The difference between heavy and light burned magnesia

Sintered magnesite is mainly made of magnesite, magnesite or magnesium hydroxide extracted from sea water after calcination at high temperature. Strong hydration resistance. CO2 is released when the magnesite is calcined at 700-950 ℃. The resulting magnesite is a soft porous loose substance and cannot be used as refractory. The magnesite calcined at 1550-1600℃ is called sintered magnesite. The burnt magnesite fired from natural magnesite is called sintered magnesite by using one-time calcining or two-step calcining process of high-temperature equipment such as vertical kiln and rotary kiln. Sintered magnesia is divided into 18 grades according to its physical and chemical indexes.

When magnesite is calcined at 1800℃, carbon dioxide completely escapes and magnesite forms a compact block of calcined magnesite, which is weighed and burned (also known as sintered magnesite). This magnesite has high refractoriness. Its main component is magnesium oxide, which is made of natural extra-grade magnesite by flotation purification, light burning, fine grinding, high-pressure pressure ball and ultra-high temperature oil calcined in vertical kiln.

Light burned magnesia is a folding, pressure resistant, high strength, gas hard, cementitious material, widely used in national defense, medicine, chemical, paper, shipbuilding and other industries. In the building materials industry can be made tire board, particleboard, heat preservation column, railing, artificial marble, asbestos tile, ordinary tile, wallboard, laid ground. With the progress of science and technology, light burning magnesium powder is more widely used in civil products, heavy and heavy machinery packing boxes, bottom beam packaging, high temperature refractory materials, but also can produce beautiful and generous bright strong furniture, in the mechanical industry can be made as a casting model.

Calcination or electrosmelting of natural magnesite, from sea water, salt lake brine, and from dolomite, serpentine and magnesite. The high grade natural magnesite, light fired magnesia powder or other materials containing magnesia are used as raw materials. After melting in the arc furnace, natural cooling is carried out to make the calcined magnesite crystal grow from the melt. After cooling, remove the less molten mass on the block, the frit is electrofused magnesia. Underfired material can be returned to the arc furnace. Frits are sorted and broken into the required market size.