Study on CO2 Hardening Process of Sodium Silicate Sand by Negative Pressure Blowing
Author of the article:LIU Wei;XU Rongfu;SUN Qingzhou;YANG Minghua
Author's Workplace：Calderys China Co.,Ltd.,Suzhou 215600,China;School of Materials Science and Engineering,Shandong Jianzhu University,Ji'nan 250101,China
Key Words：sodium silicate sand CO2 hardening process hardening strength negative pressure hardening process
Abstract：
Taking sodium silicate sand as the research object,the technological properties of CO2 hardening sodium silicate sand under different technological conditions were studied.The influence laws of hard permeability,hardening uniformity,tensile strength and surface strength of sodium silicate sand using traditional and negative air blowing methods were studied under different conditions of blowing pressure,blowing time,adding amount of sodium silicate and different sample thickness.The results show that under the negative pressure condition,when the blowing time of CO2 gas is 30 s,the blowing pressure is 0.20 MPa,and the amount of sodium silicate is 6%,the surface strength of sodium silicate sand is the highest,and its maximum surface hardness is(89),with the best hard permeability and uniform hardening.The highest tensile strength of process sample is 2.73 MPa and the best hardening effect.
