CAJ | 학술논문

研究了矿化剂对中低品位铝矾土对所制备铝酸钙粉的结构及其光谱性能的影响。以中低品位铝钒土和碳酸钙为主要原料，矿化剂CaF2为添加剂，三者经充分混合、高温煅烧和粉磨后，生产出的铝酸钙粉可直接用于制备聚合氯化铝、聚合硫酸铝、铝酸钠等水处理剂。通过调整原料中铝矾土和碳酸钙的质量比和矿化剂CaF2投加量的方法优化铝酸钙粉的制备工艺，采用红外光谱分析对铝酸钙粉和铝矾土进行表征，并对矿化剂的矿化机理进行研究。红外光谱分析结果表明：加入矿化剂CaF2，可促进铝矾土中硬水铝石、三水铝石和高岭石的分解转化，使碳酸钙的分解完全，使原料中的铝矾土与碳酸钙进行更加充分的反应，不仅有助于碳酸钙中的Ca与铝矾土中的Si结合，还有助于促进铝矾土中的Si—O ，Si—O—Al及 Al—Si键的断裂，使铝矾土中的Al充分溶出，从而提高Al2 O3的溶出率；矿化剂CaF2的投加量（质量比）为3％时，可有效促进Al2 O3的溶出；矿化剂CaF2的投加量为1.5％时，不足以起到充分的矿化作用；中低品位铝矾土较高品位铝矾土更易于烧结制备铝酸钙粉；在1250℃下制备铝酸钙粉的最佳物料配比是：原料中铝矾土与碳酸钙的质量比为1∶0.6，矿化剂CaF2的投加量为3％。
연구료광화제대중저품위려반토대소제비려산개분적결구급기광보성능적영향。이중저품위려범토화탄산개위주요원료，광화제CaF2위첨가제，삼자경충분혼합、고온단소화분마후，생산출적려산개분가직접용우제비취합록화려、취합류산려、려산납등수처리제。통과조정원료중려반토화탄산개적질량비화광화제CaF2투가량적방법우화려산개분적제비공예，채용홍외광보분석대려산개분화려반토진행표정，병대광화제적광화궤리진행연구。홍외광보분석결과표명：가입광화제CaF2，가촉진려반토중경수려석、삼수려석화고령석적분해전화，사탄산개적분해완전，사원료중적려반토여탄산개진행경가충분적반응，불부유조우탄산개중적Ca여려반토중적Si결합，환유조우촉진려반토중적Si—O ，Si—O—Al급 Al—Si건적단렬，사려반토중적Al충분용출，종이제고Al2 O3적용출솔；광화제CaF2적투가량（질량비）위3％시，가유효촉진Al2 O3적용출；광화제CaF2적투가량위1.5％시，불족이기도충분적광화작용；중저품위려반토교고품위려반토경역우소결제비려산개분；재1250℃하제비려산개분적최가물료배비시：원료중려반토여탄산개적질량비위1∶0.6，광화제CaF2적투가량위3％。
In this study ,effect of mineralizer on the structure and spectraproperties of calcium aluminates formation was exten-sively studied .Medium or low-grade bauxite and calcium carbonate were used as raw material and mineralizer CaF2 as additive . Calcium aluminates can be obtained after mixing fully ,calcination and grinding .The prepared calcium aluminates can be directly used for the production of polyaluminiumchloride (PAC) ,polymeric aluminum sulfate ,sodium aluminate and some other water treatment agents .The calcium aluminates preparation technology was optimized by investigating the mass ratio of raw materials (bauxiteand calcium carbonate) and mineralizer CaF2 dosage .T he structure and spectra properties of bauxite and calcium alumi-nates were characterized by Fourier transform infrared(FTIR) spectroscopy analysis and the mineralization mechanism of the mineralizer was studied .FTIR spectra indicated that the addition of mineralizer promoted the decomposition and transformation of the diaspore ,gibbsite and kaolinite ,the decomposition of calcium carbonate ,and more adequately reaction between bauxite and calcium carbonate .In addition ,not only Ca in calcium carbonate and Si in bauxite were more readily reacted ,but also Si—O , Si—O—Al and Al—Si bonds in the bauxite were more fractured which contributed to the release of Al in bauxite ,and therefore , the dissolution rate of Al2O3 could be improved .The dissolution rate of Al2O3 can be promoted effectively when the mineralizer CaF2 was added in a mass ratio amount of 3% .And the mineralizer CaF2 cannot be fully functioned when its dosage was in a mass percent of 1.5% .Low-grade bauxite was easier to sinter for the preparation of calcium aluminates comparing with the high-grade one .The optimum material ratio for the preparation of calcium aluminates calcium at 1 250 ℃ was :the mass ratio between bauxite and calcium carbonate of 1∶0.6 and mineralizer CaF2 mass ratio percent of 3% .