The vast majority of inorganic matter can be classified into oxides, acids, alkalis and salts. Organisms in the inorganic matter mainly water and some inorganic ions, such as Na +, K +, Ca2 +, Mg2 +, Cl-, SO42-, and so on. The human body contains almost all kinds of elements in nature, in which carbon, hydrogen, oxygen and nitrogen are mainly in the form of organic compounds, the rest are collectively referred to as inorganic (mineral or ash) .Therefore, inorganic matter is mainly composed of: Water and inorganic salts, which can be classified as water: combined with water and free water, combined with water is an important component of cell structure, free water is a good solvent, transport substances, involved in chemical reactions. Inorganic salts can be divided into: ions and compounds, ions are to maintain normal cell life activities, the compound is an important component of intracellular compounds.
Composed of two elements, one of which is the oxygen element of the compound. The substance that reacts with oxygen is called an oxide. According to the different chemical properties, oxides can be divided into two kinds of acidic oxides and alkaline oxides. Acidic oxide: An oxide that acts as a salt with water or as a base. Such as sulfur trioxide, phosphorus pentoxide, carbon dioxide and the like, and most of the non-metallic oxides are acidic oxides.
Alkaline oxide: can react with acid to produce salt and water oxides, and the product can only have salt and water, can not have any other substances. Alkaline oxides include low-valent oxides of active metal oxides and other metals such as CaO, BaO and CrO, MnO.
A class of compounds that can ionize H in aqueous solutions. Hydrochloric acid, sulfuric acid, nitric acid ionization in aqueous solution, the resulting anion (acid), although different, but the resulting cation (H) is the same, so they have a common place in nature, for example, with sour; Many metal; can make blue litmus paper red and so on. In the narrow sense, the cationic ions in the aqueous solution are all hydrogen ion compounds (such as sulfuric acid). Most of these substances are soluble in water, a small part, such as: silicic acid, insoluble in water. Acid aqueous solution is generally conductive, part of the acid in the form of molecules in the water, non-conductive; part of the acid dissociation in the water as positive and negative ions, can be conductive.
Traits: white or with gray lumps or granules. Sensitive to moisture. Easy to absorb carbon dioxide and moisture from the air. Soluble in water into calcium hydroxide and produce a lot of heat, soluble in acids, glycerol and sucrose solution, almost insoluble in ethanol. The relative density of 3.32 ~ 3.35. Melting point 2572 ° C. Boiling point 2850 ℃. Refractive index of 1.838. Corrosive.
Uses: 1. Can be used as fillers, such as: used as epoxy adhesive filler; 2. Used as analytical reagents, gas analysis as a carbon dioxide absorbent, spectral analysis reagents, high purity reagents for semiconductor production Of the extension, the proliferation process, the laboratory ammonia drying and alcohol off l water and so on. 3. Used as raw materials, can produce calcium carbide, soda ash, bleaching powder, also used for leather, waste water purification, calcium hydroxide and a variety of calcium compounds; 4. Can be used as building materials, metallurgical flux, cement quick- 6, can also be used for refractory materials, desiccant; 7. Can be formulated agricultural machinery and glue and underwater epoxy (2) can be used as a vegetable oil decolorizer, drug carrier, soil conditioner and calcium fertilizer; Adhesive, and also used as a pre-reaction with the 2402 resin reactants; 8. for acidic wastewater treatment and sludge conditioning; 9. Can also be used as a boiler to disable the protective agent, the use of lime moisture absorption capacity, so that boiler water vapor 10, can be reacted with water to prepare calcium hydroxide, the reaction equation: CaO + H2O = Ca (OH), the reaction of the surface of the system can be dry, to prevent corrosion, suitable for low pressure, medium pressure, small capacity drum boiler long-term protection; 2, belonging to the reaction.