The process of separation of the coarse liquid desiliconization and silicon slag in the alumina plant is one of the key processes to ensure the quality of the alumina produced. Because the desiliconization and refining process uses hydrofluoric acid as the raw material, it is necessary to strictly control and monitor the alumina plant’s use of hydofluoric acid and the desiliconization and silicon slag separation process.
The purpose of separating the desiliconization and silicon slag in the alumina plant is to prevent the hot liquid from damage to the lining and steel shell, reduce the aluminum content in the silicon slag, reduce power consumption, increase bauxite resources, and reduce environmental pollution. The desiliconization process uses hydrofluoric acid as the raw material. In addition to hydrofluoric acid, other additives are also required to separate coarse liquid desiliconization and silicon slag.
The design of the alumina plant separates the coarse liquid desiliconization and silicon slag into several devices, such as hot settling tanks, cooling systems, pulp pumps, desiliconization towers, flash tanks, and cooling fans. The hot settling tank is used to remove coke, particles, and some impurities in the quartz-bearing bauxite. The cooling system is used to reduce the temperature of the bauxite. The pulp pump is used to deliver the bauxite to the desiliconization tower. The desiliconization tower is the key device for desiliconization. Hydrofluoric acid and other additives are added to the quartz-bearing bauxite in the tower, and when heated, the quartz is hydrolyzed and separated. The silicon slags and aluminum-containing liquids are then separated in the tower. The flash tank is used to separate the hydrofluoric acid and other liquids and impurities. The cooling fan is used to cool the bauxite and separate the aluminum-containing liquid and silicon slag.
In order to ensure the quality of the alumina produced, the alumina plant needs to strictly control the desiliconization and silicon slag separation. The temperature, time, and concentration of the hydrofluoric acid need to be strictly monitored and adjusted. The feed material needs to be filtered and checked for impurities. The aluminum content in the silicon slag needs to be regularly checked. Finally, environment protection measures should be taken to prevent the leakage of hydrofluoric acid.
In conclusion, the design of the alumina plant for separating coarse liquid desiliconization and silicon slag is a complex process. It requires strict control, monitoring, and adjustment to ensure the quality of alumina produced. Moreover, due to the high risk of hydrofluoric acid, safety and environmental protection measures need to be taken to minimize the risk of accidents and environmental pollution.
