Method for preparing geopolymer by using oxidized gold ore heap leaching tailings

A geopolymer, oxidative technology, applied in the field of waste resource utilization, can solve the problems of no recycling, no treatment method, waste of resources, etc., and achieve the effects of fast hardening, easy operation and high molding strength

Inactive Publication Date: 2019-03-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, most of the cyanide tailings in China are not recycled because there is no mature treatment method, but are piled up by enterprises or used as underground filling materials, resulting in a waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The oxidized gold mine heap leaching tailings described in this embodiment is a cyanidation heap leaching tailings of a gold mine in Yunnan, containing SiO 2 15.34%, Al 2 o 3 6.17%, grind the heap leaching tailings until the particle size is less than 2mm, dry until the water content is less than 5%, and set aside.

[0022] Take 300g of cyanidation heap leaching tailings and 150g of kaolin from a gold mine in Yunnan, mix them evenly, put them into a muffle furnace, heat them to 800°C and keep them warm for 2 hours for calcination to obtain a mixture of calcined cyanide heap leaching tailings and metakaolin; weigh Add 50g of the calcined product to the prepared 20ml alkali activator solution (the concentration of sodium hydroxide in the alkali activator solution is 10mol / L, the modulus of sodium silicate is 3, and the concentration is 1.4mol / L), and stir evenly After that, it was injected into the mold, oscillated to discharge the air in the reactant, and left to stand...

Embodiment 2

[0024] The oxidized gold mine heap leaching tailings described in this embodiment is the cyanidation heap leaching tailings of a gold mine in Yunnan, containing SiO 2 15.34%, Al 2 o 3 6.17%, grind the heap leaching tailings until the particle size is less than 2mm, dry until the water content is less than 5%, and set aside.

[0025] Take 300g of cyanidation heap leaching tailings and 200g of kaolin from a gold mine in Yunnan, mix them uniformly, put them into a muffle furnace, heat them to 300°C and keep them for 2 hours for calcination to obtain a mixture of calcined cyanidation heap leaching tailings and metakaolin. Weigh 50g of the calcined product and add it to the prepared 20ml alkali activator solution (the concentration of sodium hydroxide in the alkali activator solution is 10mol / L, the modulus of sodium silicate is 2, and the concentration is 1.4mol / L), Stir evenly and pour into the mold, oscillate to discharge the air in the reactant, let it stand at room temperatu...

Embodiment 3

[0027] The oxidized gold mine heap leaching tailings described in this embodiment is the cyanidation heap leaching tailings of a gold mine in Yunnan, containing SiO 2 15.34%, Al 2 o 3 6.17%, grind the heap leaching tailings until the particle size is less than 2mm, dry until the water content is less than 5%, and set aside.

[0028] Take 300g of cyanidation heap leaching tailings and 100g of kaolin from a gold mine in Yunnan, mix them evenly, put them into a muffle furnace, heat them to 900°C and keep them for 2 hours for calcination to obtain a mixture of calcined cyanide heap leaching tailings and metakaolin. Weigh 50g of the calcined product and add it to the prepared 15ml alkali activator solution (the concentration of sodium hydroxide in the alkali activator solution is 12mol / L, the modulus of sodium silicate is 3, and the concentration is 1.7mol / L), Stir evenly and pour into the mold, oscillate to discharge the air in the reactant, let it stand at room temperature for ...

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Abstract

The invention discloses a method for preparing a geopolymer by using oxidized gold ore heap leaching tailings, belonging to the technical field of waste resource utilization. The method comprises thesteps of taking the oxidized gold ore heap leaching tailings for fine grinding and drying, mixing the product with kaolin and heating up to 300-900 DEG C for carrying out calcination, adding the calcined product into an alkali activator solution prepared from sodium hydroxide and sodium silicate, stirring, injecting into a mould and standing for 16-24h, and solidifying to obtain the product. The geopolymer gel material prepared by the method has the advantages of being fast in hardening and high in molding strength, and not needing high-temperature curing in a molding process, and can reach acertain strength in a short time; furthermore, the geopolymer gel material prepared by the method can effectively solidify and encapsulate heavy metals and toxic and harmful ions contained in cyanidation leaching tailings, thus preventing the heavy metals and the toxic and harmful ions from leaching and further avoiding environmental damage.

Description

technical field [0001] The invention relates to a method for preparing geopolymers by using oxidized gold ore heap leaching tailings, and belongs to the technical field of waste resource utilization. Background technique [0002] Geopolymer (Geopolymer) is one of the non-metallic materials that has been studied very actively in the world in recent years. It is a new type of inorganic polymer material obtained by chemical reaction at relatively low temperature with clay, industrial waste residue or slag as the main raw material and alkali as the activator. This material is newly developed in recent years, it is possible to replace cement in many occasions, and it is a new material with better performance than cement. Geopolymers have unique properties superior to ordinary Portland cement, such as high strength, fast hardening, and acid and alkali corrosion resistance. At the same time, they have the advantages of abundant materials, low prices, and energy saving, which has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24
CPCC04B7/243C04B12/005Y02P40/10
Inventor 谢贤康博文陈水奇宋强赵楚范培强许乌鹏
Owner KUNMING UNIV OF SCI & TECH
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