Bauxite Tailings To Activation Of The Preparation Of Low-temperature Ceramic Cementitious Materials

The bauxite gangue is one kind of waste that in the alumina produce process of bauxite beneficiation baier,and the process of bauxite beneficiation produces lots of gangue about 25% ～ 30% bauxite's weight.If these gangue cannot effective field treatment and make use of in time, large amount of land and good field will be occupyed, environment will be gravely polluted, ecological community will be destroyed.It's a significant environment question that the zhongzhou branch company urgently needs to solve.(1) According to gangue physical chemistry character analysis, gangue is one kind of the clay mineral without curing activity, SiO₂, Al₂O₃ contents among them are high,can be material to prepare low temperature ceramics cementitious material.Have provided a new way for bauxite gangue processing and the use.(2) The gangue preparation low temperature ceramics cementitious material premise is needs calcinations, causes the kaolin mineral which contains to transform as the metakaolin, suits uses the Na₂O-SiO₂ primarily stimulation material to carry on the active stimulation.(3) The experiment studies demonstrate that:The calcining heat has a more tremendous influence to the gangue activation, the best thermal energy activation condition is under 800℃ weak oxidized conditions calcinations for half hour.The better stimulation condition is Na₂O+SiO₂ is 7.03% of powder, Na₂O/SiO₂ is 2.180。(4) Inspected the reinforce effect of activity mineral:calcinations the kaolin to be able to cause the waterdemand to increase, the performance drops, the redmud and the cement has certainly reinforcing effect when lowly are mixing,the fly ash has reduce waterdemand and help powder rubs affect, the slag has the enhancement function,the fly ash, the slag, the cement coordination use, has the superimposition function.(5) KAl(SO₄)₂ and emulsion can reduce the material the water-absorptivity, enhances the stability.(6) The cementitious material has solidification speed excessively quickly problem,may choose the sodium carbonate , sodium sulfate , cane sugar , solubor and the humic acid sodium carries on slow congeals.(7) The low temperature ceramics cementitious material suited uses hot and damp maintains, solidifies the body compressive strength to achieve 74.2MPa, the anti-booklet intensity has achieved 11.8MPa.(8) The XRD diffraction and the SEM analysis may know, The low temperature ceramics cementitious material hydration product for theamorphous aluminosilicate gelatin, the substrate deals with the aggregate union to be close, is it has a better performance the main reason.(9) The compound material grows which to the low temperature ceramics cementitious material has carried on the economic analysis,finally indicated: This project investment profits and taxes rate are 40.19%, the investment recycling time is in 1.61 years, had the bettere conomic efficiency and stronger repays the strength, the profit and loss balance and the sensitive analysis indicated this project had the stronger anti-risk ability.