This product is made of fine eremic mud added achoring agent and binder. After griding, screening, shaping and sintering, we make it. It is a kind of globable pellet, of which the size is uniform, the suface is solid. This product has much merit, such as large sunface area, high void fraction, less impurities high speed of filtering, long working period, little water consumption during washing back,and there is nothing halmful to the body of man. It will decrease the volume of the disfectant and cloud point, the effect of separating N.H3Pis over 99%, and that of separating CoDcr is over 40%. This product can improve the effect of filter material instead of quartz sand and anthracite.

Chemical composition

Chemical composition	SiO2	Al2O3	Fe2O3	CaO	MgO	K2O+Na2O	Else
Content%	60-65	18-21	7-9	3-4	1-4	3-5	Trace

Specification	Unit	Environmental protecting filter	Quartz sand
Bulk density	t/m3	0.51-1.1	1.4-1.6
Void volume	%	40-60	16-20
Abrasion ratio	%	≤2	≤3
Hydrochloric acid dissolving ratio	%	≤2	≤2.5
NaOH dissolving ratio	%	≤2	≤2.5
Specific area	cm2/g	2.5-7.8×104	0.15-2.0×103
Ununiformation coefficient	Φmm/粒度	1.0-1.3%	20-30%
Osmosis coefficient	cm/s	2.31-3.63	0.19-2.21
Peak of flow loss of cleaning filter	cm/M	10.1-2.21	34