{"id":4156,"date":"2025-07-09T14:10:00","date_gmt":"2025-07-09T06:10:00","guid":{"rendered":"https:\/\/www.superfinemill.com\/?p=4156"},"modified":"2025-07-09T14:10:03","modified_gmt":"2025-07-09T06:10:03","slug":"comprehensive-analysis-of-silicon-powder-production-process-and-equipment","status":"publish","type":"post","link":"https:\/\/www.superfinemill.com\/vi\/comprehensive-analysis-of-silicon-powder-production-process-and-equipment\/","title":{"rendered":"Ph\u00e2n t\u00edch to\u00e0n di\u1ec7n v\u1ec1 quy tr\u00ecnh v\u00e0 thi\u1ebft b\u1ecb s\u1ea3n xu\u1ea5t b\u1ed9t Silicon"},"content":{"rendered":"

B\u1ed9t silicon \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb th\u1ea1ch anh tinh th\u1ec3, th\u1ea1ch anh n\u00f3ng ch\u1ea3y, v.v. v\u00e0 \u0111\u01b0\u1ee3c x\u1eed l\u00fd th\u00f4ng qua nghi\u1ec1n<\/a>, ph\u00e2n lo\u1ea1i ch\u00ednh x\u00e1c, lo\u1ea1i b\u1ecf t\u1ea1p ch\u1ea5t v\u00e0 c\u00e1c quy tr\u00ecnh kh\u00e1c. Theo h\u00ecnh th\u00e1i h\u1ea1t, c\u00f3 th\u1ec3 chia th\u00e0nh b\u1ed9t silica g\u00f3c v\u00e0 b\u1ed9t silica h\u00ecnh c\u1ea7u.<\/p>\n\n\n\n

Quy tr\u00ecnh v\u00e0 thi\u1ebft b\u1ecb s\u1ea3n xu\u1ea5t b\u1ed9t silicon g\u00f3c<\/h2>\n\n\n\n
\"Angular<\/figure>\n\n\n\n

B\u1ed9t silic g\u00f3c c\u1ea1nh c\u00f3 h\u00ecnh d\u1ea1ng kh\u00f4ng \u0111\u1ec1u v\u00e0 ch\u1ee7 y\u1ebfu l\u00e0 g\u00f3c c\u1ea1nh. Nguy\u00ean li\u1ec7u s\u1ea3n xu\u1ea5t ch\u1ee7 y\u1ebfu l\u00e0 th\u1ea1ch anh m\u1ea1ch, th\u1ea1ch anh v\u00e0 th\u1ea1ch anh n\u00f3ng ch\u1ea3y. C\u00f3 th\u1ec3 chia th\u00e0nh b\u1ed9t silic tinh th\u1ec3 v\u00e0 b\u1ed9t silic n\u00f3ng ch\u1ea3y.<\/p>\n\n\n\n

Thi\u1ebft b\u1ecb s\u1ea3n xu\u1ea5t ch\u00ednh c\u1ee7a b\u1ed9t silicon g\u00f3c bao g\u1ed3m m\u00e1y nghi\u1ec1n bi<\/a>, ph\u00e2n lo\u1ea1i<\/a>, m\u00e1y tr\u1ed9n v\u00e0 m\u00e1y ph\u1ee7<\/a>, v.v. Quy tr\u00ecnh s\u1ea3n xu\u1ea5t bao g\u1ed3m nghi\u1ec1n kh\u00f4 v\u00e0 nghi\u1ec1n \u01b0\u1edbt.<\/p>\n\n\n\n

C\u00f4ng ngh\u1ec7 v\u00e0 thi\u1ebft b\u1ecb s\u1ea3n xu\u1ea5t quy tr\u00ecnh kh\u00f4<\/h3>\n\n\n\n
\"Dry<\/figure>\n\n\n\n
S\u1ed1 seri<\/td>Qu\u00e1 tr\u00ecnh<\/td>N\u1ed9i dung quy tr\u00ecnh<\/td>Thi\u1ebft b\u1ecb ch\u00ednh<\/td><\/tr>
1<\/td>Th\u00e0nh ph\u1ea7n<\/td>Th\u00eam c\u00e1c v\u1eadt li\u1ec7u nh\u01b0 c\u00e1t th\u1ea1ch anh, c\u00e1t th\u1ea1ch anh nung ch\u1ea3y, v.v. theo c\u00f4ng th\u1ee9c.<\/td>\u2014\u2014<\/td><\/tr>
2<\/td>Lo\u1ea1i b\u1ecf t\u1ea1p ch\u1ea5t<\/td>Th\u00f4ng qua thi\u1ebft b\u1ecb lo\u1ea1i b\u1ecf s\u1eaft \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf ri\u00eang, t\u1eeb t\u00ednh m\u1ea1nh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 lo\u1ea1i b\u1ecf t\u1ea1p ch\u1ea5t kim lo\u1ea1i b\u1ecb t\u1eeb t\u00ednh h\u1ea5p d\u1eabn trong nguy\u00ean li\u1ec7u th\u00f4 \u0111\u1ec3 thu \u0111\u01b0\u1ee3c nguy\u00ean li\u1ec7u th\u00f4 c\u00f3 \u0111\u1ed9 tinh khi\u1ebft cao h\u01a1n.<\/td>Ch\u1ea5t t\u1ea9y s\u1eaft<\/td><\/tr>
3<\/td>Nghi\u1ec1n kh\u00f4<\/td>S\u1eed d\u1ee5ng kh\u00f4ng kh\u00ed l\u00e0m m\u00f4i tr\u01b0\u1eddng ph\u00e2n t\u00e1n, x\u00e1c \u0111\u1ecbnh t\u1ef7 l\u1ec7 v\u00e0 s\u1ed1 l\u01b0\u1ee3ng c\u1ee5 th\u1ec3 c\u1ee7a v\u1eadt li\u1ec7u nghi\u1ec1n nh\u01b0 bi nghi\u1ec1n alumina cho m\u00e1y nghi\u1ec1n v\u00e0 li\u00ean t\u1ee5c ho\u1eb7c ng\u1eaft qu\u00e3ng th\u00eam v\u1eadt li\u1ec7u \u0111\u1ec3 nghi\u1ec1n v\u1eadt li\u1ec7u th\u00e0nh b\u1ed9t m\u1ecbn.<\/td>M\u00e1y nghi\u1ec1n bi<\/td><\/tr>
4<\/td>Ph\u00e2n lo\u1ea1i \u0111\u1ed9 ch\u00ednh x\u00e1c<\/td>S\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 ph\u00e2n lo\u1ea1i lu\u1ed3ng kh\u00ed \u0111\u1ec3 ki\u1ec3m so\u00e1t s\u1ef1 ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t c\u1ee7a s\u1ea3n ph\u1ea9m nh\u1eb1m \u0111\u00e1p \u1ee9ng c\u00e1c nhu c\u1ea7u c\u1ee5 th\u1ec3.<\/td>Ph\u00e2n lo\u1ea1i<\/td><\/tr>
5<\/td>Tr\u1ed9n v\u00e0 pha tr\u1ed9n<\/td>Tr\u1ed9n c\u00e1c s\u1ea3n ph\u1ea9m c\u00f3 k\u00edch th\u01b0\u1edbc h\u1ea1t kh\u00e1c nhau \u0111\u1ec3 thu \u0111\u01b0\u1ee3c s\u1ea3n ph\u1ea9m c\u00f3 ph\u00e2n b\u1ed1 k\u00edch th\u01b0\u1edbc h\u1ea1t c\u1ee5 th\u1ec3.<\/td>M\u00e1y tr\u1ed9n<\/td><\/tr>
6<\/td>S\u1eeda \u0111\u1ed5i b\u1ec1 m\u1eb7t<\/td>Ch\u1ecdn m\u1ed9t ch\u1ea5t \u0111i\u1ec1u ch\u1ec9nh b\u1ec1 m\u1eb7t c\u1ee5 th\u1ec3 v\u00e0 b\u1eb1ng c\u00e1ch ki\u1ec3m so\u00e1t l\u01b0\u1ee3ng ch\u1ea5t \u0111i\u1ec1u ch\u1ec9nh b\u1ec1 m\u1eb7t, nhi\u1ec7t \u0111\u1ed9 \u0111i\u1ec1u ch\u1ec9nh, th\u1eddi gian b\u1ed5 sung, th\u1eddi gian x\u1eed l\u00fd v\u00e0 c\u00e1c th\u00f4ng s\u1ed1 kh\u00e1c, b\u1ec1 m\u1eb7t c\u1ee7a c\u00e1c h\u1ea1t s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c ph\u1ee7 m\u1ed9t l\u01b0\u1ee3ng ch\u1ea5t \u0111i\u1ec1u ch\u1ec9nh b\u1ec1 m\u1eb7t nh\u1ea5t \u0111\u1ecbnh.<\/td>Ng\u01b0\u1eddi s\u1eeda \u0111\u1ed5i<\/td><\/tr>
7<\/td>Bao b\u00ec s\u1ea3n ph\u1ea9m<\/td>S\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c c\u00e2n trong t\u00fai v\u00e0 t\u00fai \u0111\u01b0\u1ee3c ni\u00eam phong<\/td>Thi\u1ebft b\u1ecb \u0111\u00f3ng g\u00f3i t\u1ef1 \u0111\u1ed9ng<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\"ball
m\u00e1y nghi\u1ec1n bi cho b\u1ed9t si\u00eau m\u1ecbn<\/figcaption><\/figure>\n\n\n\n

Nguy\u00ean li\u1ec7u b\u1ed9t vi silic \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o m\u00e1y nghi\u1ec1n bi ho\u1eb7c m\u00e1y nghi\u1ec1n rung<\/a> \u0111\u1ec3 nghi\u1ec1n. Qu\u00e1 tr\u00ecnh nghi\u1ec1n n\u00e0y c\u00f3 th\u1ec3 li\u00ean t\u1ee5c, v\u1edbi v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o v\u00e0 x\u1ea3 li\u00ean t\u1ee5c, ho\u1eb7c li\u00ean quan \u0111\u1ebfn vi\u1ec7c n\u1ea1p t\u1eebng m\u1ebb m\u1ed9t kh\u1ed1i l\u01b0\u1ee3ng nguy\u00ean li\u1ec7u th\u00f4 nh\u1ea5t \u0111\u1ecbnh, sau \u0111\u00f3 l\u00e0 qu\u00e1 tr\u00ecnh nghi\u1ec1n li\u00ean t\u1ee5c trong m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh. Trong qu\u00e1 tr\u00ecnh x\u1ea3, k\u00edch th\u01b0\u1edbc h\u1ea1t \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t b\u1edfi m\u1ed9t m\u00e1y ph\u00e2n lo\u1ea1i b\u1ed9t si\u00eau nh\u1ecf. C\u00e1c s\u1ea3n ph\u1ea9m th\u00f4 \u0111\u01b0\u1ee3c \u0111\u01b0a tr\u1edf l\u1ea1i m\u00e1y nghi\u1ec1n \u0111\u1ec3 nghi\u1ec1n l\u1ea1i ho\u1eb7c tr\u1edf th\u00e0nh s\u1ea3n ph\u1ea9m cu\u1ed1i c\u00f9ng, trong khi c\u00e1c s\u1ea3n ph\u1ea9m m\u1ecbn h\u01a1n l\u00e0 s\u1ea3n ph\u1ea9m. \u0110\u1ed1i v\u1edbi qu\u00e1 tr\u00ecnh nghi\u1ec1n kh\u00f4, h\u00e0m l\u01b0\u1ee3ng \u1ea9m c\u1ee7a v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o m\u00e1y nghi\u1ec1n ph\u1ea3i \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t ch\u1eb7t ch\u1ebd, v\u00ec s\u1ea3n ph\u1ea9m s\u1ebd kh\u00f4ng tr\u1ea3i qua qu\u00e1 tr\u00ecnh s\u1ea5y kh\u00f4 th\u00eam.<\/p>\n\n\n\n

c\u00f4ng ngh\u1ec7 v\u00e0 thi\u1ebft b\u1ecb s\u1ea3n xu\u1ea5t \u01b0\u1edbt<\/h3>\n\n\n\n
\"wet<\/figure>\n\n\n\n

M\u1ed9t kh\u1ed1i l\u01b0\u1ee3ng nh\u1ea5t \u0111\u1ecbnh c\u1ee7a nguy\u00ean li\u1ec7u b\u1ed9t silic th\u00f4 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o m\u00e1y nghi\u1ec1n bi. M\u1ed9t l\u01b0\u1ee3ng n\u01b0\u1edbc th\u00edch h\u1ee3p c\u0169ng \u0111\u01b0\u1ee3c th\u00eam v\u00e0o, v\u1edbi n\u1ed3ng \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng t\u1eeb 65% \u0111\u1ebfn 80%. Sau khi nghi\u1ec1n li\u00ean t\u1ee5c trong v\u00e0i gi\u1edd, b\u00f9n \u0111\u01b0\u1ee3c th\u1ea3i ra. Sau \u0111\u00f3, n\u00f3 \u0111\u01b0\u1ee3c t\u00e1ch n\u01b0\u1edbc b\u1eb1ng m\u00e1y \u00e9p l\u1ecdc ho\u1eb7c \u0111\u1ec3 l\u1eafng t\u1ef1 nhi\u00ean trong th\u00f9ng v\u1eadt li\u1ec7u, t\u1ea1o th\u00e0nh m\u1ed9t b\u00e1nh \u01b0\u1edbt. B\u00e1nh \u01b0\u1edbt \u0111\u01b0\u1ee3c nghi\u1ec1n n\u00e1t v\u00e0 ph\u00e2n t\u00e1n. Sau \u0111\u00f3, n\u00f3 \u0111\u01b0\u1ee3c \u0111\u01b0a \u0111\u1ec1u v\u00e0o m\u00e1y s\u1ea5y khu\u1ea5y tr\u1ee5c r\u1ed7ng. Sau khi s\u1ea5y kh\u00f4, s\u1ea3n ph\u1ea9m cu\u1ed1i c\u00f9ng thu \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n

Quy tr\u00ecnh v\u00e0 thi\u1ebft b\u1ecb s\u1ea3n xu\u1ea5t b\u1ed9t silicon h\u00ecnh c\u1ea7u<\/h2>\n\n\n\n
\"Spherical<\/figure>\n\n\n\n

B\u1ed9t silic h\u00ecnh c\u1ea7u l\u00e0 v\u1eadt li\u1ec7u d\u1ea1ng b\u1ed9t c\u00f3 c\u00e1c h\u1ea1t ri\u00eang l\u1ebb c\u00f3 h\u00ecnh c\u1ea7u. Th\u00e0nh ph\u1ea7n ch\u00ednh l\u00e0 silic v\u00f4 \u0111\u1ecbnh h\u00ecnh. Nguy\u00ean li\u1ec7u th\u00f4 \u0111\u1ec3 s\u1ea3n xu\u1ea5t ch\u1ee7 y\u1ebfu l\u00e0 b\u1ed9t silic g\u00f3c. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p s\u1ea3n xu\u1ea5t ch\u00ednh bao g\u1ed3m t\u1ed5ng h\u1ee3p ng\u1ecdn l\u1eeda, l\u00f2 nung plasma, t\u1ed5ng h\u1ee3p h\u00f3a h\u1ecdc v\u00e0 th\u1ee7y ph\u00e2n.<\/p>\n\n\n\n

So s\u00e1nh c\u00e1c ph\u01b0\u01a1ng ph\u00e1p s\u1ea3n xu\u1ea5t b\u1ed9t silicon h\u00ecnh c\u1ea7u kh\u00e1c nhau<\/strong><\/p>\n\n\n\n

Ph\u01b0\u01a1ng ph\u00e1p v\u1eadt l\u00fd<\/strong><\/td>Quy tr\u00ecnh lu\u1ed3ng<\/strong><\/td>\u0110\u1eb7c tr\u01b0ng<\/strong><\/td><\/tr>
Ph\u01b0\u01a1ng ph\u00e1p h\u00ecnh c\u1ea7u ng\u1ecdn l\u1eeda<\/td>\u0110\u01b0a b\u1ed9t silicon vi m\u00f4 v\u00e0o tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 cao do kh\u00ed oxy t\u1ea1o ra. L\u00e0m n\u00f3ng ch\u1ea3y \u1edf nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 l\u00e0m ngu\u1ed9i th\u00e0nh c\u00e1c vi\u00ean bi \u0111\u1ec3 t\u1ea1o th\u00e0nh b\u1ed9t silicon vi m\u00f4 h\u00ecnh c\u1ea7u c\u00f3 \u0111\u1ed9 tinh khi\u1ebft cao<\/td>D\u1ec5 d\u00e0ng \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t c\u00f4ng nghi\u1ec7p quy m\u00f4 l\u1edbn<\/td><\/tr>
Ph\u01b0\u01a1ng ph\u00e1p phun n\u00f3ng ch\u1ea3y \u1edf nhi\u1ec7t \u0111\u1ed9 cao<\/td>L\u00e0m tan ch\u1ea3y th\u1ea1ch anh c\u00f3 \u0111\u1ed9 tinh khi\u1ebft cao th\u00e0nh th\u1ea1ch anh l\u1ecfng \u1edf nhi\u1ec7t \u0111\u1ed9 2100-2500\u00b0C. Sau khi phun v\u00e0 l\u00e0m ngu\u1ed9i, thu \u0111\u01b0\u1ee3c b\u1ed9t silic h\u00ecnh c\u1ea7u<\/td>T\u1ed1c \u0111\u1ed9 h\u00ecnh c\u1ea7u v\u00e0 t\u1ed1c \u0111\u1ed9 v\u00f4 \u0111\u1ecbnh h\u00ecnh \u0111\u1ec1u g\u1ea7n b\u1eb1ng 100%
Nh\u01b0ng n\u00f3 r\u1ea5t kh\u00f3<\/td><\/tr>
Ph\u01b0\u01a1ng ph\u00e1p plasma<\/td>S\u1eed d\u1ee5ng v\u00f9ng nhi\u1ec7t \u0111\u1ed9 cao c\u1ee7a plasma \u0111\u1ec3 l\u00e0m tan ch\u1ea3y b\u1ed9t silicon dioxide. C\u00e1c gi\u1ecdt h\u00ecnh c\u1ea7u \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh do s\u1ee9c c\u0103ng b\u1ec1 m\u1eb7t c\u1ee7a ch\u1ea5t l\u1ecfng v\u00e0 c\u00e1c h\u1ea1t h\u00ecnh c\u1ea7u \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh trong qu\u00e1 tr\u00ecnh l\u00e0m m\u00e1t nhanh<\/td>N\u0103ng l\u01b0\u1ee3ng cao, truy\u1ec1n nhi\u1ec7t nhanh, l\u00e0m m\u00e1t nhanh, h\u00ecnh th\u00e1i s\u1ea3n ph\u1ea9m thu \u0111\u01b0\u1ee3c c\u00f3 th\u1ec3 ki\u1ec3m so\u00e1t \u0111\u01b0\u1ee3c, \u0111\u1ed9 tinh khi\u1ebft cao, kh\u00f4ng k\u1ebft t\u1ee5<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\"Spherization\"<\/figure>\n\n\n\n

Nguy\u00ean l\u00fd v\u00e0 quy tr\u00ecnh s\u1ea3n xu\u1ea5t b\u1ed9t vi silicon h\u00ecnh c\u1ea7u b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p n\u1ea5u ch\u1ea3y plasma t\u1ea7n s\u1ed1 cao t\u01b0\u01a1ng t\u1ef1 nh\u01b0 ph\u01b0\u01a1ng ph\u00e1p t\u1ed5ng h\u1ee3p ng\u1ecdn l\u1eeda. S\u1ef1 kh\u00e1c bi\u1ec7t l\u00e0 s\u1eed d\u1ee5ng m\u00e1y ph\u00e1t plasma l\u00e0m ngu\u1ed3n nhi\u1ec7t. Ph\u1ea1m vi nhi\u1ec7t \u0111\u1ed9 v\u1eeba ph\u1ea3i, ki\u1ec3m so\u00e1t \u1ed5n \u0111\u1ecbnh v\u00e0 \u0111\u1ea7u ra cao. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y cho ph\u00e9p c\u00f3 \u0111\u1ed9 c\u1ea7u cao h\u01a1n, l\u00e0m cho n\u00f3 tr\u1edf th\u00e0nh ph\u01b0\u01a1ng ph\u00e1p s\u1ea3n xu\u1ea5t ph\u00f9 h\u1ee3p.<\/p>\n\n\n\n

Ph\u01b0\u01a1ng ph\u00e1p th\u1ee7y ph\u00e2n bao g\u1ed3m vi\u1ec7c th\u00eam SiCl\u2084 l\u1ecfng v\u1edbi t\u1ed1c \u0111\u1ed9 kh\u00f4ng \u0111\u1ed5i v\u00e0o n\u01b0\u1edbc kh\u1eed ion v\u1edbi c\u00e1c ch\u1ea5t ph\u00e2n t\u00e1n kh\u00e1c nhau. M\u1ed9t thanh th\u1ea1ch anh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 khu\u1ea5y nhanh s\u1ea3n ph\u1ea9m h\u00f2a tan trong n\u01b0\u1edbc. S\u1ea3n ph\u1ea9m th\u1ee7y ph\u00e2n \u0111\u01b0\u1ee3c \u1ee7, r\u1eeda v\u00e0 l\u1ecdc. Sau \u0111\u00f3, s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c s\u1ea5y kh\u00f4 \u1edf nhi\u1ec7t \u0111\u1ed9 100\u00b0C-200\u00b0C trong bu\u1ed3ng nhi\u1ec7t \u0111\u1ed9 kh\u00f4ng \u0111\u1ed5i cho \u0111\u1ebfn khi \u0111\u1ea1t tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4ng \u0111\u1ed5i. Sau khi s\u1ea5y kh\u00f4, s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ebfn l\u00f2 thi\u00eau k\u1ebft nhi\u1ec7t \u0111\u1ed9 cao. T\u1ea1i \u0111\u00e2y, s\u1ea3n ph\u1ea9m tr\u1ea3i qua qu\u00e1 tr\u00ecnh t\u00e1ch n\u01b0\u1edbc v\u00e0 chuy\u1ec3n pha \u1edf c\u00e1c nhi\u1ec7t \u0111\u1ed9 kh\u00e1c nhau. S\u1ea3n ph\u1ea9m cu\u1ed1i c\u00f9ng \u0111\u01b0\u1ee3c nghi\u1ec1n v\u00e0 s\u00e0ng \u0111\u1ec3 thu \u0111\u01b0\u1ee3c b\u1ed9t silic h\u00ecnh c\u1ea7u c\u00f3 \u0111\u1ed9 tinh khi\u1ebft cao v\u1edbi k\u00edch th\u01b0\u1edbc h\u1ea1t mong mu\u1ed1n.<\/p>\n\n\n\n

b\u1ed9t s\u1eed thi<\/a><\/h2>\n\n\n\n
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