煤矸石中高岭土的分选及煅烧增白试验研究.pdf



✗ˈᖃ❵✗ᶑԦ䘹ᤙޕᯉ㋂ᓖ D90 Ѫ μmǃ❵✗⑙ᓖѪ 950 ćǃᚂ⑙ᰦ䰤Ѫ 3 h
ᰦˈ❵✗ӗ૱Ⲵⲭᓖਟ䗮 %DŽ
Ӿ䈅傼⹄ウ㔃᷌ᶕⴻˈሩ➔⸨⸣䘋㹼⿫ᗳ࠶䘹-᩷ᒺ࠶䘹㚄ਸ䘹ⸯ㜭ཏ㝡䲔䜘࠶䫱
઼䫋㊫㠤㢢ᵲ䍘ˈᨀ儈儈ዝ൏Ⲵ❵✗ⲭᓖDŽሩ࠶䘹ਾⲴ儈ዝ൏䘋а↕㓶⼘ǃ儈⑙❵✗ˈ
㜭ཏ൘ᖸབྷ〻ᓖкᨀ儈儈ዝ൏Ⲵ❵✗ⲭᓖˈѪࡦ༷Ո䍘儈ዝ൏ӗ૱ᨀ׋ᐕ㢪ᯩṸDŽ
ީ 䭤 䈃φ➔⸨⸣˗儈ዝ൏˗ᐕ㢪ⸯ⢙ᆖ˗᩷ᒺ࠶䘹˗⿫ᗳ࠶䘹˗❵✗໎ⲭ
⹊ガ㊱ශφᓄ⭘⹄ウ

theoretically, the calcination whiteness of the product can reach more than 85%, and the
yield can reach %.
The optimum processing condition of table separation is determined. When the angle is
5°, the stroke is 10 mm and the runs frequency is 350 times/min, the calcination whiteness
of the kaolin product reaches the highest value of % and the yield is %. The mass
rate of Al2O3 is %, and the recovery of Al2O3 is %. And the total removal rate of
TiO2 and Fe2O3 reaches %.
The results of centrifugal separation test show that when the rotary speed is 800 r/min,
the feeding speed is L/min, the feeding concentration is 20% and feeding time is 100 s,
the calcined whiteness of kaolin product reaches the highest value of % and the yield
is %. The mass rate and the recovery of Al2O3 are % and %, respectively.
And the total removal rate of TiO2 and Fe2O3 is %.The whiteness of kaolin can be
improved obviously by high temperature calcination. And the whiteness of the calcined
product can reaches % when the mass rate of particle size less than mm reaches
90%, the calcination temperature is 950 ć and the constant temperature time is 3 h.
The experimental results show that some iron and titanium impurities can be removed
from coal gangue by centrifugal separation and table separation. Further fine grinding and
high temperature calcination of kaolin after separation can improve the calcination
whiteness of kaolin to a great extent. The research could provide a technological scheme for
the preparation of high quality kaolin products from coal gangue which will