松桃地区电解锰渣制备烧结砖的实验研究

    Preparation of Sintered Brick from Electrolytic Manganese Residue in Songtao

    • 摘要: 针对松桃地区的电解锰渣,采用页岩、石灰石和粉煤灰协同电解锰渣制备烧结砖。以松桃地区富含的页岩和石灰石及电厂粉煤灰为配矿原料,协同电解锰渣进行了成型、预热、焙烧实验。结果表明,电解锰渣掺量可为50%~70%,其掺量过高或过低均降低坯块强度。烧制过程中可通过调整温度和时间,使得固体颗粒之间形成有效固相和液相黏结,避免坯块内部应力聚集形成裂纹降低强度。冷却时应避免急冷产生的不均匀收缩和低强度玻璃相。综合考虑推荐配比为电解锰渣∶页岩∶石灰石∶粉煤灰=6∶2∶1∶1,热工制度为预热温度500 ℃,时间30 min。焙烧温度1 000 ℃,时间120 min,随炉冷却,可得平均抗压强度28.84 MPa的焙烧坯块,达到了烧结普通砖MU25的强度指标,坯块浸出毒性也满足污水综合排放标准。该研究为松桃地区电解锰渣的无害化和资源化提供了新的技术思路。

       

      Abstract: Aiming at electrolytic manganese residue in Songtao, sintered bricks were prepared by using shale, limestone and fly ash in coordination with electrolytic manganese residue. With the shale and limestone which are rich in Songtao and the fly ash from the local power plant as ore blending materials in coordination with electrolytic manganese residue, the experiments of briquetting, preheating and roasting were carried out. The results show that the dosage of electrolytic manganese residue can be 50%~70%, and the briquet strength will be reduced when the dosage is too high or too low. In the firing process, the effective solid binding and liquid binding can be obtained, and the briquet cracks due to internal stress gathering can be avoided by adjusting the firing temperature and time. The uneven shrinkage and glass phase of low strength resulting from rapid cooling should be avoided during cooling down. The recommended ratio iselectrolytic manganese residue∶shale∶limestone∶fly ash= 6∶2∶1∶1, and the firing system is as follows: preheating temperature 500 ℃, preheating time 30 min, roasting temperature 1 000 ℃, roasting time 120 min, cooling down in a furnace. At this condition, the roasted briquets with the average strength of 28.84 MPa can be obtained, which reaches the MU25 strength index of common sintered brick, and its leaching toxicity also meets the comprehensive standards of sewage discharge. This study provides a new technical idea for the detoxification and recycle of electrolytic manganese residue in Songtao.

       

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