Microwave Heating Dezincing Kiln

Microwave Heating Dezincing Kiln, Resource Utilization of Slag Solid Waste

Market Background and Necessity

There are large quantities of tailings and slag containing 50%-60% zinc and iron in Northwest China. If not treated, these tailings and slag not only occupy vast amounts of land and cause significant harm to the surrounding ecological environment but also require substantial processing and maintenance costs, representing a huge waste of steel resources. The construction and implementation of this project using microwave high-temperature heating technology can effectively supplement raw material sources for the steel industry, alleviate the pressure of industrial hazardous waste treatment for mining enterprises and mineral processing industries, and positively contribute to improving the living environment of the population.

This project breaks the traditional notion that "waste is useless and harmful," establishing a new scientific concept that "most waste can be utilized and turned into treasure." Transforming waste into valuable resources is the core of this project's technology, which will greatly contribute to the environmental cause of waste utilization and resource regeneration.

I. Technical Application of Microwave in Mining Kilns:

If microwave dezincing and carbon-catalyzed reduction roasting are applied to iron slag tailings, the slag is pelletized and pre-dried and solidified by microwave, then enters the microwave shaft kiln equipment for high-temperature heating to discharge zinc oxide vapor in a negative pressure environment. Simultaneously, carbon monoxide and carbon dioxide gases are produced, and the zinc vapor enters the recovery system for collection. After microwave treatment, the metallization rate exceeds 85%, and the dezincing rate is about 95%. This equipment is mainly used for dezincing iron slag and performing carbothermal reduction to produce iron oxide, turning waste into treasure and making it qualified raw material for steelmaking. Utilizing the selective heating characteristics and catalytic effects of microwaves, the iron slag is treated to remove zinc and other components as much as possible, and the iron in the slag is reduced, transforming it into raw material for the steel industry. This project's technology is not only clean and environmentally friendly but also highly scientific and economically beneficial, achieving resource reuse.

II. Technical Principles and Features of Microwave Industrial Equipment:

The slag dezincing equipment absorbs microwave thermal energy through the material itself. Because microwaves are extremely high-frequency electromagnetic waves, polar and non-polar molecules in the material become polarized and turn into dipole molecules when exposed to a microwave field. These dipoles align with the electric field direction. Since the electric field is alternating, the dipoles rotate and vibrate with the changes in the electric field. For example, at a frequency of 2450 MHz, they rotate and vibrate 2.45 billion times per second, producing an effect similar to friction between molecules, thereby absorbing the energy of the electric field and generating heat. The material itself becomes the heat source. Microwave heating is a non-contact internal heating method, so the material heats up as a whole. In contrast, traditional heating uses coal, electricity, oil, or gas kilns, which are energy-intensive or produce pollution and exhaust emissions. Their heating methods rely on radiation, convection, and other heat conduction processes from the outside in, resulting in high energy consumption, low efficiency, and long heating times.

Microwave heating technology features fast heating speed, selectivity, catalytic properties, non-direct contact between the heat source and the material, ease of automatic control, and energy savings. Microwaves offer energy efficiency (high conversion to thermal energy, saving over 30% compared to traditional heating methods), environmental friendliness (no external emissions, effectively reducing harmful substances), cleanliness (the material itself absorbs microwaves to generate heat, avoiding contact pollution and improving product quality and yield), and high thermal efficiency (rapid heating, high energy utilization). Additionally, ZhongSheng's microwave industrial equipment can operate at temperatures up to 1600°C, with kiln temperature stability of ±5°C. Combined with automated and intelligent operations, it significantly improves the production environment.

III. Quality of ZhongSheng Microwave Industrial Equipment:

Hunan ZhongSheng Thermal Energy Technology Co., Ltd. was established in 2011 with a registered capital of 12 million yuan. It is a company long engaged in the research, development, application, and equipment integration of microwave thermal energy technology in industry, specializing in design, manufacturing, and sales. The company primarily produces microwave multifunctional experimental furnaces suitable for enterprises and research institutions, as well as customized industrial microwave equipment. In the field of microwave applications, it holds 12 invention patents and 57 utility model patents. Among these, microwave heating kiln technology was selected for the Fifth Batch of Energy-Saving Technology Promotion Catalog by the National Development and Reform Commission. Compared to low-power household microwave ovens, ZhongSheng Thermal Energy's industrial microwave equipment is designed for continuous operation, stable production, and reliability in industrial settings. It is equipped with a 1.5KW industrial-grade microwave source with continuously adjustable power to ensure uniform, adjustable, and controllable furnace temperature. The equipment can operate 24 hours uninterrupted. Additionally, it uses a crack antenna energy feed device to ensure a uniform microwave field and prevent microwave reflection from damaging the magnetron, allowing the magnetron to operate 24 hours non-stop. Replaceable wear parts can be changed online without stopping production. The equipment also features microwave leakage protection devices, with microwave leakage not exceeding 1mW/cm² (the standard microwave leakage limit is 5mW/cm²), significantly improving production safety. Other manufacturers typically only meet industry requirements. ZhongSheng's microwave drying lines, microwave experimental furnaces, microwave high-temperature bell kilns, microwave high-temperature push plate kilns, microwave high-temperature roller kilns, and microwave pyrolysis kilns all have successful application cases.

IV. Services: Technical Exchange / Small Sample Testing / Visit / Equipment Ordering

We particularly welcome customers to visit our company for on-site inspections. In the field of microwave industrial equipment, we possess genuine intellectual property technology, several pilot-scale equipment units, non-standard manufacturing capabilities, and application examples of various furnace types. These cannot be fully explained in a single sentence or picture. In the field of high-temperature microwave applications, we hold our own invention patents. We have accumulated considerable process experience and industrial application examples. Friends are welcome to visit and exchange ideas; please call to schedule an appointment if needed.

Microwave Dezincing Kiln Consultation: Manager Xu of ZhongSheng, 156 7439 3491

Factory Address: Tonghai Road, Economic Development Zone, Yueyang City, Hunan Province