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Magnesite powder or flotation concentrate powder adopts the new technology equipment of flash gas suspension calciner to obtain high-grade light-calcined active magnesium oxide: the superior performance of this system equipment is fully reflected in the heat treatment of powder materials; firstly, the raw powder or wet powder is quickly dispersed and dehydrated to ≤1% by using the waste heat of calcination, and the original particle size is restored. The particles are fully thermally decomposed and reacted in the rotating upward airflow at 950-1000°C. The particles are heated at a high temperature and release CO2 and crystal water instantly to form porous magnesium oxide particles. The calcination process is completed in 3-5 seconds without over-burning or under-burning. The new calciner is equipped with energy-saving and emission-reducing technology to achieve clean production, and it can also be applied to the calcination of flotation tailings. The calcined tailings powder has greater activity and specific surface area, and is more effective when used in flue gas desulfurizers, high-strength construction cement, and fireproof materials.
From the perspective of mineral deep processing methods, the current better process is to use first grinding and then calcining or flotation to increase the main grade of magnesium and then calcining. The key is powder calcining equipment. It is very important to need an advanced calcining technology equipment that is more in line with technical conditions. First of all, environmental protection, energy saving and emission reduction and low operating costs are required. It is necessary to ensure thermal decomposition rate and activity of lightly calcined powder and recovery efficiency of powder. It is viscous and fine powder is easy to form agglomeration phenomenon; the traditional equipment commonly used in China at present includes light-fired vertical kiln, rotary kiln, fluidized fluidized kiln, suspension roasting furnace, multi-layer roasting furnace, and reflection kiln. Grinding and grading are prone to moisture absorption and secondary pollution in the follow-up process. The above-mentioned equipment has defects of varying degrees, and the product quality is unstable. It is necessary to solve the technical problems of mineral calcination in this industry as soon as possible, and update them to make rational use of resources and return a blue sky and white clouds to the local area.
In view of the calcining process and technical conditions suitable for magnesite powder and flotation powder, Liaoning Dongda Powder Engineering Technology Co., Ltd. combined with the calcining experience of various powder materials, developed and designed the new technology equipment of flash swirling dynamic calciner. It embodies the superior performance of environmental protection and energy saving and the stable and controllable performance of product quality. It has raised the calcination process of my country's magnesite industry to the international advanced level, filled the gap in the country, and obtained a national patent.
According to the basic physical and chemical changes of magnesite during the calcination process: one is the thermal decomposition of magnesite, and the crystallization of periclase crystals grows; the other is that under the action of high temperature, the interaction between impurity chlorides or impurity oxides and MgO forms new minerals.
Magnesite powder or flotation concentrate powder adopts the new technology equipment of flash gas suspension calciner to obtain high-grade light-calcined active magnesium oxide: the superior performance of this system equipment is fully reflected in the heat treatment of powder materials; firstly, the raw powder or wet powder is quickly dispersed and dehydrated to ≤1% by using the waste heat of calcination, and the original particle size is restored. The particles are fully thermally decomposed and reacted in the rotating upward airflow at 950-1000°C. The particles are heated at a high temperature and release CO2 and crystal water instantly to form porous magnesium oxide particles. The calcination process is completed in 3-5 seconds without over-burning or under-burning. The new calciner is equipped with energy-saving and emission-reducing technology to achieve clean production, and it can also be applied to the calcination of flotation tailings. The calcined tailings powder has greater activity and specific surface area, and is more effective when used in flue gas desulfurizers, high-strength construction cement, and fireproof materials.
From the perspective of mineral deep processing methods, the current better process is to use first grinding and then calcining or flotation to increase the main grade of magnesium and then calcining. The key is powder calcining equipment. It is very important to need an advanced calcining technology equipment that is more in line with technical conditions. First of all, environmental protection, energy saving and emission reduction and low operating costs are required. It is necessary to ensure thermal decomposition rate and activity of lightly calcined powder and recovery efficiency of powder. It is viscous and fine powder is easy to form agglomeration phenomenon; the traditional equipment commonly used in China at present includes light-fired vertical kiln, rotary kiln, fluidized fluidized kiln, suspension roasting furnace, multi-layer roasting furnace, and reflection kiln. Grinding and grading are prone to moisture absorption and secondary pollution in the follow-up process. The above-mentioned equipment has defects of varying degrees, and the product quality is unstable. It is necessary to solve the technical problems of mineral calcination in this industry as soon as possible, and update them to make rational use of resources and return a blue sky and white clouds to the local area.
In view of the calcining process and technical conditions suitable for magnesite powder and flotation powder, Liaoning Dongda Powder Engineering Technology Co., Ltd. combined with the calcining experience of various powder materials, developed and designed the new technology equipment of flash swirling dynamic calciner. It embodies the superior performance of environmental protection and energy saving and the stable and controllable performance of product quality. It has raised the calcination process of my country's magnesite industry to the international advanced level, filled the gap in the country, and obtained a national patent.
According to the basic physical and chemical changes of magnesite during the calcination process: one is the thermal decomposition of magnesite, and the crystallization of periclase crystals grows; the other is that under the action of high temperature, the interaction between impurity chlorides or impurity oxides and MgO forms new minerals.