Method and device for co-producing gypsum powder through sulfuric acid production

A sulfuric acid production and gypsum powder technology, which is applied in the field of gypsum building materials, can solve the problems of energy waste, low economic value, and inability to produce, and achieve the effects of eliminating the source of danger of explosion, solving environmental pollution problems, and high heat energy utilization

Pending Publication Date: 2019-06-21
SICHUAN MIANZHU PANLONG MINERALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, boiler-made steam is generally used for the utilization of sulfuric acid production waste heat. The steam is used to drive the steam turbine to generate electricity and then used as a heat source for drying or concentration, or directly sold to other users, but the limitation is that when there is no device available for steam, Sulfuric acid cannot be produced due to high production costs, and the boiler is a dangerous special equipment with the risk of explosion. It is only used for power generation, not only has low economic value, but also has low thermal energy utilization efficiency, which will cause a considerable amount of energy waste. Currently, calcined phosphogypsum Natural gas is used as fuel, and the place without natural gas is limited, and the digestion route of phosphogypsum is also limited

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  • Method and device for co-producing gypsum powder through sulfuric acid production

Examples

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Effect test

Embodiment 1

[0032] A method for sulfuric acid production and co-production of gypsum powder, using phosphogypsum as a raw material, high-temperature sulfur dioxide gas produced by sulfuric acid production as a heat source, comprising the following preparation steps:

[0033] (1) Slurry the phosphogypsum, add milk of lime to the phosphogypsum slurry for modification until the pH value of the phosphogypsum slurry is 6, then carry out press filtration, vacuum filtration and centrifuge for the modified phosphogypsum slurry , and finally make the free water content in the filtered modified phosphogypsum less than 25%;

[0034] (2) Add the modified phosphogypsum obtained in the previous step into the fluidized bed, and at the same time, sulfur dioxide gas is introduced into the tube of the tubular heat exchanger, and the air is blown inward from the bottom of the fluidized bed, and the phosphogypsum is discharged from the tubular heat exchanger. Pass through the pipes and perform reverse heat e...

Embodiment 2

[0039] A method for co-producing gypsum powder with sulfuric acid, using phosphogypsum as a raw material, sulfur dioxide gas produced by sulfuric acid production as a heat source, comprising the following preparation steps:

[0040] (1) Slurry the phosphogypsum, add milk of lime to the phosphogypsum slurry for modification until the pH value of the phosphogypsum slurry is 9, then carry out pressure filtration, vacuum filtration and centrifuge for the modified phosphogypsum slurry , and finally make the free water content in the filtered modified phosphogypsum less than 25%;

[0041] (2) Add the modified phosphogypsum obtained in the previous step into the fluidized bed, and at the same time, sulfur dioxide gas is introduced into the tube of the tubular heat exchanger, and the air is blown inward from the bottom of the fluidized bed, and the phosphogypsum is discharged from the tubular heat exchanger. Pass through the tubes and perform reverse heat exchange with sulfur dioxide ...

Embodiment 3

[0046] A method for co-producing gypsum powder with sulfuric acid, using phosphogypsum as a raw material, sulfur dioxide gas produced by sulfuric acid production as a heat source, comprising the following preparation steps:

[0047] (1) Phosphogypsum is slurried, and alkaline industrial waste residue is added to the phosphogypsum slurry for modification until the pH value of the phosphogypsum slurry is 12, and the modified phosphogypsum slurry is successively subjected to pressure filtration, vacuum filtration and Centrifuge, finally make the free water content in the filtered modified phosphogypsum less than 25%;

[0048] (2) Add the modified phosphogypsum obtained in the previous step into the fluidized bed, and at the same time, sulfur dioxide gas is introduced into the tube of the tubular heat exchanger, and the air is blown inward from the bottom of the fluidized bed, and the phosphogypsum is discharged from the tubular heat exchanger. The pipes pass through and perform r...

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Abstract

The invention discloses a method and a device for co-producing gypsum powder through sulfuric acid production. Phosphogypsum serves as a raw material, and high-temperature sulfur dioxide gas generatedthrough sulfuric acid production serves as a heat source. The method comprises the following preparation steps: (1) performing paste mixing on the phosphogypsum, adding an alkaline material to perform modification and filtering the modified phosphogypsum paste for future use; and (2) adding the modified phosphogypsum obtained in the step (1) in a fluidized bed, introducing the high-temperature sulfur dioxide gas generated through sulfuric acid production into a tube of a tubular heat exchanger, blasting inwards from the bottom of the fluidized bed, enabling the phosphogypsum to pass through the tube of the tubular heat exchanger, performing heat exchange with the sulfur dioxide gas, and drying and calcining to obtain the gypsum powder. The afterheat generated by the sulfuric acid production can be directly utilized, conversion is not needed, heat energy is utilized completely and waste is avoided; meanwhile, the phosphogypsum is converted into the gypsum powder, zero emission of the phosphogypsum is realized, maximal utilization of two kinds of industrial byproduct and waste is realized, energy conservation and emission reduction are realized, and green circulation is realized.

Description

technical field [0001] The invention relates to the field of gypsum building materials, in particular to a method and device for producing and co-producing gypsum powder with sulfuric acid. Background technique [0002] Sulfuric acid production (including pyrite, sulfur concentrate and other smelting acid production and sulfuric acid production) will generate a lot of waste heat, and most of the production of phosphate needs to use sulfuric acid, so many factories are sulfuric acid and phosphorus chemical equipment Supporting construction, the by-product of phosphate products is phosphogypsum. The stacking of phosphogypsum not only takes up a lot of land resources, but also pollutes the atmosphere, water system and soil due to wind erosion and rain erosion, and the construction cost of phosphogypsum storage yard is also quite high. expensive. The main component of phosphogypsum is calcium sulfate crystals, which contain insoluble phosphorus, water-soluble phosphorus, fluori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/032
Inventor 郝付勇邓曲
Owner SICHUAN MIANZHU PANLONG MINERALS CO LTD
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