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Limestone

2018-12-12PV:3864

Reading guidance:

Limestone is mainly composed of calcium carbonate (CaCO3).Lime and limestone are widely used in building materials and industrial raw materials.Limestone can be directly processed into stone and fired into quicklime.Quicklime CaO moisture absorption or add water to become hydrated lime, hydrated lime is the main component of Ca(OH)2, can be called calcium hydroxide, hydrated lime by mixing into lime slurry, lime paste, used as coating materials and masonry adhesives.

Limestone thermal expansion: there is data shows, the limestone under 800 ℃, within the scope of the micro crystal limestone of the average thermal expansion coefficient is (4.5 ~ 5.0 * 10 ^ (6) / ℃, while the coarse crystal increases to 10.1 * 10 ^ (6) / ℃.The heating experiment of limestone is very important in lime production.In the limestone decomposition under 800 ℃ limestone expansion of crystallization in the body, forming crack in the highly crystalline limestone, and the crystal bigger by heat into powder by rupture, is very good for crystal growth, contains a lot of dense calcite limestone powder is serious.


Chemical properties

The main component of limestone calcium carbonate, the most important chemical properties is at a high temperature decomposed into calcium oxide and carbon dioxide, in addition to the following chemical properties.

1) chemical resistance

Except for acids, many aggressive substances cannot or can only slowly erode limestone.


2) acid resistance

Limestone reacts with all strong acids to form calcium salts and give off carbon dioxide at a rate that depends on the impurities in the limestone and the size of their crystals.The higher the impurity content, the larger the crystal, the lower the reaction speed.Dolomite reacts more slowly than limestone.The judgement method of dolomite, limestone: with 10% hydrochloric acid *** is on dolomite have a few bubble generation, *** is on limestone violent ground produces odorless bubble, the gas that produces can make clear limestone water becomes turbidity.