L copper and cobalt mine in central Africa across the continent in the Democratic Republic of the Congo (referred to as "the Congo (DRC)") on and Zambia "African Copperbelt" test ore samples around 2.28% copper, 1.25% cobalt, copper and cobalt minerals The oxidation rate is high and the occurrence state is complicated. Copper oxide was mainly malachite, cobalt minerals present in the form of aqueous cobalt ore, a small part of the cobalt into the limonite ore mineral mechanically mixing and adsorption of formula forms part of the copper, cobalt mineral disseminated grain size small, dissociation grinding Difficulties, the ore sample contains a certain amount of talc , mica , and other layered silicate minerals. These minerals are extremely buoyant and will compete with the target mineral for adsorption. The consumption of flotation reagents must be removed beforehand.
A lot of research work has been carried out for the L-copper-cobalt ore. The experimental research has carried out a series of flotation closed-circuit tests and floating-magnetic joint tests. The final recommended process flow is a floating-magnetic joint process. Finally, the recommended process uses polyether alcohol as a foaming agent to remove minerals such as mica and talc, which have a great influence on flotation, and then use vulcanizing agent sodium sulfide, activator YSA, collector medicinal agent and foaming agent. Ether alcohol, three-stage coarse flotation of copper oxide and cobalt minerals, the obtained copper-cobalt-cobalt concentrate is once selected to obtain copper oxide cobalt concentrate, selected medium ore as copper oxide cobalt concentrate 2; three-stage copper oxide cobalt The coarsely selected tailings and the removed mica and talc are combined for high gradient strong magnetic separation to obtain magnetic separation concentrate and magnetic separation tailings.
The fineness of the ore sample reaches 69%-0.074mm in a grinding process. The process is to remove mica and talc in advance by polyether alcohol, and then use the flotation flotation method. The flotation agent is sodium sulfide, YSA, amyl yellow drug. Floatation of easy-floating oxidized ore, obtaining high-grade copper oxide and cobalt concentrate, mica talc and flotation tailings combined for high-gradient magnetic separation, obtaining low-grade copper oxide and cobalt concentrate, achieving maximum recovery of copper-cobalt minerals the goal of.
The test beneficiation index is excellent, the total copper recovery rate is 91.18%, the total cobalt recovery rate is 90.45%, the concentrate yield is 8.69%, the total copper concentrate grade is 23.89%, and the cobalt concentrate grade is 12.93%.
The test beneficiation process is shown in the figure below, and the test results are shown in the table below.
Test sample single product program test results (%)
product name | Yield | grade | Recovery rate | ||
Cu | Co | Cu | Co | ||
Total concentrate | 8.69 | 23.89 | 12.93 | 91.18 | 90.45 |
Tailings | 91.31 | 0.22 | 0.13 | 8.82 | 9.55 |
Raw ore | 100.0 | 2.28 | 1.24 | 100.00 | 100.00 |
Smelting experts suggest that if the high-grade copper concentrate (copper grade greater than 35%) and high-grade cobalt concentrate (cobalt concentrate grade greater than 20%) can be obtained by optimizing the process, the smelting investment and operating costs can be significantly reduced. Therefore, the exploration of improving the grade of concentrates has been carried out. From the analysis of the experimental data in 2014, the improvement of concentrate grade can be achieved through two methods: flotation selection and magnetic separation. Flotation coarse concentrates have obtained high-grade copper concentrates through flotation and magnetic separation, respectively, and the recovery efficiency is close.
product name | Yield | grade | Recovery rate | ||
Cu | Co | Cu | Co | ||
Flotation concentrate | 2.64 | 41.22 | 11.28 | 48.47 | 23.05 |
Magnetic separation concentrate | 11.05 | 9.14 | 8.06 | 44.99 | 68.93 |
Tailings | 86.31 | 0.17 | 0.12 | 6.54 | 8.02 |
Raw ore | 100.0 | 2.24 | 1.29 | 100.00 | 100.00 |
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