METHOD FOR PREPARING MAGNESIUM OXIDE-BASE PRODUCTS Russian patent published in 2007 - IPC C01F5/06 

FIELD: inorganic chemistry, chemical technology.

SUBSTANCE: invention relates to producing refractory and insulating materials and can be used in preparing melted periclase. Method for producing magnesium oxide-base products involves grinding natural magnesite, its charge into metallic chamber wherein ultra-high frequency energy flow is added along its axis from charge side and ultra-high frequency charge plasma is excited inside of charge. Magnesite is heated by this plasma firstly to its decomposition point 300-400°C, then gas is pumped out from chamber to pressure value less of partial pressure of carbon dioxide corresponding to magnesite temperature about 400°C and prepared mixture of magnesite and magnesium oxide is heated by ultra-high frequency plasma to magnesite decomposition point 500-600°C. Evolving carbon dioxide is pumped out into collector and gas pressure in chamber is maintained as equal to gas partial pressure corresponding to magnesite temperature 400-500°C, gas pumping out into collector is stopped after onset falling pumping out gas flow value followed by adding air to atmosphere pressure and material is heated by ultra-high frequency plasma to temperature 1500°C to yield magnesium oxide and prepared products are cooled. After preparing magnesium oxide gas is pumped out from chamber to presser less 1 tor and magnesium oxide is heated to temperature above 1500°C by ultra-high frequency plasma up to preparing melted periclase. Ultra-high frequency of plasma is carried out in impulse regimen. Invention provides simplifying process and to decrease energy consumption.

EFFECT: improved preparing method.

3 cl, 2 ex