Njira yopanga sodium metasilicate pentahydrate

Sodium metasilicate pentahydrate Production process

Njira zophatikizira za sodium metasilicate zikuphatikiza njira yowumitsa, kusungunula kulimba kwa kristalo, njira yanthawi imodzi ya granulation ndi njira yothetsera crystallization.

The ndondomeko crystallization ali makhalidwe a ndalama zochepa zida, mtengo wotsika kupanga ndi khalidwe khola. Njira yoyendera ikuwonetsedwa motere

Njira yopanga sodium metasilicate pentahydrate

2.1 Zotsatira za crystal concentration

Sodium metasilicate pentahydrate imakonzedwa ndi njira yothetsera crystallization. Malinga ndi chithunzi cha gawo [3], kuchuluka kwa yankho la crystallization (Na2O + SiO2) kuyenera kuyendetsedwa bola ngati

Sodium metasilicate pentahydrate akhoza kupangidwa mu osiyanasiyana 25% ~ 28% (misa kachigawo). Komabe, pali N a2O yokwanira ndi SiO 2 mu yankho

Chiwerengerocho chimakhudzidwa. Gawo lalikulu la 8i02 ndi lalitali, nthawi ya crystallization ndi yaitali, ndipo chiwerengero cha n (Na2O) / n (SiO2) chimagwiritsidwa ntchito mwachindunji ndi 1,

Yankho lomwe lili ndi gawo la 58% limawunikiridwa, ndipo mbewu ya kristalo imawonjezeredwa. The crystallization mkombero amatenga 72 ~ 120h; Mtengo wapatali wa magawo NA2O

Liwiro ndi mofulumira, koma mofulumira crystallization liwiro n'zosavuta chifukwa chabwino galasi particles, kwambiri Na2O anaphunzitsidwa ndi kukula galasi, ndi modulus mankhwala n'zovuta kufika.

Kuti mupeze zofunikira, onani Table 1.

nthawi ya crystallization

2.2 Zotsatira za mbeu

Mu crystallization ndondomeko ya sodium metasilicate, pofuna kulamulira khalidwe galasi ndi kupeza mankhwala ndi yunifolomu tinthu kukula.

Onjezani njere za kristalo zokhala ndi kukula koyenera ndi kuchuluka kwake, ndipo yambitsani zonse pang'onopang'ono kuti njere za kristalo zikhazikike mofanana mu yankho lonse.

Chepetsani kuchuluka kwa nucleation yachiwiri, kuti zinthu zonyezimira zimangokulira pamwamba pa mbewu ya kristalo.

Kuchuluka kwa krustalo yambewu yowonjezeredwa kumadalira mtundu, mitundu ndi kukula kwa tinthu tating'onoting'ono tazinthu zomwe zimatha kuwunikira panthawi yonse ya crystallization ndi zomwe mukufuna.

The granularity wa. Pongoganiza kuti palibe mbewu yoyambira ya nucleating yomwe imapangidwa panthawiyi, kuchuluka kwa tinthu tating'onoting'ono muzinthu zomalizidwa ndikufanana ndi tinthu tambirimbiri tambiri tambiri tambiri tambiri tambiri.

Mp/KvpLp3=Ms/KvLs3P, kenako M s=Mp (Ls/Lp) 3

Kumene: M s, M p —— khalidwe la mbewu ya kristalo ndi mankhwala omalizidwa; Ls, Lp -- kukula kwa tinthu tating'ono ta kristalo ndi zinthu zomalizidwa; K v, P metasilicic acid

Thupi katundu nthawi zonse sodium.

Pakuti crystallization ndondomeko ya sodium metasilicate amadzimadzi njira, malinga ndi kusanthula galasi gawo kusintha, chifukwa cha yopapatiza m'lifupi mwake metastable zone, n'zosavuta kulowa.

M'malo osakhazikika, mbewu zokhala ndi tinthu tating'ono 0.1-0.2mm nthawi zambiri zimawonjezeredwa. Ngati pafupifupi tinthu kukula kwa yomalizidwa mankhwala chofunika kukhala 1mm Poganizira zosalephereka

Kuchuluka kwa nucleation ya yankho laulere palokha ndi 40% ~ 60% ya gawo lalikulu pomwe 0.1 m kristalo mbewu zimawonjezeredwa.

2.3 Chikoka chowongolera kutentha

Njira ya crystallization ya sodium metasilicate pentahydrate imakhudzidwa ndi kutentha, ndipo kukula kwake kwa kristalo kumafunika kudutsa njira yophunzitsira, yomwe imatengedwa pakati pa 50-60 ℃.

Kuchuluka kwa kristalo nuclei kumayendetsedwa ndi kuwonjezera mbewu za kristalo ku yankho, ndiyeno kristalo imakula pamlingo wofanana pansi pa kutentha kosalekeza ndi supersaturation. Mu gawo lotsatira la crystallization, kuziziritsa pamlingo wa 1 ℃ pamphindi kuti kristalo ikule mwachangu, ndikulekanitsa zinthuzo zikafika 38-48 ℃.

2.4 Zotsatira za zowonjezera zina

Kuti athe kulekanitsa madzi aulere ndi kristalo panthawi yolekanitsa, chiŵerengero cha 0.005% ~ 0.015% cha ndalama zonse chidzatengedwa 0.5h isanathe kuzirala.

Kusagwirizana kwapamtunda pakati pa krustalo ndi madzi kumatha kuchepetsedwa powonjezera dodecyl sulfonic acid surfactant kamodzi, komwe kumatha kumasula zitsanzo zonyowa.

Madzi amatsika pansi pa 4% poyanika ndi kusunga


Nthawi yotumiza: Oct-13-2022
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