What is the raw material of glass?
How is glass produced? Glass production process includes batching, melting, forming, annealing and other processes. The following are described below:1. ingredients, according to the design of the material sheet, weighing all kinds of raw materials, mixing in a mixing machine evenly. The main raw materials of glass are: quartz sand, limestone, feldspar, soda ash, boric acid and so on.2., melting, the raw materials will be prepared by high temperature heating, forming a homogeneous bubble free liquid glass. This is a complex process of physics and chemistry. The melting of glass is carried out in a furnace. There are two main types of Furnaces: one is a crucible kiln, the other is glass in the crucible, and the other is heated outside the crucible. The small crucible kiln has only one crucible, and the larger one can be more than 20 crucibles. The crucible kiln is made by gap type, and now only optical glass and color glass are produced by crucible kiln. The other is the tank furnace. The frit is molten in the bath, and the flame is heated on the upper part of the glass. The glass melting temperature mostly in the 1300~1600 C Eve joy. Most of them are heated by flame and a few are heated by electric current. They are called electric furnaces. Now, the pool kiln is continuous production, small pool kiln can be a few meters, big can be more than 400 meters, 2.
It can be made into various shapes by moulds. The irregular structure of glass determines the following characteristics of glass:1. isotropic particles of glass are arranged irregularly in general, but are statistically uniform, so that their physical and chemical properties are the same in any direction. The crystal is anisotropic. Examples: resistivity, thermal conductivity, transmissivity, refractive index, etc..2. there is no fixed melting point. Glass changes from solid to liquid and varies gradually over a range of temperatures. The crystal is determined by melting point, for example, (water ice crystals) in C melt 0 Eve joy. This property of glass makes it possible to be shaped by blowing, pulling, pressing, and other methods.3. tunability of composition and properties. The properties of the glass may vary continuously and gradually within a certain range with their properties. The crystal has a fixed component and a definite performance. In this way, we can adjust the composition of the glass, so that its performance meets the requirements of the use.
We know that solid materials can be divided into two categories: organic materials and inorganic materials. Organic materials are wood, plastic, plexiglass, cotton, wool, nylon and so on. Inorganic materials can be divided into three categories: single crystal, polycrystal and glass according to the structure. A single crystal has regular shapes and strict rules, such as the ruby is an alumina single crystal, the crystal is a silica single crystal, and the diamond is a single crystal of carbon. Polycrystal is a collection of large amounts of small single crystals, and all kinds of ceramics and metals are polycrystalline materials. Glass is a noncrystalline solid obtained by melting, cooling, and curing. Its structure has certain rules (short-range order) in the atomic and molecular range, but there is no rule (long-range disorder) in the macroscopic range.
