Sodium metasilicate pentahydrate
Mekhoa ea ho kopanya ea metasilicate ea sodium e kenyelletsa mokhoa oa ho omisa, mokhoa oa ho qhibiliha oa crystallization, mokhoa oa nako e le 'ngoe oa granulation le mokhoa oa tharollo oa crystallization.
Ts'ebetso ea crystallization e na le litšobotsi tsa lichelete tse fokolang tsa thepa, theko e tlaase ea tlhahiso le boleng bo tsitsitseng. Phallo ea ts'ebetso e bontšoa ka tsela e latelang
2.1 Phello ea mahloriso a kristale
Sodium metasilicate pentahydrate e lokiselitsoe ke tharollo ea crystallization process. Ho ea ka setšoantšo sa mohato [3], mahloriso a tharollo ea eona ea crystallization (Na2O + SiO2) e lokela ho laoloa hafeela
Sodium metasilicate pentahydrate e ka hlahisoa ka mefuta e fapaneng ea 25% ~ 28% (karolo ea boima). Leha ho le joalo, ho na le N a2O e lekaneng le SiO 2 tharollong
Palo e ameha ka bobeli. Karolo ea boima ba 8i02 e phahame, nako ea crystallization e telele, 'me karolelano ea ketane ea n (Na2O) / n (SiO2) e sebelisoang ka ho toba ke 1,
Tharollo e nang le karolo ea 58% ea boima e khabisitsoe, 'me peō ea kristale ea eketsoa. Potoloho ea crystallization e nka 72 ~ 120h; Lintho tse phahameng tsa Na2O
Lebelo le potlakile, empa lebelo le potlakileng la kristallise le bonolo ho baka likaroloana tse ntle tsa kristale, Na2O e eketsehileng e kenngoeng ke kholo ea kristale, 'me ho thata ho fihlella modulus ea sehlahisoa.
Ho fumana litlhoko, sheba Lethathamo la 1.
2.2 Phello ea peo
Ts'ebetsong ea crystallization ea sodium metasilicate, e le ho laola boleng ba kristale le ho fumana lihlahisoa tse nang le boholo bo lekanang.
Kenya peo ea kristale e nang le boholo bo loketseng le bongata, 'me ka bonolo u hlohlelletse ts'ebetso eohle ho etsa hore peo ea kristale e fanyehe ka mokhoa o ts'oanang tharollong eohle.
Fokotsa palo ea nucleation ea bobeli, e le hore thepa e khabisitsoeng e hōle feela holim'a peō ea kristale.
Palo ea kristale ea peo e kenyellelitsoeng e ipapisitse le boleng, mefuta e fapaneng le boholo ba sehlahisoa se ka khabisoang nakong ea ts'ebetso eohle ea kristallise le sehlahisoa se lakatsehang.
Granularity ea. Ho nka hore ha ho na peo ea mantlha ea nucleating e hlahisoang ts'ebetsong, palo ea likaroloana tsa sehlahisoa se felileng e lekana le palo ea likaroloana tse ncha tsa peo ea maiketsetso.
Mp/KvpLp3=Ms/KvLs3P, ebe M s=Mp (Ls/Lp) 3
Moo: M s, M p —— boleng ba peo ea kristale le sehlahisoa se felileng; Ls, Lp -- karolelano ea boholo ba peō ea kristale le sehlahisoa se felileng; K v, P metasilicic acid
Ntho ea 'mele e tsitsitseng ea sodium.
Bakeng sa ts'ebetso ea crystallization ea sodium metasilicate aqueous solution, ho latela tlhahlobo ea phetoho ea kristale, ka lebaka la bophara bo moqotetsane ba sebaka sa eona sa metastable, ho bonolo ho kena.
Sebakeng se sa tsitsang, lipeo tse nang le karoloana ea 0.1-0.2mm hangata lia eketsoa. Haeba karolelano ea boholo ba karoloana ea sehlahisoa se phethiloeng e hlokeha ho ba 1mm Ho nahanoa ka se ke keng sa qojoa
Palo ea nucleation ea tharollo ea mahala ka boeona ke 40% ~ 60% ea karoloana e kholo ha lipeo tsa kristale tsa 0.1 m li hlile li eketsoa.
2.3 Tšusumetso ea taolo ea mocheso
Ts'ebetso ea crystallization ea sodium metasilicate pentahydrate e na le maikutlo a mocheso, mme kholo ea eona ea kristale e hloka ho feta ts'ebetsong ea induction, e amoheloang lipakeng tsa 50-60 ℃.
Palo eohle ea li-nuclei tsa kristale e laoloa ka ho eketsa peo ea kristale ho tharollo, ebe kristale e ntse e hōla ka tekanyo e ts'oanang tlas'a mocheso o batlang o le teng le supersaturation. Nakong ea morao-rao ea crystallization, phola ka sekhahla sa 1 ℃ ka motsotso ho etsa hore kristale e hōle ka potlako, 'me u arole thepa ha e fihla ho 38-48 ℃.
2.4 Tšusumetso ea li-additives tse ling
E le ho nolofalletsa ho arohana ha metsi a mahala le kristale nakong ea ts'ebetso ea ho arohana, karolelano ea 0.005% ~ 0.015% ea chelete eohle e tla nkoa 0.5h pele ho fela ha pholileng.
Khohlano e kaholimo lipakeng tsa kristale le metsi e ka fokotsoa ka ho eketsa dodecyl sulfonic acid surfactant hang, e ka lokollang sampole e metsi.
Metsi a theoha ka tlase ho 4% bakeng sa ho omisa le ho boloka
Nako ea poso: Oct-13-2022