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Preparation method of composite oxygen carrier with compact structure, and product thereof

A composite material and oxygen carrier technology, applied in the field of composite materials, can solve the problems of difficult control, complicated preparation process, high cost, etc., and achieve the effects of stable physical structure and characteristics, easy interface reaction between particles, and low porosity

Pending Publication Date: 2020-04-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main preparation methods of oxygen carrier include impregnation method, sol-gel method, freeze granulation method, spray drying method, mechanical mixing method, spraying method, etc., wherein the impregnation method and sol-gel method use liquid preparation raw materials, and the preparation The process is complicated and difficult to control. Oxygen carrier particles prepared by freeze granulation, spray drying and spraying methods have low crushing strength and expensive binders are used in the preparation process, resulting in high cost. The process is simple, but the irregular particles made are easily broken in the circulating fluidized bed

Method used

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  • Preparation method of composite oxygen carrier with compact structure, and product thereof
  • Preparation method of composite oxygen carrier with compact structure, and product thereof
  • Preparation method of composite oxygen carrier with compact structure, and product thereof

Examples

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preparation example Construction

[0031] Such as figure 1 As shown, a method for preparing a tightly structured composite oxygen carrier includes the following steps: (1) material pretreatment; (2) material dry mixing; (3) material wet mixing; (4) material extrusion; (5) ) Material spheronization; (6) Dry forming; (7) High temperature calcination;

[0032] It includes the following steps:

[0033] (1) Material pretreatment: Put the initially crushed solid powder in a heating furnace for pre-calcination. After cooling to room temperature, the coarse particles are further ground, and the powders below 100 μm are sieved through a standard sieve for use. In the industrial field, powders with a particle size greater than 100 μm are difficult to use; the purpose of pre-calcination is to improve the mechanical properties of the solid powder precursor. Strengthen or remove the sulfur components contained in the copper ore, the coarse particles are placed in a porcelain boat and calcined in a heating furnace. The pre-calci...

Embodiment 1

[0045] This embodiment provides a method for preparing a composite oxygen carrier by extrusion using solid powder as a raw material, including the following steps:

[0046] (1) Place the coarsely crushed natural copper ore and iron ore in a heating furnace, and calcinate at 500°C for 5 hours in an air atmosphere, then heat to 1000°C and continue calcination at this temperature for 10 hours. The heating rate is 10°C / min. After cooling to room temperature, further grind the coarse particles and sieving out the ones below 100μm for use;

[0047] (2) Fully mix copper ore and iron ore in a mass ratio of 2:8, then add an additional 10wt.% of montmorillonite, and then continuously stir to obtain a uniform powder;

[0048] (3) Put the powder obtained above in a ball mill and mill it at a certain speed for a certain time; the speed of the ball mill is 100r / min, and the time of the ball mill is 5h;

[0049] (4) Add an appropriate amount of tap water to the uniformly stirred powder, and stir wh...

Embodiment 2

[0059] (1) Place the coarse grains of natural copper ore after preliminary crushing in a heating furnace, and calcine at 500℃ for 5 hours in an air atmosphere, then heat up to 1000℃ and continue calcination at this temperature for 10 hours. The heating rate is 10°C / min. After cooling to room temperature, further grind the coarse particles, sieving out the ones below 100μm for use, and also crush the red mud and sieving out the ones below 100μm for use;

[0060] (2) Fully mix the copper ore and red mud according to the mass ratio of 1:8, and then add 10wt.% of montmorillonite, and then continuously stir to obtain a uniform powder;

[0061] (3) Put the evenly stirred powder in a ball mill with a speed of 200r / min and a ball milling time of 2h;

[0062] (4) Add an appropriate amount of tap water to the evenly stirred powder, and stir while adding to obtain a uniform and slightly viscous slurry. The mass fraction of tap water in the slurry is 20%;

[0063] (5) Add the slurry to the extru...

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Abstract

The invention belongs to the field of composite materials, and discloses a preparation method of a composite oxygen carrier with a compact structure, and a product thereof. The preparation method comprises the following steps: (a) selecting one or more kinds of solid powder as a raw material, pre-calcining the raw material, and then grinding the pre-calcined raw material to obtain active powder; (b) adding a binder into the active powder, carrying out uniform mixing under stirring to obtain uniformly-mixed powder, performing ball milling, adding a solvent into the ball-milled powder, and carrying out uniform mixing under stirring to obtain slurry; and (c) adding the slurry as a raw material into an extruder, performing spheroidizing to obtain spherical particles, drying the spherical particles, and calcining the spherical particles at a high temperature to obtain the desired composite oxygen carrier. According to the method, ore waste powder, industrial waste and solid powder which cannot be directly used as the oxygen carrier or has poor effect when individually used as the oxygen carrier are used as the raw materials; the method is simple and convenient; cost is low; and the prepared oxygen carrier is high in strength and high in reaction activity.

Description

Technical field [0001] The invention belongs to the field of composite materials, and more specifically, relates to a preparation method and product of a composite oxygen carrier with a compact structure. Background technique [0002] Chemical chain combustion is a kind of CO that can achieve low cost and low energy consumption. 2 The new combustion method of internal separation uses oxygen carrier recycling to transfer the active oxygen required by the fuel during the combustion process, avoiding CO 2 N in the air 2 dilution. Oxygen carrier is the key to the success of chemical chain combustion technology. Natural ore oxygen carrier is one of the hotspots that people pay attention to. This type of oxygen carrier has the characteristics of low cost. Usually, particles with a size of 100-300μm are used, but the size of the 100μm ore powder cannot be used effectively, and the reaction effect of a single natural ore oxygen carrier is often not particularly good (such as iron ore, co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/12
CPCC10L9/12
Inventor 赵海波董云昌王亚男马琎晨郑传宝苏钊
Owner HUAZHONG UNIV OF SCI & TECH
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