CN113582305B - Preparation method and application of modified desulfurized fly ash coagulant - Google Patents
Preparation method and application of modified desulfurized fly ash coagulant Download PDFInfo
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- CN113582305B CN113582305B CN202010362141.3A CN202010362141A CN113582305B CN 113582305 B CN113582305 B CN 113582305B CN 202010362141 A CN202010362141 A CN 202010362141A CN 113582305 B CN113582305 B CN 113582305B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Abstract
The invention discloses a preparation method of a modified desulfurized fly ash coagulant, which comprises the following steps: selecting desulfurized ash; selecting a dry ball mill, wherein the speed of a rotary drum is 18-26 r/min, the ball loading amount is 13-27 t, the ball milling time is 80-160min, and the median diameter of d50 is 2.0-4.5 mu m; mixing and crushing the dry desulfurization ash, coconut shell activated carbon, serpentine and medical stone according to a solid-solid ratio of (9-11); preparing a polyaluminum silicate solution with the concentration of 450-890 mg/L, mixing the dry desulfurization ash mixed powder obtained in the last step with the polyaluminum silicate solution according to the solid-to-liquid ratio of 1.5-5 to form the polyaluminum silicate mixed solution, and uniformly stirring; then adding 15-35 mg of chitosan and 0.4-1.1 mg of polyglyol into each liter of polyaluminium sulfate solution, and reacting the obtained polyaluminium silicate mixed solution for 15-40 min under stirring at the temperature of 40-50 ℃ to form the modified dry desulfurization ash-aluminium silicate coagulant. The modified dry desulfurization ash-aluminum silicate coagulant can effectively remove organic matters and ammonia nitrogen in wastewater, the removal rate of the organic matters reaches over 45 percent, and the removal rate of the ammonia nitrogen reaches over 68 percent.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a modification method of dry-process desulfurized fly ash.
Background
Under the strict requirements of national policies, some large-scale enterprises in China introduce sintering flue gas desulfurization devices into enterprise production, after the desulfurization devices are put into the enterprise production, the emission of harmful substances such as sulfur dioxide is reduced, but new problems follow, and the treated desulfurization byproducts become a large environmental problem.
Sulfur dioxide in the sintering flue gas becomes the most main pollutant in the steel industry, the emission reduction technology of waste gas becomes the key point of research subjects of steel enterprises and environmental protection enterprises, and the comprehensive utilization of the generated sintering flue gas desulfurization ash becomes another problem to be urgently solved. Therefore, the exploration of the comprehensive disposal and utilization mode of the dry flue gas desulfurization ash becomes a key way for building a green and environment-friendly resource-saving society in China.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems that according to the actual dry-method desulfurized fly ash, the dry-method desulfurized fly ash is developed and applied to removing organic matters and ammonia nitrogen in wastewater, reducing environmental pollution and actively coping with increasingly strict environmental protection regulations.
The invention provides a complete modified dry-process desulfurized fly ash and an application technical scheme for the first time, and the modified dry-process desulfurized fly ash is applied to a wastewater treatment process, so the invention belongs to an environment-friendly steel production process system.
The technical scheme adopted by the invention is as follows:
a preparation method of a modified desulfurization ash coagulant comprises the following steps:
1) Selecting dry desulfurization ash of SiO 2 35.9 to 45.6 percent of Al 2 O 3 21.7 to 29.8 percent of CaO, 17.3 to 24.2 percent of CaO and Fe 2 O 3 6.3-13.2% of SO 3 2.2-11.1%, mgO 1.1-2.73%, K 2 O is 0.2 to 1.2 percent;
2) Selecting a dry ball mill, wherein the speed of a rotary drum is 18-26 r/min, the ball loading amount is 13-27 t, the ball milling time is 80-160min, and the median diameter of d50 is 2.0-4.5 mu m;
3) Mixing and crushing the dry desulfurization ash, the coconut shell activated carbon, the serpentine and the medical stone according to the solid-solid ratio of (9-11);
4) Preparing a polyaluminum silicate solution with the concentration of 450-890 mg/L, mixing the dry desulfurization ash mixed powder obtained in the last step with the polyaluminum silicate solution according to the solid-to-liquid ratio of 1.5-5 to form the polyaluminum silicate mixed solution, and uniformly stirring;
5) Then adding 15-35 mg of chitosan and 0.4-1.1 mg of polyglyol into each liter of polyaluminium sulfate mixed solution, and reacting the obtained mixed solution for 15-40 min under stirring at the temperature of 40-50 ℃ to form the modified dry desulfurization ash-aluminum silicate coagulant.
The formula of the dry desulfurization ash, the coconut shell activated carbon, the serpentine and the medical stone comprehensively considers the adsorption capacity of organic matters with different molecular weights in the desulfurization wastewater, and can achieve better adsorption effect.
Preferably, the dry desulfurization ash, the coconut shell activated carbon, the serpentine and the medical stone are mixed according to the solid-solid ratio of 9-10.
According to the preparation method of the modified desulfurized fly ash coagulant of the invention, the particle size of the dry desulfurized fly ash in the step 1) is preferably 10-22 mm.
According to the preparation method of the modified desulfurization ash coagulant, the content of other impurities in the dry desulfurization ash is preferably 0.3-2.9%.
According to the preparation method of the modified desulfurized fly ash coagulant, the ball milling time in the step 2) is preferably 90-140 min; the d50 median diameter in the step 2) is 2.1-4.2 mu m.
According to the preparation method of the modified desulfurization ash coagulant, preferably, in the step 3), the particle size of the coconut shell activated carbon is 2-5 mm, the particle size of the serpentine is 4-7 mm, and the particle size of the medical stone is 3-6 mm.
According to the preparation method of the modified desulfurized fly ash coagulant of the invention, preferably, the dry desulfurized fly ash mixed powder of the step 4) and the polyaluminum silicate solution are mixed according to the solid-to-liquid ratio of 1; step 4), the stirring speed is 60-90 r/min; the stirring time is 7-12 min. This speed is conventional and too fast can affect the mixing effect.
More preferably, the stirring speed is 65 to 85 rpm.
According to the preparation method of the modified desulfurized fly ash coagulant of the invention, preferably, the reaction of step 5) is carried out in a microwave reactor; the microwave power is 200-300W.
According to the preparation method of the modified desulfurized fly ash coagulant of the invention, preferably, the stirring speed of the step 5) is 40-60 r/min.
Further, the stirring speed of the step 5) is 45-55 revolutions per minute; and step 5) reacting for 20-35 min under stirring.
The invention also provides application of the modified desulfurized fly ash coagulant prepared by the preparation method in removing organic matters and ammonia nitrogen in wastewater treatment.
The beneficial effects of the invention are:
the modified dry desulfurization ash-aluminum silicate coagulant can effectively remove organic matters and ammonia nitrogen in wastewater, the removal rate of the organic matters reaches over 45 percent, and the removal rate of the ammonia nitrogen reaches over 68 percent.
Drawings
FIG. 1 is an electron micrograph of the modified dry desulfurized fly ash-aluminum silicate coagulant of example 1.
FIG. 2 is an electron micrograph of a modified dry desulfurized fly ash-aluminum silicate coagulant of example 2.
Detailed Description
Example 1:
the dry desulfurization ash modification scheme of the invention comprises 1) the dry desulfurization ash component (mass percent) is SiO 2 42.1% of Al 2 O 3 22.3% of CaO, 21.2% of CaO, fe 2 O 3 8.3% of SO 3 3.4% of MgO, 1.5% of MgO, K 2 0.7% of O and 0.5% of other impurities. The particle size of the dry desulphurization ash is 15mm. 2) A dry ball mill is selected, the revolving speed of the revolving drum is 22r/min, the ball loading amount is 21t, the ball milling time is 80min, and the median diameter of d50 is 2.7 mu m. 3) Selecting coconut shell activated carbon with the particle size of 4mm, serpentine with the particle size of 5mm and medical stone with the particle size of 5mm, and mixing the dry desulfurization ash, the coconut shell activated carbon, the serpentine and the medical stone according to a solid-solid ratio of 10. 4) Preparation ofMixing the polymeric aluminum silicate solution with the concentration of 650mg/L, the dry desulfurization ash mixed powder and the polymeric aluminum silicate solution according to the solid-to-liquid ratio of 1; 5) Then adding 25mg of chitosan and 0.7mg of polyglycol into each liter of polyaluminium sulfate solution according to volume, and then reacting the polyaluminium silicate mixed solution in a microwave reactor at the microwave power of 320W and the temperature of 45 ℃ at the stirring speed of 50 r/min for 30min. Forming the modified dry desulfurization ash-aluminum silicate coagulant.
Table 1 shows the practical application effect of the modified dry desulfurization ash-aluminum silicate coagulant.
TABLE 1 practical application Effect of modified Dry desulfurization Ash-aluminum silicate coagulant
Example 2:
the dry desulfurization ash modification scheme of the invention comprises 1) the dry desulfurization ash component (mass percent) is SiO 2 40.2% of Al 2 O 3 23.4% of CaO, 19.8% of CaO, fe 2 O 3 9.5% SO 3 2.4% of MgO, 2.4% of K 2 O is 1.2%, and other impurities are 0.8%. 2) A dry ball mill is selected, the speed of a rotary drum is 23r/min, the ball loading amount is 20t, the ball milling time is 110min, and the median diameter of d50 is 2.8 mu m. 3) Selecting coconut shell activated carbon with the particle size of 4mm, serpentine with the particle size of 5mm and medical stone with the particle size of 3mm, and mixing the dry desulfurization ash, the coconut shell activated carbon, the serpentine and the medical stone according to a solid-solid ratio of 10. 4) Preparing a polymeric aluminum silicate solution with the concentration of 810mg/L, mixing the dry-method desulfurized ash mixed powder and the polymeric aluminum silicate solution according to the solid-to-liquid ratio of 1; 3) Then 25mg of chitosan and 0.9mg of polyglyol are added into each liter of polyaluminium sulfate solution according to volume, and then the polyaluminium silicate mixed solution is reacted in a microwave reactor, wherein the microwave power is 300W, and the temperature isThe reaction was carried out at 45 ℃ for 35min with a stirring speed of 55 rpm. Forming the modified dry-process desulfurized fly ash-aluminum silicate coagulant.
Table 2 shows the practical application effect of the modified dry desulfurization ash-aluminum silicate coagulant.
TABLE 2 practical application effect of modified dry desulfurized fly ash-aluminum silicate coagulant
In conclusion, the invention firstly provides a complete dry-method desulfurized fly ash recycling process technical scheme, and the system solves the problem of the dry-method desulfurized fly ash environment, so that the invention belongs to an environment-friendly steel production process system.
Of course, those skilled in the art should recognize that the above-described embodiments are illustrative only, and not limiting, and that changes and modifications can be made within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The preparation method of the modified desulfurization ash coagulant is characterized by comprising the following steps: the method comprises the following steps:
1) Selecting dry desulfurization ash of SiO 2 35.9 to 45.6 percent of Al 2 O 3 21.7 to 29.8 percent of CaO, 17.3 to 24.2 percent of CaO and Fe 2 O 3 6.3 to 13.2 percent of SO 3 2.2-11.1%, mgO 1.1-2.73%, K 2 0.2 to 1.2 percent of O;
2) Selecting a dry ball mill, wherein the speed of a rotary drum is 18-26 r/min, the ball loading amount is 13-27 t, the ball milling time is 80-160min, and the median diameter of d50 is 2.0-4.5 mu m;
3) Mixing and crushing the dry desulfurization ash, coconut shell activated carbon, serpentine and medical stone according to a solid-solid ratio of (9-11);
4) Preparing a polymeric aluminum silicate solution with the concentration of 450-890 mg/L, mixing the dry desulfurized fly ash mixed powder obtained in the last step with the polymeric aluminum silicate solution according to the solid-to-liquid ratio of 1.5-5 to form the polymeric aluminum silicate mixed solution, and uniformly stirring;
5) Then adding 15-35 mg of chitosan and 0.4-1.1 mg of polyglyol into each liter of polyaluminium sulfate mixed solution, and reacting the obtained mixed solution for 15-40 min under stirring at the temperature of 40-50 ℃ to form the modified dry desulfurized ash-aluminum silicate coagulant.
2. The preparation method of the modified desulfurized fly ash coagulant according to claim 1, characterized in that: the particle size of the dry desulphurization ash in the step 1) is 10-22 mm.
3. The preparation method of the modified desulfurized fly ash coagulant according to claim 1, characterized in that: the content of other impurities in the dry desulfurization ash is 0.3-2.9%.
4. The preparation method of the modified desulfurized fly ash coagulant according to claim 1, characterized in that: the ball milling time in the step 2) is 90-140 min; the d50 median diameter of the step 2) is 2.1-4.2 mu m.
5. The preparation method of the modified desulfurized fly ash coagulant according to claim 1, characterized in that: and step 3), the particle size of the coconut shell activated carbon is 2-5 mm, the particle size of the serpentine is 4-7 mm, and the particle size of the medical stone is 3-6 mm.
6. The preparation method of the modified desulfurized fly ash coagulant according to claim 1, characterized in that: step 4), mixing the dry desulfurization ash mixed powder with a polyaluminium silicate solution according to a solid-to-liquid ratio of 1; step 4), the stirring speed is 60-90 r/min; the stirring time is 7-12 min.
7. The preparation method of the modified desulfurization ash coagulant according to claim 1, characterized in that: step 5) the reaction is carried out in a microwave reactor; the microwave power is 200-300W.
8. The preparation method of the modified desulfurized fly ash coagulant according to claim 1, characterized in that: and 5) stirring at 40-60 r/min.
9. The method for preparing a modified desulfurization ash coagulant according to claim 1 or 8, characterized in that: step 5), stirring at a speed of 45-55 rpm; and the step 5) is reacting for 20-35 min under stirring.
10. The modified desulfurized fly ash coagulant prepared by the preparation method of claim 1 is applied to the removal of organic matters and ammonia nitrogen in wastewater treatment.
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| CN108773882A (en) * | 2018-06-26 | 2018-11-09 | 清华大学深圳研究生院 | A kind of Inorganic complex coagulant and its preparation method and application |
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| JP2013000696A (en) * | 2011-06-20 | 2013-01-07 | Fujifilm Corp | Water purification method |
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| CN106007516A (en) * | 2016-05-23 | 2016-10-12 | 武汉钢铁股份有限公司 | Sintering flue gas dry process desulfurized fly ash treatment method |
| JP2017213528A (en) * | 2016-06-01 | 2017-12-07 | 国立大学法人三重大学 | Flocculate-solidifying agent |
| CN107162133A (en) * | 2017-05-26 | 2017-09-15 | 贵州美瑞特环保科技有限公司 | A kind of oil gas field sewage functionalization chitin composite flocculant and preparation method thereof |
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| 脱硫灰改性后作混凝剂处理磷化废水试验研究;裘余丹;《能源环境保护》;20181215;第32卷(第06期);第28-30页 * |
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