Cov Kev Xav Tau rau Sodium formaldehyde sulphoxylate-Kitty

1.2 Raw cov ntaub ntawv thiab kev xav tau:

Sodium metabisulfite (Na2S2O5): Kev Lag Luam Qib I nrog cov ntsiab lus ntawm> 64% (raws li SO2).

Muaj formaldehyde tov: qib thawj los yog thib ob.

Zinc hlau hmoov: 98% tag nrho zinc, tsis tsawg dua 94% zinc hlau, zinc hmoov nrog grey tsos.

1.3 Cov txheej txheem ntau lawm thiab tswj

Kev tsim cov sodium formaldehydesulphoxylate los ntawm txoj kev no feem ntau suav nrog peb txheej txheem: kev sib cais-txo ntxiv cov tshuaj tiv thaiv, cov kua dej sib cais thiab evaporation thiab crystallization.

(1) Dissolution-txo ntxiv cov tshuaj tiv thaiv: cov tshuaj tiv thaiv yog nqa tawm nyob rau hauv lub porcelain-lined reactor nrog nplawm.

Raws li ib qho piv txwv, sodium metabisulphite, dej, zinc hmoov thiab formaldehyde tov yog ntxiv rau cov tshuaj tiv thaiv kettle, thiab ib co ntawm cov additives yog ntxiv kom ceev cov tshuaj tiv thaiv ceev thiab tiam ntawm sodium formaldehydesulphoxylate. Tom qab tag nrho cov ntaub ntawv ntxiv, cov tshuaj tiv thaiv yog rhuab indirect los ntawm chav nyob rau hauv ib tug kaw stirred kettle nrog tas li stirring thiab tas li kub thaum lub kub ntawm cov tshuaj nyob rau hauv lub boiler nce mus txog 95 ° C.

Cov ntaub ntawv yog reactedaround2h thiab coj mus kuaj.

Qhov sib npaug ntawm cov tshuaj tiv thaiv yog:

Na2S2O5+2Zn+2CH2O+6H2O=2NaHSO2-CH2O-2H2O+ZnO↓+Zn(OH)2↓

Thaum lub sij hawm cov tshuaj tiv thaiv, ntxiv rau cov zis ntawm sodium formaldehydesulphoxylate, zinc hmoov koom nrog cov tshuaj tiv thaiv yog hloov mus rau zinc oxide thiab zinc hydroxide.

Raws li zinc hmoov ntxiv ntau dhau, tseem muaj me me ntawm cov hlau zinc thiab peb hu ua cov khoom no zinc sludge.

(2) Kev sib cais ntawm cov kua-kua: Tom qab cov tshuaj tiv thaiv tiav, kev ua kom txias tsis ncaj yog nqa nrog dej.

Qhov kub ntawm cov khoom raug txo kom qis dua 50 ° C rau cov khoom sib cais-kua. Vim hais tias ntawm qhov corrosive xwm ntawm cov tshuaj, cov khoom-kua sib cais yog nqa tawm siv hydraulically pressurized yas phaj roj hmab thav duab lim. Lub filtrate yog pumped mus rau qhov tsim nyog kua cia tank. Tom qab cov tshuaj tau qhia meej nyob rau hauv lub reservoir rau ib lub sij hawm thiab ces lim lub thib ob lub sij hawm muab ib tug ntshiab ntshiab tov rau evaporation thiab concentration.

(3) Evaporation thiab concentration, txias thiab crystallisation: sodium formaldehydesulphoxylate tov nyob rau hauv lub tank cia yog pumped rau hauv lub tshuab nqus tsev evaporation hlab ntsha los ntawm lub tshuab nqus tsev vacuum.

Indirectly rhuab los ntawm chav, cov txheej txheem evaporation tswj qhov kub hauv qab 65 ° C. Thaum cov concentration ntawm cov tshuaj nyob rau hauv lub evaporator ncav cuag qhov yuav tsum tau, cov concentrate yog muab tso rau hauv lub crystalliser, txias thiab crystallized nyob rau hauv chav tsev kub thiab cov loj pieces yog crushed, ces cov qauv raug coj mus kuaj raws li tus qauv, thiab cov khoom tsim nyog yog ntim.