â‘ Overview Ake Zhu season special (Acshugit) mine located north of the Mauritanian capital Nouakchott, ore reserves of about 30 million tons average ore grade of 2.5% copper oxide ore of which about 800 million tons of the ore body and some exposed The surface, some up to 30 meters deep. Copper oxide ore contains large amounts of copper minerals and closely connected raw hematite - chalcopyrite magnetite ore containing mainly the lower portion of magnetite ore and iron-containing carbonate minerals, mainly copper minerals. The mine is operated by the Omila Mining and Metallurgical Company, which includes capital from the United States, the United Kingdom and France. The plant was built in 1970 with a daily capacity of 4,000 tons of ore. The total infrastructure cost is $58 million, of which $20 million is for transportation infrastructure.
In three to four years early mine exploitation, mainly for copper oxide ore, copper average grade of 2.7%, with 3.1% Gold g / t. The ore cannot be sorted by ordinary beneficiation methods, and the segregation method can be effectively treated. In Zambia, he has conducted industrial trials using copper ore (500 tons/day). According to the test done by Zambia, he chose the dry grinding process and used a gas drop mill with a diameter of 6.7 meters for magnetite. The magnetic separation method can reduce the total processing capacity by 17%, while the copper loss is small. Magnetic separation can increase the grade of copper from 2.7% to 3.2%, and gold from 3.1 grams/ton to 3.6 grams/ton.
2 isolation - flotation process
In order to achieve roasting and segregation, four Dow Olivo-type boiling layer reactors with separation chambers were installed, each with a capacity of 900 tons. The non-magnetic portion is calcined at a temperature of 760 to 850 ° C, and then directly discharged into a vertical separation chamber where 2% of coal and 0.5% of salt are added to carry out an isolation reaction. The separated hot material is cooled by water and then floated, and the coarse particles are recovered in a cyclone, and re-milled before flotation, so that the gold reaches the monomer dissociation. The industrial test flotation concentrate contains more than 60% copper and 50 g/ton of gold. The flotation recovery rate of copper is 89-92%, and most of the silver enters the concentrate.
The plant has a low operating rate, with an average of 39.6% in 1972 and an average of 57.2% in 1973. The main reason is that the four series often only have three series of production, one series of overhaul. In addition, the mechanical equipment of the material system is often problematic before and after roasting, and the sand and high temperature climate in the desert area are seriously worn on mechanical equipment. Other transport pipes are often clogged, worn and corroded, and often cause downtime. Most of the equipment in the plant is imported. Due to the inability to arrive in time, the equipment is inspected and repaired, resulting in shutdown and waiting for production, so that production cannot be carried out normally.
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