walnut-sized pieces. . grinding crushed ore is ball or rod-milled in large, rotating, cylindrical machines until it becomes a powder usually containing less than percent copper. sulfide ores are moved to a concentrating stage, while oxide ores are routed to leaching tanks. . concentrating minerals are concentrated...
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the leaves are laid out flat to dry, however, they will crumble somewhat and become known as tencha (碾茶). then, tencha may be deveined, destemmed, and stone-ground to the fine, bright green, talc-like powder known as matcha. [ ] [ ] grinding the leaves is a slow process, because the mill stones must not...
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