Preparation of special cements from red mud
Preparation of special cements from red mud
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DOI：
10.1016/s0956-053x(97)00004-4
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发表时间：
1996
期刊：
影响因子：
8.1
通讯作者：
Maneesh Singh;S. Upadhayay;P. Prasad
中科院分区：
文献类型：
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作者：
Maneesh Singh;S. Upadhayay;P. Prasad
来自印度Renukoot的HINDALCO（印度斯坦铝业公司）工业有限公司的赤泥含有大量的氧化铝，氧化铁和二氧化硅。所述成分的存在使其成为制备特种水泥的合适成分。研究了三种水泥的制备方法：(a)石灰+赤泥+粉煤灰制备铝铁素体(C4AF)-白石（β-C2S）；(b)利用石灰+赤泥+铝土矿的铝铁氧体-铁氧体(C2F)-铝酸盐（C3A和C12A7）；(c)硫铝酸盐(C4A3S)-铝铁氧体-铁氧体，采用石灰+赤泥+铝土矿+石膏。详细研究了石灰、赤泥、粉煤灰、铝土矿和石膏的配比、煅烧温度和煅烧时间对水泥性能的影响。由石灰+赤泥+铝土矿或石灰+赤泥+铝土矿+石膏制成的水泥，其强度与普通波特兰水泥（OPC）相当或更好。另一方面，石灰+赤泥+粉煤灰配制的强度不够。此外，不可能用大量的粉煤灰（作为氧化铝的来源）代替铝土矿
Red mud from HINDALCO (Hindustan Aluminium Corporation) Industries Limited, Renukoot, India, contains significant quantities of alumina, iron oxide and silica. Presence of the said constituents makes it a suitable ingredient for the preparation of special cements. Preparation of three varieties of cements was investigated, namely: (a) aluminoferrite (C4AF)-belite (β-C2S) using lime + red mud + fly ash; (b) aluminoferrite-ferrite (C2F)-aluminates (C3A and C12A7) utilising lime + red mud + bauxite; and (c) sulfoaluminate (C4A3S̄)-aluminoferrite-ferrite using lime + red mud + bauxite + gypsum. The effects of composition (proportions of lime, red mud, fly ash, bauxite and gypsum), firing temperature and duration on the properties of cements produced were studied in detail. Cements made from lime + red mud + bauxite or lime + red mud + bauxite + gypsum exhibit strengths comparable or superior to ordinary Portland cement (OPC). On the other hand, those prepared using lime + red mud + fly ash did not have sufficient strength. Moreover, it was not possible to replace bauxite by fly ash (as a source of alumina) in any significant quantity.†