Hollow microsphere from coal fly ash

Refractory cenosphere 1.Size:-300micron 98%min 2.Floating Rate:95%min 3.Bulk Density:0.33-0.45g/cc(typically 0.38g/cc)

Hollow microsphere from coal fly ash

Hollow microsphere is one kind of coal ash hollow ball which can floating on the water. Pale color, thin-walled hollow, very light weight. The volume weight range from 250 to 450 kg/m3, Particle size is about 0.1 mm. its Surface closed and smooth, Thermal conductivity small, refractory degree equial or greager than 1700°C, is excellent insulation refractory materials, widely used in light pouring material production and oil drilling and many other aspects.

The major chemical compositions of Hollow microsphere are silica and the aluminum oxide based, It has the functions of fine particles, hollow, light weight, high strength, wear-resistant, thermal insulation, fire-retardant insulation and many other features.

The chemical composition of the drift beads

composition	SiO2	Al2O3	Fe2O3	SO3	CaO	MgO	K2	Na2O
Content (%)	56-62	33-38	2-4	0.1-0.2	0.2-0.4	0.8-1.2	0.5-1.1	0.3-0.9

 

physical performance of hollow microsphere

item	Test Metric
shape	high flow spherical power	grain diameter (um)	10-400
color	shallow gray	specific resistance (Ω.CM)	1010-1013
actual density	0.5-0.8	Moh’s hardness	6-7
bulk density (g/cm3)	0.3-0.5	PH value	6
refractoriness °C	1750	melting point (°C)	≥1400
thermal diffusivity (m2/h)	0.000903-0.0015	thermal conductivity (w/m·k)	0.054-0.095
compression strength (Mpa)	≥350	refractive index	1.54
Burning loss rate	1.33	oil absorption rate (g(oil)/g)	0.68-0.69

 photos:

Hollow microsphere from coal fly ash