The extra siliceous limestone sample of the Lower Eocene from the abandoned cement quarry part of the limestone deposit from the area of Bizerte (Extreme North East of Tunisia) has been investigated for its suitability for cement making. Petrological as well as X-ray diffraction pattern studies indicated that the limestone sample was crystalline and dominantly composed of calcite and quartz. They have variable silica and lime contents. Geochemical analysis results of 25 samples indicated that the limestone from the Bizerte deposit shows a wide range of variation in LOI (33–39 wt%), SiO₂ (7–6 wt%), CaO (4–49 wt%) Al₂O₃ (2–4 wt%), and Fe₂O₃ (0.74–1.45 wt%). MgO, K₂O, Na₂O, and TiO₂ are present in traces. CaO shows a strong positive correlation with LOI, whereas CaO and SiO₂ show a negative correlation. The chemical composition of limestone confirms the mineralogical composition. The aim of this paper is to show the influence of high siliceous limestone component from Bizerte deposit on clinker parameters (silica modulus and lime saturation factor) in order to highlight their effect for the cement process making. In addition, to establish a predictionnal geochemical model in order to integrate and optimize this raw material estimated at 81,78,000 tons in cement manufacturing. The geochemical analysis by XRF of the limestone samples taken at different levels from the quarry proves their affluence in carbonate with a lime content of 46 wt% and the abundance of silica with a content of 12 wt%. Mineralogical analysis shows the predominance of calcite and quartz at the XRD diffraction patterns. The obtained results are used subsequently to establish geochemical maps of lime and silica allowing the orientation of the operational plan according to the geochemical quarry composition. The geochemical as well as mineralogical analyses show that the integration of the extra siliceous limestone in the raw powder composition permits the filling in of the defect of silica in limestone exploitation by preserving the quality of the produced cement in accordance with the Tunisian and European standard requirements. This study explains then the importance of geochemical assessment of limestone for cement manufacturing.

中文翻译：

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下始新世硅质石灰石在水泥生产中的地球化学适应性（比塞大矿床-突尼斯北部）

研究了比塞大（突尼斯东北部极端地区）的石灰岩矿床废弃水泥采石场部分的下始新世的硅质石灰岩样品的适用性。岩石学和X射线衍射图谱研究表明，石灰石样品为晶体，主要由方解石和石英组成。它们具有可变的二氧化硅和石灰含量。25个样品的地球化学分析结果表明，比塞大矿床的石灰岩在LOI（33–39 wt％），SiO ₂（7–6 wt％），CaO（4–49 wt％）Al _2中显示出很大的变化范围O ₃（2-4 wt％）和Fe ₂ O ₃（0.74-1.45 wt％）。MgO，K ₂ O，Na ₂O和TiO ₂以痕量存在。CaO与LOI呈强正相关，而CaO和SiO ₂显示负相关。石灰石的化学成分确定了矿物学组成。本文的目的是显示来自比塞大矿床的高硅质石灰石组分对熟料参数（二氧化硅模量和石灰饱和系数）的影响，以突出其对水泥加工过程的影响。此外，建立预测地球化学模型，以整合和优化在水泥生产中估计为81,78,000吨的这种原材料。通过XRF对从采石场采集的不同含量的石灰石样品进行的地球化学分析表明，它们在石灰含量为46 wt％的碳酸盐中含量丰富，在含量为12 wt％的二氧化硅中含量较高。矿物学分析表明，在XRD衍射图中方解石和石英占优势。随后将获得的结果用于建立石灰和二氧化硅的地球化学图，从而根据地球化学采石场的组成确定操作计划的方向。地球化学和矿物学分析表明，在原始粉末组合物中整合了额外的硅质石灰石，可以根据突尼斯和欧洲标准要求，通过保持所生产水泥的质量，来填补石灰石开采中二氧化硅的缺陷。 。然后，本研究解释了石灰石的地球化学评估对水泥生产的重要性。地球化学和矿物学分析表明，在原始粉末组合物中整合了额外的硅质石灰石，可以根据突尼斯和欧洲标准要求，通过保持所生产水泥的质量，来填补石灰石开采中二氧化硅的缺陷。 。然后，本研究解释了石灰石的地球化学评估对水泥生产的重要性。地球化学和矿物学分析表明，在原始粉末组合物中整合了额外的硅质石灰石，可以根据突尼斯和欧洲标准要求，通过保持所生产水泥的质量，来填补石灰石开采中二氧化硅的缺陷。 。然后，本研究解释了石灰石的地球化学评估对水泥生产的重要性。