Process Research on Preparation of Sodium Silicate from Landfill Humus
In order to realise the resourceful use of landfill humus,the humus from a domestic waste landfill in Shenzhen was taken as the raw material to replace quartz sand,and a combination of dry and wet production process was adopted to prepare high modulus and high quality industrial water glass.The results showed that the humus was an ideal silica source for the preparation of water glass,the content of silica in the silica gel after acid leaching could reach 72.81%.When the mass ratio of sodiun carbonate to humus was 1∶1,the calcination temperature was 850℃,the calcination time was 120 minutes,the liquid-solid ratio was 8,the concentration of NaOH was 2%,the hydrothermal temperature was 160℃,and the hydrothermal time was 4 hours,the high-modulus water glass with a modulus of 3.03 could be prepared,which reached the standard of superior quality as stipulated in the industrial liquid waterglass L280-41 of GB/T 4209-2022 Sodium Silicate for Industrial Use.
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