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  • product name: commercial scale zeolite production process 4A zeolite production line
  • Product number: zeolite production line
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Hydrothermal process 4A zeolite production line
Sodium aluminate solution and sodium silicate solution are used as raw material to prepare 4A zeolite. After blending and heating of the raw material, slurry preparation,crystallization, separation and drying processes,high quality 4A zeolite is gained with whiteness≥96, particle size that below 4um ≥90%, Calcium exchange ≥295.
1. 4A zeolite features and usage
4A zeolite,also called molecular sieve,is a white solid powder, its chemical component is sodium silicoaluminate.It has exellent Ca2+ exchange capacity due to the special structure and appearance.It shows excellent performace when atcs as detergent additive because of the good dispersibility,nontoxicity and no precipitation appearance.
2. Flow chart

2. Process Index
NT:81±2g/l
AO:49-52 g/l
Slurrying temperature:≤68℃ 
Crystallization temperature:87±3℃
Crystallization time:110min
Guiding agent:120l/tank
Belt press:Solid in feed ≥130 g/l, Moisture in cake≤43%
OK filter press:Solid in feed:35-40%, Feed temperature:≤85℃
Moisture in cake:≤21%
Mixture calculation: sodium silicate: (by specific gravity)
Concentrated sodium silicate: d: 1.38, water: d: 1.0
Diluted sodium silicate: d: 1.18
1.38X+1.0Y=1.18(X+Y)
X/Y=0.9
(By SiO2)Concentrated sodium silicate: d: 1.38, SiO2%:26%,
Diluted sodium silicate: d: 1.18, SiO2%:14.8%
1.38×26%×X=1.18×14.8%×(X+Y)
   X/Y=0.9
Mixture liquor:Purified liquor:NT:110g/l    AO:105 g/l  Mother liquor:NT:55g/l    AO:3 g/l  105X+3Y=51(X+Y)
    X/Y=0.89
Slurrying ratio:SiO2/ Al2O3=2.0
Calculations:
1000×1.18×14.8%×X/60  =2
              51 Y/102
             1000×1.18×14.8%×102/51×60×2 = Y/ X                  
Coeffienct:1000×102/60×2=850
Sodium silicate modules: n=[SiO2]/[Na2O]=  SiO2%/60
                            Na2O%/62
3. Technical Index
Calcium exchange ≥295    Particle size(<4um)≥90, Whiteness≥96     PH≤11.0  Igloss ≤21%

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