Use of Sawing Waste from Zeolitic Tuffs in the Manufacture of Ceramics

Table 1

Synoptic table of performed thermal treatments.

	1a	1b	1c	1d	1e	1f	1g	1h	1i	1l	1m
Powder	Cab70/LacBen	Cab70/LacBen	Cab70/LacBen	Cab70	LacBen	Cab70	LacBen	Cab70	LacBen	Cab70	LacBen
Compact	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Dimensions of compacts, cm	–	𝑑=4.05, ℎ=1.00	𝑑=4.05, ℎ=1.00	𝑑=4.05, ℎ=1.00	𝑑=4.05, ℎ=1.00	𝑑=4.05, ℎ=3.00	𝑑=4.05, ℎ=3.00	𝑑=4.05, ℎ=1.00	𝑑=4.05, ℎ=1.00	𝑑=4.05, ℎ=1.00	𝑑=4.05, ℎ=1.00
Thermal pretreatment of powders	No	No	No	No	No	No	No	Yes^a	Yes^b	Mixed^c	Mixed^d
Heating rate, ^∘C/min	10	10	5	2	2	2	2	2	2	2	2
T,^∘C	500, 600, 700, 800, 900, 1000, 1100, 1200	500, 600, 700, 800, 900, 1000, 1200	1050	1050	1100	1050	1100	1050	1100	1050	1100
Heating time, hr	3	5	5	5	5	5	5	5	5	5	5
Cooling rate, ^∘C/min	E^e	E^e	F^f/E^e	G^g/E^e	H^h/E^e	G^g/Ee	H^h/E^e	G^g/E^e	H^h/E^e	G^g/E^e	H^h/E^e

a Yes: Thermal pretreatment at 600^∘C for 3 hours.
b Yes: Thermal pretreatment at 800^∘C for 3 hours.
c Mixed: 50% of untreated powder and 50% pre-heated at 600^∘C for 3 hours.
d Mixed: 50% of untreated powder and 50% pre-heated at 800^∘C for 3 hours.
e E Means that the furnace was switched off and the products were left in the furnace until they cooled down to room temperature (25^∘C).
f F From 1050^∘C to 800^∘C the cooling rate is 5^∘C/min.
g G From 1050^∘C to 700^∘C the cooling rate is 2^∘C/min.
h H From 1100^∘C to 700^∘C the cooling rate is 2^∘C/min.