Method for preparing geopolymer from stone coal vanadium extraction acid-leaching residues

Abstract

The invention discloses a method for preparing a geopolymer from stone coal vanadium extraction acid-leaching residues. The method comprises steps as follows: grinding balls and the stone coal vanadium extraction acid-leaching residues are added to a stirring mill, water is used as an ore grinding medium, ore pulp is taken out after stirring activation is performed for 0.5-4 h, and activated residues are prepared after filtration and drying; the activated residues are evenly mixed with an activating agent, metakaolin and filler, and a mixture is obtained; an liquid alkali activator is added to the mixture with the mass ratio of the liquid alkali activator to the mixture being 0.7-1.4 and evenly mixed, and mixed mortar is prepared; the mixed mortar is poured into a mold, and a sample is obtained after vibration molding; the sample is sealed for maintenance at 30-80 DEG C for 3-12 h, demolded and left to stand at the room temperature for 1-4 d, and the geopolymer is obtained. The stone coal vanadium extraction acid-leaching residue activation process is simple, low in alkali consumption, low in cost and environment-friendly, the activity of tailings is high, and the prepared geopolymer is high in early compressive strength, high in sulfate corrosion resistance and high in thermal stability.

Description

technical field [0001] The invention belongs to the field of geopolymer technology. In particular, it relates to a method for preparing geopolymer by using vanadic acid leaching slag extracted from stone coal. Background technique [0002] Geopolymer is a new type of high-performance inorganic polymer gelling material. This kind of material is made of aluminosilicate material, excited under strong alkali conditions and low temperature conditions (30-180 ° C), through chemical A new material obtained by the reaction, its high-temperature performance and mechanical performance are obviously higher than those of polymer materials, cement, ceramics and metal materials. Compared with traditional cement, it has the advantages of "energy saving" and "low exhaust emission", and has wide application prospects in green and environmental protection industries. The traditional raw materials for the preparation of geopolymers are aluminosilicate materials such as metakaolin or fly ash ...

AI Technical Summary

Problems solved by technology

[0005] Literature (Jiao Xiangke et al. Activation of low-activity high-silicon tailings and its activity evaluation in mineral polymerization[J]. Silicate Bulletin, 2015,24(1):112-119) Extraction of vanadium from stone coal The water leaching slag is used as the main raw material to prepare geopolymers. The water leaching slag of vanadium extraction from stone coal is activated by wet method adding alkali calcination, dry method adding alkali calcination and dry method ball milling respectively to obtain activated slag. Alkali calcination has the best effect, and the leaching concentration of active (Si+Al) in the tailings is about 1800mg / L. This activation method is complex in process, and the high amount of alkali leads to high cost. At the same time, there is the problem of calcination polluting the environment.

Chinese patent CN103482890B discloses a method for preparing geopolymers with vanadium extraction tailings from stone coal as the main raw material. Calcium hydroxide and sodium sulfate are added to the leaching residue as activators, and the tailings are calcined and activated to prepare geopolymers. This activation method also has the problem of calcination polluting the environment, and the anti-sulfur acid resistance of the prepared geopolymers has not been investigated. Salt attack ability and thermal stability

[0006] Aiming at the characteristics of vanadic acid leaching slag from stone coal extraction and the problems of complex process, high alkali consumption, heavy pollution, low activity of tailings and single performance inspection index of geopolymer in existing activation methods, it is necessary to find a simple process, A method for preparing geopolymers from vanadium leaching slag extracted from stone coal with low alkali consumption, low cost, low pollution, and high activity of tailings