Method for preparing geopolymer finished product by using typical rare earth tailings in western Sichuan

Abstract

The present invention is a method for preparing geopolymer finished products using typical rare earth tailings in western Sichuan, and solves the problem of low strength of rare earth tailings for preparing geopolymer finished products. Silica fume 5-50, NaOH 28-40, water 60-138, heavy metal source (lead salt Pb(NO 3 ) 2 ) 0.1-5. The preparation method is as follows: roast kaolin at 800 °C for 6 h to obtain metakaolin of the same quality, dissolve NaOH in water, add silica fume and stir until the silica fume dissolves, and simultaneously add Pb(NO 3 ) 2 , when the temperature drops to 30°C~80°C, add metakaolin and rare earth tailings and stir together, pour the mixed slurry into a mold to form, and the 7d compressive strength of the prepared geopolymer can reach 36MPa. Pb in leach solution 2+ The concentrations are all lower than the limit value of the national standard: total Pb<5 mg / L.

Description

technical field [0001] The invention relates to the preparation of geopolymer by using rare earth tailings and the method for solidifying heavy metal pollutants by geopolymer. Background technique [0002] In recent years, the rare earth resource development and utilization industry has grown rapidly, and resources have been exploited in large quantities. Due to factors such as long-term disorder and random stacking of tailings, serious geological hazards, environmental pollution and other mine geological environmental problems have been caused. The Maoniuping rare earth ore concentration area in western Sichuan accounts for 90% of the province's rare earth resources and is the second largest rare earth raw material base in the country. At the same time, it is located in an area with a high incidence of geological disasters, so the problem is particularly prominent. [0003] According to public information [1-4] , only in 2012, Mianning Maoniuping mining area identified [3...

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Problems solved by technology

[0005] Some domestic scholars have carried out research on the preparation of geopolymers from high-alumina and high-silicon tailings and solid waste and the solidification of heavy metals in geopolymers [13] , but there are few studies on the use of rare earth tailings for the preparation of geopolymers and solidification of heavy metals for mine geological disaster control and pollution source solidification

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