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Method for reductive decomposition of phosphogypsum with hydrogen gas

A technology of phosphogypsum and hydrogen, applied in chemical instruments and methods, calcium/strontium/barium oxides/hydroxides, inorganic chemistry, etc., can solve unseen problems, reduce process energy consumption, and reduce production costs , the effect of not easy to agglomerate

Inactive Publication Date: 2012-07-11
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the research reports on its special use in fluidized bed decomposition have not been seen

Method used

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  • Method for reductive decomposition of phosphogypsum with hydrogen gas

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Experimental program
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Embodiment 1

[0026] A method for hydrogen reduction and decomposition of phosphogypsum, which comprises the steps:

[0027] 1) Raw material pretreatment: the raw material is phosphogypsum, the crystal water content of the phosphogypsum raw material is 19.02-23.49% (wet basis), the attached water content is 0.0099-0.167% (wet basis), and the particle size of the phosphogypsum is D 50 =13.57μm;

[0028] Bake the phosphogypsum raw material at a temperature of 600-650° C. for 120-150 minutes (drying) to remove crystal water, cool and crush, and pass through a 200-mesh sieve (Shanghai standard sieve) to obtain pretreated phosphogypsum for use;

[0029] 2) get 189g of pretreated phosphogypsum, press the mass ratio of pretreated phosphogypsum: additive A: additive B=87:12:1, choose pretreated phosphogypsum, additive A and additive B, mix , get the mixture;

[0030] The composition and mass percent of the additive A are: SiO 2 71%, Al2 O 3 16%, Fe 2 O 3 6%, CaO2%, MgO5%;

[0031] The compos...

Embodiment 2

[0034] A method for hydrogen reduction and decomposition of phosphogypsum, which comprises the steps:

[0035] 1) Raw material pretreatment: the raw material is phosphogypsum, the crystal water content of the phosphogypsum raw material is 19.02-23.49% (wet basis), the attached water content is 0.0099-0.167% (wet basis), and the particle size of the phosphogypsum is D 50 =13.57μm;

[0036] Bake the phosphogypsum raw material at a temperature of 600-650° C. for 120-150 minutes (drying) to remove crystal water, cool and crush, and pass through a 200-mesh sieve (Shanghai standard sieve) to obtain pretreated phosphogypsum for use;

[0037] 2) get 95g of pretreated phosphogypsum, press the mass ratio of pretreated phosphogypsum: additive A: additive B=87:12:1, choose pretreated phosphogypsum, additive A and additive B, mix , get the mixture;

[0038] The composition and mass percent of the additive A are: SiO 2 71%, Al 2 O 3 16%, Fe 2 O 3 6%, CaO2%, MgO5%;

[0039] The compo...

Embodiment 3

[0042] A method for hydrogen reduction and decomposition of phosphogypsum, which comprises the steps:

[0043] 1) Raw material pretreatment: the raw material is phosphogypsum, the crystal water content of the phosphogypsum raw material is 19.02-23.49% (wet basis), the attached water content is 0.0099-0.167% (wet basis), and the particle size of the phosphogypsum is D 50 =13.57μm;

[0044] Bake the phosphogypsum raw material at a temperature of 600-650° C. for 120-150 minutes (drying) to remove crystal water, cool and crush, and pass through a 200-mesh sieve (Shanghai standard sieve) to obtain pretreated phosphogypsum for use;

[0045] 2) get 48g of pretreated phosphogypsum, press the mass ratio of pretreated phosphogypsum: additive A: additive B=88:11:1, choose pretreated phosphogypsum, additive A and additive B, mix , get the mixture;

[0046] The composition and mass percent of the additive A are: SiO 2 75%, Al 2 O 3 12%, Fe 2 O 3 7%, CaO2.5%, MgO3.5%;

[0047] The c...

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Abstract

The invention relates to a method for reductive decomposition of phosphogypsum with hydrogen gas, belonging to the fields of environmental protection control, chemical industry production technology and resource utilization. The method for reductive decomposition of phosphogypsum with hydrogen gas is characterized by comprising the following steps of: (1) pretreating raw materials; (2) mixing pretreated phosphogypsum, an additive A and an additive B at a mass ratio of (80-100):(10-20):1 to obtain a mixed material; and (3) conveying the mixed material to a vibrating fluidized bed, heating to 950-1050 DEG C under the protection of Ar atmosphere, then introducing H2, reacting for 10-60min while controlling the H2 volume concentration at 1-5% and the fluidized bed internal temperature at 950-1050 DEG C, and drying tail gas generated in the reaction process to be used as a raw material for producing sulfuric acid by an acid production process. The method has the advantages that the materials are difficult to agglomerate and char, the process energy consumption is reduced, the average volume concentration of SO2 in the tail gas is high, and the decomposition rate and the desulfurization rate are greatly increased.

Description

technical field [0001] The invention relates to a method for reducing and decomposing phosphogypsum with hydrogen, and belongs to the fields of environmental protection treatment, chemical production technology and resource utilization. Background technique [0002] Phosphogypsum is a by-product of the process of producing phosphoric acid by decomposing phosphate rock with sulfuric acid. Phosphoric acid is the main raw material for the production of high-concentration phosphate fertilizers, producing 1tP 2 O 5 Phosphoric acid is about 5t of by-product phosphogypsum. The annual emission of phosphogypsum in the world exceeds 280 million tons, and the annual emission of phosphogypsum in my country exceeds 22 million tons, and its utilization rate is less than 10% of the total. Stacking phosphogypsum not only occupies a lot of land, pollutes the environment, but also brings a large economic burden to production enterprises. The comprehensive utilization of phosphogypsum has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/50C01F11/08C01F11/00
Inventor 刘少文陈升吴元欣贾辉郭文涛包传平
Owner WUHAN INSTITUTE OF TECHNOLOGY
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