Production process for preparing calcium oxide and sulfur dioxide by decomposing ardealite

A sulfur dioxide, production process technology, applied in the fields of calcium/strontium/barium oxide/hydroxide, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of low comprehensive utilization of phosphogypsum waste residue, and achieve the reduction of production equipment specifications , save engineering investment, and improve the effect of ecological environment

Inactive Publication Date: 2009-12-16
SINOPEC NANJING ENG & CONSTR
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Problems solved by technology

[0004] The purpose of the present invention is to provide a production process for preparing calcium oxide and sulfur dioxide by decomposing phosphogypsum to solve the problem of low comprehensive utilization of phosphogypsum waste residue in the prior art

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  • Production process for preparing calcium oxide and sulfur dioxide by decomposing ardealite

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Experimental program
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Embodiment 1

[0025] A 20,000-ton / year phosphogypsum decomposition device (calculated on the basis of decomposed dry phosphogypsum), which consists of a production line, and its process is as follows figure 1 As shown, the main equipment is as follows:

[0026] (1) Granulator (Q=2700kg / h, carbon steel casing)

[0027] (2) Drum dryer D=1200mm L=8000mm carbon steel

[0028] (3) Gas combustion furnace Q=260×10 4 kcal / h

[0029] (4) Fluidized bed decomposition furnace 2700kg / h, D=1560mm

[0030] (5) The hearth diameter of the gas generator is 1.4 meters, and the coal consumption is 800 kg / hour.

[0031] After the phosphogypsum and coke powder with a particle size of about 0.2mm are accurately measured by the weight loss scale, they are added to the mixer by the bucket elevator according to the weight ratio of 20:1 after drying and mixed evenly, and then flowed into the double-screw granulator to make Granules, forming granular materials with a size of about 2mm, enter the drum dryer for dr...

Embodiment 2

[0034] Equipment is the same as embodiment 1, and other conditions are as follows:

[0035]After the phosphogypsum and coke with a particle size of about 0.6mm are accurately measured by the weight loss scale, they are added to the mixer by the bucket elevator according to the weight ratio of 16:1 after drying and mixed evenly, and then flow into the double-screw granulator for granulation , to form granular materials with a size of about 1mm, and enter the rotary drum dryer for drying and dehydration. The moisture content of the dried mixed materials is controlled below 3%, and the dried materials are continuously, uniformly and quantitatively added to the decomposition furnace (phosphogypsum dosage: 2.8 tons / hour, coke charging amount: 0.175 tons / hour), make it directly contact with the high-temperature furnace gas whose airflow velocity is 2m / s, maintain the reaction temperature in the furnace at 1150°C for 20 minutes, the generated sulfur dioxide gas (volume The percentage...

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Abstract

The invention belongs to the technical field of environmental protection treatment and chemical engineering production, and relates to a production process for preparing calcium oxide and sulfur dioxide by decomposing ardealite. The process comprises the following steps of: mixing the ardealite and charcoal according to a dry weight ratio of 10-20:1, granulating the mixture to obtain particles of which the particle size is between 1 and 4mm, drying and dewatering the particles, putting the particles in a fluidized bed decomposing furnace to be directly contacted with high-temperature furnace gas for reaction for 15 to 50 minutes at a temperature of between 1,000 and 1,300 DEG C, and generating the sulfur dioxide gas and the calcium oxide. The process can solve the problem of comprehensively utilizing waste residues of ardealite, the content of SO2 in the discharged tail gas is high enough to be used for producing sulfuric acid, and the calcium oxide which is a byproduct can be used in various industries such as construction, road, aquaculture and the like, so that the process meets the requirements on the scientific outlook on development; moreover, compared with the process for co-production of cement by sulfuric acid prepared by the ardealite, the process greatly saves investment and electric consumption.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and chemical production, and relates to a production process for preparing calcium oxide and sulfur dioxide by decomposing phosphogypsum. Background technique [0002] my country is a large agricultural country, and it needs to apply about 20 million tons of high-concentration phosphorus compound fertilizers every year. Phosphogypsum is the waste residue formed in the process of producing wet-process phosphoric acid (wet-process phosphoric acid is mainly used to produce phosphate fertilizer). Every ton of wet-process phosphoric acid ( with P 2 o 5 Total) to produce 4.5-5 tons of phosphogypsum waste residue, my country needs to produce more than 8 million tons of wet-process phosphoric acid every year, produce about 40 million tons of phosphogypsum waste residue, and need to add 2800hm of storage space every year 2 , due to the large amount of phosphogypsum and complex components,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/04C01B17/50B09B3/00
Inventor 陈德兴赵启成孙国超丁德成俞向东
Owner SINOPEC NANJING ENG & CONSTR
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