Pumpable coal mine goaf backfilling material

• Main Authors: LIU ZHIHUA, LI YUANFENG
• Format: Patent
• Language: English
• Published: 29.04.2015
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SLAG; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF NATURAL STONE

The invention provides a pumpable coal mine goaf backfilling material which comprises the following raw materials in percentage by mass: 10-15% of cement, 10-20% of fly ash, 65-80% of coal gangue powder, 1-1.5% of water reducing agent, 0.5-1% of plastic stabilizer and 0.1-0.5% of retarder (the water reducing agent, plastic stabilizer and retarder are mass percents in cement). The water-solid ratio of the pumpable coal mine goaf backfilling material is 0.65-0.8. The invention also provides a method for preparing the pumpable coal mine goaf backfilling material, which comprises the following steps: proportionally weighing and uniformly mixing the cement, fly ash and coal gangue powder according to the formula, adding a certain amount of water in which the water reducing agent, plastic stabilizer and retarder are dissolved, and stirring to prepare the uniform slurry, thereby obtaining the pumpable coal mine goaf backfilling material.