2) nhom ng lieu cung cap;sio2 ,AL2O3,fe2o3.
*dac djem chung; tp khoang chjnh of dat set la caolinit (al2o32 SIO2 2h2o la chu yeu)ngoai rab con co cac khoag.
ngoai ra con co 1 so tap chat nhu de la cay ,xac dong vat va 1` so tap chat vo co khac .vd :fes,fes2,sio2 o dang cat.
*yeu cau ki thuat of dat xet trong cnsxxm.
-tp khoang set >,= 70%.
-ham luog sio2 =55-75%.
- AL2O3 = 10-20 %.
- so3 <1%.
- R2O <1%.
- fe2o3 =4-10%.
- Tio2<.=1,5%.
*YEU cau t/c vat ly.
- do am ;10-30% (tuy thoe thoi tiet).
-do deo ;tuog doi lon de CLK co the vê thanh vjen de dang.
-ti trog khoang 1,8-2,0 T/m3
-do cung <,= 3 (theo thang do morth)
co the chap nhan do cung >3 doi voi da set neu do la nguon dat caosilic dung de bo sung ham luong oxitsilic do nguon set chinh voi ham luong bo sung <5% loai dat caosilic yeu cau co ham luong sio2>80%
*))phan loai da set.
2.1 ho dat set
- co hat co tren 50% co hat mjn (<,=0,01 mm).
-do deo >,= 17.
- ham luong sio2 = 55-60%.
-do am 15=30%.
=> loai dat set nay fu hop de sx xm theo phuong phap uot.
2.2 ho cao lanh
=loai dat set7 co mau trang lan 1 jt tap cahy la trangb thach va cat thach anh .
-AL2O3 =15-20% .
fe2o3 <2%.
-do am =10-30%(tuy thoi tiet)
-ty trong ;2,6-3,68 T/m3.
=> loai dat nay thuong ko su dug sxxm ma thuong dung de sx do gom xu va pen nhom.
2.3)) ho diep thach(phien set)>
-la dat set dc fan lop thanh tung fien rui tap hop thanh tug lop trog len nnhau ,tao thhanh via mau sac khac nhau (vang, d0 trang)