With the increasingly prominent environmental problems in the world and the requirements for sustainable development strategies, people are paying more and more attention to the disposal and utilization of various types of waste. At present, the usual method for the disposal of wastes is to use incinerators for incineration or landfill. Landfill methods will occupy large areas of land and cause secondary pollution. In contrast, the use of cement rotary kiln is more advantageous than the professional incinerator in the thoroughness of economy, prevention of secondary pollution and harmless treatment.
Developed countries in the world have been using cement rotary kiln for industrial applications for the disposal and use of combustible industrial waste for nearly 30 years. They are technically mature and have formed a complete system. China's cement production has used power plant fly ash, blast furnace slag, iron sulfide slag, copper slag, flue gas desulphurization gypsum, calcium carbide slag, red mud and other industrial wastes in raw materials for many years. According to preliminary statistics, about 20% of the raw materials required for cement production in the country come from the aforementioned industrial waste. However, compared with foreign countries, China still has a large gap in terms of policy support, technical level, and scale.
According to statistics, there are currently more than 100 cement companies in the world using flammable waste as alternative fuels. Among them, the world's largest cement producer, France's Lafarge Company, used flammable waste as its fuel replacement rate in 2001 by 50% to 55%, reduced fuel costs by 33%, and reduced carbon dioxide emissions by 5 million tons. The US Environmental Protection Agency stipulates that only one cement plant will be reserved in each industrial city, and it will be used to dispose of hazardous waste generated in the city while partially meeting cement demand. At present, only Beijing Cement Factory and Shanghai Wanan Cement Co., Ltd. have succeeded in processing hazardous wastes and achieved mass production. However, in the use of cement kiln to treat domestic waste, no cement plant has been scaled up.
One of the features of circular economy is the reduction, recycling, and harmlessness of waste, while the cement industry can realize the reuse of some wastes with its production process and product characteristics. However, relevant experts also reminded that cement kiln processing waste must be based on the premise that it does not affect cement production and quality. Wastes containing high levels of alkali metal and chloride ions and compounds containing sulfur, phosphorus, cyanide, and mercury should not be burned in cement rotary kiln. In addition, in order to adapt to the use of combustible waste, cement plants need to be adapted accordingly. Such as the increase of the corresponding storage, transportation and metering devices; the transformation of the burner; detection, measurement equipment must be complete. At the same time, it is suggested that relevant government departments should strengthen the enforcement of laws and regulations on environmental protection and various types of waste disposal so as to keep these wastes in a controlled state; set up specialized agencies to collect, process and transport all types of waste to related Enterprises; establish and improve relevant laws, regulations, product quality standards, taxation policies, etc.; develop waste recycling technology and accelerate research on related technologies and equipment.
It is understood that Jilin Yatai Cement Co., Ltd.'s rotary kiln incineration waste project has been included in the northeast old industrial base adjustment and transformation of treasury bonds, some of the investment will be subsidized by the central budget, the National Development and Reform Commission requires the project unit to build a demonstration line as soon as possible.
Tungsten carbide mixed Metal Alloy Powder is commonly used in PTA (Plasma Transferred Arc) welding. PTA welding is a process that involves the deposition of a hardfacing material onto a base metal to provide wear resistance, corrosion resistance, and improved mechanical properties.
Tungsten carbide is a very hard and wear-resistant material, making it ideal for applications where high abrasion resistance is required. It is often mixed with other metals, such as nickel, cobalt, or chromium, to form a metal alloy powder. These metal alloys enhance the properties of the tungsten carbide and improve its compatibility with the base metal.
The tungsten carbide mix metal alloy powder is typically fed into the PTA welding torch, where it is melted and propelled onto the surface of the base metal using a high-energy plasma arc. The molten powder forms a hard, dense coating that bonds with the base metal, providing excellent wear resistance and protection.
The specific composition of the tungsten carbide mix metal alloy powder can vary depending on the application requirements. Different ratios of tungsten carbide and other metals can be used to achieve desired properties, such as hardness, toughness, and corrosion resistance.
Overall, tungsten carbide mix metal alloy powder is a versatile and effective material for PTA welding, offering superior wear resistance and protection for various industrial applications.
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