Introduction to Calcium Carbonate
Calcium carbonate is an inorganic compound, its chemical formula is CaCO3, it is the main component of limestone و marble. Calcium carbonate is usually white crystal, odorless and basically insoluble in water. It is easy to react with acid to release carbon dioxide.
The role of calcium carbonate in environmental protection industry
Application in water treatment
①Adjust water hardness
Calcium carbonate is one of the common hardness components of water. The hardness substances in water are mainly calcium ions and magnesium ions. When the content of calcium ions and magnesium ions is high, the water will become hard. Calcium carbonate can combine with calcium ions and magnesium ions in water to form relatively stable cluster compounds, and the cluster compounds can reduce the impact of hard water and soften the water, thus not only the water quality is improved, the adverse effect of scale on pipes and equipment is prevented.
②Adjust PH value
The pH value of water refers to the concentration of hydrogen ions in water, it directly affects the properties and functions of water. Calcium carbonate can neutralize acidic substances and reduce the corrosive effect of acidity on water. It can also remove odor, color and harmful impurities in water.
③Remove metal ions, such as fluorine, chromium and iron
Excessive fluoride content in drinking water can cause harm to human body, and chromium and iron in water can cause the water to turn yellow and have an unpleasant odor. While calcium carbonate can absorb fluoride, chromium and iron ions in water, then reduces bad impact on human health and water environment.
④Reduce scale and prevent pipe blockage
Water contains a large amount of calcium and magnesium ions, these ions will aggregate in the water to form insoluble compounds, then scale is formed. Calcium carbonate can combine these ions with CO2 to form soluble carbonate, then reduces scale in pipes and equipment, and ensure the normal operation of equipment and facilities.
⑤Improve utilization of irrigation water
The utilization of agricultural irrigation water can be improved by adding calcium carbonate. Calcium carbonate can reduce salt content in soil, promote the reproduction of fungi and bacteria and increase soil fertility, thereby improving utilization of irrigation water and increasing crop yields.
Application in wastewater treatment
Ⅰ Adsorb organic matter
Calcium carbonate can absorb a large amount of organic matter in wastewater, such as phenol and styrene, thereby achieving the purpose of purifying the water environment.
Ⅱ Adsorb heavy metal ions
The heavy metal ions contained in wastewater have adverse effects on water environment and human health, while calcium carbonate can adsorb heavy metal ions, such as: cadmium ions and aluminum ions, reducing the content of heavy metal ions.
Ⅲ Precipitate organic matter in wastewater
Calcium carbonate can combine with organic matter in wastewater to form cluster precipitation, thereby removing organic matter. At the same time, by controlling the condition and speed of precipitation, the concentration of organic matter can be effectively controlled.
Ⅳ Precipitate heavy metal ions
Calcium carbonate can combine with heavy metal ions in wastewater to form precipitation, thereby removing heavy metal ions. This method is one of the most widely used methods for wastewater treatment at present. It has advantages of simple process and low cost.
Flue gas desulfurization
In industrial field, such as: thermal power plant and steel plant, a lot of flue gas is generated. Flue gas contains a large amount of sulfur dioxide, it is the main cause of acid rain. As a desulfurizer, calcium carbonate can react with sulfur dioxide to generate calcium sulfate, thereby achieving flue gas desulfurization and reducing sulfur dioxide emission.
Soil remediation
Calcium carbonate can neutralize acidic substances in the soil, increase the pH value of the soil, and promote plant growth. Calcium carbonate can also react with heavy metal ions in the soil, to form insoluble carbonate precipitation, to reduce the pollution of heavy metals to the soil.
Solid waste treatment
Calcium carbonate can be used as cover material for landfills to reduce environmental pollution. In the process of resource utilization of certain solid waste, calcium carbonate can be used as additive or stabilizer to improve the physical and chemical properties of the waste and increase its utilization value.
Application in building material
In the field of building materials, calcium carbonate is one of the indispensable raw materials. It can be used as a filler and reinforcing agent in building materials, such as: wall panel, floor tile and ceiling. These renewable materials has good effects of sound insulation and heat insulation, more important, using these renewable material can reduce construction waste, thereby protecting the environment.
ملخص
Calcium carbonate is one kind of mineral with environmental advantages. It has been widely used in various fields. With the enhancement of environmental awareness and the advancement of technology, the application prospect of calcium carbonate will be broader.
When applied in environmental protection industry, the particle size and purity of calcium carbonate need to meet certain requirements. For example, in water treatment, the particle size of calcium carbonate can affect its reaction speed and effect with water; In metal ion removal, the particle size can affect the speed and effect of precipitation. This requires grinding and classifying of calcium carbonate. The ball mill and air classifier produced by Qingdao Epic Powder Machinery Co., Ltd. are suitable for grinding and classifying of calcium carbonate used in environmental protection industry. These two equipment can form a ball mill classifier system, which is an internationally cutting-edge non-mineral powder processing production line, and it has high reputation among domestic and foreign customers.
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