黄河淤沙配料对水泥熟料煅烧及性能影响的研究

发布时间：2018-03-26 20:45

  本文选题：黄河淤沙　切入点：配料　出处：《济南大学》2015年硕士论文

【摘要】：结合水泥厂生产实际,选用黄河淤沙作为硅质原料烧制硅酸盐水泥熟料,研究了不同率值、不同矿化剂种类及掺量以及不同煅烧温度下,黄河淤沙配料对水泥熟料煅烧及性能的影响。研究结果表明:采用黄河淤沙配料,由于黄河淤沙中Si O2的结晶程度较高,造成生料的易烧性较差,烧制的熟料中f-CaO含量比砂岩配料的高,初凝时间及终凝时间明显延长,各龄期强度降低;适当提高KH值,熟料中f-CaO含量增大,而水泥的凝结时间缩短,水泥各龄期的强度提高。适当提高SM值,熟料的液相量减少,在一定程度上影响了熟料矿物的形成,造成熟料中f-CaO含量相应增大,而水泥的凝结时间缩短,水泥的强度总体上有增大的趋势;当SM偏高(如达3.0)时,液相量偏低,对水泥后期强度不利。适当提高IM值,熟料的液相黏度增大,熟料中f-CaO的含量也出现不同程度的增大,生料的易烧性变差,但熟料中C3A含量增多,水泥强度成上升趋势;当IM达1.8时,水泥强度增长已不明显。在配制水泥生料过程中加入适量脱硫石膏作为矿化剂,并且适当提高脱硫石膏的加入量,熟料中f-CaO含量逐渐降低,水泥的凝结时间逐渐缩短,水泥各龄期的强度逐渐提高;与未加入脱硫石膏的试样对比,水泥的各龄期强度大幅提高;当外加脱硫石膏带入的SO3含量为2.0%时,水泥试样具有较高的早期强度;当SO3含量为2.5%时,水泥试样的后期强度较高。分别在1450℃,1470℃温度下煅烧水泥熟料。研究发现,煅烧温度升高,水泥熟料中f-CaO含量降低,熟料中生成的C3S等矿物含量升高,凝结时间缩短,水泥试样各龄期强度逐渐增大。
[Abstract]:Combined with the production practice of cement plant, the Yellow River silt was selected as the siliceous raw material to burn Portland cement clinker, and the different rate value, different mineralizing agent type and amount and different calcination temperature were studied. Influence of Yellow River silt proportioning on the calcination and properties of cement clinker. The results show that the raw material is poor in burnability due to the high crystalline degree of Sio 2 in the Yellow River silt. The content of f-CaO in clinker is higher than that in sand, the initial setting time and final setting time are obviously prolonged, the strength of each age is decreased, the content of f-CaO in clinker is increased and the setting time of cement is shortened with the appropriate increase of KH value. The strength of cement at different ages is improved. When the SM value is raised properly, the liquid content of clinker decreases, which to some extent affects the formation of clinker minerals, resulting in the increase of f-CaO content in clinker and the shortening of setting time of cement. The strength of cement has a tendency to increase generally, when SM is on the high side (e.g. 3.0), the liquid phase content is low, which is disadvantageous to the later strength of cement. When the IM value is raised properly, the liquid phase viscosity of clinker increases, and the content of f-CaO in clinker increases in varying degrees. The burnability of raw material is poor, but the content of C3A in clinker is increasing, and the strength of cement is on the rise. When IM reaches 1.8, the strength of cement has not increased obviously. In the process of preparing raw cement, the suitable amount of desulphurized gypsum is added as mineralizer. By increasing the amount of desulphurized gypsum properly, the content of f-CaO in clinker decreases gradually, the setting time of cement is shortened, and the strength of cement at different ages is gradually increased, which is compared with the sample without desulphurization gypsum. The strength of cement at different ages is greatly increased; when the SO3 content brought in by desulphurization gypsum is 2.0, the cement sample has higher early strength; when the SO3 content is 2.5, The later strength of cement sample is higher. The cement clinker is calcined at 1450 鈩，

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