What is hydrated (slaked) lime?

Hydrated lime or calcium hydroxide, with the chemical formula Ca(OH)2, is a white alkaline substance that is produced from calcium carbonate (limestone). Due to its strong alkaline properties and cheapness, this substance is the most widely used alkali and also one of the most widely used materials and has various uses in the industry. There are various names such as quicklime, hydrated lime, calcium hydroxide, dead lime, etc. for this compound.

Hydrated lime production method

The production of hydrated lime is done by baking stones with calcium carbonate composition, such as calcite, marble, and travertine in the furnace and bringing the temperature of the stone to 950–1100 degrees and then mixing it with water. First, calcium carbonate must be converted into calcium oxide or quicklime (CaO) due to calcination, then calcium oxide reacts with a set and specified amount of water in the hydrator device and turns into calcium hydroxide or hydrated lime.

The reaction of calcium oxide with water is very exothermic and as a result of this reaction, the baked stone becomes powdery and soft to a large extent. Of course, in order to obtain a quality product, it must be ground and produced in a uniform size. The reactions to produce hydrated lime from calcium carbonate are as follows:

CaCO3 + heat → CaO + CO2

CaO + H2O → Ca(OH)2

Lime kilns:

• Traditional furnaces: They are old and dome-shaped furnaces in which lumps of limestone are stacked and heat enters through the lower vent and turns into quicklime during cooking for 12 to 24 hours. Fuel consumption in these furnaces is very high, and their product is not uniform.
• Rotary furnaces: These furnaces have much better efficiency than traditional furnaces and are made of a horizontal tube that rotates around its axis with a slight slope. In these ovens, crushed and granulated materials are baked, and preheaters can be used to increase production efficiency.
• Standing furnaces (vertical): single shaft and twin shaft, limestone with a diameter of 10 to 20 cm is poured into it and firing is done in them, and they have good efficiency and very little fuel consumption.

Also, you can refer to the page of this device on the site for more information about rotary oven and standing oven.

Application of hydrated lime

• Cement industries
• Steel factory
• Drinking water and sewage treatment plant
• paper factory
• Production of paint and resin
• Glass industry
• Food production
• Petrochemicals, oil well drilling (drilling mud)
• Civil applications (road construction, dam construction, runway infrastructure, building foundations, etc.)
• Desulfurization
• Waste incinerator to reduce hydrocarbon emissions

Purity and packaging

Hamun Industrial Group sells hydrated lime with the following specifications:

Granulation: mesh 325-2500

Purity: 93-90

Packaging: 25 kg bag – jhanbo – bulk

Also, this group is ready to sell hydrated lime with the specifications and analysis requested by customers in case of receiving large orders.

The seller of hydrated or quick lime with 325-2500 mesh, 90% purity, in the form of bags, jhanbo, bulk is ready to supply and sell lime needed by factories and artisans.