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Synthetic method of geopolymer

A technology of geopolymers and synthesis methods, applied in the field of synthesis of inorganic polymer materials, can solve the problems of high cost, environmental pollution, waste of resources, etc., and achieve the effects of high quality, environmental protection, and easy operation

Active Publication Date: 2014-06-18
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, in aluminum processing enterprises, the treatment of invalid polishing liquid was generally discharged by adding lime to neutralize the acid, which cost a lot of money, not only wasted resources, but also seriously polluted the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 2000g of kaolin into a muffle furnace, heat it to 400°C and keep it for 2 hours, and get metakaolin after cooling. Weigh 1000g of metakaolin, add 700g of invalid phosphoric acid-based polishing solution containing 65% phosphoric acid, 12% sulfuric acid, 2% nitric acid and 15g of deionized water, stir well and pour into the mold, keep the temperature at 30°C for reaction, the reaction time After 6 days, the demoulding was carried out after the reaction. At this time, the compressive strength was measured to be about 20MPa. The demoulded material was placed in a sealed bag at room temperature, taken out after 28 days, and measured again. The material is a high-strength synthetic geopolymer material with a compressive strength of 49MPa. Example 2

Embodiment 2

[0022] Put 2500g of kaolin into a muffle furnace, heat it to 650°C and keep it for 1.5h, and obtain metakaolin after cooling. Weigh 1200g of metakaolin, add 870g of invalid phosphoric acid-based polishing solution containing 75% phosphoric acid, 8% sulfuric acid, 5% nitric acid and 27g of deionized water, stir well and pour into the mold, keep the temperature at 55°C for reaction, the reaction time After 4 days, the demoulding was carried out after the reaction. At this time, the compressive strength was measured to be about 25MPa. The material after demoulding was placed in a sealed bag at room temperature, taken out after 35 days, and measured again. The material is a high-strength synthetic geopolymer material with a compressive strength of 51MPa. Example 3

Embodiment 3

[0023] Put 2000g of kaolin into a muffle furnace, heat it to 800°C and keep it for 1 hour, and obtain metakaolin after cooling. Weigh 1000g of metakaolin, add 700g of invalid phosphoric acid-based polishing solution containing 70% phosphoric acid, 10% sulfuric acid, 3% nitric acid, and 20g of deionized water, stir evenly, inject into the mold, and keep the temperature at 60°C for reaction. The time is 5 days. After the reaction is finished, the demoulding is carried out. At this time, the compressive strength is measured to be about 24MPa. The material after demoulding is placed in a sealed bag and placed in a room temperature environment. After 30 days, it is taken out, and the obtained geological composition is measured again. The polymer is a high-strength synthetic geopolymer material with a compressive strength of 55MPa. Example 4

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Abstract

The invention discloses a synthetic method of geopolymer. Metakaolin is taken and added into expired phosphate group polishing liquor for being mixed for reacting, and a product is obtained after the reaction is ended. The applied expired phosphate group polishing liquor accounts for 70%-75% of the weight of metakaolin, wherein the expired phosphate group polishing liquor comprises the following vital components: 65%-75% of phosphoric acid, 8%-12% of sulfuric acid and 2%-5% of nitric acid. An excitant for the synthetic method is acidy, so that the synthesized geopolymer can be prevented from generating alkali-aggregate reaction, and the synthesized product is good in performance and excellent in quality; furthermore, the expired phosphate group polishing liquor is applied as the excitant for synthesizing the geopolymer to realize the recycling of wastes, so that not only is environment protected, but also cost of producing the geopolymer material is obviously lowered; moreover, the synthetic method disclosed by the invention is easy to operate, and concise in technological process.

Description

technical field [0001] The invention relates to a method for synthesizing inorganic polymer materials, in particular to a method for synthesizing geopolymers. 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 a relatively low temperature with clay, industrial waste residue or slag as the main raw material, alkali or acid as the activator, and appropriate process treatment. 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 ...

Claims

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Application Information

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IPC IPC(8): C04B7/345C04B7/36
CPCY02P40/10
Inventor 郭昌明刘梦怡黎铉海
Owner GUANGXI UNIV
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