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Method for preparing geopolymer gelled material from heavy metal gypsum

A geopolymer and cementitious material technology, applied in the fields of environmental protection and material engineering, can solve problems such as calcium sulfate heavy metal pollution, and achieve the effect of high compressive strength and increased compressive strength

Inactive Publication Date: 2014-03-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method uses waste to treat waste, the process is simple, and the cost is low, which solves the problems of calcium sulfate recycling and heavy metal pollution, and at the same time eases the storage of industrial waste residues such as fly ash, coal gangue, slag and steel slag.

Method used

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  • Method for preparing geopolymer gelled material from heavy metal gypsum
  • Method for preparing geopolymer gelled material from heavy metal gypsum
  • Method for preparing geopolymer gelled material from heavy metal gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Configure activator solution with NaOH, water glass and water, mix and stir to obtain alkaline activator solution, age for 24h, the total solid content in the activator solution is 33.00wt% and the modulus is 1.10; fly ash , coal gangue, and heavy metal gypsum are respectively ball milled to a volume median diameter of 100±10 μm, mixed and stirred evenly to obtain solid raw materials, the solid raw materials contain 60.00wt% of fly ash, 20.00wt% of coal gangue, and 20.00wt% of heavy metal gypsum; The aged alkaline activator solution was mixed with solid raw materials and stirred for 10 minutes to obtain a geopolymer slurry, which was transferred to a mold for molding and sealed and maintained at room temperature for 24 hours before demolding, wherein the alkaline activator solution was mixed with The mass ratio of solid raw materials is 0.55; the geopolymer after demoulding is cured under high temperature conditions for 48 hours, and the curing temperature is 85°C; the g...

Embodiment 2

[0021]Configure the activator solution with NaOH, KOH, water glass, water, mix and stir to obtain an alkaline activator solution, age for 48h, and the total solid content in the activator solution is 36.00wt% and the modulus is 1.20; Fly ash and heavy metal gypsum were respectively ball milled until the volume median diameter was 80±10 μm, mixed and stirred evenly to obtain solid raw materials, which contained 80.00wt% of fly ash and 20.00wt% of heavy metal gypsum; the aged alkali The alkaline activator solution was mixed with the solid raw material and stirred for 10 minutes to obtain a geopolymer slurry, which was transferred to a mold for molding, sealed and maintained at room temperature for 12 hours, and then released from the mold. The mass ratio of the alkaline activator solution to the solid raw material was 0.40; the geopolymer after demoulding was cured under high temperature conditions for 18 hours, and the curing temperature was 80°C; the geopolymer after high-tempe...

Embodiment 3

[0023] Configure activator solution with NaOH, water glass and water, mix and stir to obtain alkaline activator solution, age for 24h, the total solid content in the activator solution is 39.00wt% and the modulus is 1.00; fly ash, The heavy metal gypsum is respectively ball-milled to a volume median diameter of 60±10 μm, mixed and stirred evenly to obtain a solid raw material, the solid raw material contains 85.00wt% of fly ash and 15.00wt% of heavy metal gypsum; the alkaline activator solution after aging Mix with solid raw materials and stir for 10 minutes to obtain geopolymer slurry, which is transferred to a mold for molding and airtight curing at room temperature for 20 hours before demoulding, wherein the mass ratio of alkaline activator solution to solid raw materials is 0.45; The demoulded geopolymer was cured under high temperature conditions for 24 hours, and the curing temperature was 90°C; the geopolymer after high-temperature airtight curing was placed in the air u...

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Abstract

The invention relates to a method for preparing a geopolymer gelled material from heavy metal gypsum, belonging to the field of environmental protection and material engineering. According to the method, heavy metal gypsum is adopted as a main calcium source, silicon sources and aluminum sources including fly ash, coal gangues, mineral waste residues, steel slag and the like are added to prepare geopolymer slurry under the action of an alkaline excitant solution, and then the geopolymer gelled material is prepared through the processes of molding, normal temperature sealed maintenance, high-temperature sealed maintenance and the like. The 28d compression strength of the geopolymer gelled material prepared by the method disclosed by the invention can reach 48MPa, and the heavy metal leaching concentration limiting value of a finished product is lower than a national standard. The geopolymer gelled material can be used as a building material, such as replacing a natural aggregate in concrete or serving as a roadbed aggregate. The method achieves treatment of wastes with processes of wastes against one another and is simple in process and low in cost, so that the problems of recycling of calcium sulfate and heavy metal pollution are solved, and the stockpiling problem of industrial residues including the fly ash, coal gangues, mineral waste residues, steel slag and the like is solved at the same time.

Description

technical field [0001] The invention relates to a method for preparing geological polymer gelling materials from heavy metal gypsum, which belongs to the field of environmental protection and material engineering. It is suitable for the treatment of heavy metal-containing waste gypsum produced in the smelting process of black and non-ferrous metals (such as the polluted acid slag produced in the smelting process of lead and zinc). This invention uses heavy metal gypsum as the calcium source of geopolymers to prepare geopolymer cementitious materials , the prepared geopolymer cementitious material can be used as building materials, for example, in concrete to replace natural aggregates or as roadbed aggregates. Background technique [0002] Heavy metal waste gypsum is the product of neutralization of dirty acid and lime milk or calcium oxide produced in the smelting process of ferrous and nonferrous metals. According to the test, the content of calcium sulfate in heavy metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26
Inventor 潘德安张深根郭斌李灵洁田建军
Owner UNIV OF SCI & TECH BEIJING
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