| abstract |
Manufacturing method of a magnesium-aluminum spinel brick, wherein said magnesium-aluminum spinel brick comprises a flame retardant coating and a thermal insulation layer, the specific manufacturing steps are as follows: (1) Preparation of raw materials of the flame retardant coating: the content of the respective components is expressed in percentage by mass, 40% ∼ 70% of sintered magnesia of granularity <= 5 mm, 10% ∼ 40% of molten magnesia of granularity <= 3mm, 10% ∼ 20% magnesium-aluminum spinel of granularity <= 4mm, 0% <corundum <= 10% granularity <= 2mm are mixed evenly to prepare mixed powder of flame retardant coating raw materials, then additionally 1% ∼ 5% naphthalene binder is added taking the mixed powder of flame retardant coating raw materials as the base, the flame retardant coating raw materials will ama are prepared after mixing evenly; (2) Raw material preparation of the thermal insulation layer: the content of the respective components is expressed in percentage by mass, 40% ∼ 60% forsterite, 10% ∼ 40% fayalite, 10% ∼ 50 % magnesia are selected to mix uniformly, 1% ∼ 5% naphthalene binder is added taking the mixed powder as base, molded by friction press, dried at 110ºC∼ 150ºC, baked at high temperature above 1000 ° C to obtain aggregate composite hortonolite raw materials; Aggregate composite hortonolite of granularity <= 5mm is used as the sole raw material, additionally 1% ∼ 5% naphthalene binder is added, uniformly mixed to prepare raw materials of thermal insulation layer; (3) The flame retardant coating raw material and the heat insulation layer raw material mentioned above are spaced and loaded into a mold using thin corrugated iron sheets, pressed to give fresh bricks by pressing machine , they are kept at a temperature of 110 ° C for 24 hours, dried and fired to give magnesium-aluminum spinel bricks at a temperature of 1550 ° C∼ 1750 ° C in a tunnel kiln; wherein the sequence of step (1) and step (2) can be reversed. |