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煅烧棕刚玉 Calcined Grains of BFA For abrasives

　　煅烧棕刚玉通过高温1100℃二次煅烧：
　　　 ①可将硅铁合金从刚玉颗粒分裂出来，以利加磁选效果。
　　　 ②可提高磨料的强度和亲水性、增加韧性。
　　　 ③煅烧使棕刚玉中的低价钛氧化成高价钛有利于消除磨具烧成时的"反常膨胀"避免"网状裂纹"。
　　实践证明煅烧棕刚玉磨料是加工高档磨具的最佳配料。

棕刚玉磨料煅烧前后韧性值比较

磨料粒度	未煅烧	1000℃煅烧	1350℃煅烧
24#	46	63	73
30#	56	67	74
36#	71	83	88
46#	67	79	88
60#	54	66	68
80#	78	83	85

It is one kind of Brown Aluminium Oxide grains with blocky grain shape and high bulk density. To get this kind of product, we calcine the regular grains at a high temperature to give a blue colour, the purpose is to renovate the crack on the surface and interior of crystal and then to improve the toughness and durability of the grains.
As an abrasive, It is mainly used in making vitrified and organic bonded grinding wheels for working in heat sensitive metals and alloys.

Typical Chemical Analysis

Al2O3	Fe2O3	TiO2	SiO2	CaO
95.70%	0.12%	2.66%	0.98%	0.22%

Physical Properties

Color	Dark brown
Shape	Blocky, tough and sharp
Crystal Form	Alpha-alumina trigonal system
True Specific Gravity	3.96 g/cm3
Hardness	2090 Knoop scale; 9.0 Mohs scale
Melting Temperature	About 2050 ℃
Magnetic Material	0.0076%
Toughness	63.17
Hydrophilic	75.00

Bulk Density Test Value (g/cm3)

Grit No	F12	F14	F16	F20	F22	F24	F30	F36	F40	F46
B.D	1.98	1.97	1.96	1.91	1.91	1.91	1.90	1.85	1.80	1.80
Grit No	F54	F60	F70	F80	F90	F100	F120	F150	F180	F220
B.D	1.75	1.75	1.75	1.74	1.73	1.73	1.73	1.70	1.69	1.64

Grit Size Available (F)

8	12	14	16	20	22	24	30	36	40	46	54	60	70	80	90	100
120	150	180	220	240	280	320	360	400	500	600	800	1000	1200	1500	2000

Particle Size Distribution (PSD)

PSD According to ISO, ANSI, FEPA and JIS.

Packing Way Selection

a. In 25kg plastic woven bags.

b. In 1000kg big bag.

c. 40 x 25kg plastic woven bags in one big bag.

d. 40 x 25kg plastic woven bags on pallet.

e. 40 x 25kg paper bags on pallet.

f. According to client’s special requirement.