CN111994915A - Method and device for producing sodium silicate and sulfuric acid from high-sulfur-content salt - Google Patents
Method and device for producing sodium silicate and sulfuric acid from high-sulfur-content salt Download PDFInfo
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- CN111994915A CN111994915A CN202010888165.2A CN202010888165A CN111994915A CN 111994915 A CN111994915 A CN 111994915A CN 202010888165 A CN202010888165 A CN 202010888165A CN 111994915 A CN111994915 A CN 111994915A
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- sulfur
- sodium silicate
- sulfuric acid
- salt
- flue gas
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 150000003839 salts Chemical class 0.000 title claims abstract description 34
- 239000004115 Sodium Silicate Substances 0.000 title claims abstract description 33
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910052911 sodium silicate Inorganic materials 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003546 flue gas Substances 0.000 claims abstract description 41
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 39
- 239000011593 sulfur Substances 0.000 claims abstract description 39
- 238000010521 absorption reaction Methods 0.000 claims abstract description 37
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 28
- 239000001301 oxygen Substances 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000003723 Smelting Methods 0.000 claims abstract description 18
- 239000000428 dust Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 238000002485 combustion reaction Methods 0.000 claims abstract description 16
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 12
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 12
- 239000000446 fuel Substances 0.000 claims abstract description 9
- 238000002844 melting Methods 0.000 claims description 21
- 230000008018 melting Effects 0.000 claims description 21
- 239000002912 waste gas Substances 0.000 claims description 12
- 230000003197 catalytic effect Effects 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 239000002910 solid waste Substances 0.000 abstract description 7
- 238000002360 preparation method Methods 0.000 abstract description 4
- 239000002440 industrial waste Substances 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000009270 solid waste treatment Methods 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 8
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/32—Alkali metal silicates
-
- 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
- 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
- C01B17/80—Apparatus
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a method and a device for producing sodium silicate and sulfuric acid by using high-sulfur-content salt, belonging to the technical field of industrial solid waste treatment; the problem that industrial miscellaneous salt solid waste is not easy to recycle is solved; the method comprises the following steps of (1) carrying out oxy-fuel combustion on sulfur-containing industrial miscellaneous salts and silicon dioxide to prepare sodium silicate, and carrying out heat exchange, dust removal, conversion and absorption on sulfur-containing flue gas generated in the preparation process to generate sulfuric acid; the adopted device comprises a total oxygen smelting furnace, a block making cooling device, a heat exchange device, a conversion tower and an absorption tower, wherein a discharge port of the total oxygen smelting furnace is connected with the block making cooling device, and a flue gas outlet of the total oxygen smelting furnace is sequentially connected with the heat exchange device, the conversion tower and the absorption tower; the invention uses the high sulfur-containing salt as the raw material to produce the sodium silicate, and simultaneously uses the flue gas generated in the process of producing the sodium silicate to produce the sulfuric acid, thereby effectively utilizing the sulfur-containing industrial waste salt and solving the problem of solid waste recovery of the industrial sulfur-containing waste salt.
Description
Technical Field
The invention belongs to the technical field of industrial solid waste treatment, and particularly relates to a method and a device for producing sodium silicate and sulfuric acid from high-sulfur-content salt.
Background
In the production process of coke and downstream products, a large amount of industrial sulfur-containing miscellaneous salt is generated, the content of the industrial sulfur-containing miscellaneous salt is about 75 percent, and new environmental protection problems can be caused by improper treatment of the salt. The existing environment-friendly treatment method can be used for treating sulfur-containing flue gas and high-concentration salt, and pollutants generated after the sulfur-containing flue gas is treated are transferred to desulfurization wastewater or form solid waste from the flue gas and are output in the form of wastewater or gypsum; the high-concentration salt can crystallize out the pollutants dissolved in the wastewater through processes such as dissolution, evaporation and crystallization and the like, and is output in the form of solid waste. The above treatment methods all belong to converting pollutants from one form to another form, but do not completely eliminate the pollutants, and cannot fundamentally realize the 'zero emission' of environmental protection.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a method and a device for producing sodium silicate and sulfuric acid by using high-sulfur salt. Solves the problem that the industrial miscellaneous salt solid waste is not easy to recycle.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
A method for producing sodium silicate and sulfuric acid from high-sulfur salt comprises the following steps of preparing raw materials from 60-80% of sulfur-containing industrial miscellaneous salt and 20-40% of silicon dioxide in percentage by mass; the method comprises the following steps:
a) carrying out oxy-fuel combustion melting on the raw materials, wherein the melting temperature is 1400-1600 ℃;
b) cooling and molding the obtained molten product to prepare sodium silicate;
c) the sulfur-containing flue gas generated in the combustion process is cooled to 150-200 ℃, and then enters a conversion tower to reduce the sulfur-containing flue gasSO in gas2Conversion to SO3Then passing SO through an absorption tower3By H2And absorbing the O to prepare sulfuric acid.
Preferably, the raw material consists of 75 mass percent of sulfur-containing industrial miscellaneous salt and 25 mass percent of silicon dioxide.
Preferably, the flue gas discharged from the absorption tower enters the waste gas treatment equipment, and is discharged after being subjected to catalytic absorption.
Preferably, the sulfur-containing flue gas cooled to 150-200 ℃ is dedusted by dedusting equipment and then enters the conversion tower.
A device for producing sodium silicate and sulfuric acid by using high-sulfur-content salt comprises a total oxygen smelting furnace, a block making device, a cooling device, a heat exchange device, a conversion tower and an absorption tower, wherein a discharge port of the total oxygen smelting furnace is connected with the block making device and the cooling device, and a flue gas outlet of the total oxygen smelting furnace is sequentially connected with the heat exchange device, the conversion tower, the absorption tower and a waste gas treatment facility; the temperature in the total oxygen melting furnace is 1400-1600 ℃; the total oxygen smelting furnace is used for a site for total oxygen combustion of a mixture of sulfur-containing industrial miscellaneous salts and silicon dioxide; the block making and cooling device is used for molding and cooling a product generated after the raw materials of the total oxygen smelting furnace are melted to prepare sodium silicate; the conversion tower is used for converting SO in the flue gas2Conversion to SO3(ii) a The absorption tower is used for absorbing SO in the flue gas3By H2And absorbing the O to prepare sulfuric acid.
Furthermore, the device also comprises a dust removal device, and the dust removal device is connected between the heat exchange device and the conversion tower.
Furthermore, the device also comprises an exhaust gas treatment device, and the exhaust gas treatment device is connected with the smoke outlet of the absorption tower through a pipeline.
Compared with the prior art, the invention has the beneficial effects that.
The invention uses the high sulfur-containing salt as the raw material to produce the sodium silicate, and simultaneously uses the flue gas generated in the process of producing the sodium silicate to produce the sulfuric acid, thereby effectively utilizing the sulfur-containing industrial waste salt and solving the problem of solid waste recovery of the industrial sulfur-containing waste salt.
Drawings
FIG. 1 is a schematic structural diagram of a device for producing sodium silicate and sulfuric acid from high-sulfur salt according to the invention.
Wherein, 1 is a total oxygen smelting furnace, 2 is a steam boiler, 3 is dust removal equipment, 4 is a converter, 5 is an absorption tower, 6 is a waste gas treatment device, 7 is a chimney, 8 is blocking equipment, 9 is a cooling conveyer belt, 10 is a flue gas induced draft fan, and 11 is sodium silicate.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
Example 1
As shown in fig. 1, the device for producing sodium silicate and sulfuric acid from high-sulfur-content salt comprises a total oxygen melting furnace 1, a block making device 8, a steam boiler 2, a dust removing device 3, a conversion tower 4 and an absorption tower 5, wherein a discharge port of the total oxygen melting furnace 1 is connected with the block making device 8, and a cooling conveyer belt 9 is arranged below a blanking port of the block making device 8; the smoke outlet of the total oxygen smelting furnace 1 is connected with a steam boiler 2, a dust removing device 3, a conversion tower 4 and an absorption tower 5 in sequence; the temperature in the total oxygen melting furnace 1 is 1400-1600 ℃; the total oxygen smelting furnace 1 is used for performing total oxygen combustion on a mixture of sulfur-containing industrial miscellaneous salts and silicon dioxide; the briquetting equipment 8 and the cooling conveyer belt 9 are used for cooling and forming products generated after the combustion of the total oxygen smelting furnace 1 to prepare sodium silicate; the steam boiler 2 is used for carrying out heat exchange and cooling on the flue gas discharged from the total oxygen smelting furnace 1, and the dust removal equipment 3 is used for carrying out dust removal treatment on the flue gas subjected to heat exchange by the steam boiler 2; the conversion tower 4 is used for converting SO in the flue gas2Conversion to SO3(ii) a The absorption tower 5 is used for absorbing SO in the flue gas3By H2And absorbing the O to prepare sulfuric acid. The exhaust port of the absorption tower 5 is connected with a waste gas treatment device 6 through a pipeline, the waste gas treatment device 6 treats exhausted gas through catalytic absorption, and the waste gas treatment device 6 is connected with a chimney 7.
The method for producing sodium silicate and sulfuric acid by using the high-sulfur salt prepared by the equipment comprises the following steps of preparing raw materials by using 60 mass percent of sulfur-containing industrial miscellaneous salt and 40 mass percent of silicon dioxide; the method comprises the following specific steps:
a) carrying out oxy-fuel combustion melting on the raw materials in an oxy-fuel melting furnace 1, wherein the melting and burning temperature is 1400 ℃;
b) cooling and forming the obtained molten product by a briquetting device 8 and a cooling conveyer belt 9 to prepare sodium silicate 11;
c) the sulfur-containing flue gas generated in the combustion process is cooled to 200 ℃ through heat exchange of the steam boiler 2, the flue gas subjected to heat exchange of the steam boiler 2 is subjected to dust removal treatment by the dust removal equipment 3, and then enters the conversion tower 4 to remove SO in the sulfur-containing flue gas2Conversion to SO3Then SO is passed through an absorption tower 53By H2And absorbing the O to prepare sulfuric acid. The flue gas discharged from the absorption tower 5 is discharged to the atmosphere through a chimney 7 by the catalytic absorption of a waste gas treatment device 6.
The flue gas enters a conversion tower 4 after being dedusted to remove SO2Is charged to SO3The conversion rate is 99.5 percent, and then the SO enters an absorption tower 5 to be treated3By H2O is absorbed to 93% H2SO4The absorption rate was 99.6%. About 10 ten thousand tons of industrial miscellaneous salt solid waste can simultaneously produce 3 ten thousand tons of sodium silicate and a byproduct of 2.9 ten thousand tons of 93 percent sulfuric acid.
Example 2
The apparatus in this example is the same as example 1, and the preparation method is as follows: the raw material consists of 75 percent of industrial miscellaneous salt containing sulfur and 25 percent of silicon dioxide by mass percentage; the method comprises the following specific steps:
a) carrying out total oxygen melting on the raw materials in a total oxygen melting furnace 1, wherein the melting temperature is 1600 ℃;
b) cooling and forming the obtained molten product by a briquetting device 8 and a cooling conveyer belt 9 to prepare sodium silicate 11;
c) the sulfur-containing flue gas generated in the combustion process is cooled to 150 ℃ through heat exchange of the steam boiler 2, the flue gas subjected to heat exchange of the steam boiler 2 is subjected to dust removal treatment by the dust removal equipment 3, and then enters the conversion tower 4 to remove SO in the sulfur-containing flue gas2Conversion to SO3Then SO is passed through an absorption tower 53By H2And absorbing the O to prepare sulfuric acid. The flue gas discharged from the absorption tower 5 passes through a waste gas treatment deviceThe catalytic absorption of 6 is discharged to the atmosphere via a stack 7.
Example 3
The apparatus in this example is the same as example 1, and the preparation method is as follows: the raw material consists of 80 percent of sulfur-containing industrial miscellaneous salt and 20 percent of silicon dioxide by mass percentage; the method comprises the following specific steps:
a) carrying out oxy-fuel combustion melting on the raw materials in an oxy-fuel melting furnace 1, wherein the melting temperature is 1500 ℃;
b) cooling and forming the obtained molten product by a briquetting device 8 and a cooling conveyer belt 9 to prepare sodium silicate 11;
c) the sulfur-containing flue gas generated in the combustion process is cooled to 170 ℃ through heat exchange of the steam boiler 2, the flue gas subjected to heat exchange of the steam boiler 2 is subjected to dust removal treatment by the dust removal equipment 3, and then enters the conversion tower 4 to remove SO in the sulfur-containing flue gas2Conversion to SO3Then SO is passed through an absorption tower 53By H2And absorbing the O to prepare sulfuric acid. The flue gas discharged from the absorption tower 5 is discharged to the atmosphere through a chimney 7 by the catalytic absorption of a waste gas treatment device 6.
Example 4
The apparatus in this example is the same as example 1, and the preparation method is as follows: the raw material consists of 75 percent of industrial miscellaneous salt containing sulfur and 25 percent of silicon dioxide by mass percentage; the method comprises the following specific steps:
a) carrying out oxy-fuel combustion melting on the raw materials in an oxy-fuel melting furnace 1, wherein the melting temperature is 1500 ℃;
b) cooling and forming the obtained molten product by a briquetting device 8 and a cooling conveyer belt 9 to prepare sodium silicate 11;
c) the sulfur-containing flue gas generated in the combustion process is cooled to 200 ℃ through heat exchange of the steam boiler 2, the flue gas subjected to heat exchange of the steam boiler 2 is subjected to dust removal treatment by the dust removal equipment 3, and then enters the conversion tower 4 to remove SO in the sulfur-containing flue gas2Conversion to SO3Then SO is passed through an absorption tower 53By H2And absorbing the O to prepare sulfuric acid. The flue gas discharged from the absorption tower 5 is discharged to the atmosphere through a chimney 7 by the catalytic absorption of a waste gas treatment device 6.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The method for producing sodium silicate and sulfuric acid by using high-sulfur-content salt is characterized by that its raw material is formed from (by mass%) 60-80% of sulfur-containing industrial miscellaneous salt and 20-40% of silicon dioxide; the method comprises the following steps:
a) carrying out oxy-fuel combustion melting on the raw materials, wherein the melting temperature is 1400-1600 ℃;
b) cooling and molding the obtained molten product to prepare sodium silicate;
c) cooling the sulfur-containing flue gas generated in the combustion process to 150-2Conversion to SO3Then passing SO through an absorption tower3By H2And absorbing the O to prepare sulfuric acid.
2. The method for producing sodium silicate and sulfuric acid with high sulfur content according to claim 1, wherein the raw material consists of 75 mass percent of sulfur-containing industrial miscellaneous salt and 25 mass percent of silicon dioxide.
3. The method for producing sodium silicate and sulfuric acid from high sulfur-containing salt according to claim 1, wherein the flue gas discharged from the absorption tower enters a waste gas treatment device, and is discharged after being subjected to catalytic absorption.
4. The method for producing sodium silicate and sulfuric acid with high sulfur content according to claim 1, wherein the sulfur-containing flue gas cooled to 150-200 ℃ is dedusted by dedusting equipment and enters the converter.
5. The device for producing sodium silicate and sulfuric acid by using high-sulfur salt is characterized by comprising a total oxygen smelting furnace, a block making device, a cooling device and a change deviceThe device comprises a heat device, a conversion tower and an absorption tower, wherein a discharge port of the total oxygen smelting furnace is connected with a block making device and a cooling device, and a flue gas outlet of the total oxygen smelting furnace is sequentially connected with a heat exchange device, the conversion tower, the absorption tower and a waste gas treatment facility; the temperature in the total oxygen melting furnace is 1400-1600 ℃; the total oxygen smelting furnace is used for a site for total oxygen combustion of a mixture of sulfur-containing industrial miscellaneous salts and silicon dioxide; the block making and cooling device is used for molding and cooling a product generated after the raw materials of the total oxygen smelting furnace are melted to prepare sodium silicate; the conversion tower is used for converting SO in the flue gas2Conversion to SO3(ii) a The absorption tower is used for absorbing SO in the flue gas3By H2And absorbing the O to prepare sulfuric acid.
6. The device for producing sodium silicate and sulfuric acid from high-sulfur salt as claimed in claim 5, further comprising a dust removing device, wherein the dust removing device is connected between the heat exchanging device and the conversion tower.
7. The device for producing sodium silicate and sulfuric acid from high-sulfur salt as claimed in claim 5 or 6, further comprising an exhaust gas treatment device, wherein the exhaust gas treatment device is connected with the smoke outlet of the absorption tower through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010888165.2A CN111994915A (en) | 2020-08-28 | 2020-08-28 | Method and device for producing sodium silicate and sulfuric acid from high-sulfur-content salt |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010888165.2A CN111994915A (en) | 2020-08-28 | 2020-08-28 | Method and device for producing sodium silicate and sulfuric acid from high-sulfur-content salt |
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| CN202010888165.2A Pending CN111994915A (en) | 2020-08-28 | 2020-08-28 | Method and device for producing sodium silicate and sulfuric acid from high-sulfur-content salt |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113371721A (en) * | 2021-07-21 | 2021-09-10 | 青岛美高集团有限公司 | Green and cyclic production method of silica gel |
| CN114014348A (en) * | 2021-12-10 | 2022-02-08 | 郑州中科新兴产业技术研究院 | Treatment method of sulfur-containing waste salt |
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| CN113371721A (en) * | 2021-07-21 | 2021-09-10 | 青岛美高集团有限公司 | Green and cyclic production method of silica gel |
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Application publication date: 20201127 |