Production of Titanium Dioxide by Sulfuric Acid Method--Hydrolysis of Titanium Solution (5)

    Twenty-eight, sedimentation rate and its determination method, method for measuring the quality of hydrolysis
Partial speed degree titanate particles settling velocity of the slurry after hydrolysis called sedimentation rate. It is a value that reflects the quality of the hydrolysis and the size of the metatitanic acid particles. The sedimentation rate is high, and the particle size of the metatitanic acid particles is fine; the sedimentation rate is low, and the particle size of the metatitanic acid particles is coarse.
The method for determining the sedimentation rate is as follows: take 125 mL of the hydrolysis slurry, add a 500 mL measuring cylinder with a grout, add water to 500 mL, shake well, let stand for 1 h, and record the scale (mL) at the liquid-solid interface of the sedimentation slurry, ie It is the sedimentation rate.
To measure the quality of hydrolysis, generally three methods of hydrolysis rate, sedimentation rate and filtration rate are used. The first two methods have been described above. The filtration rate is a quantitative amount of the hydrolyzed slurry, which is suction filtered in a Buchner funnel and measured for the time of drying, in seconds. If the filtration time is long, the filtration speed is slow. In this case, a small amount of aminomethylated modified polypropylene guanamine precipitant may be added to the pot hydrolysis slurry corresponding to the sample to be treated.
Twenty-nine, the effect of various hydrolysis factors on hydrolysis rate and product quality
The effects of various hydrolysis factors on hydrolysis rate and product quality are shown in Table 3.

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