Red mud geopolymer self-leveling mortar for mine filling

Abstract

The invention belongs to the field of building materials, and discloses red mud geopolymer self-leveling mortar for mine filling. The red mud geopolymer self-leveling mortar for mine filling is prepared from the following ingredients in percentage by weight: 25 to 45 parts of superfine slag powder, 0 to 6 parts of aluminum sulfate, 5 to 8 parts of sintered desulfurized ash, 10 to 18 parts of red mud, 35 to 43 parts of tailing sand, 0.05 to 0.15 part of efficient water reducing agents, 0.1 to 0.25 part of sodium dodecyl benzene sulfonate and 1 to 3 parts of emulsion powder or rubber powder. Thehigh alkalinity and gelling property of the red mud are utilized; the red mud is matched with industrial waste materials such as the superfine slag powder and the sintered desulfurized ash to be used; the defects of low drying shrinkage, insufficient intensity and the like of the existing self-leveling mortar can be made up; the preparation cost of the self-leveling mortar can be effectively reduced; the accumulation pressure of the red mud and tailing sand can be relieved; ecological environmental protection and obvious economic benefits are realized.

Description

Technical field [0001] The invention belongs to the field of green building materials, and particularly relates to a red mud geopolymer self-leveling mortar material used for mine backfilling. Background technique [0002] Red mud is the waste residue discharged from the alumina production process, and its mineral composition mainly consists of Al 2 O 3 , Na 2 O, SiO 2 , CaO, Fe 2 O 3 , TiO 2 Wait. The main harmful component of red mud is Na 2 The attached solution of O, the attached solution contains 2~3g / L of alkali, the pH value is between 12.2~13.0, and the attached solution of red mud contains Al 2 O 3 , Na 2 O, SiO 2 , CO 2 , NaCl, H 2 O etc. According to previous studies, iron-bearing minerals change with alumina, and the ratio of goethite and hematite also changes. The hematite content of the sample mineral composition fluctuates between 20%-40%, and the content of goethite fluctuates between 18-27%. Goethite is cryptocrystalline or microcrystalline, which is mostly ceme...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a red mud geopolymer self-leveling mortar for backfilling mines in order to solve the above technical problems. A large amount of red mud is used in the self-leveling mortar, which can make up for the dry shrinkage and low strength of the existing mortar At the same time, it can reduce the cost of self-leveling mortar products and relieve the pressure of red mud accumulation and environmental pollution.

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