Zinc oxide rotary kiln temperature and refractory service life

The working principle of zinc oxide rotary kiln/zinc oxide volatilization kiln is to use the characteristics of metal zinc, cadmium, lead and cadmium sulfide and lead oxide to have high vapor pressure at high temperature, so that zinc, lead, cadmium and other metals can The oxide form is converted into volatiles, and the copper and precious metals are transferred to the kiln slag. Additional slag is then used to recover these metals from volatile matter and kiln slag. According to the temperature gradient, the kiln is divided into drying zone (600~700℃), preheating zone (700~1000℃), reaction zone (1100~1200℃) and cooling zone (650~750℃).

Zinc oxide refractory materials for rotary kiln

1. Drying zone: clay bricks, high alumina bricks

2. Preheat zone: high alumina bricks, magnesia-alumina spinel bricks

3. High-temperature reaction zone: special phosphate bricks, magnesia-alumina spinel bricks, magnesia-chrome bricks, alumina-chrome bricks

4. Cooling zone: high alumina bricks, magnesia-alumina spinel bricks

Service life of refractory materials in zinc oxide rotary kiln

The life of clay bricks in the high-temperature reaction zone of zinc leaching residue volatilization kiln is only about a few days, high-alumina bricks ten to twenty days, and magnesia-alumina bricks more than a month. Magnesia bricks last for more than 2 months, and alumina-magnesia bricks last for more than 3 months. Now there are phosphate composite bricks on the market with a density of more than 2.8, which last about 5 months.