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Chemical property and characteristics of polymer
Published in S. Thirumalai Kumaran, Tae Jo Ko, S. Suresh Kumar, Temel Varol, Materials for Lightweight Constructions, 2023
A. Sofi, Joshua Jeffrey, Abhimanyu Singh Rathor
Mica is a platelet-shaped reinforcing filler used in polymers to increase heat deflection temperature and reduce warpage. Types of micas include: muscovite (white to gray), lepidolite (lithium-mica, white to gray), phlogopite (brownish depending on the iron content), biotite (dark brown to black), and other micas. Their use in polyamide is mostly in the automobile sector for under-the-hood applications.
Resources and Sustainable Materials
Published in Stanley E. Manahan, Environmental Chemistry, 2022
Micas are complex aluminum silicate minerals that are transparent, tough, flexible, and elastic. Muscovite, K2O•3Al2O3•6SiO2•2H2O, is a common type of mica. Better grades of mica are cut into sheets and used in electronic apparatus, capacitors, generators, transformers, and motors. Finely divided mica is widely used in roofing, paint, welding rods, and many other applications. Sheet mica is imported into the United States, and finely divided “scrap” mica is recycled domestically. Shortages of this mineral are unlikely.
Petroleum Geological Survey
Published in Muhammad Abdul Quddus, Petroleum Science and Technology, 2021
Mica is the most common silicate and has a shiny texture. The mica group silicates are layered and sheet-forming materials. All have a monoclinic crystal structure. The mica breaks along the cleavage plane, forming very thin elastic slices. The basic unit is the SiO4– tetrahedral ion. Each tetrahedral ion is linked by three corners to the neighboring tetrahedral forming a sheet structure. The crystal structure of mica is monoclinic. The most common mica silicates are biotite and muscovite. Mica has various colors from white to brown to black. Muscovite produces colorless transparent slices. ‘Biotite’ refers to the dark mica series. The mica group silicates possess a high density range between 2.8 and 3.1 g/cm3. Mica is used as a thermal and electrical insulator.
Fluoride and Metals in the Agricultural Soils of Mica Mining Areas of Jharkhand, India: Assessing the Ecological and Human Health Risk
Published in Soil and Sediment Contamination: An International Journal, 2023
Substantial variations in the concentration of metals and fluoride were observed amongst the locations (Figure 2). High concentration of Al, Fe, Mn and F were estimated in the locations of Koderma, Domchanch, Tisri, Deori and Jainagar (Locations 10, 12, 18, 19 and 24, respectively). These locations are under the influence of mica mining activities. Highest concentration of Pb, Zn, Cr and Ba were observed in the location of Chouparan (location 3) which has high vehicular load. Cluster analysis (CA) was applied to group the locations and the result of CA in the form of dendogram is depicted as Figure 3. The dendogram illustrated three clusters (i) locations 16, 17, 11, 15, 1, 4, 3, 20, 21, 2, 23, 5, 7, 6 and 22; (ii) locations 12, 19, 10, 18 and 24; (iii) locations 8, 9, 25, 13 and 14. Of the three clusters, cluster (ii) can be associated with mica mining activities. The locations of the 3rd cluster are free from any anthropogenic activities and mostly located in remote forest areas. The locations of the 1st cluster are under mixed type of anthropogenic influences which include vehicular load, urbanization and small-scale industries. The results thus advocate that the elemental concentrations of soil are invariably dependent on its land use and other anthropogenic activities, more relevantly mining activities in case of present study area.
Physico-chemical characteristics of some Lesotho’s clays and their assessment for suitability in ceramics production
Published in Particulate Science and Technology, 2018
Monaheng Masheane, Lebea Nthunya, Mukuna Mubiayi, Thimothy Thamae, Sabelo Mhlanga
Natural clay minerals include kaolinite, quartz, mica, hematite, chlorite and illite (Kirkpatrick 1983; White 1987; Murray 1999; Anthony et al. 2011; Pohl 2011; Aramide 2012). Quartz (the principal constituent of silica sand), quartzite and ganister occur as an impurity in most clays, whereas kaolinite is a typical clay mineral found in most brick-making raw materials. It exhibits good sintering behavior, has a high melting point and forms no glass phase when firing to the relatively low brick manufacturing temperatures (900°C) (White 1987; Pohl 2011). Mica is an important rock-forming mineral in igneous, metamorphic and sedimentary rocks and it cleaves into transparent sheets. It is readily transformed into clay by weathering. Owing to their high potassium content (KAl2(AlSi3O10)(OH)2), these minerals are good fluxes. They are conducive to liquid phases at low temperatures (950°C). Their sintering interval is short (Kirkpatrick 1983). Furthermore, hematite compounds also act as fluxes in a clay body during the firing process (Anthony et al. 2011). Clay bodies undergo several changes during drying and firing stages as a result of physical, chemical and mineralogical modifications. Kaolinite–illite is the most widely used clay mixture in the ceramic industry. Illite is one of the main clay phases used for the preparation of mixtures for traditional ceramics.
Evaluation of two nano-silane-modified emulsion stabilised pavements using accelerated pavement testing
Published in International Journal of Pavement Engineering, 2022
F.C. Rust, M.A. Smit, I. Akhalwaya, G.J. Jordaan, L. du Plessis
The above analysis indicated that both the roads investigated should perform better than their respective design lives. In addition, significant cost savings were achieved and there is also an environmental impact in significantly less use of quarried crushed aggregate. This technology has specific application and benefit where high mica concentrations are present in the available in-situ road building materials that would make cement stabilisation less effective. The technology can, inter alia, be very beneficial for the upgrading of urban neighbourhood roads at significant cost savings and construction time savings. The inherent benefit of the NME dispelling water ingress could also minimize maintenance on these roads.