Why are China s limestone mines mostly distributed in the east?

Because of the unique geographical location of the east, the distribution point of limestone mines is easterly.

Limestone is mainly formed in a shallow sea environment. Limestone can be divided into granular limestone (flowing water transport, sedimentary formation) according to its genesis; Bioskeleton limestone and chemical, biochemical limestone. According to the structural structure, it can be subdivided into bamboo-leaf limestone, chain-stuffy oolitic limestone, leopard skin limestone, clump limestone, etc.

The main chemical component of limestone is caCO3 easy to dissolve, so stone forests and karst caves are formed in limestone areas, called karst terrain Limestone is the main raw material for burning lime and cement, and is the flux for ironmaking and steelmaking. Limestone produced by biochemical processes is often rich in organic remains. Limestone generally contains some dolomite and clay minerals, and when the clay mineral cover content reaches 25% to 50%, it is called argillaceous limestone.

When the dolomite content reaches 25% to 50%, it is called dolomitic limestone. Limestone is widely distributed, the lithology is uniform, easy to mine and process, and it is a very versatile building stone.

The characteristics of limestone geology, fertile soil, suitable for planting rice (including rice, land rice), corn, winter buckwheat, peanuts, rape, sugarcane, tea and other crops

Limestone areas are areas where the bedrock is made of limestone and are also known as karst areas or karst areas. It is widely distributed in Guizhou, Guangxi and Yunnan in China. In Guangdong, limestone is mainly distributed in northern Guangdong, because the limestone area develops shallow soil layer, weak water storage capacity, so the environment is relatively dry, most of the plants growing on it have the characteristics of drought tolerance, and calcium loving plants are the characteristics, forming the unique characteristics of high calcium content in limestone vegetation.

Limestone vegetation has historically been of great interest to botanists.

Limestone is referred to as limestone, carbonate rock with calcite as the main component. Sometimes it contains dolomite, clay minerals and detrital minerals, gray, gray-white, gray-black, yellow, light red, brown-red and other colors, the hardness is generally not large, and there is a violent chemical reaction with dilute hydrochloric acid. So how is limestone formed?

The main component of limestone is calcium carbonate, which can be dissolved in water containing carbon dioxide. In general, one liter of water containing carbon dioxide dissolves about 50 mg of calcium carbonate.

The calcium carbonate deposited in the lake and the sea, after losing its moisture, is compacted and cemented to form a rock, which is called limestone. The mineral composition of limestone is mainly calcite (accounting for more than 50%), and there are some impurities such as clay and silt. The vast majority of limestone formations are associated with biological processesThe limestone formed by the accumulation of biological remains includes coral limestone, shell limestone, algae limestone, etc, collectively known as bio-limestone.

Limestone formed by chemical precipitation of calcium carbonate (CaCO3) in an aqueous solution, known as chemical limestone. Such as ordinary limestone, siliceous limestone, etc.

1 The mineral composition of limestone is mainly calcite, accompanied by dolomite, magnesite and other carbonate minerals, mixed with some other impurities. Among them, magnesium appears as leulastite and magnesite, silica is free quartz, chalcedony and opal are distributed in the rock, and alumina is synthesized with silica to synthesize aluminum silicate (clay, feldspar, mica); Iron compounds are carbonate (magnesite), pyrite (pyrite), free oxides (magnetite, hematite) and hydroxides (aqueous goethite); In addition, there is glauconite, and some types of limestone also have organic matter such as coal and pitch and sulfates such as gypsum and anhydrite, as well as compounds of phosphorus and calcium, alkali metal compounds and compounds such as strontium, barium, manganese, titanium, fluorine, etc., but the content is very low.

2. The nature of limestone.

Limestone has good processability, polishing and good cementation properties, insoluble in water, soluble in saturated sulfuric acid, can react with various strong acids and form corresponding calcium salts, and at the same time release CO2. When limestone is calcined to more than 900 (generally 1000 1300), it is decomposed into lime (CAO) and CO2 is released. Quicklime is deliquescent when exposed to water, and hydrated lime [Ca(OH)2] is immediately formed, and hydrated lime can be adjusted after being dissolved in water, and it is easy to harden in the air.

Shandong limestone mines are widely distributed in the Luxi area, but the outcrops are limited to the mountainous areas in the Yishu deep fault zone and the Luxi uplift area to the west. Its exposure range is roughly from Jinan-Zibo-Changle in the north, Zaozhuang-Linyi in the south, and Feicheng-Liangshan in the west. There are only sporadic outcrops in the Jiaxiang area. The limestone in the Luxi area is mainly produced in the Cambrian-Ordovician, and its outcropping area is about 1700 km2

In addition, in Qixia, Penglai, Longkou and other places in the north-central part of the Jiaobei uplift, there are also limestone mines in the Penglai Group of the Neoproterozoic Sinian that are sporadically exposed.

The limestone of Changle County is mainly distributed in Gushan, Niushan, Mashan and Luohuan Mountains in Baodu and Zhuliu streets, as well as in the areas of Huoshan in Wutu Street, Xingshanzi and Dashan in Yanyu Town, Panlong Mountain and Huangshan in Yingqiu Town.

In Yunnan-Guizhou, Gui and other regions, some well-known scenic spots have limestone landform scenery.

Limestone produced by biochemical stool reeds is often rich in organic remains. Limestone generally contains some dolomite and clay minerals, and when the clay mineral content reaches 25% to 50%, it is called argillaceous rock. When the dolomite content reaches 25% to 50%, it is called dolomitic limestone.

Limestone is quite extensive, the lithology is uniform, easy to mine and process, and it is a very versatile building material.

Limestone mines, generally used for mining cement, are very useful.