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Silica contained over 70%.The the color is lighter, with gray, the red meat often.Mainly of quartz, feldspar and a small quantity of the dark Muscovite and other black metal formation. Quartz content of 20%-40%, the alkali feldspar account for about two thirds of total size. Alkaline feldspar for all types of potash feldspar with sodium […]
Although in recent years each type of crusher whether in China or from technology production equipment is the improved, the speed of development is also very soon, aiming to international level dresses, but we also shall not admit the cone type in China and abroad or from a broken than there are some differences. From […]
The content of gold in the ore is very low, in order to extract the gold, you need to crush and grind ore and adopt mineral processing method for pre-enrichment or separating gold from ore, re-election and flotation method is used in gold mining, re-election method in placer gold production occupies an important position, the […]
The most expensive headphones today are priced at $20,000 and higher. As of the end of the year 2011, the most expensive headphone on the market was Sennheiser’s Orpheus, which was priced at $40,854.24 in the US and £30,000 in the UK. Although headphone aficionados do not anticipate a decrease in the price of this […]
