Classifying and recycling process for waste magnesia carbon bricks produced after use of steel tundish working linings as well as dry material and coating material for tundish
A technology of waste magnesia carbon bricks and working lining, which is applied to the removal of solid waste, etc.
Active Publication Date: 2013-09-25
LAIWU IRON & STEEL GRP
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[0004] The invention aims at the problems existing in the recycling technology of waste magnesia-carbon bricks...
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[0011] A tundish dry material and smear material using waste magnesia-carbon bricks as raw materials. The waste magnesia-carbon bricks raw materials are three particle grades obtained by cleaning, crushing and screening waste magnesia-carbon bricks after ladle lining Recycled materials: Grade A material: 3mm≦particle size<5mm, Grade B material: 1mm≦particle size<3mm, Grade C material: particle size<1mm;
[0012] The mass ratio composition of described tundish dry material is as follows:
[0013] A grade material 5~10%, B grade material 10~15%;
[0014] High-purity magnesia: 3mm≦grain size<5mm 8~15%,
[0015] 1mm≦grain size<3mm 10~15%,
[0016] 0.083mm
[0017] Fused magnesia: 6.5-8% fine powder of 0.074mm
[0018] Micropowder with particle size ≦0.047mm 8~10%;
[0019] 95 mid-range magnesia: 0.074mm
[0020] Al-Mg spinel: particle size≦0.047mm fine powder 3~5%,
[0021] Silicon carbide...
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The invention relates to a classifying and recycling process for waste magnesia carbon bricks produced after use of steel tundish working linings as well as a dry material and a coating material for a tundish. The waste magnesia carbon bricks produced after use of the steel tundish working linings are subjected to recovery processing and are classified into reclaimed materials with three grain levels, i.e., the granularity is more than or equal to 3mm and less than 5mm, the granularity is more than or equal to 1mm and less than 3mm and the granularity is less than 1mm; the reclaimed materials with the granularity more than or equal to 3mm and less than 5mm and the granularity more than or equal to 1mm and less than 3mm are used as raw materials to prepare the dry material for the tundish, and the dry material is used for carrying out continuous casting on a slag line 2 and a tundish wall 3 and a tundish bottom 4 below the slag line 2 of the tundish working lining; the reclaimed materials with the granularity more than or equal to 1mm and less than 3mm and the granularity less than 1mm are used as raw materials to prepare the coating material for the tundish, and the coating material for the tundish is used for carrying out continuous costing on a tundish edge 1 above the slag line of the tundish working lining. The invention further provides a construction method for manufacturing the combined continuous casting tundish working lining by adopting the dry material and the coating material for the tundish. According to the classifying and recycling process, the dry material and the coating material for the tundish and the construction method, the classifying and recycling rate of the waste magnesia carbon bricks produced after use of the steel tundish working linings reaches 100 percent.
Description
technical field [0001] The invention relates to a graded recycling process of waste magnesia-carbon bricks used for ladle working lining, tundish dry material, smear material and application thereof, belonging to the technical field of waste refractory material recycling. Background technique [0002] At present, the recycling rate of magnesia-carbon bricks used in domestic ladle lining is less than 50%. The main way of recycling technology is to develop recycled magnesia-carbon bricks and gunning materials. Regenerated magnesia-carbon bricks such as CN102942372A (201210385242.8) disclose a method for producing regenerated magnesia-carbon bricks using waste magnesia-carbon bricks as raw materials. After processing the waste magnesia-carbon bricks; crush them into 1-5mm particle size crushed materials by jaw crusher or roller method; the ratio of aggregate to powder is 68:32, and the aggregates are crushed materials after magnetic separation and fused magnesia Sand and powde...
Claims
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Inventor 武光君
Owner LAIWU IRON & STEEL GRP
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