silica fume ,factory .black

      silica fume ,factory .black Decriptions of micro silica fume Silica fume is the fume through special treatment. However the fume is the waste gas that is discharged in the process of high-temperature smelting silicon metal. So it is the by-product of silicon metal.The appearance of microsilica is white or black and its refractoriness is greater than 1600C. Usages of micro silica fume (1)Silica fume can be blended into cement and concrete to improve the quality of concrete.         (2)It can be used as addition agent in the fireproofing material. Silicon fume has high fluidity, high strength.   (3)It is the adhesive of metallurgical pellet.   Specifications  

Analysis Object%	Brand
	97#	94#	90#	88#	85#
SiO2	97.0	94.0	90.0	88.0	85.0
Al2O3	1.0	1.0	2.0
Fe2O3	1.0	1.0	2.0
CaO+MgO	1.0	1.0	2.0
K2O+Na2O	1.0	1.5	2.0
C	1.0	2.0	2.0	2.5	3.0
NaOH	1.0	3.0	3.0	4.0	4.5
PH	4.5-6.5	4.5-7.5	4.5-7.5	4.5-8.5	4.5-8.5
Sizeabove45um	3.0	3.0	5.0	8.0	8.0
Moisture	15
M2/g	1.0	2.0	2.5	3.0	3.0

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