生料中矿物类型和粒度对熟料游离氧化钙含量及其岩相结构影响的实验研究

发布时间：2018-09-11 14:24

【摘要】：本文主要针对生料中的矿物种类和颗粒度两个因素对生料的易烧性和熟料岩相结构的相关性进行研究。试验是在相同率值条件下,通过制备含有不同矿物组成、不同粒径的矿物的生料,在1350℃和140℃下煅烧熟料。采用化学分析、激光粒度分析、X射线衍射法、岩相分析等方法分别测试原料的化学组成、生料的粒度、熟料的游离氧化钙含量和熟料的岩相结构,研究了生料中高岭石和蒙脱石相互取代条件下生料的易烧性和岩相结构特征进行了对比研究,并对生料中粗颗粒的石英和方解石矿物及其熟料变化对s生料易烧性和岩相结构的影响进行了研究分析。实验研究结果表明： 1)对于硅质原料中的主要矿物,高岭石、蒙脱石等粘土矿物相对于石英,具有较好的易烧性,取代生料中的石英越多,对改善生料的易烧性越有利。如1400℃下,含有高岭石和蒙脱石等粘土矿物的生料煅烧所得的熟料中的游离氧化钙含量低于0.60%。,而采用粒径小于80μm石英和粒径小于45μm的α—Al2O3配料的熟料中的游离氧化钙含量为1.96%。 2)同样率值条件下,在掺入相同比例的粗颗粒石英(为了消除率值和其余矿物颗粒尺寸的影响,配料中差额部分的石英粒径小于45μm时,与蒙脱石配料的生料煅烧所得的熟料相比,高岭石配料的生料煅烧所得的熟料的游离氧化钙较少,气孔率较小,烧结密度相对较大,大约大30%。 3)相同粒度条件下,石英的对生料易烧性的影响明显大于方解石的影响。如：80μm方解石筛余量增加1%,游离氧化钙含量就增加0.04-0.06%。而80μm石英筛余量增加1%,游离氧化钙含量就增加0.34%-1.90%,是方解石的8-30倍。200μm方解石筛余量增加0.5%,游离氧化钙含量就增加0.19～0.55%。而200μm石英筛余量每增加0.5%,游离氧化钙含量就增加0.31%-1.66%,是方解石的2～3倍。粗颗粒方解石和石英均能引起游离氧化钙的产生,但在岩相上的形式不同。方解石主要引起游离氧化钙矿巢,矿巢尺寸与方解石粒径相比略小；石英主要形成环状分布的B矿巢,导致生料局部饱和比过高而形成分散在A矿间的分散式游离氧化钙。 4)对实际生产的生料的煅烧研究结果表明：当生料中含有较多的高岭土时,对应需要掺入更多的高硅砂岩才能配制出符合硅率要求的生料。高硅砂岩中的石英难以粉磨,生料中含有较多的石英粗颗粒,导致含石英矿物较多、且粒度较粗的这一类生料煅烧所得的熟料,其游离氧化钙含量较多,在岩相上可以观察到尺寸较大的环状分布的B矿巢和游离氧化钙矿巢。粗颗粒少且石英含量少的生料,煅烧所得的熟料中的游离氧化钙含量较少,在岩相上观察到少量的环状分布的B矿巢。 5)在对实际生产生料进行再次粉磨,使得生料中粗颗粒的尺寸得以减小后,煅烧所得的熟料的游离氧化钙含量大幅下降,下降幅度为3-7%,另外,环状分布的B矿和游离氧化钙矿巢数目和尺寸明显下降,熟料中矿物分布更均匀。生料80μm筛余降低到11-13%时,1350℃下煅烧所得的熟料的游离氧化钙含量比80μm筛余为14～15%的生料在1400℃下煅烧所得的熟料的游离氧化钙含量要低,说明实际生料中颗粒尺寸对熟料中的游离氧化钙和岩相结构产生的影响要大于煅烧温度的影响。
[Abstract]:In this paper, the relationship between the burnability of raw meal and the clinker lithofacies structure is studied. Under the same rate, the clinker is calcined at 1350 C and 140 C by preparing raw meal with different mineral composition and different particle size. Degree analysis, X-ray diffraction and lithofacies analysis were used to measure the chemical composition of raw materials, the grain size of raw materials, the content of free calcium oxide in clinker and the lithofacies structure of clinker. The burnability and lithofacies structure characteristics of raw materials were studied under the condition of replacement of kaolinite and montmorillonite in raw materials. The effects of quartz and calcite minerals and clinker on the burnability and lithofacies structure of s raw meal were studied.
1) For the main minerals in siliceous raw materials, clay minerals such as kaolinite and montmorillonite have better burnability than quartz. The more quartz in raw meal is replaced, the more favorable it is to improve the burnability of raw meal. For example, the content of free calcium oxide in clinker calcined by raw meal containing clay minerals such as kaolinite and montmorillonite is lower at 1400 ~C. The content of free calcium oxide in the clinker containing quartz with diameter less than 80 micron and a-Al2O3 with diameter less than 45 micron is 1.96%.
2) At the same rate, when the quartz particle size of the difference part of the mixture is less than 45 micron, the free calcium oxide of the clinker is less than that of the clinker calcined with montmorillonite raw meal, and the free calcium oxide of the clinker calcined with kaolinite raw meal is less than that of the clinker calcined with Montmorillonite raw meal. The porosity is relatively small, and the sintering density is relatively large, about 30%..
3) Under the same particle size, the influence of quartz on the burnability of raw meal is obviously greater than that of calcite. For example, the excess of 80-micron calcite sieve increases by 1%, the content of free calcium oxide increases by 0.04-0.06%, while the excess of 80-micron quartz sieve increases by 1%, the content of free calcium oxide increases by 0.34% -1.90%, which is 8-30 times of that of calcite. The content of free calcium oxide increases by 0.19-0.55% with 5% and 0.31-1.66% with each 0.5% increase in the residual of 200 micron quartz sieve, which is 2-3 times that of calcite. Both coarse-grained calcite and quartz can cause the formation of free calcium oxide, but in different petrographic forms. The grain size of quartz is a little smaller than that of calcite, and quartz mainly forms circular B-nest, which leads to high local saturation ratio of raw meal and the formation of dispersed free calcium oxide dispersed between A-ore.
4) The results of calcination of raw meal show that when raw meal contains more kaolin, more high-silica sandstone is needed to prepare raw meal which meets the requirement of silica ratio. The clinker calcined with this kind of raw meal has more free calcium oxide content, and larger circular distribution B ore nest and free calcium oxide ore nest can be observed in the lithofacies. Raw meal with less coarse particles and less quartz content has less free calcium oxide content in the clinker calcined, and a small amount of circular distribution can be observed in the lithofacies. The B mine nest.
5) After grinding raw meal again, the size of coarse particles in raw meal was reduced, the content of free calcium oxide in clinker decreased by 3-7%. In addition, the number and size of B ore and free calcium oxide nest in ring distribution decreased obviously, and the distribution of minerals in clinker was more uniform. When it is reduced to 11-13%, the free calcium oxide content of the clinker calcined at 1350 C is lower than that of the clinker calcined at 1400 C with 80_ m sieve and 14-15% raw meal. It shows that the influence of particle size on the free calcium oxide and rock structure in the clinker is greater than that of calcination temperature.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TQ172.1

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