硅砂、陶粒砂和宝珠砂铸造工艺性能研究

Study on Casting Performance of Silica Sand,Ceramsite Sand and Ceramic Foundry Sand

研究了鄂尔多斯硅砂、通辽硅砂、海南海砂、陶粒砂和宝珠砂的形貌,用其做原砂的碱酚醛树脂砂的抗拉强度,原砂抗机械破碎和粉化能力等。结果表明:鄂尔多斯硅砂形貌最差,呈尖角、片状;通辽砂、海砂较好,呈圆形、多角形;陶粒砂和宝珠砂最好,呈圆形。型砂24 h时抗拉强度,鄂尔多斯硅砂最低,只有0.277 MPa;通辽硅砂和海砂较高,接近0.6 MPa;宝珠砂最高,接近0.9 MPa;陶粒砂为0.667 MPa,高于硅砂,低于宝珠砂。经机械搅拌破碎试验得出:鄂尔多斯硅砂强度较低,抗破碎能力最差,易破碎粉化,粉尘含量由0.03%提高到0.812%;通辽硅砂和海砂强度都较好,粉化较轻,粉尘含量由0.016%提高到0.32%;陶粒砂强度也较好,粉化较少,粉尘含量由0提高到0.195%;宝珠砂破碎和粉化率极低,粉尘含量基本无变化。

The morphology,mechanical crushing resistance and pulverization resistance of Ordos silica sand,Tongliao silica sand,Hainan sea sand,ceramsite sand and ceramic foundry sand,as well as the tensile strength of alkali phenolic resin sand using these sands as raw sand,are studied.The results show that Ordos silica sand has the worst morphology,which is sharp and flaky.Tongliao sand and sea sand are good,round and polygonal.Ceramsite sand and ceramic foundry sand are the best,and they are round.Tested 24 h tensile strength of molding sand of using there sands as raw sand,Ordos silica sand is the lowest,only 0.277 MPa.Tongliao silica sand and sea sand are relatively high,close to 0.6 MPa.Ceramic foundry sand is the highest,close to 0.9 MPa.The ceramsite sand is 0.667 MPa,more than silica sand and less than ceramic foundry sand.The mechanical stirring crushing test shows that Ordos silica sand has low strength,the worst crushing resistance,is easy to be broken and powdered,and the dust content increases from 0.03%to 0.812%.Tongliao silica sand and sea sand have good strength and light pulverization,and the dust content increases from 0.016%to 0.32%.The strength of ceramsite sand is also good,with less pulverization,and the dust content increases from 0 to 0.195%.The crushing and pulverization rate of ceramic foundry sand is extremely low,and the dust content remains basically unchanged.