A method for preparing high thermal shock magnesia raw material by compounding middle-grade magnesia and fused magnesia
A technology for fused magnesia and magnesia, which is applied in the field of compounding medium-grade magnesia fused magnesia to prepare high thermal shock magnesia raw materials, can solve the problem that the density is difficult to achieve high-performance products, reduce the service life of refractory materials, and reduce the MgO content Low problems, to achieve good thermal shock stability and erosion resistance, enhanced erosion resistance, good thermal shock resistance
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Embodiment 1
[0019] Take 45 parts of mid-grade magnesia powder with MgO content of 95.4%, 50 parts of fused magnesia with MgO content of 97.2%, and Mg(OH) with a concentration of 1.0mol / L 2 5 parts of sol, the specific operation steps are as follows:
[0020] Finely grind the mid-grade magnesia powder to below 200 mesh, crush the fused magnesia to a particle size of 0.5-1mm; put the above two materials into the mixer together, and mix the Mg(OH) 2 The sol is equally divided into 5 parts and added to the mixer in turn, and mixed for 10 minutes; the mixed material is put into a briquetting machine and pressed into balls at 20MPa with a diameter of 40mm to obtain a green magnesia ball; Dry in a dryer at 110°C for 10 hours until the moisture content is less than 1%, to obtain dry green magnesia balls; place the dried green magnesia balls in a vertical kiln at 1450°C for 3 hours to obtain composite high thermal shock magnesium Sand raw material.
[0021] Test the bulk density of the sample ac...
Embodiment 2
[0023] Take 35 parts of mid-grade magnesia powder with MgO content of 95.7%, 60 parts of fused magnesia with MgO content of 97.9%, and Mg(OH) with a concentration of 0.75mol / L 2 5 parts of sol, the specific operation steps are as follows:
[0024] Finely grind the mid-grade magnesia powder to below 200 mesh, crush the fused magnesia to a particle size of 0.5-1mm; put the above two materials into the mixer together, and mix the Mg(OH) 2 The sol is equally divided into 5 parts and added to the mixer in turn, and mixed for 10 minutes; the mixed material is put into a briquetting machine and pressed into balls at 22.5MPa, the diameter of the ball is 40mm, and the green magnesia ball is obtained; the magnesia ball is green Dry in a dryer at 110°C for 10 hours until the moisture content is less than 1% to obtain a dried magnesia ball green body; place the dried magnesia ball green body in a vertical kiln at 1550°C for 3 hours to obtain a composite high thermal shock Raw material of...
Embodiment 3
[0027] Take 28 parts of mid-grade magnesia powder with MgO content of 96.1%, 70 parts of fused magnesia with MgO content of 98.5%, and Mg(OH) with a concentration of 1.25mol / L 2 2 parts of sol, the specific operation steps are as follows:
[0028] Finely grind the mid-grade magnesia powder to below 200 mesh, crush the fused magnesia to a particle size of 0.5-1mm; put the above two materials into the mixer together, and mix the Mg(OH) 2 The sol is equally divided into two parts and added to the mixer in turn, and mixed for 10 minutes; the mixed material is put into a briquetting machine and pressed into balls at 25MPa, and the diameter of the ball is 40mm to obtain a green magnesia ball; Dry in a dryer at 110°C for 12 hours until the moisture content is less than 1%, to obtain dry green magnesia balls; place the dried green magnesia balls in a vertical kiln at 1650°C for 3 hours to obtain composite high thermal shock magnesium Sand raw material.
[0029] Test the bulk density...
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