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Method for decomposing phosphogypsum through coupling reaction heat and vibration fluidizing

A thermally coupled, vibrating fluidized bed technology, applied in chemical instruments and methods, inorganic chemistry, sulfur compounds, etc., can solve problems affecting production continuity, difficult decomposition of phosphogypsum, and utilization rate of less than 10%, to achieve favorable Industrial operation, not easy to agglomerate, and reduce equipment investment

Inactive Publication Date: 2012-01-18
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The annual discharge of phosphogypsum in my country exceeds 22 million tons, and its utilization rate is less than 10%.
Due to the difficulty in decomposing phosphogypsum, in the rapid fluidized decomposition process, the only way to increase the decomposition rate is to increase the reaction temperature. Such a high temperature will cause the material to sinter, thus affecting the continuity of production.

Method used

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  • Method for decomposing phosphogypsum through coupling reaction heat and vibration fluidizing
  • Method for decomposing phosphogypsum through coupling reaction heat and vibration fluidizing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Take 500 g of pretreated phosphogypsum powder, add additives in an amount of 12.5% ​​of the weight of phosphogypsum, and then add and mix evenly according to the weight ratio of phosphogypsum and coke to obtain a mixture;

[0021] The pretreated phosphogypsum; the pretreatment method is: drying the phosphogypsum at a temperature of 110°C to remove free water, then drying at a temperature of 650°C to remove crystal water, and passing through an 80-mesh sieve to obtain Phosphogypsum after pretreatment;

[0022] The additive is made of SiO 2 , Fe 2 o 3 , CaO, MgO and Al 2 o 3 Prepared, the mass percentage of each component: SiO 2 50%, Fe 2 o 3 10%, CaO 20%, MgO 8%, Al 2 o 3 12%, each component is evenly mixed and passed through an 80-mesh sieve to obtain the additive.

[0023] 2) Put the mixed material into the vibrating fluidized bed, and program the temperature to 1020°C under the protection of Ar atmosphere (the heating rate is 17°C / min). After rising to ...

Embodiment 2

[0027] 1) Take 500 g of pretreated phosphogypsum powder, add additives in an amount of 12.5% ​​of the weight of phosphogypsum, and then add and mix evenly according to the weight ratio of phosphogypsum and coke to obtain a mixture;

[0028] The pretreated phosphogypsum; the pretreatment method is: drying the phosphogypsum at a temperature of 110°C to remove free water, then drying at a temperature of 650°C to remove crystal water, and passing through an 80-mesh sieve to obtain Phosphogypsum after pretreatment;

[0029] The additive is made of SiO 2 , Fe 2 o 3 , CaO, MgO and Al 2 o 3 Prepared, the mass percentage of each component: SiO 2 40%, Fe 2 o 3 17%, CaO 20%, MgO 6%, Al 2 o 317%, each component is evenly mixed and passed through an 80-mesh sieve to obtain the additive.

[0030] 2) Place the mixed material in a vibrating fluidized bed, and program the temperature to 1020°C under the protection of Ar atmosphere (the heating rate is 20°C / min). The volume concentr...

Embodiment 3

[0033] 1) Take 500 g of pretreated phosphogypsum powder, add additives in an amount of 12.5% ​​of the weight of phosphogypsum, and then add and mix evenly according to the weight ratio of phosphogypsum and coke to obtain a mixture;

[0034] The phosphogypsum is pretreated phosphogypsum; the pretreatment method is: drying the phosphogypsum at a temperature of 90°C to remove free water, then drying at a temperature of 450°C to remove crystal water, and passing through 40 mesh Sieve to obtain pretreated phosphogypsum;

[0035] The additive is made of SiO 2 , Fe 2 o 3 , CaO, MgO and Al 2 o 3 Prepared, the mass percentage of each component: SiO 2 60%, Fe 2 o 3 5%, CaO 15%, MgO 10%, Al 2 o 3 10%, each component is evenly mixed and passed through an 80-mesh sieve to obtain the additive;

[0036] 2) Put the mixed material into the vibrating fluidized bed, and program the temperature to 1020°C under the protection of Ar atmosphere (the heating rate is 17°C / min). The volume...

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Abstract

The present invention relates to a method for decomposing phosphogypsum through coupling reaction heat and vibration fluidizing. The method for decomposing the phosphogypsum through coupling the reaction heat and vibration fluidizing is characterized in that, the method comprises the following steps: 1) selecting phosphogypsum and coke according to a dry weight ratio of the phosphogypsum to the coke of (5-35):1; selecting an additive, wherein the adding amount of the additive is 12.5% of the weight of the phosphogypsum; uniformly mixing the phosphogypsum, the coke and the additive to obtain a mixed material; 2) adding the mixed material to a vibrating fluidized bed, heating the vibrating fluidized bed to a temperature of 800-1100 DEG C under a condition of argon introducing; then turning the argon off when the vibrating fluidized bed is heated to the temperature of 800-1100 DEG C, synchronously introducing air, wherein the flow rate of the air is 0.0004-0.008 m / s, the temperature of the vibrating fluidized bed is controlled to 800-1100 DEG C, the reaction time is 10-60 minutes. With the method provided by the present invention, the energy consumption can be effectively reduced, the decomposition rate of the phosphogypsum can be improved, and the product is not easy to be agglomerated.

Description

technical field [0001] The invention relates to a method for decomposing phosphogypsum through reaction heat coupling vibration fluidization, and belongs to the fields of environmental protection and treatment, chemical production technology and cement industry production. Background technique [0002] Phosphogypsum is the industrial waste discharged from the wet-process phosphoric acid production process, and its main chemical composition is CaSO 4 2H 2 O, and other small amounts of SiO 2 , Al 2 o 3 , Fe 2 o 3 , P 2 o 5 and impurities such as fluoride. According to statistics, about 4.5-5.5 tons of phosphogypsum are produced for every ton of phosphoric acid produced. my country's annual discharge of phosphogypsum exceeds 22 million tons, and its utilization rate is less than 10%. A large amount of phosphogypsum stacking not only occupies a large amount of land resources, pollutes the atmosphere, water sources and soil, but also causes a large amount of waste of su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/04C01B17/50B09B3/00
Inventor 刘少文郭文涛吴元欣陈升贾辉包传平
Owner WUHAN INSTITUTE OF TECHNOLOGY
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