Great Wall Mineral
Great Wall Mineral (GWM) is internationally active in the market of industrial minerals with a sound reputation within a number of product applications. Having its own processing factories located in LingShou, a mountainous county renowned for mining and processing a series of nonmetallic minerals (among which muscovite mica, phlogopite mica, vermiculite, quartz, mineral fibre, plugging agent, drilling mud/fluid are extraordinarily prominent), Great Wall Mineral produces & exports customized merchandise for clients from all over the world. With a strong commitment to new technology, research and development GWM always goes beyond clients' expectations.
People and Know-How
GWM's people make the difference. As a knowledge-based company, Great Wall Mineral strongly believes that skills development and human capital are fundamental to the company's long-term success. Expertise in materials and processes comes from GWM's experienced people working in this field for many years and from the company's extensive R&D operations.
Business Concept
GWM develops, produces and markets selected minerals customised for a variety of industries worldwide. Integration of world-class assets forms a foundation for long-term stability, making GWM a strong and reliable partner.
From Mine to End User
Since GWM was founded in 1998, the company has developed into a highly professional processing&exporting company with multifaceted expertise of industrial minerals. GWM customises quality minerals for use in the development of industrial applications. The philosophy is to build growth on a foundation of high quality, world-class assets, direct contacts with customers and in-depth application knowledge.
Highly efficient logistics are central to the company's culture, and GWM maintains tight control of materials, from source to end user, to ensure quality and consistency.
General Description:
Vermiculite {(Mg, Fe, Al)3(Al, Si)4O10(OH)2 - 4H2O, Hydrated Magnesium Iron Aluminum Silicate Hydroxide} is an important member of the Montmorillonite/Smectite Group, members of which also belong to the larger general group known as the Clays. Vermiculite is also sometimes placed in the Mica Group, although recent analysis has excluded it from this group. Vermiculite is basically overly hydrated biotite or phlogopite. Natural specimens originated as these minerals and later altered to vermiculite through weathering or hydrothermal processes. Vermiculite typically forms small platy mica like crystals. These crystals contain water in their structures and when heated to above 870C, the water turns into steam causing the crystals to expand rapidly. The volume increase can be 500% to even 3000%.
Appearance: Flakes, splittings, particles, powder [Golden Vermiculite and Silver Vermiculite in different size].
Origin: China
Applications
Vermiculite is very useful for many industrial purposes. It is very lightweight, chemically non-reactive, fire resistant and odorless. Vermiculite can be used to soak up such toxic liquids as fertilizers, herbicides and insecticides. It is this ability that is also being put to good use as a bedding for pets and livestock. In addition, vermiculite can be used in concrete and ceramics as a heat resistant additive.
Important Properties
Vermiculite is usually brown to golden brown, also white, colorless or yellow. Luster is pearly to greasy. Its Crystals are translucent and Crystal System is monoclinic; 2/m. Its Crystal Habits include pseudohexagonal tabular crystals or "books", also found in compact or lamellar masses or microscopic crystals. The Cleavage is perfect in one direction, basal. Fracture is uneven to lamellar. The Hardness is 1.5 (can sometimes leave marks on paper). The Specific Gravity is 2.3 (below average). Its crystals expand to many times their original volume when heated. Best Field Indicators are softness, color, luster and expandability when heated.
Grades
Size Densities Equivalent names/designations
mm inch kg/cubic meter System A System B
16 5/8 down 600-1100 NA Premium (6)
8 5/16 down 600-1100 1 Large (4)
4 5/32 down 600-1100 2 Medium (3)
2 0.08 down 600-1100 3 Fine (2)
1 0.04 down 600-1100 4 Superfine (1)
0.5 0.02 down 600-1100 5 Micron (0)
In addition to the standard range of vermiculite product above GREAT WALL MINERAL can manufacture vermiculite grades tailored to customers specific requirements.
For more detailed information please contact the vermiculite factory GREAT WALL MINERAL.