At present, copper beneficiation is facing the selection of ore grades, the amount of ore to be ore-alloyed is gradually increasing, the amount of composite ore and refractory ore is also increased, and the need for waste rock, waste residue and wastewater treatment are needed. To force copper beneficiation production and scientific research work to solve the technical problems encountered as soon as possible.
In recent years, although there has been no major breakthrough in foreign copper beneficiation technology , in order to adapt to the above situation, great progress has been made in the use of mineral processing technology, equipment, flotation reagents, automatic control and joint processes. Under the circumstances of resources and other conditions, the scale of new construction plants is large, the old factories are continuously expanded to increase scale, large-scale equipment is adopted, and the level of automation is high. This is the characteristic of the current foreign copper selection plants. The selection of raw ore grades has been reduced, and the expansion of large-scale mining and the selection of low-grade copper ore in the selection of plants is an important measure to increase copper production in the world today.
The grade of copper ore mined abroad has been gradually decreasing in recent decades, reaching 1,85% in the 1950s, 196. It was 1.33% in the year, 1.09% in 1970, and 0.9% in 1977. Therefore, large-scale mining of copper-poor mines is imperative. According to the US Bureau of Mines, the average grade of copper ore that can be mined is 190. The year was 4.0%, and in 1910 it was 1.88%, 192. It was 1.63% in the year, 1.20% in 1940, 0.89% in 1950, 0.73% in 1960, 0.60% in 1970, and 0.55% in 1980. Most of the large copper selection plants built by Guan in the 1970s were selected. Low, such as the West Yali Tower plant selected ore copper grade is only 0.32%, daily processing ore 90,000 tons.
With the reduction of the grade of ore selected, the scale of foreign copper-selecting plants is expanding. Taking the Pima Copper Concentrator in the United States as an example, the daily processing capacity in 1957 was 3,500 tons, and the original ore copper grade was 1.74%. In 1972, the copper grade of the ore was reduced. 0.55%, the daily processing capacity increased to 54,000 tons, an increase of 14 times. At present, the processing day of the factory has been expanded from 10,000 tons to more than 100,000 tons. Among the 25 copper flotation plants in the United States, there are 6 s 2.5-5 million tons with a capacity of more than 50,000 tons, 5 with 1-2 million tons, and 5 with 0.5 million tons. The daily processing capacity of the world's large female copper ore Chugui mine will be expanded from the current 85,000 tons to 160,000 tons. The second half of 1979 put into operation拉å¡é‡Œè¾¾ç‰¹(Lacarided) copper processing plant, ore daily processing 72,000 tons annual output of 180,000 tons of copper metal.
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