用磷石膏烧成硫铝酸盐水泥的研究

Study of using phosphogypsum for sintering sulpho-aluminate cement

讨论了在还原气氛下，用磷石膏烧成硫铝酸盐水泥的可行性。结果表明，在弱还原气氛下，可以烧成强度较高（３ｄ抗压强度６４.７ＭＰａ）、凝结时间正常的熟料（初凝时间３７ｍｉｎ）；在还原气氛较浓的情况下，含杂质较高的磷石膏大量分解，熟料偏离正常矿物组成，生成Ｃ１２Ａ７和还原性矿物ＣａＳ，急凝低强。

The feasibility of using phosphogypsum under reducing atmosphere for sintering sulpho-aluminate cement wasdiscussed. The result shows, under the weak reducing atmosphere condition, the normal clinker can be produced with higherstrength (3d compressive strength 64. 7 MPa) and setting time meet the standard (initial setting time 37 min); under thecondition of relatively concentrated reducing atmosphere, the more impurities phosphogypsum decomposed with a largequantity, the mineral composition of clinker were biased from the normal case. producing C12A7 and reducing mineral CaS,quick setting and low strength.