Natural and synthetic raw materials for magnesium-chromium refractories, natural magnesite (containing synthetic magnesite) natural magnesite (including synthetic magnesia) and chrome ore are the basic raw materials for producing magnesium-chromium refractories. In addition, artificial synthesis of raw materials, a sintering synthesis of magnesium and chromium materials and fused synthesis of magnesium and chromium materials. The quality of raw materials seriously restricts the performance of products. To directly combine the microstructure of the magnesium-chromium refractories to the direct combination between the periclase solid solution periclase solid solution and the periclase solid solution spinel solid solution, it is necessary to have a high-purity raw material, which is to produce directly bound magnesium chromium. Prerequisites for bricks.
China's chromium ore resources are poor, and it is necessary to meet the needs of the metal smelting and chemical industries first. The content of chromium ore impurities used as raw materials for refractory materials is relatively high. China currently does not have any industrial-scale ore concentrate ore, and chromium ore concentrates in Xinjiang and Tibet. The South African chromium concentrate (concentrate) is characterized by low impurity content and high iron oxide content. Every year, our factory imports a considerable amount of South African chrome ore as refractory material. The chrome ore used by our company is mainly chrome ore from South Africa, high chrome ore from Tibet, high chrome ore from Xinjiang, and chrome ore. For comparison purposes, the chromium ore used by our company and several typical chromium ore deposits in the world, the Xinjiang chromium ore (low chromium), Tibet chromium ore (high chromium) and South African chromium ore (concentrate) used by our company, The chromite concentrate in the Philippines is an ideal refractory raw material for the production of mid-range and high-grade magnesium-chromium refractories.
Synthetic raw materials With the development of smelting technology, the refractory materials used in the harsh parts of the furnace lining are required to be higher and higher. In order to meet the requirements of smelting technology, Lowe also developed high-quality and high-performance artificial synthetic raw materials, mainly sintered synthetic magnesium chromium. Sand and fused synthesis of magnesium-chromium sand, magnesium chrome refractories of the structure and performance of magnesium chrome brick variety, the name is very chaotic, easy to confuse, in accordance with a more standard method to illustrate.
Directly combined with the continuous development of high-temperature firing technology, the maximum firing temperature of the ultra-high temperature tunnel kiln exceeds 1800e, and the molding equipment of the refractory material has exceeded 1000t, and vacuum can be applied to the beneficiation of raw materials. The impurity content of magnesia and chromium ore is greatly reduced, creating a material basis for the direct production of magnesite-chromium bricks, so a new generation of magnesium-chromium refractories is directly combined with magnesia-chromium refractories, and directly combined with magnesia-chromium refractories. The characteristics are: brick periclase (solid solution)) periclase (solid solution) and periclase (solid solution) spinel (solid solution) has a high degree of direct bonding, resistance to slag erosion, high temperature volume stability, now Widely used in non-ferrous metallurgical furnaces. Flux recombination of magnesium chromium (electrolysis and recombination of magnesium and chromium) With the continuous enhancement of nonferrous metal smelting technology, it is required that the refractory material has better corrosion resistance and higher high-temperature strength, and the density of sintered synthetic high-purity magnesium-chromium materials needs to be further increased. Reducing porosity, making magnesia and chromium ore (light magnesium or magnesite and chromium ore) fully and uniformly react to form a more ideal structure of periclase solid solution and spinel solid solution, resulting in fused synthetic magnesium Chromium materials, bricks made of this raw material are called fused grains and then combined with magnesium chrome bricks. The bricks are characterized by low porosity, high compressive strength, good corrosion resistance, and high temperature strength.
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