Fused magnesia carbon brick is one of the most widely used magnesia refractories at present. It is an ideal lining material for converter, electric furnace ladle slag line. Its main raw auxiliary materials are fused magnesia, graphite phenolic resin. There are many air pollution sources of converter magnesia carbon brick. If necessary pollution prevention measures are taken, serious pollution will be caused to the ambient air quality. Therefore, in-depth analysis is needed It is very necessary to put forward feasible air pollution prevention control countermeasures. 2. Analysis of main air pollution sources

Fused magnesia carbon brick

The production process of fused magnesia carbon brick is mainly composed of raw material crushing screening process, mixing refining process, pressing forming process, drying firing process inspection packaging process. the production process of fused magnesia carbon brick, it can be seen that almost every process in the whole production process of fused magnesia carbon brick has produced waste gas. Now it is corresponding to the specific analysis of the production process of fused magnesia carbon brick As follows:

2.1 crushing, crushing screening process: as the raw material fused magnesia needs to be crushed, crushed, screened ground, the treated magnesium sand has a small particle size, so a large amount of dust-containing waste gas will be generated in the above-mentioned operations transportation process. 2.2 mixing refining process: this process is the operation process of mixing raw powder granular materials after crushing screening with graphite, phenolic resin other auxiliary materials. Therefore, a large amount of process dust is generated in the weighing, discharging mixing process of this process.

2.3 pressing forming process: this process is the production operation process of stamping mixed materials, a certain amount of dust is generated during the stamping process.

2.4 drying process: due to the addition of phenolic resin in the production process of fused magnesia carbon brick, formaldehyde, phenol other volatiles volatilize during the mixing drying process of the brick. Because the mixing is carried out at normal temperature, while the drying kiln is heated by electricity, the temperature is raised according to a certain drying curve, the temperature is kept at 200 ℃ for 4-6 hours. Therefore, the volatile matter of resin is mainly volatilized in the drying kiln, that is, a large amount of formaldehyde phenolic organic volatiles are produced in the drying kiln.

2.5 inspection packaging process: in the process of shaping brick blank with brick grinder brick cutter, the brick layer that has been cut off is broken into powder forms dust under the disturbance of air. In addition to the above production processes, dust will also be generated during the storage transportation of raw materials. The dust is mainly generated in the process of loading, unloading, stacking transportation of raw materials, its main component is MgO.