VA OXIT KEM VIET NAM
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Trong cong trinh nay chung toi trinh bay ket qua nghien ctru trong phong thi
nghiem vd tim dieu kien toi uxi vi nhiet dp. thai gian nung Iirang than de khu ban
sunfat trong quang baritin Ha Bac thanh BaS bang than a nhiet do cao: qua trinh tach loai cac tap chat de dieu che dung dich ZnSO, sach tir ZnO Tuyen Quang: nghien cun anh huang cua pH den qua trinh dong ket tua ZnS \'a BaSO, tir cac dung dich ban sufua va kem sunfat de dieu che Uthopon la sac to trang dung trong con^ nshiep
PRODUCTION OF LITHOPONE FROM BARITIN AND ZINC OXIDE FROM VIETNAM VIETNAM
Trinh Ngoc Chau, Nguyen Thi 'Thuy Hang Faculty of chemistry, Hanoi Universitv of scu-ncẹ VNU
This paper will be presented some experimental results obout: the optimal conditions of temperature, burning time and amont of charbon for process dissolving baritin from Ha bac to banum sulfide, process of removing impnties from ZnO from Tuyen quang for preparing pur solution of ZnS04 and process of precipitation the wihte pigment lithopone from the salt solutions of zinc and barium above
Litopon la mot sac to mau trang quan trong trong cong nghiep. Scm diing sic to
litopon CO nhieu tinh chat tai \'iet: Cac thiet bi kim loai diing loai soil nav co thé tranh
dugc hien tirgng ri do moi truang ben ngoiụ Ngoai ra lithopon con duoc diing lrong cac nganh trang men. gom va diing lam chat don trong cao su dé lam tang sire chiu mai mon no [1,2]. Phuang phap chíi yeu de di6u che lithopon tir truac cho tai nay la thuc hien phan ung trao d6i giiJa BaS va ZnSÔ, trong do nguai ta thuang dimg dung dich ZnSOj CO n6ng do 300 - 3^0 g/1 [3]. Chat krgng \a do trang ciia lithopon phu thuoc
nhieu vao ham luang kem \i\ tap chat co trong no [4] .
Mac dii a nuac ta quang baritin co nhieu a F3ac Giang. Cao Bang. Thanh hoa va
quang kem co a Bac kan, Tuyen Quang, Thai nguyen... nhung hang nam chiing ta van phai nhap nhieu nghin tan lithopon tir nuac ngoaị Trong cong trinh nay chiing toi trinh bay nhirng két qua nghien cuu trong phong thf nghiem \'e \-iec di^u che lithopon lir cac nguon quang kem \a baritin cua Viet nam.
PHAN THUC NCiHIEM
Quang baritin dugc dimg la quang Ha bac. sau khi dugc luyen chon da duac Iam
giau sa bo bAng each say a nhiet do khoang 200"C cho baritin xa \'un rạ sau do chi lay
nhfrng hat nhọ loai bo cat \a mot so tap chat khac. De dieu che dung dich ZnSO, chung toi sir dung iiiiang kem da dirac nung ọxi hcia thanh ZnO cua Tuven Quang. BaS tao thanh lrong san pham dtróc hoii tan trong axil cloh>dric IN roi duoc xac dmh bang
phU(yng phap chuan do phuc chat de qui ra luang BaSÔ da phan hu}. Tu dọ tfnh hieu
suai phan huy quang theo cong thuc: