Hdi nghi khoa hoc kT thuat md qudc ti 2010 Cong nghiep md tien tiin vi su phat trien bin viing CONG NGHE TUYEN QUANG BAUXIT DIASPOR V U N G M O H A Q U A N G , C A O B A N G ThS Nguyen Thi Hong Gam K[.]
Hdi nghi Cong nghiep khoa hoc md tien kT thuat tiin md qudc vi su phat ti trien - 2010 bin viing CONG NGHE TUYEN QUANG BAUXIT DIASPOR V U N G M O H A QUANG, C A O B A N G ThS Nguyen Thi Hong Gam K S Dao Cong V u V i e n K h o a hoc v a C o n g nghe M o - L u y e n k i m Tdm tat: Bao cao gidi thieu tdng quan vi cdng tac nghiin ciru thi nghiim tuyin quang bauxit gipxit va bauxit diaspor ciia Viet Nam Trin co sd nhung kit qua dd nghiin ciru va di xudt cdng nghi thich hop di tuyin quang bauxit diaspor vung md Ha Quang, Cao Bang bang viec kit hop thiit bi sang quay danh toi va may rira canh vuong Dat van de V i e t N a m l a m o t t r o n g n h i r n g quoc gia co n g u o n tai n g u y e n quang b a u x i t I o n tren the g i o i X e t ve n g u o n goc tao, quang b a u x i t V i e t N a m thuoc l o a i c h i n h la t r a m t i c h v a phong hoa laterit tir da bazan Cac m o b a u x i t p h o n g hoa laterit tir da bazan tap t r u n g c h i i y l u d M i l n N a m ( k h u v u c Tay N g u y e n ) , co phan k h o a n g vat c h i n h la g i p x i t v a c h i e m u u the tuyet d o i ve quy mo t r u l u o n g T r u l u o n g da d u o c t h a m danh gia la 5,432 t y t a n ( t u o n g u n g k h o a n g 2,3 ty tan quang t i n h co chat l u o n g san xuat a l u m i n theo p h u o n g phap B a y e r ) t r o n g cap A + B + C l la 817 t r i e u tan, cap C la 3612 t r i e u t i n v a c i p P I l a 1003 t r i e u t i n Quang bauxit n g u y e n k h a i v u n g co h a m l u o n g AI2O3 = 35-40%; S i = 5-10%; F e 2 = 25- 29%; T i = - % Quang t i n h t u y l n rira, h a m l u o n g dat A = - % ; S i = 1,65 , % ; F e = 17,1-22,3% ^ r r *\ r > Cac m o b a u x i t t r a m t i c h phan bo c h i i y e u d M i e n Bac, co phan k h o a n g vat c h i i yeu la diaspor Cac n h o m m o co gia t r i c o n g nghiep thuoc cac v u n g Cao B a n g , L a n g Son, 2 3 H a Giang T o n g t r u l u o n g (quang co hat + m m ) xap x i 91 t r i e u tan, t r o n g t r u l u o n g c i p A + B + C l l a 30,21 t r i e u t i n , c i p C2 la 53,65 t r i e u tan, C i p P I l a 7,09 t r i e u t i n Quang t i n h bauxit hat > m m co h a m l u o n g A = 44,65-58,84%; F e = 21,32-27,35%; t r T i = 2-4,5% T o n g trir l u o n g u d c t i n h k h o a n g v a i t r a m t r i e u tan N h o m m o b a u x i t H a Quang [ ] thuoc dai p h i a D o n g b l b a u x i t Cao B a n g , d ve p h i a 3 Bac t h i x a Cao B a n g , p h a n l d n thuoc h u y e n H a Quang v a m o t phan thuoc h u y e n H o a A n va T r a LTnh, co d i e n t i c h 600 k m H i e n nay, d day da biet d u o c cac m o : Soc G i a n g , L u n g K u o n g , T o n g Cang, D a i T o n g , M a L i p , B a n C h a - N a G i a n g , C h a n Che, L u n g N o i , K i n h T o , N a T u n g T i r n a m 1959-1962 D o a n D i a chat 19 da phat h i e n v a t i e n hanh t h a m cac m o : Soc G i a n g , T o n g Cang, B a n Che - N a G i a n g , C h a m Che v a t a i n g u y e n d u bao v u n g H a Quang l a 30-35 t r i e u t i n C o n g tac t u y e n quang b a u x i t c h i i y e u l a n h a m nang cao h a m l u o n g A v a c h i so m o d u n s i l i c ( M s i = A , % / S i , % ) t r o n g quang t i n h , dap u n g y e u cau chat l u o n g n g u y e n l i e u san xuat a l u m i n theo p h u o n g phap Bayer D e dap u n g y e u cau nay, t r o n g n h i e u t r u o n g hop, p h u o n g phap t u y e n d o n g i a n v a h i e u qua t h u o n g d u g c ap d u n g l a t u y e n r u a tach bo cac c i p hat m i n c h i i a set C o t h i t u y l n n l i t h u h l i cac k h o a n g v a t co i c h bang thuoc tap 693 Hoi Cong nghi khoa nghiep hoc md tien ki thuat tiin md quoc vi su phat te - triin bin 2010 vung hop axit beo Tach cac khoang vat chua sat va titan bang tuyln tir, tuyln nli, tuyln luc v v M o t so c o n g t r i n h n g h i e n c u u t u y e n q u a n g b a u x i t d a t h u c h i e n 6" V i e n K h o a hoc v a C o n g n g h e M o - L u y e n k i m 2.1 Ddi twang quang bauxit gipxit D o i v o i n h o m m o b a u x i t a v u n g T a y N g u y e n da co n h i e u de t a i , c o n g t r i n h nghien c u u t r u o c day v e t i n h t u y e n v a l u y e n cua chung V i e n M o L u y e n k i m (nay la V i e n K H & C N M o - L u y e n k i m ) da t i e n hanh m o t s i de t a i n g h i e n c u u t u y e n v o i cac m a u quang thuoc cac v u n g B a o L o c , V a n H o a , M a n g D e n , K o n g H a N i r n g , Q u a n g Son v.v K e t qua nghien c u u cho thay dac d i e m phan khoang vat cac m a u b a u x i t k h a g i o n g nhau, phan k h o a n g v a t c h u y e u l a g i p x i t , k h o a n g vat d i k e m co k a o l i n i t , g o t i t , hematit v v Quang cap hat I o n co chat l u o n g tot, M s , cao; k a o l i n i t , g o t i t tap t r u n g c h u y l u o c i p hat m i n D o l a c o so de t u y e n rira t h u h o i quang t i n h sach co h a m l u o n g AI2O3 > 48 % , Msi > 10 tir quang dau h a m l u o n g AI2O3 35 - % N a m 0 , V i e n K H & C N M o - L u y e n k i m da t h u c h i e n d l t a i n g h i e n c u u t u y l n quang b a u x i t T a n R a i , L a m D o n g de phuc v u cho viec lap B a o cao K h a t h i Quang nguyen khai co h a m l u o n g A = 39,15%, S i = 6,25% duoc t u y e n rira t r e n he t h o n g thiet b i ban cong nghiep g o m sang quay danh t o i , phan cap x o a n v a sang r u n g l a y quang t i n h co ham luong A > % va M s i >18 [4] N a m 2006, V i e n K H C N M o - L u y e n k i m da t i e n hanh n g h i e n c u u t u y e n bauxit v u n g \ > t N h a n C o , n h a m phuc v u c o n g tac lap D u an D a u t u x a y d u n g c o n g t r i n h nha m a y t u y e n va san xuat a l u m i n c o n g suat 300.000 tan a l u m i n / n a m K e t qua n g h i e n c u u cho thay bang p h u o n g phap danh t o i t r o n g m a y rira tang quay ket h o p k h i r b u n bang phan cap xoan va phan cap tren sang rira da t h u d u o c quang t i n h b a u x i t h a m l u o n g AI2O3 , % ; S1O2 2,27 %, M S i 22,0 v o i m u c t h u hoach 54,96 % , tir quang dan A , % , M S i 7,10 [ ] K e t qua n g h i e n c u u t u y e n quang b a u x i t G i a NghTa - D a c N o n g bang p h u o n g phap tuyen rira da t h u h o i d u g c quang t i n h co h a m l u o n g AI2O3 50,51 % , M s i 16,57 m u c thu hoach dat 51,13 % , tir quang n g u y e n k h a i co phan: A = 40,32 % ; S i = 8,56%, M s i 4,71 [ ] 2.2 Doi twang quang bauxit diaspor Cac cong trinh nghien cuu truoc day a Viet Nam deu khang dinh so tuyen rira bang thiet b i sang quay d a n h t o i ket h g p v o i phan cap cho ket qua k h a tot T u y n h i e n day la cac n g h i e n c u u cho d o i t u g n g quang b a u x i t g i p x i t k h u v u c T a y N g u y e n , co t i n h c h i t khac v o i d o i t u g n g quang b a u x i t diaspor k h u v u c m i e n Bac V i e n K H & C N M o - L u y e n k i m da n g h i e n c u u t u y e n b a u x i t diaspor L a n g Son tir quang dau co h a m l u g n g A 45,16%) v a M s i , B a n g p h u o n g phap t u y e n rira, da t h u d u g c quang t i n h b a u x i t co ham lugng A 53,17% va M S i 9,58 [ ] V i e n K H & C N M o - L u y e n k i m c u n g da n g h i e n c u u cong nghe t u y e n phuc v u c o n g tac lap d u an dau t u k h a i thac v a t u y l n b a u x i t m o T a p N a , Cao B a n g K e t qua n g h i e n c u u cho thay, m a u quang dau co h a m l u g n g A , % va M s i 3,27 bang p h u o n g phap t u y e n rira tren thiet b i sang quay danh t o i t h u h l i quang t i n h 694 r r khoa hoc ki thuat md quoc te - 2010 md tien tien vi su phat trien ben viing Hoi nghi Cong nghiep cap hat + m m co h a m l u o n g AI2O3 , % v a M s i 7,7 [ ] C h i p h i n u o c cho k h a u rira la trung b i n h m / t a n d o i v d i quang b a u x i t diaspor 3 Dinh huong nghien cuu tuyen quang bauxit diaspor vdi thiet bi may rira canh vuong V i e n K h o a hoc v a C o n g nghe M o - L u y e n k i m da t i e n hanh n h i e u dd t a i nghien c u u tuyen rira quang b a u x i t g i p x i t v a b a u x i t diaspor tren he t h d n g t h i l t b i sang quay danh t o i , phan cap xoah, sang r u n g D o v a y de tai da k h o n g n g h i e n c u u sau v l viec xac d i n h t h o n g so t o i u u tren he t h d n g thiet b i m a se k l thira m o t sd k i t qua n g h i e n c u u t r u d c day D o quang b a u x i t diaspor rat c u n g v a dai nen k h o n g so b i v d v u n k h i d u n g t h i l t b i m a y rira canh v u o n g nen de t a i da d i sau vao n g h i e n c u u t u y e n rira v d i thiet b i T i r cac k i t qua thuc n g h i e m se t h i n g h i e m so d l cong nghe v d i t h i l t b i d u o c lira chon la p h i i h o p nhat M a y rira canh v u o n g ( H i n h 1) t h u o n g d u n g de x i r l y quang co k i c h thudc hat n h d h o n 75mm Thiet b i cd u u d i e m la nang suat l d n va c h i e m i t d i e n tich x u d n g va t i e u hao n u d e i t h o n thiet b i sang quay N h u o c d i e m * ciia thiet b i l a c d quang dua vao rua k h o n g l d n v a san p h a m rira k h o n g d u o c phan cap, neu Hinh Thiet bi may rua canh vuong quang g i d n , de v d t h i se tao n h i l u m u n k h i rira [ ] N g h i e n c u u t h i n g h i e m so dd t u y e n M a u t i l n hanh t h i n g h i e m cd h a m l u o n g A = , % ; S i = 11,28%; m o d u n silic ( M s i ) = , M a u n g h i e n c u u l a l o a i l o a i b a u x i t t r a i n t i c h , cd phan khoang vat chii y l u l a diaspor Q u a n g cap hat l d n cd c h i t l u o n g k h a t i t ; k a o l i n i t , c l o r i t tap t r u n g c h u yeu d c i p hat m i n D d l a c o sd de lira c h o n p h u o n g phap t u y l n rua, tach c i p hat - m m d l thu h o i quang t i n h sach c d chat l u o n g dap u n g y e u c i u l u y e n k i m D o t i n h c h i t quang c i p hat l d n cd c i u tao dac sit v a k h a sach, quang c i p hat nhd nhieu set v a k h d r u a n e n da phan l a m l o a i m a u d l n g h i e n c u u : m a n + m m v a m a u m m Cac n g h i e n c u u thuc n g h i e m se tap t r u n g vao m a n - m m d l xac d i n h t h o n g s i v a so d l t u y l n rira; m a u + m m se d u o c t u y l n rira tach c i p - , m m m l u c h i cd b u n set bam vao cue quang De tai da tien hanh nghien cuu thuc nghiem tren he thong sang quay danh toi, he thong m a y rira canh v u o n g , sang phan c i p n h a m xac d i n h cac t h o n g s i ve c h i p h i n u d e rua, toe quay cua true v a nang suat c i p quang 695 Hoi Cong nghi khoa nghiep hoc md tien ki thuat tiin md quoc vi su phat triin te bin zuiU viing T u y e n q u a n g b a u x i t d i a s p o r H a Q u a n g , C a o B n g t r e n he t h o n g s a n g q u a y danh t o i Theo cac k e t qua da n g h i e n c u u r u a b a u x i t t r u o c day b a n g sang quay danh t o i t h i n g h i e m c h i l a m t h i n g h i e m k i e m c h u n g Cac t h o n g so ve c h i p h i n u o c c h o n de t h i n g h i e m la: k h a u sang d a n h t o i m / t , t y le L / R k h a u danh t o i 1/1, k h a u p h a n cap x o i n m / t , k h a u sang r u n g 0.5 m / t ( c h i p h i t i n h theo quang dau), ap l u c n u o c r u a l a t Sau k h i t i e n h a n h t h i n g h i e m r u a l a n d o i v o i m a u - m m t r e n he t h o n g sang quay danh t o i , san p h a m t r e n sang quay c o n l a n n h i e u cue set da b i v o v i e n T i e p tuc r u a lan t h i thay san p h a m quang t i n h co h a m l u o n g AI2O3 , 8 % v a t h u h o a c h quang t i n h la 63,15%), M s i = 5,97 T i e n h a n h r u a l a n v o i m a u + m m t h i c h i can r u a l a n da t h u duoc san p h a m co h a m l u o n g AI2O3 tang len , % v a M s i = , K e t qua t h i n g h i e m the hien B a n g Bang Bang tdng hop san pham Thu hoach,% San p h a m tuyen rua tren he thong SQBT H a m Iirong, % Thuc thu, % AI2O3 Si0 AI2O3 Si0 Msi Quang tinh +50mm 34,17 51,83 3,84 37,31 11,63 13,50 Quang tinh +3-5 0mm 39,10 50,88 8,52 41,91 29,53 5,97 Quang tinh tdng 73.27 51,32 6,34 79,22 41,16 8,09 Thai 26,73 36,90 24,44 20,78 58,84 1,63 Cong 100,00 47,47 11,28 100,00 100,00 4,21 hop r r r N h a n x e t c h u n g : V o i he t h o n g thiet b i sang quay d a n h t o i , co the thay qu&ng t i n h t h u d u o c sau k h i t u y e n r u a co chat l u o n g dat y e u cau m u c t i e u de t a i da dat Can c u vao ket qua t u y e n r u a l a n m a u - m m v a t u y e n l a n m a u + m m , co the d i n h h u o n g duoc so cong nghe: Q u a n g dau d u o c sang p h a n l o a i san p h a m + m m v a - m m Quang + d u o c d u a vao sang quay danh t o i de r u a l a n de t a c h b u n set l a y quang t i n h +5 m m v a quang - m m rira l a n bang sang quay danh t o i v a qua sang p h a n cap de tach cap - m m , lay quang t i n h - + m m T o n g h o p san p h a m d B a n g cho thay quang tinh tong h o p co h a m l u o n g AI2O3 la 51,32%) v a M s i = 8,09 dat m u c t i e u d l t a i da d l T u y nhien t i e u hao n u o c rira cho k h a u sang quay danh t o i l a , m It So t h i n g h i e m rira lan tren he t h o n g sang quay danh t a i v a phan cap the h i ? n d H i n h 4.2 T u y e n q u a n g b a u x i t d i a s p o r H a Q u a n g , C a o B a n g t r e n he t h o n g m a y r u a canh v u o n g B l tai t i l n h a n h t h i n g h i e m d l i v a i loai m a u - m m v a + m m t u o n g t u n h u d o i v d i t h i n g h i e m t r e n he t h o n g sang quay danh t o i T i e n h a n h n g h i e n c u u t h u c n g h i e m nham xac d i n h cac t h o n g so t o i u u n h u xac d i n h nang suat cap l i e u , c h i p h i n u d e r u a v a toe quay cua true K e t qua t h u c n g h i e m cho thay thiet b i m a y rira canh v u o n g rat p h i i h o p de rua quang b a u x i t diaspor M a u - m m c h i can rira m o t l a n da rat sach, san p h a m quang t i n h da dat h a m l u o n g AI2O3 50,72%) K e t qua tren c u n g cho t h i y m a y rira canh v u o n g 696 noi nghi Cong nghiep Khoa hoc md tien kT thuat tiin md quoc vi sir phat te - triin bin 2010 vung khong lam vd vun san phim va mk vao duoi thai Quang tinh tdng hop co ham luong A1 , % v a m u c t h u hoach dat 73,29%, M s i = , K i t qua t h i n g h i e m t h i h i e n d B a n g v a cac c h i t i e u k i n h t l k y thuat k h i dung m a y r u a canh v u o n g neu d B a n g 4.3 So* d o c o n g n g h e h o p l y t u y e n q u a n g b a u x i t d i a s p o r v u n g m o H a Quang, Cao B a n g T r e n c o sd k i t qua n g h i e n c u u m a u quang b a u x i t diaspor v u n g M o H a Quang, Cao Bang, viec sang tach quang n g u y e n k h a i cap +5 Omm v a - m m t u y e n r i e n g cho ket qua tot Quang cap hat tho co dang dac sit nen k h o n g can thiet p h a i dap de t u y e n rua Mau thi nghidm Nu&c -50mm C a p lieu NwOc Sang quay danh toi 10 mm + 10 mm Nw&C PhaP cap xoSn -0,25mm +0,25mm Sang quay danh tai Nw&c -10 mr +10 mm Phan cap xoSn +0,25mm -0,25mm Sang rung a=3mm -3 mm +3 mm v Ou3ne tinh V Hinh Sa thi nghiem 697 rua lan Hdi Cdng nghi nghiep khoa hoc md tien ki thuat tiin md qudc vi su phat te - triin 2010 bin Bang Kit qua tuyen rua bang hf thong thiet bi May rua canh Thu hoach, % San pham Quang tinh 34.07 Quang tinh 39.22 Quang tinh tong hop Quang thai Quang dau vuong H a m lirong, % A1 Si0 52,00 50,72 Thirc thu, % A1 2 37.32 11,51 13.65 8,49 41,91 29,52 5,97 51,32 6,17 79.23 41.03 8,31 26.71 36,92 24,90 20,77 58,97 1,48 100,00 47,47 11,28 100,00 100,00 4,21 Ham luong M Gia t r i % 47,4 G h i chu 4,21 Ham luong A M dau Don v i S i K h o i luong Tieu hao nang luong 73,29 Cac c h i tieu c h i n h Quang tinh Si0 3,81 Bang Mot so chi tieu kinh ii ky thuat chu yeu cho tan quang Quang dau viing T 1,00 % 51,51 8,48 s i Khoi luong T 0,72 Tieu hao dien kWh 0,47 Tieu hao nuoc m 3 r \ * Cap hat +5 m m r u a bang sang quay danh t o i v a m a y r u a canh v u o n g co cac c h i tieu cong nghe t u o n g d u o n g D o i v o i cap hat + m m k i l n n g h i c h o n sang quay danh t o i v i thiet b i co the nhan d u o c cap hat I o n h o n n h i e u so v o i m a y r u a canh v u o n g k h i cung nang suat v a de dang t a c h n h u n g cap hat d i n h l a n (dac biet k h i quang n g u y e n k h a i co am cao) * Cap hat - m m r u a bang m a y r u a canh v u o n g co cac c h i t i e u c o n g nghe tot dac biet la c h i p h i n u o c g i a m dang ke so v o i sang quay danh t o i K i e n n g h i d u n g m a y r u a canh v u o n g cho k h a u t u y e n K h u y e n n g h i d u n g ket h o p sang quay danh t o i v a m a y r u a canh v u o n g cho d o i t u o n g quang b a u x i t diaspor se dat d u g c chat l u g n g quang t i n h cao v a h i e u qua k i n h te So t u y e n ( H i n h 3) d o n gian, t i e u hao n u o c m /tan quang dau v a san p h a m quang t i n h rat sach, dat chat l u o n g y e u cau D o v a y dh t a i dh xuit so t u y e n r u a bSng t h i e t b i m a y r u a c a n h v u o n g k e t h o p v o l s a n g q u a y d a n h t o i v a s a n g p h a n cap n h u sau: Quang dau d u g c sang phan l o a i cap hat + m m v a - m m Cap hat - m m dugc dua vao t u y e n r u a t r e n thiet b i m a y r u a canh v u o n g t a c h b u n set cap - , m m San 698 Hoi Cong nghf khoa nghiep md hoc ki thuat tien tiin md qudc vi sic phat te - triin 2010 bin viing pham ciia may rua canh vuong dugc phan cip tren sang rung tach cip -3mm dua di thai C i p + m m d u g c t u y l n r u a tren sang quay danh tod K i t qua g h i a B a n g QuSng nguyen khai Sang a=50mm -50mm +50mm M&y nia canh vudng -0,5mm +0,5mm Sing quay danh tai Sang a=3 mm -50mm +50 mm -3 mm +3 mm QuSng tinh Hinh Thai Set dd cong ngh$ tuyen viing md Hd Quang, Bang Kit qua tuyin San p h a m quang bauxit Cao Bang rira bang h$ thong thiet bi may riea canh T h u hoach, % H a m luong, A1 % Si0 diaspor vuong Thuc thu, % AI2O3 Si0 M S i Quang t i n h 73,29 51,32 6,17 79.23 41.03 8,31 Quang thai 26.71 36,92 24,90 20,77 58,97 1,48 QuSng dau 100,00 47,47 11,28 100,00 100,00 4,21 N h a n xet: So d l t u y e n rua d o n gian v a t i e u hao nang l u g n g t h i p , k i t qua dat d u g c kha cao: QuSng t i n h t i n g h g p co h a m l u g n g AI2O3 , % v a m u c t h u hoach dat 73,29%), M s i = 8,31 San p h a m quSng t i n h t h u d u g c dap u n g yeu c i u c h i t l u o n g l u y e n k i m K e t l u a n va k i e n n g h i Sau k h i n g h i e n c u u m a u qu&ng b a u x i t diaspor v u n g M o H a Q u a n g , Cao B a n g co t h i ket luan n h u n g v a n de c h i n h n h u sau: - K e t qua n g h i e n c u u dat d u g c m u c t i e u de tai da d l ra: San p h i m quang t i n h b a u x i t co ham l u g n g AI2O3 > % v a M s i > dap u n g d u g c y e u cau c h i t l u g n g l u y e n k i m 699 Hoi Cong nghi nghiep khoa hoc md tien kT thuat tien mo quoc vi su phat te - ZU1U triin bin viing - K h a n g d i n h d u g c t h i e t b i m a y rira canh v u o n g p h u h g p cho d o i t u g n g quang b a u x i t diaspor, t i e u hao nang l u g n g i t h o n so v o i thiet b i sang quay danh t o i C i p - + , m m c h i e m gan 10% dang d u g c t h a i bo, d l t h u h l i c i p co the d u n g cac p h u o n g phap khac n h u t u y e n tir hoac t u y e n n o i Theo k e t qua p h a n t i c h k h o a n g t h i sat n a m t r o n g quang a dang hematit v a l i m o n i t nen t u y e n tir k h o n g m a n g l a i ket qua cao va cung k h o n g l a m tang M s i T h e m vao k h o a n g vat chua n h o m x a m n h i e m rat m i n , do de t h u h o i can p h a i n g h i e n rat m i n v a t u y e n n o i t h i t i n h h i e u qua k i n h te rat thap D o do, k h u o n k h o de tai da k h o n g d i sau vao n g h i e n c u u t h u h o i cap hat T u y nhien, de tiet k i e m tai n g u y e n t h i can co n g h i e n c u u t h e m ve v a n de vao t h o i d i e m t h i c h hop./ Tdi lieu tham khdo Phan X u a n U y , T o n g Cue dia chat Bao cao dia chat nhom md bauxit Ha Quang - Cao Bang Ket qua tim kiem - tham dd 1984 T r u o n g Cao Suyen - N g u y e n T h i Q u y n h A n h Giao trinh thiet ke xudng tuyen va an toan H a N o i 2000 ~~ t ^ K S N g u y e n C a n h N h a Nghien ciru tuyen bauxit Md Tap Nd, Cao Bang V M L K 2008 K S N g u y e n C a n h N h a Bao cao Nghien cuu tuyen bauxit Ma Meo-Lqng Son khoang V M L K 2008 r r > D i n h B a N a u Bao cao tdng kit di tai "Nghien ciru cdng nghi tuyin quang bauxit khu Tay md Tan Rai - Lam Ddng" V M L K 1-2002 >v N g u y e n C a n h N h a Nghiin cuu so bo khd nang tuyin rira cdc loai quang bauxit md "1/5 " Ddc Nong V M L K 1987 K S N g u y e n T h i D o a n H a n h Xir ly quang bauxit va bun bang cdng nghi vi sinh T u y e n tap bao cao.7-2009 N g u y e n C a n h N h a Nghien ciru khd tuyin Co- Ddc Nong V M L K 2006 bauxit Nhan N g u y e n C a n h N h a Mot sd kit qua nghiin va lira chon ciru cdng nghi cdng tuyen nghi quang tuyin bauxit quang Gia NghTa Tap c h i C o n g nghiep M o N ° - 0 10 W i l l s , B A M i n e r a l processing technology 1988 Jan iv x r 11 T h S N g u y e n T h i H o n g G a m Bao cao nghien ciru cdng nghi bauxit diaspor viing md Ha Quang, Cao Bang 700 H a N o i 2009 t hop ly tuyen quang ... i t d i a s p o r v u n g m o H a Quang, Cao B a n g T r e n c o sd k i t qua n g h i e n c u u m a u quang b a u x i t diaspor v u n g M o H a Quang, Cao Bang, viec sang tach quang n g u y e... khdo Phan X u a n U y , T o n g Cue dia chat Bao cao dia chat nhom md bauxit Ha Quang - Cao Bang Ket qua tim kiem - tham dd 1984 T r u o n g Cao Suyen - N g u y e n T h i Q u y n h A n h Giao... tuyen bauxit Md Tap Nd, Cao Bang V M L K 2008 K S N g u y e n C a n h N h a Bao cao Nghien cuu tuyen bauxit Ma Meo-Lqng Son khoang V M L K 2008 r r > D i n h B a N a u Bao cao tdng kit di tai