The relevant properties of the raw materials will affect the design of the fused magnesium furnace, the choice of control strategies and the formulation of energy saving solutions. 97 fused magnesia Therefore, the introduction and analysis of raw materials is necessary. At present, most of the raw materials used in fused iron furnaces are siderite powder or

Light iron powder, the case is mostly light iron powder.

(1) Before the siderite

For the siderite powder, it is common to use the smelting iron ore on the mine to be pulverized and then directly used as a raw material for other raw materials. Such a raw material is called stellite mineral powder. Natural Ling drink mine, crystal garden trigonal carbonate minerals. Common magnesite powder is grayish white or gray floating yard, its particle size range is generally 0-15mm. Density is between 2.x1i0'kg/m" to 3.1xi"kgym', Mohs hardness is between 3.5 and 45 . Its mineral composition is relatively simple, belonging to calcite, the main minerals are Lingshang ore and dolomite, and the minor minerals are talc. Oblique green stone, there are more minerals such as quartz amphibole. Square pillar stone and limonite pyrite, etc. The chemical composition of magnesite is almost entirely composed of Mgco. In theory, its chemical composition is Mgo 47.82% and co, 52.18%. The chemical components of the impurity portion are mainly: Cao, 810, ra0, and 410. The impurities contained in the new iron ore mine can promote its burning station, but when the content of Qin is large, the refractory properties will be greatly reduced. Therefore, the content of impurities should be limited. Since the Ling drink mine is a carbonate, it is decomposed by calcination. In fact, when the temperature is in the 62 zone, carbon dioxide is partially decomposed. When the average temperature reaches 076, a sufficient decomposition reaction begins, releasing a large amount of carbon oxide, accompanied by a large body and shrinkage. And quality loss. The reaction equation of this process is: At this time, the Mgo generated by the eyebrows is loose, and the real lattice is not established, and the chemical activity is large and the solution is easy. By heating and opening the temperature, the body and the step are reduced, and the chemical activity is also reduced. At the same time, the impurities Cso, 8i0, Pe.o, and 4L0, etc., and ugo are contained to form a compound having a lower melting point. When the temperature reaches above 1910K, the lattice intrusion of MgO is recovered and corrected, and the crystal school grows with the opening of the temperature. The organization is fine. When the temperature reaches 9200K of its lattice point, the quality will be separated step by step, and its chemical and physical properties will be best. After natural cooling, large-sized and high-purity crystals will be obtained. The above process is also the main stage experienced from the entry into the furnace to the output of the finished product. From the temperature and change point of view can be divided into ygco, open temperature process, Mgco, decomposition process, Mgo open temperature process, Mg0 melting process and Mg0 solidification crystallization process.

(2) Light burnt magnesium powder

Selling t, light burnt magnesium will be the ones described above to lock the mine. The product after mild sintering was carried out. Light burning lock powder This material is equivalent to the Lingshou mine: the top of the processing plus IT order. According to the strength of the spine mine slip sintering is divided into heavy iron powder and light iron powder, the scientific name of light burnt magnesium powder is Magnesium oxide, the chemical formula is ugO, commonly known as rhododendron, light burn powder magnesia powder, is a kind of Nz0. As can be seen from the previous discussion, light burnt mirror powder is one of the many changes in Mgo. At normal temperature, the density is 19x18'zg/m', which is yellow powder. Under the action of heat, as the temperature changes. Cooling crystal is the product of electric melting sand. It should be noted that due to the high temperature calcination, there will be a mass loss in the most burning process. In practice, the furnace opening is open and a certain amount of raw materials will be dissipated with the hot gas, and this part is lost in 5% to 10%. about. Judging the degree of sintering of magnesia, the circle is often measured by true density, re-sintering shrinkage and hydration properties. It can also be judged and graded according to the appearance color of the magnesia. The pure Ling lock mineral is white after calcination, and under the influence of impurities and other conditions, such as iron oxide, its color will have a certain brown or tan. When the content is high, the color is close to white and yellow. When the content is high, it is dark brown. When the content is high, it is black.