NRDC Technology offer - Precipitated Silica (Highly Dispersed)

PLANT PARAMETERS
Capacity	5MT/day or 1500 MT/A
No.of Shifts per day	3
Working days per Year.	300
Land Area, m²	10000 sq.mt.
Covered Area, m²	2450 sq.mt.
MANPOWER
Managerial	18
Skilled	18
Unskilled	20
RAW MATERIAL/DAY
Sodium Silicate-Glass	6.25 MT
Sulfuric Acid – Oleum	2.50 MT
Sodium Sulfate
UTILITIES/DAY
Power	400 KWH
Water Distilled	30 KL
Steam	2 Tons
Fuel (Kerosene)	350 Lits
PLANT & MACHINERY
Fluidised Bed Coal fired boiler		1
Digestor for sodium silicate glass		2
Silicate storage tanks		6
SS 316 Reactor		1
Instrumentation & flow controls		--
Plate & frame type filter press		2
Flash drier having water evaporation		1
Granulator		1
Pumps with motors		8
Air compressors		2
Weighing scale		1

USE USES: The Product is used by passenger car tyre manufacturer.

SPECIFICATIONS :

S. No.	Properties	Unit	Specified Limit
1.	Appearance	-	White free flowing powder /granules
2.	Moisture Content (105^oC, 2 hrs)	%	6.0 maximum
3.	Loss on Ignition (100^o C, 2 hrs) (Anhydrous basis)	%	5.0 maximum
4.	Bulk Density (tapped 50)	gm/lit	Powder = 220-260 Granules= 320-380
5.	pH Value (5% aq. Slurry)	--	6-7
6.	DBP Absorption Value	%	260 minimum
7.	SiO₂ Content (Anhydrous basis)	%	98.5 minimum
8.	Soluble Salts (Sulfates + Chlorides)	%	1.0 maximum
9.	Iron Content, (as FE⁺³⁾	ppm	2000 maximum
10.	Surface Area	M²/gm	200-240

PROCESS

Sodium silicate glass is digested in a digestor at high temp. and pressure and solution of desired concentration of sodium silicate is obtained. Using this solution and dilute-sulfuric acid, reaction is carried out in a reactor in presence of optimised quantity of electrolyte at elevated temp and in the optimised pH range of reaction medium.

After completion of reaction in stipulated time, product slurry is filtered and washed with water in the plate & frame filter press to remove soluble salts generated during the reaction. The wet cake from filter press is then dried in flash drying system.

The flash dried powder product is either directly packed in 25 kgs. HDPE bag or granulated in a powder compactor machine to get the granular form and then packed in suitable packing bags – as per the requirement of tyre manufacturing unit.

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