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Foaming ceramic based on phosphate tailings and coal gangue and preparation method thereof

A technology of foamed ceramics and coal gangue, which is applied in the field of phosphorus tailings and coal gangue resource utilization, can solve the problems of large influence on the quality stability of porous ceramics, increase the difficulty of pore regulation, increase the complexity of the process, etc., and achieve low cost , low production cost, and the effect of reducing liquid viscosity and surface tension

Pending Publication Date: 2022-04-29
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The porous ceramics prepared by this method need to add a variety of components, which increases the complexity of the process and the preparation cost, and the quality stability of the prepared porous ceramics is greatly affected by the admixture
[0007] Due to the addition of foaming agent, fluxing agent and foam stabilizer and other components in the existing foamed ceramics, the complexity of the process is increased, and the difficulty of porosity regulation is increased.
Some pore-forming agents will pollute the environment when they are used, for example, gas will be emitted when the organic pore-forming agents are burned out; and there is no public report on the technology of preparing foamed ceramics using the synergistic effect of phosphorus tailings and coal gangue

Method used

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  • Foaming ceramic based on phosphate tailings and coal gangue and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A foamed ceramic based on phosphorus tailings and coal gangue and a preparation method thereof. The steps of the preparation method are:

[0048] Step 1. Mix 60wt% phosphorus tailings and 40wt% coal gangue as raw materials to obtain a mixture. in:

[0049] The SiO of the phosphorous tailings 2 The content is 74.42wt%;

[0050] The chemical composition of the gangue: Al 2 o 3 The content is 35.01wt%, and the C content is 9.48wt%;

[0051] Among the raw materials: CaO+MgO is 3.168wt%, K 2 O+Na 2 O is 2.352wt%, Fe 2 o 3 +C is 5.796 wt%.

[0052] Step 2: Stir the mixture for 16 minutes, then add 5wt% of the binder and 5wt% water of the mixture, continue to stir for 18 minutes, press to form, and dry at 105°C for 24 hours to obtain a billet body.

[0053] Step 3: The green body is heated up to 600°C at a rate of 9°C / min, then to 950°C at a rate of 3°C / min, then to 1200°C at a rate of 2°C / min, kept for 75 minutes, and then The furnace was cooled to room temperatu...

Embodiment 2

[0058] A foamed ceramic based on phosphorus tailings and coal gangue and a preparation method thereof. The steps of the preparation method are:

[0059] Step 1. Mix 65wt% phosphorous tailings and 35wt% coal gangue as raw materials to obtain a mixture. in:

[0060] The SiO of the phosphorous tailings 2 The content is 78.36wt%;

[0061] The chemical composition of the gangue: Al 2 o 3 The content is 37.25wt%, and the C content is 10.23wt%;

[0062] Among the raw materials: CaO+MgO is 3.5555wt%, K 2 O+Na 2 O is 2.6745wt%, Fe 2 o 3 +C is 5.9295 wt%.

[0063] Step 2: Stir the mixture for 17 minutes, then add 3 wt% of the binder and 7 wt% of water, continue to stir for 17 minutes, machine press, and dry at 110°C for 28 hours to obtain a billet body.

[0064] Step 3, the green body is heated up to 630°C at a rate of 8°C / min, then to 900°C at a rate of 4°C / min, and then to 1180°C at a rate of 2°C / min, kept for 90 minutes, and then The furnace was cooled to room temperatur...

Embodiment 3

[0069] A foamed ceramic based on phosphorus tailings and coal gangue and a preparation method thereof. The steps of the preparation method are:

[0070] Step 1. Mix 70wt% phosphorous tailings and 30wt% coal gangue as raw materials to obtain a mixture. in:

[0071] The SiO of the phosphorous tailings 2 The content is 78.33wt%;

[0072] The chemical composition of the gangue: Al 2 o 3 The content is 39.21wt%, and the C content is 9.74wt%;

[0073] Among the raw materials: CaO+MgO is 3.699wt%, K 2 O+Na 2 O is 2.837wt%, Fe 2 o 3 +C is 6.067 wt%.

[0074] Step 2. Stir the mixture for 20 minutes, then add 5wt% of the binder and 6wt% water of the mixture, continue to stir for 15 minutes, press to form, and dry at 106°C for 26 hours to obtain a billet body.

[0075] Step 3, the body is heated up to 650°C at a rate of 5°C / min, then to 930°C at a rate of 3°C / min, then to 1190°C at a rate of 1°C / min, kept for 45 minutes, and then The furnace was cooled to room temperature to...

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Abstract

The invention relates to foamed ceramic based on phosphate tailings and coal gangue and a preparation method of the foamed ceramic. According to the technical scheme, 60-80 wt% of phosphate tailings and 20-40 wt% of coal gangue serve as raw materials and are mixed and stirred, 3-5 wt% of a binding agent and 5-9 wt% of water are added, stirring, mechanical pressing and drying are conducted, and a green body is prepared; and heating the green body to 600-650 DEG C at a rate of 5-10 DEG C / min, then heating to 900-950 DEG C at a rate of 3-4 DEG C / min, then heating to 1150-1200 DEG C at a rate of 1-2 DEG C / min, carrying out heat preservation for 30-90 minutes, and carrying out furnace cooling to room temperature, thereby obtaining the foamed ceramic based on the phosphate tailings and the coal gangue. The method is high in recycling rate, low in cost and simple in process, and the prepared product is low in volume density, high in compressive strength, small in heat conductivity coefficient and high in acid resistance.

Description

technical field [0001] The invention belongs to the technical field of phosphorus tailings and coal gangue resource utilization. In particular, it relates to a foamed ceramic based on phosphorus tailings and coal gangue and a preparation method thereof. Background technique [0002] Phosphorus tailings are the tailings that will be produced during the beneficiation process of phosphate rock. With the continuous development and utilization of phosphate rock resources, the inventory of phosphorous tailings has increased year by year, and a large amount of solid waste of phosphorous tailings has caused huge environmental hazards. and risk. At present, the methods of reusing phosphorus tailings include: re-extracting phosphorus, preparing fertilizers, preparing chemicals, and filling mine goafs, etc. However, there is still a lot of room for improvement in the reuse rate of phosphorus tailings resources. [0003] A certain proportion of coal gangue will be produced during the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B33/132C04B33/13
CPCC04B38/0645C04B38/067C04B33/132C04B33/1305C04B2235/6562C04B2235/6567C04B2235/77C04B2235/661C04B2235/96C04B2235/9607C04B2235/9692C04B38/0067Y02P40/60
Inventor 胡南燕符芳慧叶义成柯丽华张光权王其虎姚囝罗斌玉
Owner WUHAN UNIV OF SCI & TECH
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