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These materials are still used in large quantities as building and engineering materials (including limestone products, cement, concrete, and mortar), as chemical feedstocks, and for sugar refining, among other uses. Lime is used extensively for wastewater treatment with ferrous sulphate.

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Lime is a calcium-containing inorganic mineral composed primarily of oxides, and hydroxide, usually calcium oxide and/ or calcium hydroxide.Limestone is extracted from quarries or mines. Part of the extracted stone, selected according to its chemical composition and optical granulometry, is calcinated at about 1,000 °C (1,830 °F) in different types of lime kilns to produce quicklime according to the reaction:

Quick Lime Chemical Parameters :

1	% of Available CaO	82 -85	80±2 (For AAC Blocks)
2	% Total CaO	88% min.	85% min.
3	% Acid Insoluble as SiO2	1.5 (Max.)	2.0 (Max.)
4	% MgO	2.0 (Max.)	2.5 (Max.)
5	% R2O3	0. 5 (Max.)	0.5 (Max.)
6	Mesh (BSS)	97-98% passing through 250 mesh	90-95% passing through 170 mesh
7	Reactivity Time 55°C	15-20 minutes	20- 30 minutes
8	Packing	Once used Jumbo Bag/ PP/HDPE bag

Hydrated Lime Chemical Parameters :

Grades	A	B	C	D	E	F
% of Available Lime as Ca(OH)2	+90	+85	+80	+75	+70	+65
% of Available Lime as CaO	+68	+64	+60	+56	+52	+49
% Acid Insolubles (Max.)	1.0	1.5	3.0	4.0	4.5	6.0
% Iron as Fe	<0.035	<0.040	<0.050	<0.055	<0.060	<0.060
% Magnesia as MgO	1.25	1.5	2	2	2.5	2.5
Mesh (BSS)	250	200	200	150	150	150
Packing	PP/HDPE Bag & Jumbo Bag

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