Device and method for microwave-enhanced fluidized phosphogypsum dehydration

A phosphogypsum and fluidization technology, which is applied in the field of microwave-enhanced fluidized phosphogypsum dehydration devices, can solve the problems of secondary pollution discharge, product instability, low production efficiency, etc., achieve low tail gas temperature and ensure product stability Sexuality and fast heating effect

Active Publication Date: 2021-12-31
云南云天化环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the limitations of the existing phosphogypsum calcination dehydration technology, that is, the existing phosphogypsum calcination technology has low thermal efficiency, unstable products, low production efficiency, and fuel CO 2 Emissions cause secondary pollution and other issues

Method used

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  • Device and method for microwave-enhanced fluidized phosphogypsum dehydration
  • Device and method for microwave-enhanced fluidized phosphogypsum dehydration
  • Device and method for microwave-enhanced fluidized phosphogypsum dehydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: This Example The present embodiment treatment target is a phosphite produced during phosphoric acid in a phosphate wet method, and the analysis results are as follows.

[0036] Test items Attach water Crystalline water grade pH result 22 17.3 85 3.4

[0037] (1) After the water phase is removed: After washing the phosphite from the filter turntable, after the water is pulsed, the spiral feed is entered into the venturi tube, and the hot air is supplied 330 ° C hot air and 12m 3 The flow of / h enters the bottom of the venturi tube to remove the water in the ketzeplant, and the cake is dispelled, and the residence time of the phosphite in Wenqiao is 90s, and then the phosphite enters the cyclone preheater. In the hot air furnace, the hot air of 210 ° C is provided and 8m 3 The flow rate of / h further removes water, the phosphite residence time is 120s, and finally the water content of the phosphite is maintained at about 1-3%.

[0038] (2...

Embodiment 2

[0049] Example 2: The present embodiment processes the phosphite stacked in a phosphite slag library, and the results are as follows.

[0050] Test items Attach water Crystalline water grade pH result 12 18.6 89 4.8

[0051] (1) After the water phase is removed: After washing the phosphite water in the residue, the spiral feed is entered into the venturi tube, and the hot air supply is supplied with heat and air and at 12m. 3 The flow of the / h enters the bottom of the venturi tube to remove the water at the bottom of the phosphite at the same time, the cake is disperse, the residence time of phosphite in Wenqiao is 110s, and then phosphite enters the cyclone preheater. The hot air furnace provides hot air in 195 ° C and 8m 3 The flow rate of / h further removes water, the phosphite residence time is 130s, and finally the water content of the phosphite is maintained at 1% to 3%.

[0052](2) Six fluidization stage: SiC powder with a mass of 600 g, particle...

Embodiment 3

[0059] Example 3: This embodiment handles the desulfurization gypsum generated by the flue gas desulfurization of a chemical plant, and the results are as follows.

[0060] Test items Attach water grade pH result 8 92 5.1

[0061] (1) Remove the water stage: Enter the desulfurized gypsum into the venturi tube by the spiral feed, and the hot air is provided at 250 ° C hot air and 12m. 3 The flow of the / h enters the bottom of the venturi tube to remove the water at the bottom of the phosphite at the same time, the cake is dispelled, and the residence time of the phosphite in Wenqi is 80s, and then the phospantine enters the cyclone preheater. In the hot air furnace, heat air is supplied with 180 ° C and 8m 3 The flow rate of / h further removes water, the phosphite residence time is 100s, and finally the water content of the phosphite is maintained at about 1-3%.

[0062] (2) Mix fluidization stage: Si of 500g of mass, particle size is 15-140μm 3 N 4 After t...

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Abstract

The invention discloses a device and method for microwave-enhanced fluidized ardealite dehydration. The method comprises the following steps: ardealite is added into a system through a screw feeder; hot air provided by a hot blast stove is subjected to venturi drying, attached water in phosphogypsum is removed by a cyclone preheater, and then the hot air enters a wave-transparent heating section of the fluidized bed together with a wave-absorbing powder substance for mixing fluidization; and microwaves penetrate through the wave-transparent heating section in the resonant cavity and are absorbed by the wave-absorbing powder substance and the ardealite, and the removal of ardealite crystal water is simultaneously realized in solid-solid, gas-solid and microwave heating modes by utilizing heat generated by high-speed movement of molecules. Due to the change of the fluidization height of the ardealite without crystal water, the ardealite is separated from the wave-absorbing powder substance. The method and the device are wide in applicability, can realize continuous production of two products by one set of device, and are high in heat efficiency, high in heating speed, uniform in material heating, high in product stability, enhanced in polar component on the surface of hemihydrate gypsum molecules, reduced in contact angle, low in tail gas temperature and small in heat loss.

Description

Technical field [0001] The present invention relates to a microwave apparatus and method for reinforcing fluidizing dehydrated phosphogypsum, belonging to the field of utilization of phosphogypsum. Background technique [0002] A phosphogypsum wet phosphoric acid production process by-product waste, wet process phosphoric acid after the reaction slurry was filtered to produce a byproduct with phosphogypsum obtained while washing with phosphoric acid, typically phosphoric acid byproduct production 1t 4.5 ~ 5.5t phosphogypsum. With the development of phosphorus chemical industry, phosphogypsum emissions also increased year by year. Currently, the annual output of about phosphogypsum 8000wt, since phosphogypsum containing phosphorus impurities, fluoro impurities, organic substances, alkali metal salts, and SiO 2 Impurities and other impurities complex and diverse, not leading to undergo purification treatment of phosphogypsum can not be effectively resource utilization. my country's...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/028C04B11/26C04B11/02
CPCC04B11/26C04B11/02C04B11/0283C04B11/028
Inventor 张晖李恒钟晋李瑞
Owner 云南云天化环保科技有限公司
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