China limestone carving-What are the uses of limestone?

Limestone is widely distributed in nature, a rock, the main component of limestone is calcium carbonate, mainly used in high-temperature ceramic glaze flux. China's ancient kiln created by thousands of different varieties of high-temperature glaze are inseparable from the limestone.

Lime and limestone are used extensively for building materials, industrial raw materials. Limestone directly processed into stone and fired into lime. Lime absorb moisture or add water to become slaked lime, the main component is Ca (OH) 2, can be called calcium hydroxide, hydrated lime by the deployment of lime slurry, lime paste, used as a coating material and brick adhesive. Here we learn about the understanding of limestone knowledge of it

China limestone carving-How the limestone is formed

The limestone is mainly formed in the shallow sea environment. Limestone can be divided into granulated limestone (water transport, sediment formation); bioskeleton limestone and chemical, biochemical limestone. According to the structure can be subdivided into bamboo leaves limestone, limestone, clumps limestone and so on. The main chemical composition of limestone is easy to dissolve calcium carbonate, so in the limestone area to form stone and cave, known as the karst terrain.

Limestone generally contains some dolomite and clay minerals, when the clay mineral content of 25% to 50%, known as the mudstone. Dolomite content of 25% to 50%, known as the dolomitic limestone. Limestone distribution is quite extensive, lithology uniform, easy to mining processing, is a very versatile building materials.

The main component of limestone is calcium carbonate, can be dissolved in water containing carbon dioxide. Under normal circumstances a liter of carbon dioxide containing water, can dissolve about 50 mg of calcium carbonate.

According to geologists in the Guilin area survey, found that the water there can be dissolved every year, erosion of limestone surface about a thin layer of nails. Do not look only to dissolve so little this year, but the history of earth development is extremely long. To the nearest geological period - the Quaternary, there are about 300 million years. Even if such a slow dissolution rate, 300 million years can also dissolve 900 meters! And Guilin's solitary peak is only one hundred and twenty meters high, the maximum height of the cave is only a few tens of meters. But there is not a place where limestone can form such a topography, but the need for large area, large thickness, geology and purity of the limestone, but also requires a warm and humid climatic conditions are likely to develop into such a perfect landscape, Beautiful natural scenery.

China limestone carving-Limestone chemical properties

l) Chemical resistance

In addition to acid, many erosive substances can not erode or only slow down the limestone.

2) acid resistance traits

Limestone reacts with all strong acids to produce calcium salts and emit carbon dioxide. The rate of reaction depends on the impurities contained in the limestone and their crystal off size. The higher the impurity content, the larger the crystal, the smaller the reaction rate. The reaction rate of dolomite is slower than that of limestone. Dolomite, limestone Determination of the method: 10% hydrochloric acid drops in the dolomite with a small amount of bubbles, dripping on the limestone is the intense generation of odorless bubbles, the resulting gas can make clear lime water becomes turbid.

3) resistance to various gas traits

Chlorine and hydrogen chloride in the dry state and room temperature and CaCO3, the reaction is very slow, until 600 after the start to accelerate the formation of CaCl2; sulfur dioxide at room temperature, whether it is gaseous or liquid on CaCO3 have no significant effect; and nitrogen dioxide NO2) reacts with CaCO3 at 15 ° C to produce Ca (NO3) 2, NO and CO2.

The use of limestone

Limestone is a very valuable resource for limestone limestone as a mineral raw material. Limestone in the history of human civilization, with its wide distribution in nature, easy to obtain the characteristics and is widely used. As a major building material has a long history of mining, in modern industry, limestone is the manufacture of cement, lime, calcium carbide main raw material, metallurgical industry is an indispensable flux limestone, high-quality limestone by ultra-fine grinding, Used in the manufacture of paper, rubber, paint, paint, medicine, cosmetics, feed, sealing, bonding, polishing and other products. According to incomplete statistics, cement production consumption of limestone and building stone, lime production, metallurgical flux, superfine calcium carbonate consumption of limestone sum ratio of 1: 3. Limestone is a non-renewable resource, with the scientific and technological progress and the development of nanotechnology, limestone applications will be further widened.

China limestone carving-The chemical formula of limestone

Limestone: CaCO3 ------ marble, granite and so on

Slaked lime: Ca (OH) 2 -------- used for construction, also known as lime

Lime: CaO -------- desiccant and so on

Summary: The above is the small series for everyone to introduce the use of limestone and limestone chemical type of content, and hope to be able to effectively help to everyone, more information please pay attention to www.chinamarble.com