Abstract

In cementing operations, slag is gradually used as a mixture of cement materials, which can not only realize the reuse of resources, but also relieve the environmental pressure. In order to explore the fluid loss additive suitable for slag, a new type fluid loss additive AMPS/DMC/AA/DN-1 was prepared by molecular structure design and radical synthesis. The monomers used are 2-acrylamide-2-methyl-propionic acid (AMPS), dimethyl carbonate (DMC), acrylic (AA), unsaturated tertiary amine organic solvent (DN-1). The molecular structure and temperature resistance of the copolymer were characterized by elemental analysis, XPS, infrared spectroscopy, thermal weight loss, and nuclear magnetic resonance hydrogen spectroscopy, and performance evaluation was performed on the titanium-bearing titanium slag doped with AMPS/DMC/AA/DN-1. The results show that when the amount of AMPS/DMC/AA/DN-1 is 2%, the water loss of chlorination titanium blast furnace slag is 24.25 mL, which has good water loss reduction. And the compressive strength of chlorination titanium blast furnace slag is 11.19 MPa, which meets the cementing requirement. In addition, the density of chlorination titanium blast furnace slag is within the range of 1.6–1.9 g/cm³, AMPS/DMC/AA/DN-1 can make the water loss within 50 mL; and it can reduce the water loss in the range of 30 °C–90 °C. Besides, AMPS/DMC/AA/DN-1 can significantly improve the rheological properties and settlement stability of titanium slag.

摘要

在固井作业中，矿渣逐渐被用作水泥材料的混合物，既可以实现资源的再利用，又可以缓解环境压力。为探索适用于矿渣的降滤失剂，通过分子结构设计和自由基合成制备了新型降滤失剂AMPS/DMC/AA/DN-1。所用单体为2-丙烯酰胺-2-甲基-丙酸（AMPS）、碳酸二甲酯（DMC）、丙烯酸（AA）、不饱和叔胺有机溶剂（DN-1）。通过元素分析、XPS、红外光谱、热失重、核磁共振氢谱对共聚物的分子结构和耐温性进行表征，并对掺杂AMPS/DMC/AA的含钛钛渣进行性能评价/DN-1。结果表明，当AMPS/DMC/AA/DN-1的用量为2%时，氯化钛高炉渣的失水量为24.25 mL，具有较好的降失水效果。氯化钛高炉渣抗压强度为11.19 MPa，满足固井要求。此外，氯化钛高炉渣的密度在1.6-1.9 g/cm³、AMPS/DMC/AA/DN-1可使失水量在50mL以内；在30°C-90°C范围内可减少失水。此外，AMPS/DMC/AA/DN-1可以显着提高钛渣的流变性能和沉降稳定性。