Rotary kiln burner is divided into direct heating burner and indirect heating burner, indirect heating burner design, production, installation project note the following points:
1. No naked flame can be seen when heating raw materials. In case of naked fire, explosion will occur
2. The heating process requires automatic control, no matter ignition, flameout, fuel addition, etc., as well as leakage protection measures and temperature control functions.
Second, pay attention to: low nitrogen environmental protection, in today's environment, low nitrogen emission reduction is the most important.
The nozzle of rotary kiln is very special and has special technological standards and requirements, so the production must meet its technological requirements. Especially, the nozzle of rotary kiln goes deep into the length of the kiln and can be freely adjusted to adjust the combustion high temperature area to ensure the requirements of output and temperature.
Moreover, the particularity of fuel requires high calorific value and stable combustion.
Zinc dioxide is an oxide of zinc that is insoluble in water but soluble in acids and strong bases.It is white solid, also known as zinc white.It can be obtained by burning zinc or roasting sphalerite (zinc sulfide).In nature, zinc oxide is the main component of red zinc ore.Although there are two ways to make artificial zinc oxide: by oxidizing pure zinc or by baking zinc ore.Zinc oxide is used as an additive in a variety of materials and products, including plastics, ceramics, glass, cement, lubricants, paints, ointments, adhesives, caulking materials, pigments, foods (zinc supplements), batteries, ferrite materials, flame retardant materials and medical emergency bandages.Zno is a wideband gap semiconductor material with band gap of about 3.3ev at room temperature and exciton binding energy of up to 60meV, which is expected to replace GaN as the material for uv LD and LED.It has important applications in optoelectronics.In high acid index adhesives, it thickens extremely in the container.
In order to improve the physical properties and related chemical compositions of raw materials such as direct zinc oxide and indirect zinc oxide extracted by zinc steam on ceramic glaze, heavy calcined zinc oxide was obtained by calcining the nozzle of rotary kiln.
Calcined zinc oxide ratio is significant, good fluidity, with its production of glaze shrinkage is small, the glaze is not easy to appear pinhole and crack.In addition to major, calcined zinc oxide product quality standards and grade zinc oxide the same.After calcining at high temperature, the zinc oxide appears pale yellow and its melting point is 1975.
Calcined zinc oxide is an important ceramic chemical flux raw material, especially in the building ceramic wall and floor tile glaze and low temperature glaze and ceramic pigment amount more, also widely used in the art ceramic glaze.Functions and USES in glaze: ZNO has a strong melting aid function in glaze, which can reduce the expansion coefficient of glaze, improve the thermal stability of the product, and at the same time increase the gloss and whiteness of glaze, and improve the elasticity of glaze.In the expansion of the melting range at the same time can increase the luster of the glaze, but contains chromium in the black glaze with caution.Generally speaking, ZNO is mainly used in the following aspects:
1. As flux: when ZNO is used as flux in low-temperature frit glaze, the general dosage is between 5% and 10%, and in low-temperature raw glaze, the general dosage is about 5%.
2. As a turbidity agent: in the presence of Al?O?Adding zinc oxide to the higher glaze can improve the opacification of the glaze.Because ZNO can be compared to Al?O?Form zinc spinel crystals.In a zinc-containing opaque glaze, Al?O?It can improve the whiteness and turbidity of glaze.SiO2 enhances the glaze.
3, as a crystallization agent: in the art glaze crystal glaze, ZNO is an indispensable crystallization agent, in the melting glaze rapid cooling, the formation of a larger crystal pattern, very beautiful.The amount of ZNO in crystalline glaze is up to 20 ~ 30%.
4. For making cobalt sky blue glaze: ZNO is a very important flux in cobalt sky blue glaze. It can make cobalt oxide form a beautiful sky blue in the glaze.
5. Used as ceramic pigment: ZNO can be used as ceramic pigment flux, mineralizing agent and glaze color carrier due to its strong fusibility.In the brown ceramic color series as the main raw materials
6. Used as glass additive: zinc oxide with aluminum, gallium and nitrogen is 90% transparent and can be used as glass coating to allow visible light to pass through while reflecting infrared.The coating can be applied to the inside or outside of the window glass for insulation or heat insulation.
Of course, last but not least, safety first!Be sure to keep in mind.
——Author：ebico