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硅灰石已广泛应用于陶瓷、涂料、塑料、橡胶和绝缘材料等方面,新的用途还在不断开发,其关键在于超细深加工,提高化学活性。本项研究试图通过不同粉碎方式(球磨、振动磨和气流磨等)、不同时间、有无添加剂(助磨剂和改性剂)的粉磨试验,选择提高其化学活性的最佳工艺。本文研究了湖北大冶硅灰石精矿粉经不同时间刚玉球干磨后,晶体结构的变化特点。我们认为硅灰石在球磨过程中晶体结构变化可分为四个阶段。初期以多型转变为主,后期以晶体结构破坏为主,晶格畸变效应贯穿变化的全过程。同时,我们提出了区分硅灰石多型的判据。另外,我们发现球磨过程中硅灰石晶粒的剥离方向并不总是平行于解理方向{100},而是变化的,但变化的剥离方向总是平行于晶体结构中单四面体的某些边棱方向。研究结果表明,随着球磨时间的延长,硅灰石粉体的化学活性不断增强。
Wollastonite has been widely used in ceramics, coatings, plastics, rubber and insulation materials, the new uses are still ongoing development, the key lies in ultra-fine deep processing, improve chemical activity. In this study, we tried to choose the best process to improve its chemical activity through grinding tests of different grinding methods (ball mill, vibrating mill and jet mill, etc.), different time and presence of additives (grinding aids and modifiers) In this paper, the characteristics of the crystal structure of the wollastonite concentrate from Hubei Daye after being dry-ground at different times were studied. We believe that wollastonite in the milling process crystal structure can be divided into four stages. Early multi-type transition-based, the latter part of the main crystal structure damage, lattice distortion effect throughout the entire process of change. In the meantime, we propose a criterion for distinguishing polytypes from wollastonite. In addition, we found that the wollastonite grains do not always peel in the direction parallel to the cleavage direction {100} during ball milling, but rather change in direction parallel to the single tetrahedron in the crystal structure Some edge direction. The results show that, with the ball milling time, the chemical activity of wollastonite powder is continuously enhanced.