nbsp018332when zinc demand increased during world war ii us smelters turned to foreign zinc ore us smelted zinc reached a high of 926000 tonnes in 1970 then dropped as smelters closed there were 12 primary zinc smelters in 1970 but only seven in 1980 three in 1990 and two in 2000...
nbsp018332jaw crusher also known as concrete crusher is usually used as the primary equipment for concrete crushing it is also suitable for metallurgy mining construction chemical water conservancy and railway sectors and used as a device for fine and medium crushing of ores and rocks with compressive strength below 250 mpa...
nbsp018332jaw crusher is usually used for primary crushing and cone crusher is used for secondary crushing the material of crusher plays an important role in its working efficiency and service life however the regular operation and maintenance are important too...
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