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Method for vibrating, fluidizing and decomposing phosphogypsum

A phosphogypsum and fluidization technology, applied in chemical instruments and methods, inorganic chemistry, sulfur compounds, etc., can solve problems affecting production continuity, material sintering, etc., to facilitate the reduction of sulfuric acid production costs, not easy to agglomerate, Effect of improving decomposition rate and desulfurization rate

Inactive Publication Date: 2013-03-20
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high temperature will cause the material to sinter and affect the continuity of production

Method used

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  • Method for vibrating, fluidizing and decomposing phosphogypsum

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Experimental program
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Effect test

Embodiment 1

[0024] A method for vibrating fluidized decomposition of phosphogypsum, comprising the steps of:

[0025] 1) Phosphogypsum pretreatment: dry phosphogypsum at 120°C for 2 hours to remove free water, then dry at 650°C (dry for 2 hours), remove crystal water, crush, and sieve to obtain phosphogypsum Powder, the particle size of phosphogypsum powder is 10-50 microns;

[0026] 2) Preparation of composite admixture: according to the mass percentage of each component: SiO 2 50%, Fe2 o 3 10%, CaO 20%, MgO 5%, Al 2 o 3 15%, select SiO 2 , Fe 2 o 3 , CaO, MgO and Al 2 o 3 ; Each component is passed through 80 mesh sieve; SiO 2 , Fe 2 o 3 , CaO, MgO and Al 2 o 3 Mix to obtain a composite admixture;

[0027] 3) Take 500g of the above-mentioned phosphogypsum powder, and mix the composite admixture and the phosphogypsum powder evenly in a mass ratio of 1:7 to obtain a mixture;

[0028] 4) Equipment preparation: such as figure 1 As shown, the uniform fluidized decompositio...

Embodiment 2

[0032] A method for vibrating fluidized decomposition of phosphogypsum, comprising the steps of:

[0033] 1) Phosphogypsum pretreatment: dry phosphogypsum at 120°C for 2 hours to remove free water, then dry at 650°C (dry for 2 hours), remove crystal water, crush, and sieve to obtain phosphogypsum Powder, the particle size of phosphogypsum powder is 10-50 microns;

[0034] 2) Preparation of composite admixture: according to the mass percentage of each component: SiO 2 60%, Fe 2 o 3 10%, CaO 10%, MgO 5%, Al 2 o 3 15%, the sum of the mass percentages of each component is 100%, choose SiO 2 , Fe 2 o 3 , CaO, MgO and Al 2 o 3 ; Each component is passed through 80 mesh sieve; SiO 2 , Fe 2 o 3 , CaO, MgO and Al 2 o 3 Mix to obtain a composite admixture;

[0035] 3) Take 500g of phosphogypsum powder, mix the composite admixture and phosphogypsum powder evenly in a mass ratio of 1:7, and obtain a mixture;

[0036] 4) Equipment preparation: such as figure 1 As shown,...

Embodiment 3

[0040] A method for vibrating fluidized decomposition of phosphogypsum, comprising the steps of:

[0041] 1) Phosphogypsum pretreatment: dry phosphogypsum at 120°C for 2 hours to remove free water, then dry at 650°C (dry for 2 hours), remove crystal water, crush, and sieve to obtain phosphogypsum Powder, the particle size of phosphogypsum powder is 10-50 microns;

[0042] 2) Preparation of composite admixture: according to the mass percentage of each component: SiO 2 40%, Fe 2 o 3 20%, CaO 20%, MgO 10%, Al 2 o 3 10%, select SiO 2 , Fe 2 o 3 , CaO, MgO and Al 2 o 3 ; Each component is passed through 80 mesh sieve; SiO 2 , Fe 2 o 3 , CaO, MgO and Al 2 o 3 Mix to obtain a composite admixture;

[0043] 3) Take 500g of phosphogypsum powder, mix the composite admixture and phosphogypsum powder evenly in a mass ratio of 1:7, and obtain a mixture;

[0044] 4) Preparation of equipment: Set the uniform fluidized decomposition furnace 1 outside the kiln on the vibratio...

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Abstract

The invention relates to a method for vibrating, fluidizing and decomposing phosphogypsum. The method is characterized by comprising the following steps of: 1) pretreating the phosphogypsum; 2) preparing a composite additive; 3) uniformly mixing the composite additive and the phosphogypsum in a mass ratio of 1:7 to prepare a mixture; 4) preparing equipment; 5) reducing and decomposing, namely feeding the mixture into a uniform fluidizing decomposing furnace out of a kiln; heating to the temperature of between 850 DEG and 1,100 DEG C under the protection of Ar atmosphere; introducing CO at the flow rate of 5 to 50mL / min; making the volume flow ratio of the CO to the Ar to be 1:2-19; controlling the temperature to be between 850 and 1,100 DEG C; and starting a vibration energy loading device. The method has the characteristics of not easily agglomerated materials, high fluidizing quality, low fluidizing gas velocity, high SO2 concentration in tail gas, low dust content, low process energy consumption, contribution to industrial large-scale conduction production, and capability of reducing sulfuric acid production cost.

Description

technical field [0001] The invention relates to a method for vibrating fluidized decomposition of phosphogypsum, which belongs to the technical field of environmental protection and chemical production. Background technique [0002] Phosphogypsum is the solid waste generated during the production process of wet-process phosphoric acid. At present, phosphogypsum is mainly discarded by stacking in the open air. The large stockpiling of phosphogypsum not only encroached on land resources, but also easily caused air, soil and water pollution due to wind and rain erosion. At the same time, phosphogypsum is also a valuable sulfur resource that can be used to produce sulfuric acid. According to reports, my country's phosphogypsum discharge in 2007 was about 50 million tons, and with the increase in the production of high-concentration phosphorus compound fertilizers, the discharge of phosphogypsum gradually increased. The cumulative stock of phosphogypsum in my country has exceede...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C01B17/50
CPCY02P40/10
Inventor 刘少文冉祥兰吴元欣郭文涛陈升
Owner WUHAN INSTITUTE OF TECHNOLOGY