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Method for producing sulfuric acid utilizing phosphogypsum slag

A production method, phosphogypsum technology, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the three wastes pollution and other problems, achieve significant economic benefits, significant environmental protection social benefits, and solve the effect of waste residue pollution

Inactive Publication Date: 2006-05-24
四川省犍为明丰化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention is based on the existing chemical technology, especially for the problem of three wastes pollution caused by phosphogypsum waste residue discharged by phosphate chemical enterprises, and proposes a production method for producing sulfuric acid by recycling phosphogypsum waste residue, which is Extracting sulfur ore resources from phosphogypsum waste residue to replace pyrite as raw material to produce sulfuric acid products, the present invention is realized according to the following technical scheme:

Method used

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  • Method for producing sulfuric acid utilizing phosphogypsum slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Utilize the phosphogypsum waste residue that the present invention proposes to produce the production method of sulfuric acid, it carries out by the steps of following order successively:

[0025] (1) metering batching: each reaction raw material is counted as by weight:

[0026] Phosphogypsum waste residue 1 part,

[0027] Coal 0.25 parts,

[0028] Send the weighed raw materials into the pulverizer for crushing to make a mixed material.

[0029] (2) Reduction roasting: send the prepared mixed material into the converter for reduction roasting reaction, control the temperature in the roasting furnace to be 1000°C, and carry out reduction roasting for 15 minutes under the condition of stirring and stirring. The reduction roasting reaction equation is as follows:

[0030]

[0031] Generate calcium sulfide CaS and carbon dioxide flue gas,

[0032] (3) Metathesis reaction: Send the calcium sulfide CaS obtained by reduction roasting into t...

Embodiment 2

[0043] It proceeds through the steps in the following order:

[0044] (1) metering batching: each reaction raw material is counted as by weight:

[0045] Phosphogypsum waste residue 1 part,

[0046] Coal 0.15 parts,

[0047] Send the weighed raw materials into the pulverizer for crushing to make a mixed material.

[0048] (2) Reduction roasting: send the prepared mixed material into the converter for reduction roasting reaction, control the temperature in the roasting furnace to be 800°C, and carry out reduction roasting for 10 minutes under the condition of stirring and stirring. The reduction roasting reaction equation is as follows:

[0049]

[0050] Generate calcium sulfide and carbon dioxide flue gas,

[0051] (3) Metathesis reaction: Send the calcium sulfide obtained by reduction roasting into a pulverizer for pulverization, and send water into the reaction tank according to 2 times the weight of calcium sulfide, and add acetic acid (as ...

Embodiment 3

[0062] It proceeds through the steps in the following order:

[0063] (1) metering batching: each reaction raw material is counted as by weight:

[0064] Phosphogypsum waste residue 1 part,

[0065] Coal 0.35 parts,

[0066] Send the weighed raw materials into the pulverizer for crushing to make a mixed material.

[0067] (2) Reduction roasting: send the prepared mixed material into the converter for reduction roasting reaction, control the temperature in the roasting furnace to be 1200° C., and carry out the reduction roasting reaction for 20 minutes under the working condition of stirring. The reduction roasting reaction equation is as follows:

[0068]

[0069] Formation of calcium sulfide CaS and carbon dioxide CO 2 flue gas,

[0070] (3) Metathesis reaction: Send the calcium sulfide CaS obtained by reduction roasting into the pulverizer for pulverization, and send water into the reaction tank according to 4 times the weight of calcium ...

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Abstract

The invention is a method for making vitriol using phosphorus plaster with respect to the three-waste problem caused by the phosphorus plaster waste residues, in turn mixing, reductively baking, making double decomposition reaction, making absorption reaction, press filtering to make filter cake and baking to make sulfur, recovering and extracting sulfur ore resources from the phosphorus plaster waste residues to replace the sulfurous iron ore to act as raw material to produce vitriol product, achieving the purpose of turning waste into wealth. The invention solves the pollution problem of waste residues of puzzling long-time and restricting the development of phosphorus chemical industrial enterprises of our country. And the invention can largely reduce the production cost and has completely remarkable social and economic benefits.

Description

Technical field: [0001] The invention relates to a technology for producing sulfuric acid from phosphogypsum waste residue discharged by the phosphate industry, which belongs to the field of "three wastes treatment" in environmental protection and the technical field of chemical production. The production method of sulfuric acid. Background technique: [0002] We know that in the phosphate production industry, especially when phosphate rock and sulfuric acid are used to produce wet-process phosphoric acid and phosphate series products, a large amount of phosphogypsum waste residue is generated. Existing phosphate chemical companies are all Phosphogypsum waste residue is directly discharged and discarded as industrial waste residue. Day after day, year after year, it has been discharged and accumulated for a long time, forming a vicious circle. The discharged waste phosphogypsum residue has accumulated from a "hill" to a "big mountain". It has become a "waste mountain" environ...

Claims

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Application Information

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IPC IPC(8): C01B17/74
Inventor 周成明张志强
Owner 四川省犍为明丰化工有限公司
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