Cement rotary kiln belongs to the category of building material equipment and is a kind of lime kiln. It belongs to the category of building material equipment and is a kind of lime kiln. Rotary kiln can be divided into cement rotary kiln, metallurgical chemical rotary kiln and lime rotary kiln according to different materials. Cement rotary kiln is the main equipment of cement clinker dry and wet production line.
Cement rotary kiln
Cement rotary kiln belongs to the category of building materials equipment.
Cement rotary kiln operates under heavy load and alternately runs at high speed under high temperature. The level of equipment maintenance and thermal system control related to the safety and efficiency of rotary kiln operation. The maintenance focus of the transmission device is the lubrication of the equipment, the operating status, dynamic detection and the meshing accuracy of the large and small gears; the installation accuracy of the support device determines whether the rotary kiln can run safely and reliably. During operation, attention should be paid to the reasonable control of the load capacity distribution of the various supporting wheels , The arrangement of the supporting wheels, the pressure and time of the hydraulic block wheels, the force of the supporting wheels, the gap between the belt and the pad. The quality of the sealing device directly affects the thermal system of the rotary kiln and
Specifications
Technical Parameters
the Lord
cement
According to different heating methods, it is divided into two categories: internal heating and external heating.
The material of the internally heated rotary kiln is in direct contact with the flame and flue gas, and the furnace can be adjusted by
1.Dispose of hazardous waste
First we need to know, what is hazardous waste? According to the Law of the People's Republic of China on the Prevention and Control of Environmental Pollution by Solid Waste: Wastes that have one or more hazardous properties, such as corrosive, toxic, flammable, reactive or infectious, and also have hazardous properties that may have an impact on the environment Or wastes that cause harmful effects on human health are all classified as hazardous wastes. For example: medical wastes, pesticide wastes, heat-treated cyanide-containing wastes, waste emulsions, fuel coating wastes, explosive wastes, and wastes containing hazardous chemical components, such as the zinc-containing batteries we often mention, as well as in industrial production, science, A large amount of hazardous waste generated during the experiment. Knowing this, do you think that hazardous wastes are always with us? The wide source and huge amount of them have made us shocked step by step, and the damage to human bodies and the damage to the ecological environment by hazardous wastes have been obtained. Countries around the world attach importance to it, and some people call it hazardous waste as ' political waste' .
It is the most important thing to improve the treatment and reuse of hazardous waste to create a green, low-carbon, environmentally friendly and energy-saving life.
After people's continuous exploration and experiments for a long time, many methods for treating hazardous wastes are summarized, such as landfilling, incineration, chemical or physical methods for neutralization, extraction, magnetic separation, hydrolysis, precipitation, etc., among which the cement rotary kiln is used. Because of its unique advantages, the technology for hazardous waste treatment has become the most effective method for hazardous waste treatment and reuse, and has been vigorously promoted and used.
The temperature of cement rotary kiln is high, the state is stable, and the waste is burned more thoroughly. The cement rotary kiln is under negative pressure during operation. It avoids the leakage of harmful gases when handling hazardous waste, and because of the tightness of the rotary kiln, Will cause dust pollution and is conducive to environmental protection. Chemical components such as chlorine, sulfur, and fluorine contained in hazardous waste are completely absorbed during high-temperature treatment, and converted into non-toxic calcium chloride, calcium sulfate, calcium fluoride, etc., which are directly mixed in cement clinker. Generally does not cause adverse effects on cement quality. The waste produces a certain amount of heat during combustion, which saves coal-fired raw materials and saves production costs.
The advantages of cement rotary kiln in the treatment of hazardous waste are: environmental protection, energy saving, safety, and certain economic benefits.
2. Smelting
In addition to calcining cement clinker, cement rotary kiln is also used for calcining clay, limestone and slag drying. In the production of refractory materials, rotary kiln calcining raw materials are used to make its size stable, increase its strength, and reprocess. In non-ferrous and ferrous metallurgy, iron, aluminum, copper, zinc, tin, nickel, tungsten, chromium and other metals are smelted and roasted with rotary kiln as the smelting equipment. For example: it is used in the production of aluminum to roast aluminum hydroxide into alumina; it is used in ironmaking to produce pellets for blast furnace ironmaking; foreign "SL / RN method" and "Krupp method" are used to iron ore Direct reduction; chlorinated volatile roasting method is used to extract tin and lead. During the beneficiation process, a rotary kiln is used to magnetize and roast the lean iron ore, so that the original weak magnetism of the ore is changed to strong magnetism to facilitate magnetic separation. In the chemical industry, rotary kiln is used to produce soda, calcined phosphate fertilizer, barium sulfide, etc. This method has the advantages of low energy consumption, low electricity consumption, no need for sulfuric acid, and the use of low- and medium-grade phosphate ore, and it is quickly popularized.
In addition, in terms of environmental protection, the use of cement kilns to burn hazardous waste and garbage not only reduces waste and makes it harmless, but also uses waste as fuel, saves coal powder, and realizes resource recycling.
