生產(chan)(chan)石(shi)(shi)(shi)(shi)膏(gao)(gao)(gao)(gao)的原料(liao)主要為含硫酸(suan)鈣(gai)的天(tian)然石(shi)(shi)(shi)(shi)膏(gao)(gao)(gao)(gao)(又稱生石(shi)(shi)(shi)(shi)膏(gao)(gao)(gao)(gao))或含硫酸(suan)鈣(gai)的化(hua)工副產(chan)(chan)品和磷(lin)石(shi)(shi)(shi)(shi)膏(gao)(gao)(gao)(gao)、氟石(shi)(shi)(shi)(shi)膏(gao)(gao)(gao)(gao)、硼石(shi)(shi)(shi)(shi)膏(gao)(gao)(gao)(gao)等廢渣,其(qi)化(hua)學式(shi)為CaSO4.1/2H2O,也(ye)稱半(ban)水(shui)(shui)(shui)石(shi)(shi)(shi)(shi)膏(gao)(gao)(gao)(gao)。將(jiang)天(tian)然二水(shui)(shui)(shui)石(shi)(shi)(shi)(shi)膏(gao)(gao)(gao)(gao)在不同(tong)(tong)的溫度下(xia)煅燒可得到不同(tong)(tong)的石(shi)(shi)(shi)(shi)膏(gao)(gao)(gao)(gao)品種。如將(jiang)天(tian)然二水(shui)(shui)(shui)石(shi)(shi)(shi)(shi)膏(gao)(gao)(gao)(gao)在107~170℃的干(gan)燥條件下(xia)加(jia)熱可得建筑石(shi)(shi)(shi)(shi)膏(gao)(gao)(gao)(gao)。
將(jiang)建筑(zhu)石膏(gao)加水(shui)后,它首(shou)先(xian)(xian)溶解于(yu)(yu)水(shui),然后生(sheng)(sheng)(sheng)(sheng)成二(er)水(shui)石膏(gao)析出。隨著水(shui)化的(de)(de)(de)不斷(duan)進行,生(sheng)(sheng)(sheng)(sheng)成的(de)(de)(de)二(er)水(shui)石膏(gao)膠體(ti)(ti)(ti)(ti)微(wei)粒(li)不斷(duan)增多,這(zhe)些(xie)微(wei)粒(li)比(bi)原先(xian)(xian)更(geng)加細小,比(bi)表面積很大,吸附(fu)著很多的(de)(de)(de)水(shui)分;同(tong)時(shi)(shi)漿(jiang)(jiang)體(ti)(ti)(ti)(ti)中的(de)(de)(de)自(zi)由(you)水(shui)分由(you)于(yu)(yu)水(shui)化和(he)蒸發而不斷(duan)減少,漿(jiang)(jiang)體(ti)(ti)(ti)(ti)的(de)(de)(de)稠度不斷(duan)增加,膠體(ti)(ti)(ti)(ti)微(wei)粒(li)間的(de)(de)(de)黏結(jie)逐步(bu)增強,顆粒(li)間產(chan)(chan)生(sheng)(sheng)(sheng)(sheng)摩擦力(li)和(he)黏結(jie)力(li),使(shi)漿(jiang)(jiang)體(ti)(ti)(ti)(ti)逐漸失去可塑性(xing),即(ji)漿(jiang)(jiang)體(ti)(ti)(ti)(ti)逐漸產(chan)(chan)生(sheng)(sheng)(sheng)(sheng)凝(ning)結(jie)。繼續水(shui)化,膠體(ti)(ti)(ti)(ti)轉變成晶體(ti)(ti)(ti)(ti)。晶體(ti)(ti)(ti)(ti)顆粒(li)逐漸長大,使(shi)漿(jiang)(jiang)體(ti)(ti)(ti)(ti)完(wan)全失去可塑性(xing),產(chan)(chan)生(sheng)(sheng)(sheng)(sheng)強度,即(ji)漿(jiang)(jiang)體(ti)(ti)(ti)(ti)產(chan)(chan)生(sheng)(sheng)(sheng)(sheng)了(le)硬(ying)化。這(zhe)一過程不斷(duan)進行,直至漿(jiang)(jiang)體(ti)(ti)(ti)(ti)完(wan)全干燥,強度不在增加,此(ci)時(shi)(shi)漿(jiang)(jiang)體(ti)(ti)(ti)(ti)已硬(ying)化成人造石材。
海南石膏批發是(shi)以建(jian)筑(zhu)石(shi)(shi)膏為主(zhu)要原(yuan)材料,經(jing)加水攪拌、澆注(zhu)成型(xing)和(he)干燥制成的輕質建(jian)筑(zhu)石(shi)(shi)膏制品(pin)。生產中允許(xu)加入(ru)纖維增強(qiang)材料或輕集料,也可(ke)加入(ru)發泡劑(ji)。石(shi)(shi)膏砌塊具有隔聲(sheng)防火、施工便捷等多項(xiang)優點,是(shi)一種低碳環保(bao)、健康、符合時代(dai)發展要求(qiu)的新型(xing)墻體(ti)材料。