助磨剂对粉石英超细磨矿的影响

研究了三乙醇胺对粉石英超细磨矿的影响及助磨作用机理，采用粒度分析，Ｘ－射线衍射分析、红外光谱分析等测试手段，定性描述了助磨的作用效果。并解释了助磨剂有效控制粉石英粉碎平衡，降低极限，延缓“团聚”形成的原因。     

助磨介质作用下旋窑熟料微细化过程的研究

研究了助磨剂作用下旋窑熟料的微细化过程，结果表明，助磨剂在不同粉磨阶段的作用机理不同，在相同的粉磨时间下助磨剂提高了粉磨细度，改善了物料的颗粒分布，改变了颗粒形貌，还改变了粉磨物料的微观结构，加剧了物料的晶格畸变，晶格缺陷及无定形比，加速了物料结构中化学键的破坏，尤其是C3S矿物中Si-O键的断裂，从而增加物料的反应活性。     

热力粉碎石英的粉磨特性

为了提高石英矿的粉磨效率,采用天然石英矿为原料,系统地研究热力粉碎石英矿的粉磨特性。结果表明,热力粉碎能够改变石英矿的物理结构,大幅度降低矿块的硬度,显著提高石英的粉磨效率;影响石英热力粉碎效果的主要因素有煅烧温度、煅烧时间和煅烧粒度,煅烧温度大于600℃后可以实现石英的有效粉碎,以800~900℃为宜,煅烧粒度越小,其粉磨效率越高,煅烧时间与矿块的尺寸有关,其长短由石英矿块内外温度达到平衡的时间来确定;热力粉碎石英与未经热力粉碎的石英相比,不仅大大提高了磨矿效率,而且磨矿产品的粒度分布更窄、更细、更均匀。     

粉石英在行星球磨过程中的晶体结构的变化

论述了用行星球磨机对粉石英进行超细粉碎时所发生的晶体结构和物理化学方面的变化。采用粒度分析、扫描电镜、Ｘ－射线衍射、差热分析等测试手段,揭示了粉石英在球磨过程中晶体结构变化的特征,剖析了粉石英在球磨过程中呈现出的阶段性以及同步性的特点。并通过碱溶和水溶试验,验证了表面无定形层的形成     

助磨介质作用下旋窑熟料微细化过程的研究

研究了助磨剂作用下旋窑熟料的微细化过程。结果表明 ,助磨剂在不同粉磨阶段的作用机理不同 ,在相同的粉磨时间下助磨剂提高了粉磨细度 ,改善了物料的颗粒分布 ,改变了颗粒形貌 ,还改变了粉磨物料的微观结构 ,加剧了物料的晶格畸变、晶格缺陷及无定形化 ,加速了物料结构中化学键的破坏 ,尤其是C3S矿物中Si—O键的断裂 ,从而增加物料的反应活性     

水泥助磨剂在水泥粉磨中的重要作用

水泥助磨剂可以很好地改善粉磨条件、提高粉磨效率、大大降低粉磨能耗,同时还具有优化水泥颗粒级配、增加水泥的抗压抗折强度、减少温室气体的排放、提高水泥中混合材的掺量等优点.系统阐述了助磨剂在水泥粉磨中的重要作用,包括助磨剂的作用机理、分类、所带来的经济效益、发展历程以及存在的问题等.     

粉石英尾砂超细粉碎研究

采用搅拌球磨机对粉石英尾砂进行超细粉碎实验。在最佳实验条件下 ,可使 99.9%的粉石英尾砂粒径在 2 0 μm以下     

助磨剂对泡沫玻璃配合料粉磨效率的影响

采用干法粉磨工艺,选取丙三醇、硅酸钠、三异丙醇胺、三乙醇胺、木质素磺酸钠5种助磨剂,研究助磨剂对泡沫玻璃配合料粉磨的影响;改变助磨剂掺量,以粉体粒度评价助磨剂对配合料粉磨效率影响。结果表明:随着助磨剂掺量的增大,粉磨效率提高,但是粉磨效率存在一个极值,该极值与助磨剂的种类和用量相关;泡沫玻璃配合料的最佳助磨剂为三乙醇胺,最佳掺量(质量分数)为0.04%,粉磨后平均粒径为13μm,比未用助磨剂的配合料平均粒径减小43%。     

单体助磨剂对硅酸盐水泥性能的影响

以三异丙醇胺、三乙醇胺、丙二醇、乙二醇、山梨醇和二乙二醇6种不同的醇及醇胺类单体为助磨剂,添加的质量分数均为0.04%,粉磨30 min,分析粉磨后的水泥颗粒形貌、比表面积、筛余量、粒径分布以及3、28 d水泥试块的强度等。结果表明,6种助磨剂均能改善粉磨效率,提高胶砂强度。     

高钛矿渣的粉磨特性研究

由于攀钢高炉渣中含有20%以上的TiO2,使其利用受到很大限制,为使高钛矿渣作为掺合材料应用于混凝土,需首先了解高钛矿渣的粉磨特性。本文中研究了粉磨时间与高钛矿渣细度之间的关系,对比了高钛矿渣与普通矿渣易磨性并分析了助磨剂对高钛矿渣粉磨的影响。结果表明,高钛矿渣的易磨性较普通矿渣差,可使用助磨剂提高高钛矿渣的粉磨效率。     

Impact of grinding aids on dry grinding performance,bulk properties and surface energy

In dry fine grinding processes the relevance of particle-particle interactions rises with increasing product fineness. These particle-particle interactions reduce the grinding efficiency and complicate the process control. The adsorption of grinding aid molecules on the product particle surface is a common measure to handle these effects. To ensure an efficient grinding aid application, the impacts of additives on particle and bulk properties, which influence the micro-processes inside the mill, need to be understood. Within this study the effects of several grinding aids on dry fine grinding of limestone in a laboratory vibration mill were investigated. Unlike in many other scientific works, the impacts of grinding aids were analyzed on different levels simultaneously: Grinding success and agglomerate size distributions were evaluated by wet and dry particle size measurements, respectively. Additionally, material coating on the grinding media, powder flowabilities and particle specific surface energies were measured. It was shown that all of the investigated grinding aids influence the grinding efficiency. However, the formation of agglomerates is not necessarily linked to the product fineness. Furthermore, a strong impact of certain grinding aids on the flowability of the product powder was determined. Thereby, the bulk flow behavior also determines the grinding result as it affects the stress mechanism inside the mill. Moreover, a direct relation between surface energy and powder flowability as well as agglomeration behavior could be demonstrated.     

Analysis of grinding aid performance effects on dry fine milling of calcite

The control mechanism in the production of fine particles is important in dry grinding processes, which are popular in the grinding of some minerals. The behavior of the fine particles with each other and with the mill environment is complex and needs to be investigated in detail (on a micro-scale) in every application. One of the parameters controlling the fine particles in a mill is the use of the correct amount and type of grinding aid. Mechanisms of action must be understood well to develop grinding aids and fully utilize their positive effects. As a general explanation, with the use of grinding aids, the production tonnage can be increased at the desired product fineness, as well as achieving a finer product at the same production tonnage. However, it is necessary to know other mechanisms and effects to increase efficiency and correct use. The influence of grinding aids on the dry fine grinding of calcite using several analysis methods was revealed in the present study. Within the context, the results were assessed considering grinding performance (particle size distribution and size reduction ratio), product quality (color properties), flowability, adsorption properties (FTIR), and agglomeration behavior (SEM). Moreover, the tested effect of each grinding aid was discussed for each analysis, and the collected results were combined around a summary core diagram.     

助磨剂在Al(OH)_3微粉生产中的应用研究

通过实验研究了助磨剂在Al(OH)3 微粉生产中的应用效果 ,优选用于Al(OH)3 微粉种的助磨剂种类的添加量 ,对生产过程中的料球质量比、浆料质量浓度等工艺参数进行优化 ,结果表明 :添加0.4 %Z -1型助磨剂 ,可使现有设备的产能提高1倍以上。     

矿物湿法超细磨矿中助磨剂的作用效应及其程度的研究

通过考察硬脂酸钠对重质碳酸钙－水矿浆粘度的影响和因硬脂酸钠在重钙表面吸附而导致的颗粒表面自由能的变化以及由此产生的对湿式搅拌磨细磨重质碳酸钙磨矿效果的影响,研究了助磨剂的各种作用效应及其程度。结果表明,助磨剂对矿物湿法细磨的助磨作用是改善矿浆流变性和吸附降低颗粒表面自由能两种效应综合的结果,其中前一作用较强。     

Practical strategy to produce ultrafine ceramic glaze: Introducing a polycarboxylate grinding aid to the grinding process

In this work, a polycarboxylate comb-like polymer was used as grinding aid for ceramic slurry, and the effect of addition of this grinding aid on ceramic process property was highlighted. The grinding efficiency of the polycarboxylate grinding aid (PG) in terms of the particle size distribution and specific surface of unit volume of the ceramic slurry being ground were investigated. Consequently, the PG that was synthesized via free radical polymerization under the condition of an APEG/AA/MA molar ratio of 0.3:1:1, an initiator dosage of 5 wt%, and a reaction time of 6 h at 90 °C, provided better grinding efficiency than those of the triethanolamine and other commercial grinding aids. Specifically, with a dosage of 0.21% and 2 h of grinding, the d₉₇ and d₅₀ of ceramic slurry decreased from 13.956 μm and 2.043 µm to 3.739 µm and 0.561 µm, respectively. The cumulative distribution, frequency distribution and SEM results exhibited a uniform particle size distribution for ceramic ground with PG-C. Furthermore, the sintering experiment indicated that a lower processing temperature was capable of producing ultrafine ceramic. These improvements indicated the potential application of the PG as an efficiency ceramic grinding aid, which further facilitating the preparation of uniform ultrafine slurry by a sand mill.     

Mechano-Chemical Interactions in the Use of Polyacrylic Acid as a Grinding Aid in Fine Grinding in Stirred Media Mills

ABSTRACT

Mechano-chemical interactions have been studied by using polyacrylic acid as a grinding aid for fine grinding in stirred media mills. The polymer additive was found to enhance grinding efficiency by up to 100%. Optimum operating conditions and mechanisms involved with the additive effects are discussed. It was also found that polymer conformation and polymer molecular weight change during stirred milling. Extension of the polymeric species and fragmentation of the high molecular weight polymer molecules resulting from grinding treatment may be beneficial.     

加气混凝土用铝粉的应用与制备

用干式球磨法生产加气混凝土用铝粉。根据加气混凝土的生产工艺,确定其对铝粉的性能要求。在加气混凝土用铝粉的生产工艺中,通过调整原料铝粉的粒度、助磨剂加入量和磨内滞留时间的工艺参数来控制铝粉的性能。通过实践及数据分析,确定最佳工艺参数:原料铝粉粒度d97=630￣280μm;助磨剂加入量在3.0%;铝粉磨内滞留时间为16.6￣19h。     

钢渣超微粉/橡胶复合材料的性能及补强-阻燃机制

以磁选热闷渣、未磁选热闷渣、电炉渣和风淬渣作为研究对象,以乙二醇、三乙醇胺和无水乙醇制备钢渣助磨剂,钢渣助磨剂与钢渣进行复合获得钢渣超微粉。将钢渣超微粉与炭黑N220、促进剂、硫磺、 ZnO、硬脂酸、天然橡胶进行复合,制备钢渣超微粉/橡胶复合材料。研究钢渣种类和钢渣助磨剂用量对钢渣超微粉/橡胶复合材料力学性能和阻燃性能的影响。利用XRF、 XRD、 LPSA和FTIR对化学成分、矿物组成、粒度分布和组成结构进行测试。结果表明,以电炉渣制备的钢渣超微粉/橡胶复合材料的力学性能最佳,以磁选热闷渣或未磁选热闷渣制备的钢渣超微粉/橡胶复合材料的阻燃性能最佳。钢渣助磨剂可以减小钢渣超微粉的粒度尺寸,改善钢渣超微粉的粒度分布均匀程度。随着钢渣助磨剂用量的增加,钢渣超微粉的粒度分布均匀程度改善,钢渣超微粉/橡胶复合材料的力学性能提高,阻燃性能降低。     

EFFECTS OF GRINDING AIDS VIBRATION MILLING OF ALUMINUM

Fine aluminum powder is widely used in making paints, printing inks, slurry explosives, pyrotechnic chemicals etc. Hence the production of aluminum powder is highly important. In this paper the effect of grinding aids on the grinding characteristics of aluminum in a vibration mill under an inert atmosphere of nitrogen has been investigated. It is found that the use of grinding aids is essential in grinding of atomized aluminum. Among four different grinding aids, stearic acid appears to be the best grinding aid.     

硅晶圆磨削减薄工艺的磨削力模型

硅晶圆磨削减薄是一种有别于传统磨削的材料加工方式。磨削减薄过程中,硅晶圆和砂轮同时绕旋转轴旋转,砂轮沿垂直方向连续进给去除材料,其中磨削力是磨削质量的决定性因素。目前,尚缺少一个用于硅晶圆磨削减薄工艺的磨削力预测模型。为了得到磨削力模型,分析了磨削减薄过程中的硅晶圆材料去除机理,将磨削力分为摩擦力和切屑力,考虑了磨粒运动轨迹,分别计算了单颗磨粒在法向和切向上的摩擦力和切屑力,最后基于有效磨粒总数建立了总磨削力模型。模型综合考虑了磨削参数、砂轮和硅晶圆的几何参数和材料性质对磨削力的影响。讨论了砂轮进给速度、晶圆转速和砂轮转速三个主要磨削参数对磨削力的影响,讨论了硅晶圆上晶向对磨削力的影响,给出了磨削力在硅晶圆面上沿径向的分布情况。