Is Nrias teb tsim cov khoom pov tseg ntau ntawm cov khoom siv los ntawm ntau yam kev lag luam agro. Ntawm cov pov tseg no, kev siv phosphogypsum, fluorogypsum, slag, yoov tshauv, txiv qaub sludges, thiab lwm yam yog qhov tseem ceeb vim lawv muaj ntau heev thiab cov dej paug hauv av yuav tshwm sim los ntawm lawv cov pov tseg uas tsis tau npaj tseg rau ntawm thaj av fertile. Kev siv cov khib nyiab gypsum tshwj xeeb tshaj yog phosphogypsum (PG) thiab fluorogypsum (FG) yog qhov tseem ceeb. Tsis zoo li PG, kev siv FG, kev lag luam pov tseg ntawm hydrofluoric acid kuj tseem ceeb heev vim nws dhau los ua kom muaj kuab paug ntawm huab cua thiab dej hauv av. Kev tshawb fawb ua tiav ntawm CBRI tau pom tias muaj txiaj ntsig cementitious binder tuaj yeem tsim los ntawm kev sib xyaw me me ntawm Ca (OH) 2 thiab cov tshuaj ntxiv nrog FG ua raws li kev ua kom zoo. Cov ntaub ntawv qhia tau hais tias lub plaster / binder ntawm qhov xav tau dej tsawg, muaj zog compressive siab thiab nqus dej tsawg tuaj yeem tsim tau. Lub hydration ntawm binder raws li kev soj ntsuam los ntawm qhov sib txawv thermal tsom xam (DTA) qhia sai hloov ntawm anhydrite theem mus rau dihydrate gypsum. Qhov sib ntxiv ntawm 15-20 feem pua pov tseg cov txiv qaub sludge yuav ntxiv kev lag luam rau cov ntaub ntawv tshiab. FG binder yog tsim rau kev ua vaj tsev cib, flooring vuas thiab plastering uas tej zaum yuav xam tau tias yog ib lub tswv yim tshiab rau kev siv tau zoo thiab pov tseg ntawm FG pov tseg kom tau txais kev lag luam rau HF kev lag luam nrog rau lub teb chaws. Tus nqi ntse FG binder yog pheej yig dua li cov txiv qaub thiab cov cement binders. Kev siv tshuab ntawm lub zog siab plaster los ntawm FG thiab nws siv hauv kev ua cov vuas flooring tau ua lag luam.
Dr. Manjit Singh, Yav dhau los Scientist 'G" (Tus Thawj Coj Qib Tus Kws Tshawb Fawb) & Lub taub hau, Environmental S&T & Clay Products Divisions, Central Building Research Institute, Roorkee (India) Advisor/Consultant to Gypsum & Cement Industries
Taw qhia
Cov khib nyiab ntau yog tsim los ntawm kev lag luam xws li metallurgy, petrochemicals, chiv, ntawv thiab pulp ua ib xyoos ib zaug hauv Is Nrias teb. Los ntawm lub tsev cov ntaub ntawv lub kaum sab xis, kev siv ya tshauv, slags, phosphogypsum, fluorogypsum, xovxwm av nkos, liab av nkos thiab lwm yam yog qhov tseem ceeb. Tshaj li 6.5 lab tonnes ntawm cov khoom lag luam gypsum yog tsim txhua xyoo los ntawm ntau qhov kev lag luam phosphatic thiab hydro-fluoric acid hauv Is Nrias teb, Singh1. Cov khib nyiab ntawm phosphoric acid kev lag luam nrov npe hu ua phosphogypsum yog muaj rau ntau yam. Fluorogypsum pov tseg ntawm hydrofluoric acid chaw tsim tshuaj paus tau kawm rau siv nyob rau hauv supersulphated xis mas los yog binding agents raws li qhia los ntawm Taneja, et.al 2 , Swanski 3.
Nyob rau hauv Tuam Tshoj Tuam Tshoj, zoo li cementitious binders raws li fluorogypsum tau tsim los ntawm Yan et.al.4-5. Kev siv fluorogypsum uas muaj nyob rau ntawm me ntsis ntau dua 1.0 lab tonne ib xyoo yog qhov tseem ceeb. Fluorogypsum muaj impurities ntawm fluoride thiab dawb acidity. Cov impurities tshwj xeeb yog dawb acidity tuaj yeem cuam tshuam nrog kev teeb tsa thiab kev txhim kho lub zog ntawm plaster / tsev khoom. Txij li thaum kev siv fluorogypsum tsuas yog txwv, yog li, muaj teeb meem pov tseg ntawm cov khoom pov tseg no thiab nws tau dhau los ua qhov tseem ceeb rau kev siv cov khoom siv hauv cov khoom muaj nqis ntxiv.
