into the slag cleaning furnace 3.

(39) The arrangement may in some embodiments, as shown in FIGS. 4 and 5, comprise an additional slag cleaning furnace 24 in addition to the slag cleaning furnace 3 and second slag feeding means 31 for feeding slag 21 from the slag cleaning furnace 3 into the additional slag cleaning furnace 24 to reduce the copper content in the slag and to recover copper. In such embodiments, the additional slag cleaning furnace 24 is configured for treating slag 21 in the additional slag cleaning furnace 24 with a reduction agent 13 to obtain a bottom alloy layer 25 containing bottom alloy 30 and a waste slag layer 26 containing waste slag 27. In such embodiments, the arrangement comprises additional bottom metal discharging means 28 for discharging bottom alloy 30 from the bottom alloy layer 25 in the additional slag cleaning furnace 24, and additional waste slag discharging means 29 for discharging waste slag 27 from the waste slag layer 26 in the additional slag cleaning furnace 24. The additional slag cleaning furnace 24 may be an electrical furnace.

(40) It is apparent to a person skilled in the art that as technology advanced, the basic idea of the invention can be implemented in various ways. The invention and its embodiments are therefore not restricted to the above examples, but they may vary within the scope of the claims.

SEQUENCE LISTING

(41) Not Applicable.