CN112279287A - Treatment process and treatment system for semi-dry desulfurized fly ash - Google Patents

Treatment process and treatment system for semi-dry desulfurized fly ash Download PDF

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Publication number
CN112279287A
CN112279287A CN202011108428.XA CN202011108428A CN112279287A CN 112279287 A CN112279287 A CN 112279287A CN 202011108428 A CN202011108428 A CN 202011108428A CN 112279287 A CN112279287 A CN 112279287A
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semi
dry
sulfuric acid
fly ash
reactor
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胡晓炜
彭伟
聂海金
张浩浩
黄康
万磊
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China City Environment Protection Engineering Ltd
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China City Environment Protection Engineering Ltd
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/46—Sulfates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/69—Sulfur trioxide; Sulfuric acid
    • C01B17/74—Preparation
    • C01B17/76—Preparation by contact processes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/46—Sulfates
    • C01F11/466—Conversion of one form of calcium sulfate to another
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B11/00—Calcium sulfate cements
    • C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B11/00—Calcium sulfate cements
    • C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
    • C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
    • C04B11/264—Gypsum from the desulfurisation of flue gases

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Treating Waste Gases (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses a treatment process and a treatment system for semi-dry desulfurized fly ash, and relates to the technical field of desulfurized fly ash recovery treatment. By utilizing the technology of the synergy of the semi-dry desulfurization ash treatment and the acid making process of a steel mill, on one hand, sulfuric acid is adopted as a wet treatment agent of the semi-dry desulfurization ash, and unstable calcium sulfite in the semi-dry desulfurization ash is converted into stable calcium sulfate for later-stage resource utilization; on the other hand, the by-product SO generated in the wet treatment of the semi-dry desulfurized fly ash2The method can be used as a raw material for preparing acid to realize the reuse of byproducts.

Description

Treatment process and treatment system for semi-dry desulfurized fly ash
Technical Field
The invention relates to the technical field of desulfurized fly ash recovery treatment, in particular to a treatment process and a treatment system for semidry desulfurized fly ash.
Background
The semi-dry desulfurization technology has the characteristics of mature technology, simple process flow, high system reliability and the like, and becomes one of the main desulfurization technologies of the sintering technology of a steel mill. The desulfurization by-product produced by the technique is in dry powder form and mainly comprises CaSO3、CaCO3、CaO、CaSO4And a small amount of incompletely reacted absorbent (Ca (OH)2) And the like. Because the calcium sulfite is high in calcium and sulfur and the unstable calcium sulfite is mainly used as the component (accounting for more than 50 percent), the direct resource utilization is difficult. At present, the common treatment modes of iron and steel enterprises are stacking and landfill, and secondary pollution to the environment is very easy to cause.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a treatment process and a treatment system for semi-dry desulfurized fly ash to solve the technical problems.
The invention is realized by the following steps:
a treatment process of semi-dry desulfurized fly ash comprises the following steps: introducing semidry desulfurization ash into a reactor to react with sulfuric acid, introducing a gaseous product after reaction into acid making equipment to prepare sulfuric acid, and preparing calcium sulfate from a residual product after reaction;
the sulfuric acid prepared by the acid preparation equipment is introduced into the reactor to continuously carry out the circulating reaction with the semi-dry desulfurization ash.
The inventor creatively provides a synergistic technology of semi-dry desulfurization ash treatment and acid preparation. On one hand, the wet treatment of the semi-dry desulfurized fly ash is realized by utilizing the reactor, so that CaSO in the semi-dry desulfurized fly ash3、CaCO3、CaO、CaSO4And a small amount of incompletely reacted absorbent (Ca (OH)2) And the like react to generate calcium sulfate, and on the other hand, the gaseous product obtained by reacting the semidry desulfurization ash with the sulfuric acid is used for preparing the sulfuric acid by using acid-making equipment. The gaseous product contains sulfur dioxide, the preparation of the sulfuric acid can be realized by utilizing acid making equipment, the prepared sulfuric acid can be directly sent back to the reactor for wet treatment of semi-dry desulfurization ash, or sent back to a semi-dry desulfurization ash bin to be used as the desulfurization ashPneumatic conveying agent for raising SO in gas by circulation2The concentration can reduce the cost of the subsequent acid making process.
The semi-dry desulfurization ash treatment and the steel mill acid making process are organically cooperated, so that the resource utilization of the semi-dry desulfurization ash and the process by-products is realized to the maximum extent.
The semidry desulfurized fly ash can react with sulfuric acid as follows:
CaSO3+H2SO4→CaSO4+H2O+SO2↑
CaCO3+H2SO4→CaSO4+H2O+CO2↑
Ca(OH)2+H2SO4→CaSO4+2H2O
CaO+H2SO4→CaSO4+H2O
unstable substances such as CaSO in semidry desulfurized fly ash by the above reaction3And other substances are converted into the relatively stable CaSO4(Gypsum) can be used for manufacturing building materials such as cement and gypsum boards. However, according to the national standards, both cement and gypsum have control requirements on the content of chloride ions, so that the embodiment provided by the invention also controls the content of chloride ions in the final solid reactant by regulating and controlling the reaction conditions.
In the invention, the sulfuric acid is used as a solvent for dissolving the semi-dry desulfurized fly ash and is also used as a reactant in the treatment process of the semi-dry desulfurized fly ash.
In one embodiment, the sulfuric acid is stably fed into the reactor by an acid liquid pump.
In one embodiment, the reactor is set as a stirring reaction device, and the dissolving and the pulping of the semi-dry desulfurization ash are realized in the reactor through the rotation of the stirrer and a stainless steel shaft.
The semi-dry desulfurized fly ash also begins to react with the sulfuric acid during the dissolving and pulping process. Calcium sulfate slightly soluble in water, gas sulfur dioxide and the like are generated in the reaction. The calcium sulfate slurry is separated from the bottom section of the reactor. The gas sulfur dioxide generated by the reaction is separated out through the upper part of the reactor and then is pumped to a purification section of steel mill acid making through a diaphragm pump.
In a preferred embodiment of the invention, the acid making equipment is steel mill acid making equipment, and the gaseous product after reaction is introduced into purification equipment for purification, and then is subjected to catalytic conversion and absorption by absorption equipment to prepare sulfuric acid;
in the treatment process, the initial source of the sulfuric acid is sulfuric acid prepared from sulfur dioxide obtained by burning or desorbing byproducts in a steel mill;
preferably, the by-product in the steel mill is desulfurized waste salt, coked desulfurized waste liquid or gas obtained by resolving active coke.
The by-products of steel mill production process, such as desulfurized waste salt, coking desulfurized waste liquid and gas after active coke desorption, can be used as sulfide source for preparing sulfuric acid. The sulfuric acid is prepared by incineration, purification, catalytic conversion and absorption.
In the preferred embodiment of the invention, the ratio of the liquid volume to the solid mass of the mixture of the sulfuric acid and the semi-dry desulfurized fly ash in the reactor is 1-20: 1.
the inventor finds that: when the liquid-solid ratio of the sulfuric acid to the semidry desulfurization ash is kept at 1-20:1 and the sulfuric acid is at the concentration, the residual rates of sulfite radicals and chloride ions in the reaction solid product are the lowest, and the reaction time is the shortest. Under the liquid-solid ratio, the full reaction of reactants can be met, the maximum recycling of the semi-dry desulfurization ash is realized, and the high-efficiency output and subsequent standard application of reaction products sulfide and calcium sulfate can be met.
In a preferred embodiment of the present invention, the concentration of the sulfuric acid is 5-20%.
The above ranges provided by the present invention refer to the concentration of sulfuric acid in the semi-dry desulfurized fly ash, and in other embodiments, the sulfuric acid may be selected from dilute sulfuric acid, and the concentration is lower than (70%).
Under the condition of the fed sulfuric acid ratio in the range, the reaction progress degree of reactants can be effectively improved, so that the reaction is carried out towards the direction of a target product.
In a preferred embodiment of the present invention, the treatment process further includes centrifuging the remaining product after the reaction to obtain a solid product calcium sulfate.
In other embodiments, the necessity of the centrifugation process may also be adaptively selected as desired.
In a preferred embodiment of the present invention, the treatment process further comprises subjecting the centrifuged solid product to pressure filtration, and pulverizing the obtained filter cake.
In one embodiment, the centrifuged solid product is pressure filtered using a plate and frame filter press to remove water from the solids.
In a preferred embodiment of the present invention, the treatment process further comprises adjusting the pH of the pulverized product, and drying to obtain gypsum;
preferably, the pH of the crushed product is adjusted to 5-9.
In one embodiment, Ca (OH) is used2The pH value is adjusted.
A treatment system of semi-dry desulfurization ash comprises a reactor, a semi-dry desulfurization ash bin, a purification device, a catalytic conversion device and an absorption device; one end of a feed inlet of the reactor is communicated with the semidry desulfurization ash bin, a gas outlet of the reactor is communicated with the purifying device, the catalytic conversion device and the absorption device in sequence, and an acid liquor outlet of the absorption device is communicated with the reactor to form a circulation loop.
In a preferred embodiment of the present invention, the bottom end of the reactor is in communication with a centrifuge.
In order to facilitate feeding, a feeding device is arranged between the reactor and the semi-dry desulfurization ash bin, and a screw feeder can be adopted to realize uniform feeding of semi-dry desulfurization ash powder, so that the desulfurization ash is quantitatively and stably fed into the reactor (rotary reaction kettle).
The invention has the following beneficial effects:
the invention provides a treatment process and a treatment system for semi-dry desulfurized fly ash, which utilize the technology of the synergy of the semi-dry desulfurized fly ash treatment and the acid making technology, on one hand, sulfuric acid is adopted as a wet treatment agent for the semi-dry desulfurized fly ash, and the semi-dry desulfurized fly ash is treatedThe unstable calcium sulfite in the calcium sulfate is converted into stable calcium sulfate for later-stage resource utilization; on the other hand, the by-product SO generated in the wet treatment of the semi-dry desulfurized fly ash2The method can be used as a raw material for preparing acid to realize the reuse of byproducts.
The invention organically coordinates the treatment of the semi-dry desulfurization ash with the acid making system, thereby effectively reducing the operation cost of steel mill acid making and the treatment of the semi-dry desulfurization ash. The treatment process and the treatment system provided by the invention are beneficial to providing a new resource utilization way for semi-dry desulfurization ash, can realize the reutilization of industrial byproducts by utilizing the existing equipment, and play a certain role in promoting the popularization of the semi-dry desulfurization technology.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a process diagram of the treatment of semi-dry desulfurized fly ash provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
Referring to fig. 1, the present embodiment provides a treatment process and a treatment system for semi-dry desulfurized fly ash. The method comprises the following steps of:
(1) and (4) feeding.
Conveying the semi-dry desulfurization product desulfurization ash of the steel mill sintering process into a semi-dry desulfurization ash bin in a vehicle-mounted mode and the like. And a feeding device is arranged at the outlet of the desulfurization ash bin, and the adoption of the screw feeder is helpful for realizing uniform feeding of semi-dry desulfurization ash powder and ensuring that the desulfurization ash is quantitatively and stably fed into a reactor (a rotary reaction kettle). The semi-dry desulfurization ash bin is provided with a seal and can be used for containing SO after reaction2And prevents other gases from entering the diluted final SO2The concentration of (c).
(2) Pulping.
In this example, the feed concentration of dilute sulfuric acid was 5%.
The dilute sulfuric acid is used as a solvent for dissolving the semi-dry desulfurized fly ash and is also used as a reactant in the treatment process of the semi-dry desulfurized fly ash. Dilute sulfuric acid is fed stably into the reactor by means of an acid liquid pump.
The liquid-solid ratio of the dilute sulfuric acid to the semidry desulfurization ash is 8: 1. The dissolving and pulping of the semi-dry desulfurization ash are realized in the reactor through the rotation of the stirrer and the stainless steel shaft.
(3) And (4) reacting.
The semi-dry desulfurized fly ash also begins to react with dilute sulfuric acid in the process of dissolving and pulping. Calcium sulfate slightly soluble in water and gas SO are generated in the reaction2And the like. Wherein the calcium sulfate slurry is separated from the bottom section of the reactor. Gas SO generated by reaction2Separated out through the upper end of the reactor and then pumped to a purification section of steel plant acid making through a diaphragm pump. The preparation of the sulfuric acid is realized in the acid making section of a steel mill. The reaction time is about 15min, and the reaction can be completed.
(4) Preparing gypsum.
Discharging reacted slurry containing calcium sulfate from the reactor, centrifuging by using centrifugal equipment to obtain a solid product, and then performing filter pressing by using a plate-and-frame filter press to remove water in the solid. The filter cake is crushed by a crusher and a small amount of Ca (OH) is added2And adjusting the pH value to enable the pH value of the final product to be 5-9, and drying to obtain gypsum for later-stage building material manufacturing. The content of sulphite (in the form of calcium sulphate hemihydrate) in the dry gypsum is less than 0.5%.
(5) And (5) preparing acid.
More than 8 percent of SO is contained in the released gas in the reaction process of semidry desulfurization ash and dilute sulfuric acid2And the sulfuric acid is pumped to the existing acid making device of a steel mill through a diaphragm pump to prepare sulfuric acid.
After gaseous product sulfur dioxide in the stirring reaction equipment enters purification equipment to filter impurities, the gaseous product sulfur dioxide is sequentially subjected to catalytic conversion in an acid making section of a steel mill and absorption by absorption equipment to obtain sulfuric acid, and the prepared sulfuric acid flows into the stirring reaction equipment again through an acid liquid pump to participate in the reaction of semi-dry desulfurization ash.
In this example, the sulfide raw material of the acid making apparatus is derived from the product of the combustion of the desulfurized waste salt by the incineration apparatus.
Example 2
The embodiment provides a treatment process of semi-dry desulfurized fly ash. The method comprises the following steps of:
(1) and (4) feeding.
Conveying the semi-dry desulfurization product desulfurization ash of the steel mill sintering process into a semi-dry desulfurization ash bin in a vehicle-mounted mode and the like. And a feeding device is arranged at the outlet of the desulfurization ash bin, and the adoption of the screw feeder is helpful for realizing uniform feeding of semi-dry desulfurization ash powder and ensuring that the desulfurization ash is quantitatively and stably fed into a reactor (a rotary reaction kettle). The semi-dry desulfurization ash bin is provided with a seal for containing SO after reaction2And prevents other gases from entering the diluted final SO2The concentration of (c).
(2) Pulping.
In this embodiment, the feed concentration of the dilute sulfuric acid is 8%, and the dilute sulfuric acid is used as a solvent for dissolving the semidry desulfurized fly ash and is also used as a reactant in the treatment process of the semidry desulfurized fly ash. Dilute sulfuric acid is fed stably into the reactor by means of an acid liquid pump.
The liquid-solid ratio of the dilute sulfuric acid to the semidry desulfurization ash is 10: 1. The dissolving and pulping of the semi-dry desulfurization ash are realized in the reactor through the rotation of the stirrer and the stainless steel shaft.
(3) And (4) reacting.
The semi-dry desulfurized fly ash also begins to react with dilute sulfuric acid in the process of dissolving and pulping. Is in the middle of reactionSparingly water-soluble calcium sulfate and gaseous SO2And the like. Wherein the calcium sulfate slurry is separated from the bottom section of the reactor. Gas SO generated by reaction2Separated out through the upper end of the reactor and then pumped to a purification section of steel plant acid making through a diaphragm pump. The preparation of the sulfuric acid is realized in the acid making section of a steel mill. The reaction time is 10min, and the reaction time is shortest.
(4) Preparing gypsum.
Discharging reacted slurry containing calcium sulfate from the reactor, centrifuging by using centrifugal equipment to obtain a solid product, and then performing filter pressing by using a plate-and-frame filter press to remove water in the solid. The filter cake is crushed by a crusher and a small amount of Ca (OH) is added2And adjusting the pH value to enable the pH value of the final product to be 5-9, and drying to obtain gypsum for later-stage building material manufacturing. The content of calcium sulfate dihydrate in the dry gypsum is higher than 85 percent, and the content of chloride ions is the lowest and is lower than 380 mg/kg.
(5) And (5) preparing acid.
The gas released in the reaction process of the semidry desulfurization ash and dilute sulfuric acid contains more than 10 percent of SO2And the sulfuric acid is pumped to the existing acid making device of a steel mill through a diaphragm pump to prepare sulfuric acid.
After gaseous product sulfur dioxide in the stirring reaction equipment enters purification equipment to filter impurities, the gaseous product sulfur dioxide is sequentially subjected to catalytic conversion in an acid making section of a steel mill and absorption by absorption equipment to obtain sulfuric acid, and the prepared sulfuric acid flows into the stirring reaction equipment again through an acid liquid pump to participate in the reaction of semi-dry desulfurization ash.
In this example, the sulfide raw material of the acid production apparatus is derived from a product of combustion of the desulfurization waste liquid by the incineration apparatus.
Example 3
The embodiment provides a treatment process of semi-dry desulfurized fly ash. The method comprises the following steps of:
(1) and (4) feeding.
Conveying the semi-dry desulfurization product desulfurization ash of the steel mill sintering process into a semi-dry desulfurization ash bin in a vehicle-mounted mode and the like. And a feeding device is arranged at the outlet of the desulfurization ash bin, and the adoption of the screw feeder is helpful for realizing uniform feeding of semi-dry desulfurization ash powder and ensuring that the desulfurization ash is quantitatively and stably fed into a reactor (a rotary reaction kettle). The semi-dry desulfurization ash bin is provided with a seal, and 50% of generated gas is returned to the semi-dry desulfurization ash bin through a diaphragm pump to be used as carrier gas in the embodiment.
(2) Pulping.
In this example, the feed concentration of dilute sulfuric acid was 10%.
The dilute sulfuric acid is used as a solvent for dissolving the semi-dry desulfurized fly ash and is also used as a reactant in the treatment process of the semi-dry desulfurized fly ash. Dilute sulfuric acid is fed stably into the reactor by means of an acid liquid pump.
The liquid-solid ratio of the dilute sulfuric acid to the semidry desulfurization ash is 12: 1. The dissolving and pulping of the semi-dry desulfurization ash are realized in the reactor through the rotation of the stirrer and the stainless steel shaft.
(3) And (4) reacting.
The semi-dry desulfurized fly ash also begins to react with dilute sulfuric acid in the process of dissolving and pulping. Calcium sulfate slightly soluble in water and gas SO are generated in the reaction2And the like. Wherein the calcium sulfate slurry is separated from the bottom section of the reactor. Gas SO generated by reaction2Separated out through the upper end of the reactor and then pumped to a purification section of steel plant acid making through a diaphragm pump. The preparation of the sulfuric acid is realized in the acid making section of a steel mill.
(4) Preparing gypsum.
Discharging reacted slurry containing calcium sulfate from the reactor, centrifuging by using centrifugal equipment to obtain a solid product, and then performing filter pressing by using a plate-and-frame filter press to remove water in the solid. The filter cake is crushed by a crusher and a small amount of Ca (OH) is added2And adjusting the pH value to enable the pH value of the final product to be 5-9, and drying to obtain gypsum for later-stage building material manufacturing.
(5) And (5) preparing acid.
Through the circulation, the gas released in the reaction process of the semidry desulfurization ash and the dilute sulfuric acid contains more than 12 percent of SO2And the sulfuric acid is pumped to the existing acid making device of a steel mill through a diaphragm pump to prepare sulfuric acid.
After gaseous product sulfur dioxide in the stirring reaction equipment enters purification equipment to filter impurities, the gaseous product sulfur dioxide is sequentially subjected to catalytic conversion in an acid making section of a steel mill and absorption by absorption equipment to obtain sulfuric acid, and the prepared sulfuric acid flows into the stirring reaction equipment again through an acid liquid pump to participate in the reaction of semi-dry desulfurization ash.
In this example, the sulfide raw material of the acid production apparatus was derived from the gas obtained by the desorption of the activated coke.
The invention organically coordinates the treatment of the semi-dry desulfurization ash with the acid making system, thereby effectively reducing the operation cost of steel plant acid making and the treatment of the semi-dry desulfurization ash. Through the implementation, a resource utilization way is provided for the semi-dry desulfurization ash, and the popularization of the semi-dry desulfurization technology is promoted to a certain extent.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The treatment process of the semi-dry desulfurized fly ash is characterized by comprising the following steps of: introducing semidry desulfurization ash into a reactor to react with sulfuric acid, introducing a gaseous product after reaction into acid making equipment to prepare sulfuric acid, and preparing calcium sulfate from a residual product after reaction;
the sulfuric acid prepared by the acid preparation equipment is introduced into the reactor to continuously carry out the circulating reaction with the semi-dry desulfurization ash.
2. The treatment process of semi-dry desulfurized fly ash according to claim 1, wherein in the treatment process, the acid production equipment is steel mill acid production equipment, and the gaseous product after the reaction is purified by introducing into purification equipment, and then is absorbed by catalytic conversion and absorption equipment to obtain sulfuric acid;
preferably, the initial source of sulfuric acid is sulfuric acid produced from sulfur dioxide obtained by combustion or desorption of by-products in a steel mill;
preferably, the by-product in the steel mill is desulfurized waste salt, coking desulfurized waste liquid or gas after desorption of active coke.
3. The process for treating semi-dry desulfurized fly ash according to claim 1, wherein the ratio of the liquid volume to the solid mass of the mixture of sulfuric acid and semi-dry desulfurized fly ash in said reactor is 1-20: 1.
4. the process for treating semi-dry desulfurized fly ash according to claim 3, wherein the concentration of said sulfuric acid is 5-20%.
5. The treatment process of semi-dry desulfurized fly ash according to claim 1, further comprising centrifuging the remaining product after said reaction to obtain a solid product calcium sulfate.
6. The treatment process of semi-dry desulfurized ash according to claim 5, further comprising the steps of pressure-filtering the centrifuged solid product and pulverizing the obtained filter cake.
7. The treatment process of semi-dry desulfurized fly ash according to claim 6, further comprising adjusting the pH of the pulverized product and drying to obtain gypsum.
8. The treatment process of the semi-dry desulfurized fly ash according to claim 7, wherein the pH of the pulverized product is adjusted to 5 to 9.
9. The system for treating the semi-dry desulfurization ash is characterized by comprising a reactor, a semi-dry desulfurization ash bin, a purifying device, a catalytic conversion device and an absorption device; one end of a feed inlet of the reactor is communicated with the semidry desulfurization ash bin, a gas outlet is formed in the reactor and is sequentially communicated with the purifying device, the catalytic conversion device and the absorption device, and an acid liquor outlet of the absorption device is communicated with the reactor to form a circulation loop.
10. The system for treating semi-dry desulfurized ash according to claim 9, wherein the bottom end of said reactor is in communication with a centrifugal device.
CN202011108428.XA 2020-10-16 2020-10-16 Treatment process and treatment system for semi-dry desulfurized fly ash Pending CN112279287A (en)

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CN113636574A (en) * 2021-07-14 2021-11-12 中南大学 Method for preparing sulfur-containing chemical products by resource utilization of semi-dry desulfurization ash

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CN110436506A (en) * 2019-08-14 2019-11-12 东北大学 Using industrial waste sulfuric acid to the method for semi-dry desulphurization ash oxidation processes

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Publication number Priority date Publication date Assignee Title
CN101623592A (en) * 2009-07-31 2010-01-13 攀枝花新钢钒股份有限公司 Process for comprehensively treating waste acid and desulfurization ash
CN110436506A (en) * 2019-08-14 2019-11-12 东北大学 Using industrial waste sulfuric acid to the method for semi-dry desulphurization ash oxidation processes

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113636574A (en) * 2021-07-14 2021-11-12 中南大学 Method for preparing sulfur-containing chemical products by resource utilization of semi-dry desulfurization ash
CN113636574B (en) * 2021-07-14 2022-09-09 中南大学 Method for preparing sulfur-containing chemical products by resource utilization of semi-dry desulfurization ash

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