石灰石生產機械制造用的鑄造型砂。石灰石生產的鑄砂粒度為28～ 75 目,這種型砂具有比石英砂更優的性能,潰散性好,易于落砂清理,提高鑄件表面質量,增加鑄件表面光潔度,同時基本消除職工矽肺的危害。據統計僅各大鋼鐵公司每年要外購鑄造型砂幾萬噸,這對冶金行業的石灰石礦是一個潛在的市場。
玻璃由石灰石、石英砂、純堿等混合，經高溫熔融制得。煉鐵用石灰石作熔劑，除去脈石。煉鋼用生石灰做造渣材料，除去硫、磷等有害雜質。電石（主要成分是CaC2）是生石灰與焦炭在電爐里反應制得。純堿是用石灰石、食鹽、氨等原料經過多步反應制得（索爾維法）。利用消石灰和純堿反應制成燒堿（苛化法）。利用純凈的消石灰和氯氣反應制得漂白的。利用石灰石的化學加工制成氯化鈣、硝酸鈣、亞硫酸鈣等重要鈣鹽。
消石灰能除去水的暫時硬性，用作硬水軟化劑。石灰石燒加工制成較純的粉狀碳酸鈣，用做橡膠、塑料、紙張、牙膏、化妝品等的填充料。石灰與燒堿制成的堿石灰，用作二氧化碳的吸收劑。生石灰用作干燥劑和消毒劑。農業上，用生石灰配制石灰硫黃合劑、波爾多液等農藥。土壤中施用熟石灰可中和土壤的酸性、改善土壤的結構、供給植物所需的鈣素。用石灰漿刷樹干，可保護樹木。
生(sheng)(sheng)(sheng)(sheng)石(shi)(shi)(shi)(shi)灰(hui)石(shi)(shi)(shi)(shi)用(yong)(yong)作建(jian)筑石(shi)(shi)(shi)(shi)材(cai)(cai)。民用(yong)(yong)平房或樓(lou)房多用(yong)(yong)廉價(jia)的(de)(de)(de)石(shi)(shi)(shi)(shi)灰(hui)石(shi)(shi)(shi)(shi)做(zuo)地(di)基(ji)，目(mu)的(de)(de)(de)是(shi)為了使房子(zi)更結實、更牢固，同時(shi)也是(shi)為了降(jiang)低建(jian)設成(cheng)(cheng)(cheng)本。生(sheng)(sheng)(sheng)(sheng)石(shi)(shi)(shi)(shi)灰(hui)石(shi)(shi)(shi)(shi)用(yong)(yong)作燒制生(sheng)(sheng)(sheng)(sheng)石(shi)(shi)(shi)(shi)灰(hui)。在高溫的(de)(de)(de)條件下石(shi)(shi)(shi)(shi)灰(hui)石(shi)(shi)(shi)(shi)中的(de)(de)(de)碳(tan)酸(suan)鈣(gai)(gai)(gai)（CaCO3）分解生(sheng)(sheng)(sheng)(sheng)成(cheng)(cheng)(cheng)氧(yang)(yang)化(hua)(hua)鈣(gai)(gai)(gai)(CaO)和二氧(yang)(yang)化(hua)(hua)碳(tan)（CO2）。生(sheng)(sheng)(sheng)(sheng)成(cheng)(cheng)(cheng)的(de)(de)(de)氧(yang)(yang)化(hua)(hua)鈣(gai)(gai)(gai)，俗名叫做(zuo)生(sheng)(sheng)(sheng)(sheng)石(shi)(shi)(shi)(shi)灰(hui)，主要用(yong)(yong)做(zuo)建(jian)筑材(cai)(cai)料，其用(yong)(yong)法是(shi)先使生(sheng)(sheng)(sheng)(sheng)石(shi)(shi)(shi)(shi)灰(hui)與(yu)水化(hua)(hua)合(he)生(sheng)(sheng)(sheng)(sheng)成(cheng)(cheng)(cheng)氫(qing)氧(yang)(yang)化(hua)(hua)鈣(gai)(gai)(gai)[Ca（OH）2]，再使氫(qing)氧(yang)(yang)化(hua)(hua)鈣(gai)(gai)(gai)與(yu)一(yi)定質量的(de)(de)(de)水泥、沙石(shi)(shi)(shi)(shi)等混合(he)，然(ran)后被人們隨心所欲(yu)的(de)(de)(de)涂抹、構建(jian)成(cheng)(cheng)(cheng)各種風格、式樣的(de)(de)(de)房子(zi)，剛建(jian)成(cheng)(cheng)(cheng)的(de)(de)(de)房子(zi)的(de)(de)(de)墻皮較軟，等氫(qing)氧(yang)(yang)化(hua)(hua)鈣(gai)(gai)(gai)與(yu)空氣中的(de)(de)(de)二氧(yang)(yang)化(hua)(hua)碳(tan)完全發生(sheng)(sheng)(sheng)(sheng)化(hua)(hua)學(xue)反應(ying)生(sheng)(sheng)(sheng)(sheng)成(cheng)(cheng)(cheng)碳(tan)酸(suan)鈣(gai)(gai)(gai)和水時(shi)，才硬朗起(qi)來。
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