Kev Tsim Khoom Ntawm Aluminium Hydroxide

1. Nyob rau hauv cov tshuaj txhuas sulfate, ntxiv alkaline tov nyob rau hauv stirring los ua ib tug precipitate, uas yog ntxuav, lim, thiab qhuav ntawm qhov kub thiab txias, thiab ces pulverized kom tau cov khoom tiav. Lub cev qhuav dej tuaj yeem siv ncaj qha los ua cov khoom lag luam. Lub concentration, kub, tshuaj tiv thaiv kub tswj thiab ziab kub ntawm cov tshuaj nyob rau hauv kev npaj cuam tshuam rau cov khoom zoo.

2. Qhov kev txiav txim ntawm sulfuric acid thiab txhuas hmoov los yog txhuas tshauv los tsim aluminium sulfate, thiab tom qab ntawd metathesis cov tshuaj tiv thaiv nrog ammonium bicarbonate kom tau txais aluminium hydroxide. Los yog neutralize nrog sodium aluminate tov thiab txhuas sulfate tov rau pH 6.5 los ua txhuas hydroxide precipitate, ntxuav nrog dej, lim hauv siab, qhuav ntawm 70-80 degree, thiab ces pulverize kom tau txhuas hydroxide. Nws cov tshuaj tiv thaiv formula:

3. Dej aluminium oxygen muaj:

(1) under the condition of 40～60℃, pH>12, tshuab carbon dioxide rau hauv sodium aluminate aqueous tov; tso rau ntawm chav tsev kub yam tsis tau ntxiv lossis ntxiv hydrate aluminium oxide crystal noob rau sodium aluminate aqueous tov;

(2) Al(OC2H5)3 thiab 1 feem pua ​​-20 feem pua ​​​​ethanolamine NH2C2H4OH coexist, hydrolyze ntawm 20-60 degree , thiab hnub nyoog cov gel tshwm sim rau ob peb lub hlis.

Bayerite muaj:

1) Tshuab carbon dioxide rau hauv sodium aluminate aqueous tov ntawm qhov kub thiab txias;

2) Aluminium amalgam yog hydrolyzed ntawm qhov kub thiab txias;

(3) Al (OC2H5) 3 yog hydrolyzed hauv qab 70 degree;

(4) Ib txoj hauv kev ntawm neutralizing aqueous aluminium chloride tov nrog alkali hlau hydroxide lossis ammonia, thiab lwm yam. Lub boehmite muaj txoj kev xws li hydrothermal kev kho mob ntawm txhuas hydroxide nyob rau hauv aluminium hydroxide aqueous tov los yog qaug zog alkaline aqueous tov ntawm 150-300 degree C; aluminium amalgam yog oxidized nrog boiling dej. Thaj chaw ruaj khov ntawm diaspore yog 275-425 degree, thiab cov dej vapor siab siab tshaj 140atm (1atm=98}.066kPa). Raws li cov lus ceeb toom, diaspore tuaj yeem tau txais los ntawm kev kho hydrothermal ntawm aluminium hydroxide, thiab kev kho hydrothermal ntawm ρ alumina thiab χ alumina generated los ntawm hydrazine-oxygen nqus lub cev qhuav dej.