As a high-quality refractory material, magnesium oxide has the advantages of high strength, high melting point, stable properties, and strong insulation. Therefore, it is widely used in various industrial fields such as steel, chemical industry, and construction. Using magnesite and other raw materials, magnesite is smelted in an electric arc furnace, cooled to a molten state, and then fused magnesia is obtained. The fused magnesia is ground and added with certain additives, subjected to appropriate modification treatment, and then screened and iron removed to obtain magnesium oxide powder. HCMilling(Guilin Hongcheng) is a manufacturer of magnesium oxide grinding mill machines. Below is an introduction to the process and equipment for preparing refractory magnesium oxide grinding mill machines using fused magnesia grinding powder.

There are two main processes for preparing refractory magnesium oxide powder from fused magnesia powder, namely, one-step calcination method and two-step calcination method. The specific processes are as follows:

1. Process flow of one-step calcination method: raw material (magnesite with certain requirements) → calcination (using coke in a rotary or shaft kiln, calcining at different temperatures) → different grades of magnesium powder

2. Process flow of two-step calcination method: raw material (magnesite with certain requirements) → light calcination (in suspension calcination kiln, rotary kiln, reverberatory furnace or fluidized bed furnace, using ashless fuel and calcining at different temperatures) → electric fused magnesia grinding powder (the finer the particle size, the higher the purity of magnesium powder) → secondary calcination (in shaft kiln or rotary kiln, calcining at different temperatures) → different grades of magnesium powder

According to the process of grinding refractory magnesium oxide, the lightly burned powder (about 200 meshes) is further calcined to produce magnesia after being pressed into a ball. The quality of the fused magnesia grinding powder is related to the body density of the pressing ball. In order to produce high-quality magnesia, in addition to the content of magnesium oxide, there is also the need to press the lightly burned powder into a high body density ball. To press into a high body density ball, it is necessary to regrind the lightly burned magnesium powder from about 200 meshes to over 400 meshes. In traditional processes, this work is typically accomplished using a ball mill plus a powder concentrator, which poses many problems:

1. Due to the fact that the grinding medium is steel balls and the material entering the grinding process is powdery (about 200 meshes), the noise is too high and the iron consumption is high, which has a large iron content in the finished magnesium powder (the iron content of the magnesium powder increases) and affects the product quality.

2. The grinding medium for ball mill electromechanical fused magnesia grinding powder contains nearly 100 tons of steel balls. When the mill is rotating, it has a large amount of useless work and high energy consumption.

The above two major issues have been plagued by high-purity magnesia production enterprises. In response to this problem, HCMilling(Guilin Hongcheng) organized engineering and technical personnel to overcome the technical difficulty of vertically grinding powdery materials into a material bed based on the characteristics of light burned magnesium oxide, and developed a HLM series magnesium oxide vertical grinding mill. The process characteristics of this magnesium oxide grinding mill machine in the refractory magnesium oxide grinding process are as follows:

1. HLM magnesium oxide vertical grinding mill machine operates smoothly, with low noise, and a clean workplace environment.

2. Due to the grinding method of the magnesium oxide grinding mill, there is basically no iron consumption and the product is pollution-free.

3. The working principle of magnesium oxide grinding mill machine is that it does not need to drive heavy grinding bodies, with high power utilization rate and 50% energy accumulation compared to ball mills.

4. The fineness control of the finished product of the magnesium oxide grinding mill machine is convenient and flexible, and it is only necessary to adjust the rotor speed of the powder concentrator (from 325 mesh to 1000 mesh) to flexibly produce the fineness of the finished product.

5. Small footprint, requiring only 50% of the ball mill.

The system adopts PLC control, and the operation of all equipment enters the operation screen, reducing labor intensity and operators.

Preparation of refractory material from fused magnesia grinding powder The HLM magnesium oxide grinding mill machine is used in the magnesium oxide grinding process, which solves a major problem in the fine processing of high-purity magnesium oxide and greatly improves the output of magnesium oxide grinding powder. If you have a need for fused magnesia grinding, or want to learn more about the process details of refractory magnesium oxide grinding mill machines, please contact mkt@hcmilling.com or call at +86-773-3568321, HCM will tailor for you the most suitable grinding mill program based on your needs, more details please check www.hcmilling.com. Our selection engineer will plan scientific equipment configuration for you and quote for you.