烧结陶瓷铸造砂混制粘土砂的性能及特点

Performance and Characteristics of Clay Sand Mixed by Sintered Ceramic Casting Sand

对烧结陶瓷铸造砂和石英砂混制粘土砂时的表现行为进行了试验研究,发现由烧结陶瓷铸造砂和石英砂混制粘土砂的湿压强度随膨润土加入量的增加而提高。在膨润土加入量一定的情况下,型砂的湿压强度和透气性随型砂中水分含量的增加而提高,待达到最大值后,水分继续增加,型砂的湿压强度和透气性降低。在相同膨润土加入量的情况下,由70/140烧结陶瓷铸造砂混制无煤粉和含煤粉粘土砂及由50/100烧结陶瓷铸造砂混制无煤粉粘土砂的湿压强度低于相同条件下由石英砂混制相应粘土砂的湿压强度,由50/100烧结陶瓷铸造砂混制含煤粉粘土砂的湿压强度等于或略低于由石英砂在相同条件下混制含煤粉粘土砂的湿压强度。在相同工艺条件下,由烧结陶瓷铸造砂混制粘土砂的透气性高于由石英砂混制粘土砂的透气性。

The surface behavior of clay sand mixed by sintered ceramic casting sand and quartz sand was studied. It was found that the wet compressive strength of clay sand mixed by sintered ceramic casting sand and quartz sand increased with the addition of bentonite. In the case of a certain amount of bentonite, the wet compressive strength and permeability of the molding sand increased with the increase of the moisture content in the molding sand;after reaching the maximum values, they would decrease if the moisture continued to be increased. In the case of the same amount of bentonite, the wet compressive strengths of the clay sands with and without pulverized coal mixed by 70/140 sintered ceramic casting sand, as well as without pulverized coal mixed by 50/100 sintered ceramic casting sand were lower than those of corresponding clay sand mixed by quartz sand under the same conditions;the wet compressive strength of the clay sand containing pulverized coal mixed by 50/100 sintered ceramic casting sand was equal to or slightly lower than that mixed by quartz sand under the same conditions. The permeability of the clay sand mixed by sintered ceramic casting sand was higher than that mixed by quartz sand under the same process conditions.