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Method for preparing oxygen carrier by using phosphogypsum, and applications of carrier

A phosphogypsum, oxygen carrier technology, applied in the petroleum industry, fuel additives, fuels, etc., can solve problems such as land occupation and environmental pollution, and achieve the effects of promoting development, improving utilization, and avoiding economic losses.

Active Publication Date: 2016-01-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Stacking phosphogypsum not only takes up a lot of land, but also causes serious environmental pollution. Therefore, it is necessary to find a reasonable way to use phosphogypsum in order to realize the scientific development of the phosphating industry

Method used

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  • Method for preparing oxygen carrier by using phosphogypsum, and applications of carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The method for preparing an oxygen carrier by utilizing phosphogypsum, its specific steps are as follows:

[0030] (1) First, 1kg of phosphogypsum with a moisture content of 30wt% is naturally air-dried to a moisture content of 20wt%, then add bentonite with a mass of 0.6% of the phosphogypsum to the phosphogypsum, mix thoroughly and then granulate, and then dry at a temperature of 280°C 4h, select 80 mesh phosphogypsum particles, wherein the mass fraction of CaO in phosphogypsum is 38%;

[0031] (2) Pass 200ml / min of CH to the phosphogypsum particles obtained in step (1) 4 Gas, pre-reduced at a temperature of 1100°C for 120 minutes to obtain a reduced product;

[0032] (3) The reduction product obtained in step (2) was oxidized and regenerated for 120 minutes under the condition of 200ml / min anhydrous air atmosphere and a temperature of 900°C to obtain a regenerated product;

[0033] (4) Add carriers, additives and active components to the regeneration product obtain...

Embodiment 2

[0036] The method for preparing an oxygen carrier by utilizing phosphogypsum, its specific steps are as follows:

[0037](1) First, 1kg of phosphogypsum with a moisture content of 30wt% is naturally air-dried to a moisture content of 20wt%, then add bentonite with a mass of 0.6% of the phosphogypsum to the phosphogypsum, mix thoroughly and then granulate, and then dry at a temperature of 230°C 6h, select 70 mesh phosphogypsum particles, wherein the mass fraction of CaO in phosphogypsum is 33%;

[0038] (2) Pass 150ml / min of CH to the phosphogypsum particles obtained in step (1) 4 Gas, pre-reduced at a temperature of 1000°C for 90 minutes to obtain a reduced product;

[0039] (3) The reduction product obtained in step (2) was oxidized and regenerated for 90 minutes under the condition of 150ml / min anhydrous air atmosphere and a temperature of 800°C to obtain a regenerated product;

[0040] (4) Add carriers, additives and active components to the regeneration product obtained ...

Embodiment 3

[0043] The method for preparing an oxygen carrier by utilizing phosphogypsum, its specific steps are as follows:

[0044] (1) First, 1kg of phosphogypsum with a moisture content of 30wt% is naturally air-dried to a moisture content of 20wt%, then add bentonite with a mass of 0.6% of the phosphogypsum to the phosphogypsum, mix thoroughly and then granulate, and then dry at a temperature of 150°C 10h, select 60 mesh phosphogypsum particles, wherein the mass fraction of CaO in the phosphogypsum is 33%;

[0045] (2) Pass 50ml / min of CO gas into the phosphogypsum particles obtained in step (1), and pre-reduce at a temperature of 800°C for 30 minutes to obtain a reduced product;

[0046] (3) The reduction product obtained in step (2) was oxidized and regenerated for 30 minutes under the condition of passing through an anhydrous air atmosphere of 50ml / min at a temperature of 700°C to obtain a regenerated product;

[0047] (4) Add carriers, additives and active components to the rege...

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Abstract

The present invention relates to a method for preparing an oxygen carrier by using phosphogypsum, and applications of the carrier, and belongs to the technical field of solid waste resources. The method comprises: carrying out nature air-drying on phosphogypsum, adding bentonite to the phosphogypsum, completely and uniformly mixing, granulating, and drying to obtain phosphogypsum particles; introducing CH4 or CO gas to the obtained phosphogypsum particles, carrying out pre-reduction for 30-120 min at a temperature of 800-1100 DEG C to obtain a reduction product, and removing volatile impurities (heavy metals and organic compounds); carrying out oxidation regeneration on the obtained reduction product for 30-120 min at a temperature of 700-900 DEG C under introduction of 50-200 ml / min of anhydrous air atmosphere to obtain a regeneration product; and adding a carrier to the obtained regeneration product, completely and uniformly mixing an auxiliary agent and an active component to obtain a mixed product, carrying out molding processing on the mixed product according to the actual demand, and calcining for 6-12 at a temperature of 700-900 DEG C to obtain the oxygen carrier. A purpose of the present invention is to use the phosphogypsum as the oxygen carrier so as to achieve a lot of utilization of the waste resources.

Description

technical field [0001] The invention relates to a method for preparing an oxygen carrier by using phosphogypsum and the application of the oxygen carrier, belonging to the technical field of solid waste resources. Background technique [0002] As an important intermediate product, phosphoric acid is widely used in chemical fertilizers, ceramics, glass, textiles, food and other industries. With the continuous development of the phosphorus chemical industry, especially with the rapid development of the high-concentration phosphorus compound fertilizer industry in agriculture, Phosphogypsum, a by-product of the wet process phosphoric acid process, is produced and piled up as an industrial waste residue in large quantities, but its actual utilization rate is very low. As a kind of hazardous waste, phosphogypsum is a kind of hazardous waste. It not only needs a lot of manpower, material and financial resources, but also has great harm to the environment. Although there are many w...

Claims

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Application Information

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IPC IPC(8): C10L10/00
Inventor 祝星翟康王华李孔斋祁先进施从志徐媛曾良鹏邢艳彬魏永刚
Owner KUNMING UNIV OF SCI & TECH