Txoj kev npaj ntawm mica ntawv pulp calcining tshuaj pulping

Cov mica sib cais yog calcined ntawm qhov kub siab kom tshem tawm ib feem ntawm cov dej siv lead ua hauv cov qauv mica, yog li cov mica flakes yuav nthuav dav nyob rau hauv cov kev taw qhia perpendicular mus rau lub cleavage nto, thiab kev ntxhib los mos yuav ua mos, thiab tom qab ntawd chemically kho kom ua. cov mica flakes puv Cov av sib cais yog cais, thiab ces nws yog ntxuav thiab muab faib mus rau hauv ib tug slurry. Daim ntawv mica uas yog pulped thiab ua los ntawm txoj kev no yog hu ua hmoov mica ntawv.

ib. Sorting thiab ziab ntawm mica raw cov ntaub ntawv

Cov ntaub ntawv raw siv nyob rau hauv ntuj mica ntawv yog tsuas yog scraps ntawm ntuj crushed mica thiab flake mica ua. Lub hom phiaj ntawm kev sorting yog tsuas yog tshem tawm cov nplaum flakes, biotite, ntsuab mica, thiab lwm yam impurities thiab txawv teb chaws impurities uas tsis haum rau ua mica ntawv. Txhawm rau ua kom cov calcining zoo ntawm mica, tuab mica flakes nrog lub thickness ntau dua 1.2 hli yuav tsum tau muab tshem tawm. Cov mica sorted yog ntxuav los ntawm kev ntxiv dej hauv lub cylindrical screen lossis vibrating npo kom tshem tawm cov impurities xws li xuab zeb thiab xuab zeb hauv cov khoom siv mica thiab sieve tawm cov khoom zoo uas me me dhau los ua kom huv cov khoom siv mica. Cov mica purified muaj 20% ~ 25% ntawm cov dej, uas yuav tsum tau muab tshem tawm kom txo tau cov ntsiab lus ntawm cov dej txuas mus rau tsawg dua 2%. Kev ziab yog nqa tawm ntawm lub tshuab ziab khaub ncaws tshwj xeeb, siv chav ua cua sov.

b. Calcination ntawm mica

Muab cov mica tso rau hauv qhov cub hluav taws xob tshwj xeeb, ua kom sov rau 700 ~ 800 ℃, thiab khaws cia rau 50 ~ 80min kom tshem tawm cov dej siv lead ua hauv cov mica crystals, thiab tau txais cov khoom zoo mica rau pulping. Lub calcination ntawm mica tam sim no feem ntau siv indirect cua sov rotary kilns. Lub calcined mica clinker yuav tsum tau kuaj xyuas kom tshem tawm cov av, cov hmoov tshauv combustible thiab mica fragments nrog ib txoj kab uas hla ntawm tsawg tshaj li 6 hli uas yog Ameslikas sandwiched ntawm cov mica txheej. Lub calcining zoo ntawm mica yuav cuam tshuam rau cov khoom siv hluav taws xob, hloov tau yooj yim, folding tsis kam, tensile zog thiab pulping tus nqi ntawm mica ntawv.

c. Kev npaj ntawm hmoov mica slurry

Cov calcined mica (clinker) yog chemically kho kom nws mus rau hauv ib tug scaly slurry uas yuav dispersed nyob rau hauv dej thiab tshem tawm uniformly, thiab cov dej-soluble impurities raug tshem tawm los ntawm kev ntxuav kom tau raws li qhov yuav tsum tau ntawm cov txheej txheem papermaking.