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06/05/2013· ماشین سنگ زنی می بایست پس از هر 20 ساعت کار یا هر هفته یک بار بازرسی گردد. هنگام کار با سنگ، تمرکز خود را کاملا معطوف کار نموده و با دیگران صحبت نکنید و روی بر نگردانید. از سنگ خیس شده یا آغشته به دیگر مایعات استفاده نکنید. هنگام کار با سنگ فرز لازم است افرادی که اطراف شما هستند نیز از لوازم حفاظت چشم استفاده نمایند.
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مهمترین ماده معدنی حاوی کروم در طبیعت سنگ کرومیت به فرمول FeO.Cr2O3 است. کرومیت یک کانی بهصورت توده دانهای شکل است که کانههای تجاری آن حاوی ۶۸-۳۵ درصد اکسید کرومیت هستند. رنگ آن از سیاه قهوهای تا سیاه آهنی با جلای فلزی تغییر میکند و وزن مخصوص آن ۶/۴ گرم بر سانتیمترمکعب و سختی آن ۵/۵ است. کرومیت دارای نقطه ذوب ۲۱۳۰ درجه سیلسیوس است.
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