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新疆云母超细磨矿及磨矿机理研究
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摘要
云母是一种重要的矿物资源,国内有着丰富、质量好的云母资源。云母具有优良的电绝缘性、耐热性、耐水性、耐化学腐蚀性、弹性和高剥离性,具有其它资源不可替代的优势。随着大片云母资源的日益减少和云母资源的综合利用的开展,云母的产品结构发生了重大变化。云母粉的应用和开发得到了很大的发展,应用范围越来越广泛。云母作为功能材料或填料都需要高纯度、细的粒度和窄的粒度分布、高白度和高径厚比。目前云母资源的开发利用现状是国内生产厂家对云母资源的深加工力度不够,生产的产品属于初级或中级加工产品,不能满足随着科学技术的发展对云母产品所提出的质量要求。
     本文对新疆可可托海的云母资源进行了充分、系统的研究。此云母资源属于尾矿产品,含铁很高,达到3.99%左右。进行了湿法磨矿试验,窄级别分级、增白等试验研究,探讨了为获得纯度高,白度高,高径厚比窄级别云母粉的工艺条件和工艺流程。
     试验研究结果表明:此种云母资源通过磨矿、分级可以获得云母含量大于90%左右的精矿;通过改变搅拌磨的磨矿方式、磨机转速,可获得不同质量的云母产品。搅拌磨具有生产能力大,工作效率高及产品无污染的特点,磨矿过程中,磨矿介质对云母的粉碎作用主要是冲击、剪切和研磨;采用轮碾机磨矿的方式,可以获得径厚比大(大于60),光泽很好的云母粉。磨矿产物经过分级,可以精确分级到10-35μm和10-60μm,分级效果明显。通过酸处理可以得到白度大于75%的云母微粉。推荐了云母湿法磨矿加工工艺流程,
     本文对云母湿法磨矿采用不同磨矿方式进行了实验研究,通过对矿浆流变特性、磨矿介质的作用方式及助磨剂对磨矿效率的影响机理进行了探讨。
     本文对云母湿法磨矿进行了较系统地研究,取得了良好的选矿指标,通过采用不同磨矿方式可以获得满足不同行业的需求,推荐了合理的工艺和设备。对我国云母资源的综合开发利用和地方经济的发展具有促进作用。
Muscovite is a kind of new natural inorganic material. In our country have abundant of resource. Muscovite has the excellent capability insulation. Those capabilities of muscovite cannot substitute by other mineral resource. At present, the domestic level of Muscovite processing is lower, the product mostly are primary or secondary products. With the development of material science those cannot satisfied with the quality requirement. As a functional material or filling are need higher content brightness narrowly particle size distribution and radius-thickness ratio.
    This paper had studied the muscovite resource of Xinjiang. This resource is ore dressing byproduct, the content of Muscovite about 85% and the content of Fe2O3 is high, about 3.99%. Study was made systematically and wet grinding, and classification, high gradient magnetic concentration, bleaching, obtained process condition and flowsheet.
    Studying showed by wet grinding and classification can obtain concentrate grade over 90%. Enriched ore with higher ratio to diameter to thickness is obtained by changing grinder type, medium and speed. Product brightness increases notably by grinding, acid treatment, brightness can reach 75%. Product granularity uniformity by classification, can obtain 10-35 m and 10-60 m classification product. By above experiments, process flow sheet was recommended. In the course of grinding, grinding medium action on muscovite are impacting, attrition and shearing. Using crushing roller mill can acquire product with higher radius-thickness ratio, over 60. and better luster. In this course muscovite is submitted to attrition and shearing and become size degradation.
    This paper studied systemically muscovite processing and surface modification, achieved good concentrate index, recommended reasonable process flow sheet, which will pay part in developing muscovite and economic development in local.
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