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Iron tailings based geopolymer porous material and preparation method thereof

A technology of geopolymers and porous materials, applied in the field of new green inorganic gel materials, can solve the problems of reducing gel phase, unfavorable polycondensation reaction, difficult dissolution, etc., and achieves the effects of low cost, easy acquisition of raw materials and solving ecological problems.

Pending Publication Date: 2019-04-05
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also successful preparations of geopolymers using aluminum ash, silica fume, calcium tailings, volcanic ash, shale, red mud, sludge, rice husk ash and straw ash as solid raw materials, but the materials with low activity contain minerals The components are mostly combined in the form of crystals, and it is difficult to dissolve Si and Al under the action of the activator, which is not conducive to the subsequent polycondensation reaction and reduces the formation of the gel phase.
In the prior art, there is a method for preparing ceramsite by selecting other materials as main raw materials and iron tailings as admixture materials, but there is no method for preparing geopolymers with a large amount of stockpiled iron tailings as main raw materials.

Method used

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  • Iron tailings based geopolymer porous material and preparation method thereof
  • Iron tailings based geopolymer porous material and preparation method thereof
  • Iron tailings based geopolymer porous material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Preparation of solid raw materials: take iron tailings, dry them in a drying oven at 105°C for 3 hours, grind them after dehydration, and sieve them with a 200-mesh sieve. More than 98% of the particles have a particle size of ≤50 μm. Take iron kaolin, calcinate it in a resistance furnace at 800°C for 2 hours, and cool it to get metakaolin for use. According to SiO 2 / Al2O 3 The molar ratio is 2.8, take 169.08g of iron tailings, 30.92g of metakaolin, and a total mass of 200g, and mix them uniformly to obtain solid raw materials.

[0043] Preparation of compound base activator: according to SiO 2 / Na 2 The mol ratio of O is the proportioning of 1.6, gets solid sodium hydroxide 16.93g, water glass 126.86g, mixes. and follow H 2 O / Na 2 Add 33.27g of deionized water and stir evenly to obtain a composite base activator when the molar ratio of O is 9.

[0044] Slurry preparation: solid raw materials and compound base activator according to Na 2 O / Al 2 o 3 When the m...

Embodiment 2

[0050] Preparation of solid raw materials: take the iron tailings, dry them in a drying oven at 115° C. for 2 hours, grind them after dehydration, and sieve them with a 150-mesh sieve. The particles with a particle size of ≤50 μm account for more than 74%. The iron kaolin was taken, calcined in a resistance furnace at 700°C for 6 hours, and cooled to obtain metakaolin for use. According to SiO 2 / Al 2 o 3 The molar ratio is 3.3, take 112.56g of iron tailings, 87.44g of metakaolin, and a total mass of 200g, and mix them to obtain solid raw materials.

[0051] Preparation of compound base activator: according to SiO 2 / Na 2 The mol ratio of O is the proportioning of 1.4, gets solid sodium hydroxide 15.23g, water glass 83.96g, mixes. According to H 2 O / Na 2 Add 30.72g of deionized water and stir evenly to obtain a composite alkali activator when the molar ratio of O is 10.

[0052] Slurry preparation: solid raw materials and compound base activator according to Na 2 O / Al...

Embodiment 3

[0058] Preparation of solid raw materials: take the iron tailings, dry them in a drying oven at 110° C. for 2 hours, grind them after dehydration, and sieve them with a 200-mesh sieve. More than 98% of the particles have a particle size of ≤50 μm. The iron kaolin was taken, calcined in a resistance furnace at 750°C for 4 hours, and cooled to obtain metakaolin for use. According to SiO 2 / Al 2 o 3 The molar ratio is 3.0, take 143.62g of iron tailings, 56.38g of metakaolin, and a total mass of 200g, and mix them to obtain a composite alkali activator.

[0059] Preparation of compound base activator: according to SiO 2 / Na 2 The mol ratio of O is the proportioning of 1.6, gets solid sodium hydroxide 15.50g, water glass 116.17g, mixes. According to H 2 O / Na 2 Add 30.46g of deionized water to a molar ratio of 11, and stir to obtain a composite alkali activator.

[0060] Slurry preparation: solid raw materials and compound base activator according to Na 2 O / Al 2 o 3 When ...

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Abstract

The invention relates to an iron tailings based geopolymer porous material and a preparation method thereof. The preparation method includes, grinding and activating iron tailings, which serve as themain raw material, adding in a certain proportion of Kaolin to regulate components, uniformly mixing with sodium hydroxide and a sodium silicate composite alkali activator to obtain a mixture, injecting the mixture into a mold while sealing and curing, releasing, and maintaining on the condition with a certain temperature and humidity, so as to obtain a finished product. The geopolymer porous material has the special three-dimensional grid structure with high strength, large specific surface ratio, good corrosion resistance and long durability, and can be applied to the fields such as buildingmaterials, sealing of heavy-metal ion or toxic waste, porous adsorbent materials and the like. Raw materials are rich in sources and cost is low; the preparation method is simple, green and environmental friendly, realizes recycled comprehensive utilization of iron tailings, and has a great significance in sustainable development and energy conservation and emission reduction.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of mineral resources and novel green inorganic gel materials, in particular to a geopolymer porous material based on iron tailings and a preparation method thereof. Background technique [0002] Iron tailings are wastes discharged after iron ore is selected from iron ore concentrate. With the extensive mining of mineral resources for many years, the comprehensive utilization rate of tailings is low, and its accumulation is increasing year by year. A large number of accumulated tailings not only occupy arable land , and cause surrounding environmental pollution. In addition, the construction and maintenance of tailings dams also increase the operating costs of iron and steel enterprises. Geopolymer (Geopolymer) is a kind of [SiO 4 ] 4- and [AlO 4 ] 5- It is an amorphous or quasi-crystalline inorganic gel material that is polymerized from the main structural unit. Due to its special thr...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B38/00
CPCC04B28/006C04B18/12C04B14/106C04B12/04C04B22/062C04B38/00Y02P40/10
Inventor 汪应玲罗绍华赵鑫赵宇轩刘洲林刘承军姜茂发
Owner 东北大学秦皇岛分校
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