Selective reduction of cupriferous calcine

Inactive Publication Date: 2005-09-08
INCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0006] A process for recovering copper from sulfide-containing material which contains, in addition to copper, at least one other metal selected from the group consisting of iron, nickel and cobalt, is provided which includes roasting said sulfide-containing material for sufficient time to provide a substantially sulfur-free cal

Problems solved by technology

Copper and nickel are close relatives in terms of dissolution thermodynamics and it has been difficult to efficiently separate nickel from copper during processing of ore and matte.
In the '217 patent process, the resulting calcine contains a significant amount of CuO in solid solution with

Method used

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  • Selective reduction of cupriferous calcine
  • Selective reduction of cupriferous calcine
  • Selective reduction of cupriferous calcine

Examples

Experimental program
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Effect test

example 1

[0020] Bessemer matte (Cu (40.7%), Ni (39.7%), Co (0.54%), Fe (0.91%) and S (18%)) was roasted in a 12 inch (30.4 cm) fluid bed. The calcine was used as feed for the reduction tests.

[0021] A 500-gram sample of calcine was charged to a 2 inch (5.1 cm) diameter mini plant fluid bed and heated to 1000° C. The CO2 / CO ratio was controlled at 1000 to affect a pO2 of about 10−8 (See FIG. 2). Fluidizing gas flow rates were 10 L / min N2, 25 L / min CO2 and 0.025 L / min CO. The conditions were maintained for 1 hour and the furnace heater was turned off. The material was allowed to cool rapidly with the gases on. A second reduction test was performed in order to determine the effect of a longer residence time during reduction. The test was conducted under the same conditions but for 2 hours.

[0022] Several bench-scale leaching tests were conducted on the two reduced samples. 25-gram samples of calcine in 250 mL of solution containing 180-g / L of sulfuric acid were utilized. In the first tests, H2O...

example 2

[0031] The effect of iron in a Cu—Ni—Fe system was evaluated. Three samples were tested: 1) Flash Furnace Matte (Cu-23%, Ni-22.6%, Co-0.664%, Fe-25.2%, S-26.7%), 2) Synthetic Matte (Cu-14.9%, Ni-16%, Co-0.435%, Fe-39.2%, S-29.4%), and 3) Bulk Cu—Ni Concentrate (Cu-12.1%, Ni-9.25%, Co-0.278%, Fe-37.5%, S-32.3%) Good separation of copper was achieved in each case. Table 4 summarizes the test results. The following procedure was used with respect to each sample:

[0032] The sample was melted and water granulated. About 2 kg of granulated sample was charged into a refractory pan and heated to ˜900° C. for ˜24 hours in an ambient air atmosphere to provide a roasted material. Fluid bed reduction was effected by first charging 1 kg of the roasted material into a 2 inch (5.1 cm) diameter fluid bed and heating to 1000° C. (external electrical elements) using air for fluidization at ˜45 slpm. The material was allowed to “re-roast” for 10 minutes at 1000° C. and then the air atmosphere was repl...

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Abstract

A process for selectively reducing calcine from a copper/nickel containing sulfidic material includes subjecting the calcine to a mildly reducing atmosphere at relative high temperatures. CuO is selectively converted to Cu2O which can easily be separated by leaching from other metals which may be present in the material.

Description

FIELD OF THE INVENTION [0001] The present disclosure relates to recovery of copper from sulfide materials which contain metals intimately mixed with the copper. It is particularly useful for the treatment of cupriferous mattes or fractions of such mattes. BACKGROUND OF THE INVENTION [0002] Copper and nickel are close relatives in terms of dissolution thermodynamics and it has been difficult to efficiently separate nickel from copper during processing of ore and matte. U.S. Pat. No. 4,168,217 (the “'217 patent”) describes a process for recovering copper from sulfidic material, e.g., a cupriferous matte or matte fraction (such as bessemer matte), containing at least one of the metals iron, nickel and cobalt, by dead-roasting the material at a temperature of at least about 750° C. to provide a calcine which is essentially sulfur-free, cooling the calcine and thereafter leaching it in an aqueous sulfuric acid solution at a temperature of at least about 50° C., and separating pregnant le...

Claims

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Application Information

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IPC IPC(8): C22B4/04C22B5/08C22B5/14C22B15/00C25C1/12
CPCC22B15/0015C22B15/0071C22B15/0065Y02P10/20C22B4/00C22B5/00C22B5/08C22B4/04
Inventor MUINONEN, MIKA ERKKI SANTERIMARCUSON, SAMEL WALTONVAHED, AHMEDWARNER, ANTHONY EDWARD MOLINE
Owner INCO
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