Physical properties of magnesium hydroxide

Weigh the sample about 400mg which was dried at 105 ℃ for 2 hours, and transfer it into the conical flask. Add 25.0ml of lmol/l sulfuric acid, add several drops of methyl red test solution (ts-149) after completely dissolving, titrate the excess acid with 1mol/l sodium hydroxide. The volume of 1mol/l sulfuric acid equivalent to the calcium oxide content (see quality index) in the sample is subtracted from the volume of 1mol/l sulfuric acid consumed, and the difference is the volume of 1mol/l sulfuric acid equivalent to Mg (OH) 2 content in the sample. Each ml of 1mol / L sulfuric acid is equivalent to 29.16mg or Cao 28.04mg of Mg (OH).


Technical index: Index Name: type I type II magnesium oxide content /% ≥ 63.062.0 calcium oxide content /% ≤ 1.01.0 acid insoluble content /% < 0.21.5 water content /% ≤ 2.53.0 chloride (calculated by cl-s) /% /% = 0.150.4 iron (FE) content /% = 0.25 - burning loss /% = 28.0 --- sieve residue (75 μ M test screen) /% < 0.51.0