What is the specific work content of the work before the blast furnace ironmaking? Is it harmful to your health?

Slag ditch iron ditch maintenance, taphole opening, taphole plugging, gunning, preparation of various materials, taphole opening, tuyere stabbing, tuyere changing copper sleeve. . . In short, all miserable jobs! As for the harm to the body, plus what you can think of, it can't be wrong; High temperature, noise, dust, toxic gas, falling injury and mechanical injury. . . Look at the warning signs and you will understand.