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زمانی که سنگهای معدنی از دل کوه استخراج میشوند لازم است به قطعات کوچکتر تبدیل شوند. به چند دلیل سنگ معدنی باید کوچکتر شود: 1. حملونقل آسان شود. 2. راحتتر در بازار خرید و فروش شوند. 3. کانیهای ارزشمند راحتتر استخراج شوند. همانگونه که به آن اشاره شد، تمام عمل خرد کردن به واسطه راحتی ادامه استفاده از سنگهای معدنی است. به این منظور از نیروی ...
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