CN111763022A - Method for preparing desulfurized gypsum by using dry-process desulfurized fly ash - Google Patents
Method for preparing desulfurized gypsum by using dry-process desulfurized fly ash Download PDFInfo
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- CN111763022A CN111763022A CN201910260016.9A CN201910260016A CN111763022A CN 111763022 A CN111763022 A CN 111763022A CN 201910260016 A CN201910260016 A CN 201910260016A CN 111763022 A CN111763022 A CN 111763022A
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- dry
- desulfurized
- oxidation tower
- fly ash
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- 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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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a method for preparing desulfurized gypsum by using dry desulfurized fly ash, which mainly solves the technical problems of low conversion speed and secondary pollution to the environment caused by sulfur dioxide generated in the conversion process in the existing process for preparing desulfurized gypsum by using dry desulfurized fly ash. The invention provides a method for preparing desulfurized gypsum by using dry desulfurized fly ash, which comprises the following steps of 1) arranging a superconducting magnet in an oxidation tower, and applying magnetic field force to materials in the oxidation tower; 2) inputting the flue gas of the sintering machine into a dry desulphurization ash solution for reaction; 3) carrying out solid-liquid separation on the solution from the oxidation tower by using a vacuum filter; 4) conveying the liquid separated by the vacuum filter to an oxidation tower; 5) distilling the solid separated by the vacuum filter by using a distilling device; 6) and conveying gas generated by the reaction of the sintering machine flue gas and the dry desulfurization ash solution to a slurry tank. CaSO in dry-process desulfurized fly ash of the invention3Conversion of desulfurized gypsum CaSO4The conversion time is less than or equal to 1 hour.
Description
Technical Field
The invention belongs to the technical field of solid waste treatment, and particularly relates to a method for preparing desulfurized gypsum by using dry-process desulfurized fly ash.
Background
In the industrial production process of steel and iron, the generated flue gas contains dust (smoke) and Sulfur Oxides (SO)X) Nitrogen Oxide (NO)X) And CO2The by-product of the semi-dry desulphurization process adopted by the control equipment for the emission of the oxysulfide is dry desulphurization ash, the main components of the dry desulphurization ash are calcium sulfite, calcium carbonate and the like, the calcium sulfite is easy to decompose, so the building material does not use the dry desulphurization ash as a raw material, the state does not have the standard for using the dry desulphurization ash as the building material, and the current wider treatment mode is stacking or landfill, which does not accord with the state for solid wasteAnd (5) processing requirements.
The Chinese patent application with the application publication number of CN106316443A discloses a fly ash aerated concrete block containing sintered dry-process desulfurized fly ash and a preparation method thereof, wherein the fly ash aerated concrete block containing the sintered dry-process desulfurized fly ash comprises the following raw material components in percentage by mass: 6-9% of sintering dry-method desulfurized fly ash, 62-68% of fly ash, 15-20% of quick lime, 8-12% of cement and 1-2% of aluminum powder, wherein the sum of the mass percentages of the raw material components is 100%, and the dry-method desulfurized fly ash is easy to decompose at high temperature, so that the added content is low, and the dry-method desulfurized fly ash cannot be used on a large scale.
Chinese patent application publication No. CN102912445A discloses a process and an apparatus for preparing gypsum whiskers by using semidry desulfurization ash and waste acid, the process comprising: (1) mixing semidry desulfurization ash with water to obtain desulfurization ash slurry, adjusting the pH value of the desulfurization ash slurry to 5-6 by using hydrochloric acid waste acid, and oxidizing to obtain slurry containing calcium sulfate and calcium chloride; (2) and (3) performing cyclone separation on the slurry containing the calcium sulfate and the calcium chloride, mixing the underflow slurry after the cyclone separation to obtain reaction slurry, reacting the reaction slurry with sulfuric acid waste acid, and filtering and dehydrating the obtained product to obtain the alpha-hemihydrate gypsum whisker. However, in the practical application process, firstly, the conversion speed is required to be high, secondly, calcium chloride and calcium nitrite exist in the desulfurized fly ash, if the desulfurized fly ash is not treated, the precipitated calcium nitrite can bring secondary pollution, and thirdly, sulfur dioxide is generated in the conversion process, and if the desulfurized fly ash is not absorbed, secondary pollution can be brought to air.
Disclosure of Invention
The invention aims to provide a method for preparing desulfurized gypsum by using dry desulfurized fly ash, which mainly solves the technical problems of low conversion speed and secondary pollution to the environment caused by sulfur dioxide generated in the conversion process in the existing process for preparing desulfurized gypsum by using dry desulfurized fly ash.
The technical scheme adopted by the invention is that the method for preparing the desulfurized gypsum by using the dry-process desulfurized fly ash comprises the following steps:
1) arranging a superconducting magnet in an oxidation tower, and applying magnetic field force to materials in the oxidation tower; and then inputting the water and the dry desulfurization ash into an oxidation tower, wherein the mass ratio of the dry desulfurization ash to the water is 1.2: 4-1.5: 4; uniformly stirring the dry desulfurization ash and water to prepare a dry desulfurization ash solution, applying a magnetic field force to the dry desulfurization ash solution, and controlling the magnetic field force B to be 8-12T;
2) inputting the flue gas of the sintering machine into a dry-method desulfurized fly ash solution in an oxidation tower, reacting the dry-method desulfurized fly ash solution with the input flue gas of the sintering machine under the stirring condition, and inputting the solution in the oxidation tower into a solid-liquid separation device after the reaction is finished; the temperature of the sintering machine smoke entering the dry method desulfurization ash solution in the oxidation tower is 130-150 ℃, the pressure is 0.4-0.5MPa, and the concentration of the sulfur dioxide in the sintering machine smoke is 100-300ppm/m3The solid-liquid separation device is a vacuum filter;
3) carrying out solid-liquid separation on the solution from the oxidation tower by using a vacuum filter;
4) conveying the liquid separated by the vacuum filter to an oxidation tower, and conveying the solid separated by the vacuum filter to a distillation device;
5) and (3) distilling the solid separated by the vacuum filter by using a distilling device, conveying the waste liquid distilled by the distilling device to an oxidation tower, and distilling the remained solid by using the distilling device to obtain the desulfurized gypsum.
Further, in the step 1) of the invention, the addition ratio of the dry desulfurization ash to water is 1.2: 4-1.5: 4; molecules and atoms in the dry-method desulfurized fly ash solution are disturbed under the action of a magnetic field force, are fully contacted and generate an oxidation reaction, so that the speed of the oxidation reaction is improved; the solid-liquid ratio of the dry desulphurization ash solution can generate unconverted calcium sulfite, so that the conversion rate is low; the solid-liquid ratio is reduced, the conversion rate is improved, but the production efficiency is low, and the large-scale production is not facilitated;
in the step 1) of the invention, CaSO is generated in the dry-method desulfurized fly ash3·1/2H260-70% of O and CaCl20.5-1% of Ca (NO)3)2The mass fraction of (A) is 1-1.5%.
In the step 2), after the flue gas of the sintering machine is introduced, the pH value of the dry-method desulfurized fly ash solution is adjusted to 4.5-5, and the total reaction time is 0.5-1 hour.
In the step 2), the pressure of the flue gas entering the oxidation tower is 0.4-0.5 MPa. High pressure will consume high energy and cause acid gas to overflow, and low pressure will cause insufficient reaction.
The reaction mechanism is as follows: the air in the flue gas of the sintering machine head after dust removal by the dust remover is used for oxidizing the calcium sulfite in the dry-method desulfurized ash, and because the superconducting magnet is added outside the oxidation tower and has a certain magnetic field force, all molecules and atoms inside the oxidation tower are disturbed, so that the reaction is very rapid, and the reaction formula is as follows:
in the reaction, certain kinetic and thermodynamic conditions are given, wherein a stirrer in an oxidation tower is used for stirring during the kinetic, the thermodynamic condition is supplied by smoke gas of a sintering machine head, the temperature of the smoke gas is generally 130-150 ℃, the oxidation reaction temperature condition is met, and the reaction is normally over 60 ℃. The catalyst in the formula is an acidic condition generated by sulfur dioxide in flue gas of a sintering machine head and water in an oxidation tower after dust removal by a dust remover.
After full oxidation, the solution generated by the reaction is subjected to solid-liquid separation, a vacuum filter is adopted as a solid-liquid separation device, and the separated solid is stable CaSO generated by full reaction4And desulfurized gypsum CaSO4The material is a relatively stable raw material in building materials, and is shown in building material industry standard JC/T2074-2011 flue gas desulfurization gypsum.
Separated desulfurized gypsum CaSO4And (4) further distilling, wherein the distilled solid is directly used as a raw material of the building material.
The separated and distilled acidic liquid returns to the oxidation tower to participate in the oxidation reaction under the necessary oxidation conditions, the whole process has no secondary pollution to the environment, but along with the increase of the concentration of the calcium chloride and calcium nitrite dissolved solution in the desulfurized fly ash, the precipitated calcium nitrite can bring secondary pollution if the desulfurized fly ash is not treated.
The treatment method of the invention is that calcium chloride and calcium nitrite in the desulfurized fly ash have larger solubility (both are above 500 g/L), the desulfurized fly ash is dissolved in the solution after treatment, the content of chloride ions in the solution is increased by 0.1% every time of treatment, and for the denitrified desulfurized fly ash, the content of nitrite ions is also increased by about 0.1%.
After several tens of continuous reactions, when the concentration of the solution is high, a precipitation separation apparatus is introduced, calcium chloride and calcium nitrite are precipitated by adding calcium hydroxide and aluminum hydroxide to the apparatus, and calcium chloroaluminate (3 CaOAl) obtained by precipitation is precipitated2O3CaCl210H2O) and the precipitation of the compound salt of calcium nitrite and calcium nitrate, which are independently used as the additive product of the high-strength cement, and the solution is continuously returned for use.
The sulfur dioxide generation reaction formula of the invention is as follows:
as the common slurry contains 5 percent of calcium hydroxide, the sulfur dioxide gas generated by decomposition can be absorbed, and the secondary purification of the separated gas can be realized after the purified gas passes through the slurry spraying device. Practice shows that after the slurry is adopted for absorption, the gas is purified.
Further, in the step 4), the liquid obtained by solid-liquid separation is led into a precipitation separation device, calcium hydroxide and aluminum hydroxide are added, and after complete precipitation, the liquid returns to the oxidation tower. More preferably, the mass fraction of calcium chloride in the liquid obtained by the solid-liquid separation is 0.1-0.2%, the mass fraction of calcium nitrite is 0.2-0.3%, and the mass ratio of the calcium hydroxide, the aluminum hydroxide, the calcium chloride and the calcium nitrite is 2:2:1: 2.
The desulfurized gypsum CaSO prepared by the method of the invention4The performance index of the building material meets the index requirements of building material industry standard JC/T2074-2011 flue gas desulfurization gypsum.
Compared with the prior art, the invention has the following positive effects: 1. CaSO in dry-process desulfurized fly ash of the invention3Conversion of desulfurized gypsum CaSO4The conversion rate is more than 99 percent, the conversion time is less than or equal to 1 hour, and JC/T2074-2011 flue gas desulfurization gypsum is metThe requirements of (1). 2. The method of the invention fully utilizes the temperature of the flue gas of the head of the sintering machine and the medium of sulfur dioxide in the flue gas, thus realizing the purpose of treating wastes with wastes; the problems of calcium chloride and calcium nitrite in the desulfurized fly ash are solved after the problem of calcium sulfite conversion is solved; the problem of secondary pollution caused by the emission of sulfur dioxide generated in the reaction process is solved.
Detailed Description
The present invention will be further illustrated by the following specific examples, which are to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.
A method for preparing desulfurized gypsum by using dry desulfurized fly ash comprises the following steps:
1) introducing water into an oxidation tower with a superconducting magnet and a stirring function, adding dry desulfurization ash to be oxidized, starting a stirrer, and stirring the mixture into a dry desulfurization ash solution; in dry desulfurized fly ash, CaSO3·1/2H260-70% of O and CaCl20.5-1% of Ca (NO)3)2The mass fraction of (A) is 1-1.5%; the adding proportion of the dry desulfurization ash to the water is 1.2: 4; applying a superconducting magnet, wherein the magnetic field force B is 10T, disturbing all molecules and atoms inside the superconducting magnet, fully contacting the molecules and atoms, and reacting for 0.5-1 hour;
2) inputting the flue gas of the sintering machine into a dry-method desulfurized fly ash solution in an oxidation tower, reacting the dry-method desulfurized fly ash solution with the input flue gas of the sintering machine under the stirring condition, and inputting the solution in the oxidation tower into a solid-liquid separation device after the reaction is finished; the temperature of the sintering machine smoke entering the dry method desulfurization ash solution in the oxidation tower is 130-150 ℃, the pressure is 0.4-0.5MPa, and the concentration of the sulfur dioxide in the sintering machine smoke is 100-300ppm/m3The solid-liquid separation device is a vacuum filter;
3) carrying out solid-liquid separation on the solution from the oxidation tower by using a vacuum filter;
4) conveying the liquid separated by the vacuum filter to an oxidation tower, and conveying the solid separated by the vacuum filter to a distillation device;
5) and (3) distilling the solid separated by the vacuum filter by using a distilling device, conveying the waste liquid distilled by the distilling device to an oxidation tower, and distilling the remained solid by using the distilling device to obtain the desulfurized gypsum.
The parameter indexes of the embodiment of the invention are shown in Table 1.
TABLE 1 parameter index of the embodiment of the present invention
| Categories | Test amount, t | Oxidation time, h | Conversion rate | Whether it is qualified or not | With or without pollution |
| Example 1 | 2 | 0.6 | 95.5 | Qualified | Is free of |
| Example 2 | 3 | 0.7 | 96.4 | Qualified | Is free of |
| Example 3 | 4 | 0.8 | 97.8 | Qualified | Is free of |
| Example 4 | 5 | 1.0 | 98.4 | Qualified | Is free of |
| Example 5 | 6 | 0.9 | 97.2 | Qualified | Is free of |
As can be seen from Table 1, the conversion rates of the dry desulfurized fly ash into desulfurized gypsum in examples 1 to 5 are all above 95%, which meets the requirement that the conversion rate is more than or equal to 90%, and the whole process has no secondary pollution to the environment.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and all equivalent substitutions or substitutions made on the above-mentioned embodiments are included in the scope of the present invention.
Claims (5)
1. A method for preparing desulfurized gypsum by using dry desulfurized fly ash is characterized by comprising the following steps:
1) arranging a superconducting magnet in an oxidation tower, and applying magnetic field force to materials in the oxidation tower; and then inputting the water and the dry desulfurization ash into an oxidation tower, wherein the mass ratio of the dry desulfurization ash to the water is 1.2: 4-1.5: 4; uniformly stirring the dry desulfurization ash and water to prepare a dry desulfurization ash solution, applying a magnetic field force to the dry desulfurization ash solution, and controlling the magnetic field force B to be 8-12T;
2) inputting the flue gas of the sintering machine into a dry-method desulfurized fly ash solution in an oxidation tower, reacting the dry-method desulfurized fly ash solution with the input flue gas of the sintering machine under the stirring condition, and inputting the solution in the oxidation tower into a solid-liquid separation device after the reaction is finished; the temperature of the sintering machine smoke entering the dry method desulfurization ash solution in the oxidation tower is 130-150 ℃, the pressure is 0.4-0.5MPa, and the concentration of the sulfur dioxide in the sintering machine smoke is 100-300ppm/m3The solid-liquid separation device is a vacuum filter;
3) carrying out solid-liquid separation on the solution from the oxidation tower by using a vacuum filter;
4) conveying the liquid separated by the vacuum filter to an oxidation tower, and conveying the solid separated by the vacuum filter to a distillation device;
5) distilling the solid separated by the vacuum filter by using a distilling device, conveying the waste liquid distilled by the distilling device to an oxidation tower, and distilling the solid left by the distilling device to obtain desulfurized gypsum;
6) and conveying gas generated by the reaction of the sintering machine flue gas and the dry desulfurization ash solution to a slurry tank, conveying gas discharged from the slurry tank to a slurry spraying device, and discharging the gas treated by the slurry spraying device to the air.
2. The method for preparing desulfurized gypsum from dry desulfurized fly ash according to claim 1, wherein CaSO is contained in dry desulfurized fly ash in step 1)3·1/2H260-70% of O and CaCl20.5-1% of Ca (NO)3)2The mass fraction of (A) is 1-1.5%.
3. The method for preparing desulfurized gypsum from dry desulfurized ash according to claim 1, wherein in step 2), after the flue gas of the sintering machine is introduced, the pH of the solution of dry desulfurized ash is adjusted to 4.5 to 5, and the total reaction time is 0.5 to 1 hour.
4. The method for preparing desulfurized gypsum from dry desulfurized fly ash according to claim 1, wherein in said step 4), the liquid separated by the vacuum filter is introduced into the precipitation separation device, calcium hydroxide and aluminum hydroxide are added, and after the precipitation is completed, the liquid is returned to the oxidation tower.
5. The method for preparing desulfurized gypsum from dry desulfurized ash according to claim 1, wherein in step 4), the mass fraction of calcium chloride and the mass fraction of calcium nitrite in the liquid separated by the vacuum filter are respectively 0.1-0.2% and 0.2-0.3%, and the mass ratio of calcium hydroxide, aluminum hydroxide, calcium chloride and calcium nitrite is 2:2:1: 2.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101890291A (en) * | 2010-08-10 | 2010-11-24 | 四川省达州钢铁集团有限责任公司 | Sintering fume desulphurization method |
| CN102912445A (en) * | 2012-10-22 | 2013-02-06 | 浙江天蓝环保技术股份有限公司 | Process and device for preparing gypsum whisker by semi-dry desulfurized fly ash and waste acid |
| CN103611406A (en) * | 2013-12-10 | 2014-03-05 | 太原理工大学 | Magnetic separation device and method for sulfur dioxide in smoke |
| CN104959018A (en) * | 2015-06-25 | 2015-10-07 | 浙江天蓝环保技术股份有限公司 | Device and method for redesulfuration with desulfurization ash |
| CN105080307A (en) * | 2014-05-12 | 2015-11-25 | 陈汇宏 | Desulfurization and denitrification method for tail gas, used equipment and product application thereof |
| CN106316443A (en) * | 2015-06-30 | 2017-01-11 | 上海梅山钢铁股份有限公司 | Fly ash aerated concrete blocks with sinter-dried desulfurization ash and preparation method thereof |
-
2019
- 2019-04-02 CN CN201910260016.9A patent/CN111763022A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101890291A (en) * | 2010-08-10 | 2010-11-24 | 四川省达州钢铁集团有限责任公司 | Sintering fume desulphurization method |
| CN102912445A (en) * | 2012-10-22 | 2013-02-06 | 浙江天蓝环保技术股份有限公司 | Process and device for preparing gypsum whisker by semi-dry desulfurized fly ash and waste acid |
| CN103611406A (en) * | 2013-12-10 | 2014-03-05 | 太原理工大学 | Magnetic separation device and method for sulfur dioxide in smoke |
| CN105080307A (en) * | 2014-05-12 | 2015-11-25 | 陈汇宏 | Desulfurization and denitrification method for tail gas, used equipment and product application thereof |
| CN104959018A (en) * | 2015-06-25 | 2015-10-07 | 浙江天蓝环保技术股份有限公司 | Device and method for redesulfuration with desulfurization ash |
| CN106316443A (en) * | 2015-06-30 | 2017-01-11 | 上海梅山钢铁股份有限公司 | Fly ash aerated concrete blocks with sinter-dried desulfurization ash and preparation method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 侯长江等: ""臭氧氧化脱硝在烧结烟气中的应用研究"", 《2017京津冀及周边地区钢铁行业废气排放深度治理和利用技术交流会论文集》 * |
| 吴小缓主编: "《工业固废处理与利用技术研究及应用新进展》", 31 July 2017, 中国建材工业出版社 * |
| 张云峰等: ""磁流化床脱除烟气硫分的实验研究与初步理论分析"", 《锅炉技术》 * |
| 金立虎主编: "《混凝土复合保温填充砌块及装饰保温贴面砌块生产与应用技术问答》", 31 May 2015, 中国建材工业出版社 * |
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Application publication date: 20201013 |