Method for drying copper sulfide concentrates

Inactive Publication Date: 2010-05-06
FLSMIDTH AS
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Benefits of technology

[0007]In a first embodiment of the invention waste nitrogen from the oxygen plant is directed to a hot gas generator, in the presence of heated ambient air, thereby substantially reducing the oxygen content of the preheated ambient air in the hot gas generator. The oxygen depleted ambient air and the heated nitrogen gas are directed to a fluid bed or gas suspension device where they are mixed with and dry wet concentrate. The dried concentrate is carried out of the device with the spent nitrogen and ambient air and is collected for further treatment.
[0008]In another embodiment of the invention removing the oxygen source eliminates the possibility of concentrate combustion in the dryer. Waste nitrogen from the oxygen plant is directed to an air to gas heat exchanger. A hot gas generator fires the heat exchanger. However, the ambient air from the hot gas generator used as the heat transfer medium is directed to atmosphere and not into the drying device. Nitrogen preheated to significantly above the concentrate ignition temperature (260° C.) is directed to a fluid bed or gas suspension device where it is mixed with and dries incoming wet concentrate. The dried concentrate is carried out of the device with the spent nitrogen and collected for further treatment.
[0009]In a third

Problems solved by technology

However, the ambient air from the hot gas generator used as the heat tr

Method used

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  • Method for drying copper sulfide concentrates
  • Method for drying copper sulfide concentrates
  • Method for drying copper sulfide concentrates

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Embodiment Construction

[0016]It should be understood at the outset that identical reference numbers on the various drawing sheets refer to identical elements of the invention. It should also be understood that the following description is intended to completely describe the invention and to explain the best mode of practicing the invention known to the inventors but is not intended to be limiting in interpretation of the scope of the claims. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating principles of the invention.

[0017]Any conventional process can prepare the copper concentrates used in the practice of this invention, most preferably a flotation process, and such concentrates typically contain between about 10 and 50 percent by weight copper. The concentrates contain other metals, e.g. iron, lead, bismuth, arsenic, molybdenum, one or more precious metals. etc., that are associated with the copper in the ore deposit, and these metals, as well as the copper, are...

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Abstract

Dried copper concentrate is introduced to a smelter/converter that utilizes oxygen enrichment in the smelter/convert process. The copper concentrate was previously dried in a gas suspension or fluid bed dryer by contact with nitrogen gas that was a byproduct from the oxygen plants utilized to support the smelter.

Description

FIELD OF THE INVENTION[0001]This invention relates to the drying of copper concentrates in a gas suspension or fluid bed dryer. In one aspect, this invention relates to a process for the drying of copper concentrate that is both energy efficient and that reduces the possibility of concentrate combustion in the dryer.BACKGROUND OF THE INVENTION[0002]Present copper production from sulfide ores almost universally involves mining porphyry deposits composed mostly of chalcopyrite (Cu.FeS2). Raw ore is crushed and ground suitable for floatation concentration in which different materials are separated by agitating a pulverized mixture of the materials with water, oil, and chemicals. Differential wetting of the particles suspended during flotation causes unwetted particles to be carried by air bubbles to the surface for collection to produce a beneficiated ore containing about 25% copper and approximately equal portions of copper, iron, and sulfur. The concentrate is dewatered mechanically ...

Claims

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Application Information

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IPC IPC(8): C22B15/00C22B1/00
CPCC22B15/0006C22B15/0028
Inventor EUSTON, CHARLES R.
Owner FLSMIDTH AS
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