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鐵精粉是如何劃分酸堿性 干濕基的對比價格
新聞網 09-26 17:16

鐵精粉(包括鐵礦)的酸堿性是指礦中脈石成分的酸堿度,具體是指氧化鈣與二氧化硅的比值,CaO/SiO2大于1則為堿性礦,CaO/SiO2小于1則為酸性礦。如果礦中氧化鎂、氧化鋁含量較高,也有將(CaO+MgO/SiO2+Al2O3)大于1作為堿性礦,反之則為酸性礦。

鐵精粉的酸堿度與高爐的煉鐵指標有關,如果高爐采用堿性渣熔煉(為了更好地脫硫)則希望使用堿性礦;如果高爐采用酸性渣熔煉(為了提高高爐利用系數和降低焦耗)則希望使用酸性礦。目前國內高爐一般使用堿性礦,即希望鐵礦的堿度(CaO/SiO2的數值)高一些。

濕基價格是指含有水分的噸價,干基是指除掉水分后的噸價,顯然1噸濕的鐵精粉除掉水分后得不到1噸干的鐵精粉,其差數就是水分的重量。干的鐵精粉噸價高于濕的鐵精粉噸價,其簡單的計算公式就是:濕基噸價/1-含水量%=干基噸價,當然濕基鐵精粉含水量必須達到用戶的標準,如果含水量超標,用戶會提出烘干水分的費用問題或干脆拒收。

河北省鋼鐵PMI指數

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