CN110950412A - Preparation method of inorganic flocculant based on tuff and aluminum ash - Google Patents
Preparation method of inorganic flocculant based on tuff and aluminum ash Download PDFInfo
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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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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Abstract
The invention discloses a preparation method of an inorganic flocculant based on tuff and aluminum ash, which comprises the following steps: (1) mixing sodium phosphate and tuff, grinding, and sieving to obtain phosphorus activated tuff; (2) adding phosphorus activated tuff into hydrochloric acid solution, and performing ultrasonic treatment to obtain flocculation slurry; (3) and mixing, stirring, aging, drying and grinding the aluminum ash and the flocculation slurry to obtain the inorganic flocculant based on tuff and aluminum ash. Based on the chemical composition characteristics of tuff and aluminum ash, the release of tuff silicon is reinforced in a coupling way through phosphate radical catalysis and ultrasonic reinforcement, silicon-aluminum-phosphorus colloid and aluminosilicate gel are fused together through hydroxyl bridge connection and polycondensation to form a flocculating agent, more than 96% of heavy metal, more than 93% of ammonia nitrogen, more than 93% of COD (chemical oxygen demand) and more than 95% of total phosphorus in the domestic garbage percolate can be removed efficiently, and the recovery efficiency is up to more than 96%; provides a new direction for the high-value utilization of tuff and aluminum ash.
Description
Technical Field
The invention relates to a preparation method of an inorganic flocculant, in particular to a preparation method of an inorganic flocculant based on tuff and aluminum ash.
Background
Tuff belongs to a volcaniclastic rock, is mainly used for producing aggregates, stone sand and stone powder at present, and has low commercial utilization value and limited application range. Tuff contains more than 50% of silicon dioxide and mainly contains low-activity glass silicon. In order to utilize the silicon substance in tuff, a large amount of alkali and a high sintering temperature are generally required to be added to activate the activity of silicon dioxide in tuff so as to promote the generation of the gelled material, however, the temperature resistance requirement of equipment is high in such a way, and the generated gelled material is easy to have the problems of caking and alkali reversion. Silica is hardly dissolved in an acidic environment and the activity of silica is hardly excited in a temperature environment lower than 400 c, so that the acid processing of tuff at a lower temperature is rarely performed.
The aluminum ash belongs to industrial solid waste and contains a large amount of metallic aluminum and aluminum oxide. At present, the aluminum ash is mainly treated in a stockpiling or landfill mode, which not only wastes aluminum resources, but also can cause serious environmental pollution. Therefore, exploring a way for reasonably utilizing the aluminum ash has certain significance for solving the existing problems of aluminum ash disposal and healthy and sustainable development of the aluminum industry.
The landfill leachate is high-concentration organic wastewater, has poor biodegradability and high toxicity, is difficult to degrade, and can cause serious pollution to the surrounding ecological environment if the landfill leachate is directly discharged without treatment. The flocculation method for treating the landfill leachate is simple to operate and can be popularized in a large area. However, the existing flocculating agent has the problems of low pollutant removal rate and poor water body separation effect of the flocculating agent when treating the landfill leachate.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems, the invention provides a preparation method of an inorganic flocculant based on tuff and aluminum ash, which can realize the efficient removal of various pollutants in garbage leachate, has high recovery efficiency of the flocculant, and simultaneously realizes the high-value recycling of the tuff and the aluminum ash so as to achieve the purpose of treating wastes with processes of wastes against one another.
The technical scheme is as follows: the invention relates to a preparation method of an inorganic flocculant based on tuff and aluminum ash, which comprises the following steps:
(1) mixing sodium phosphate and tuff, grinding, and sieving to obtain phosphorus activated tuff;
(2) adding phosphorus activated tuff into hydrochloric acid solution, and performing ultrasonic treatment to obtain flocculation slurry;
(3) and mixing, stirring, aging, drying and grinding the aluminum ash and the flocculation slurry to obtain the inorganic flocculant based on tuff and aluminum ash.
The mass ratio of the sodium phosphate to the tuff is 5-17.5: 100, and preferably 5-15: 100, and the removal rate of different pollutants in the range is high, and the cost is low.
The concentration of the hydrochloric acid solution is 5-17.5 mol/L, and the preferable concentration is 5-15 mol/L, so that the removal rate of different pollutants in the range is high, and the cost is low.
The mass ratio of the aluminum ash to the flocculated slurry is 2-8: 100, and the preferable ratio is 2-6: 100, so that the removal rate of different pollutants is high in the range, and the cost is low.
After mixing the sodium phosphate and the tuff, grinding the mixture for 30-60 min at the rotating speed of 2000-10000 rpm, and then sieving the mixture by a sieve of 2000-8000 meshes.
The solid-to-liquid ratio of the phosphorus activated tuff to the hydrochloric acid solution is 1: 1-2; the temperature of ultrasonic treatment is 60-100 ℃, the ultrasonic power is 400-1200W, and the ultrasonic time is 6-12 h.
And after mixing the aluminum ash and the flocculation slurry, stirring at the rotating speed of 120-240 rpm for 3-6 h, and then aging for 3-6 h.
Mixing sodium phosphate and tuff, grinding at high speed, and rapidly crushing tuff particles under the action of high-frequency shearing and phosphate radical catalysis, wherein part of glassy silicon in the tuff is converted into soluble silicate. Under the environment of higher temperature and ultrasonic action, more silicon dioxide in the tuff powder is converted into silicate by ultrasonic cavitation bubble implosion and phosphate radical catalysis. And further hydrolyzing, polymerizing and gelling the silicate and the phosphate in a strong acid environment to generate the silicon-phosphorus heteropoly acid. The aluminosilicate in soluble state in tuff is gelatinized and mixed with the silicon-phosphorus heteropoly acid and kneaded together. After the aluminum ash and the flocculation slurry are mixed, a large amount of aluminum ions are firstly dissolved and released in the aluminum ash, and then the aluminum ions and silicon-phosphorus heteropolyacid in the flocculation slurry are bridged through oxygen atoms to generate silicon-aluminum-phosphorus colloid. The silicon-aluminum-phosphorus colloid and the aluminosilicate gel are further fused together through hydroxyl bridge connection and condensation polymerization to generate a final flocculating constituent. In a water body environment, the flocculating constituent removes various pollutants from the water body through the ways of net capture rolling sweeping, electrostatic adsorption, surface hydroxyl complexation, ion exchange and the like.
Has the advantages that: compared with the prior art, the invention is based on the chemical component characteristics of tuff and aluminum ash, couples and strengthens the release of tuff silicon through the phosphate radical catalysis and the ultrasonic strengthening action, and fuses the silicon-aluminum-phosphorus colloid and the aluminosilicate gel together through the hydroxyl bridge connection and the polycondensation action to form the flocculant. The inorganic flocculant prepared from tuff and aluminum ash can efficiently remove more than 96% of heavy metals, more than 93% of ammonia nitrogen, more than 93% of COD and more than 95% of total phosphorus in the domestic garbage leachate; the recovery efficiency of the inorganic flocculant reaches more than 96 percent, the recovered flocculant can be reused, and the use cost is low; provides a new direction for the high-value utilization of tuff and aluminum ash and realizes the treatment of wastes with processes of wastes against one another.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
It should be noted that the leachate of the domestic waste used in the present invention is obtained from the sanitary landfill of the domestic waste in the Qingcheng mountain of the Haizhou region of the Hongyun harbor city. The COD mass concentration of the urban domestic garbage percolate of the batch is 1234.17mg/L, the total phosphorus concentration is 136.38mg/L, the ammonia nitrogen concentration is 768.62mg/L, the mercury concentration is 0.81mg/L, and the arsenic concentration is 6.25 mg/L.
Example 1
The quality ratio of the sodium phosphate to the tuff is compared with that of the prepared inorganic flocculant to remove the influence of COD, total phosphorus, ammonia nitrogen, mercury and arsenic in the landfill leachate
Preparing an inorganic flocculant based on tuff and aluminum ash: as shown in figure 1, respectively weighing sodium phosphate and tuff according to the mass ratio of 2.5:100, 3.5:100, 4.5:100, 5:100, 10:100, 15:100, 15.5:100, 16.5:100 and 17.5:100, mixing, grinding for 30min at the high rotation speed of 2000rpm, and sieving with a 2000-mesh sieve to obtain phosphorus activated tuff ultrafine powder; mixing concentrated hydrochloric acid and water to prepare a 5mol/L hydrochloric acid solution, adding phosphorus-activated tuff ultrafine powder into the hydrochloric acid solution according to a solid-liquid ratio of 1:1(mg: mL), and performing ultrasonic action for 6 hours at the temperature of 60 ℃ and under the output power of 400W to obtain flocculated slurry; respectively weighing the aluminum ash and the flocculation slurry according to the mass ratio of the aluminum ash to the flocculation slurry of 2:100, mixing, continuously stirring at the rotating speed of 120rpm for 3h, aging for 3h, drying in vacuum, and grinding to obtain the tuff and aluminum ash based inorganic flocculant.
Adsorption test: 5g of flocculant is put into 1L of domestic garbage percolate, stirred for 30min at the rotating speed of 60rmp, centrifuged at the rotating speed of 5000rpm, and subjected to solid-liquid separation. And detecting the concentrations of different pollutants in the separated liquid and calculating the removal rate, wherein the specific detection and calculation are as follows.
COD concentration detection and COD removal rate calculation: the Chemical Oxygen Demand (COD) concentration of the leachate is measured according to the national standard bichromate method for measuring the chemical oxygen demand of water (GB 11914-. The COD removal rate was calculated according to the formula (1), wherein RCODAs the removal rate of COD, cCODOAnd cCODtThe COD concentration (mg/L) of the domestic garbage percolate before and after treatment is respectively.
And (3) detecting the concentration of total phosphorus and calculating the removal rate of the total phosphorus: the total phosphorus concentration of the leachate is measured according to the standard continuous flow-ammonium molybdate spectrophotometry for measuring phosphate and total phosphorus in water (HJ 670-2013). The total phosphorus removal was calculated according to formula (2), where RTPAs a total phosphorus removal rate, cTP0And cTPtThe total phosphorus concentration (mg/L) of the domestic garbage leachate before and after treatment is respectively.
Detecting the ammonia nitrogen concentration and calculating the ammonia nitrogen removal rate: the concentration of the leachate ammonia nitrogen is measured according to salicylic acid spectrophotometry for measuring water ammonia nitrogen (HJ 536-2009). The ammonia nitrogen removal rate is calculated according to formula (3), wherein RNFor ammonia nitrogen removal, cN0Is the initial concentration (mg/L) of ammonia nitrogen in the percolate before treatment, cNtThe residual concentration (mg/L) of ammonia nitrogen in the treated percolate is obtained.
And (3) mercury and arsenic concentration detection and removal rate calculation: the concentration of mercury and arsenic in the leachate is measured according to the atomic fluorescence method for measuring mercury, arsenic, selenium, bismuth and antimony in water (HJ 695-. The removal rate of mercury and arsenic is calculated according to the formulas (4) and (5), wherein RHg、RAsRespectively mercury and arsenic removal rate, cHg0、cAs0Initial concentration (mg/L) of mercury and arsenic in the leachate before treatment, cHgt、cAstThe concentration (mg/L) of mercury and arsenic in the treated leachate is shown.
Table 1 sodium phosphate and tuff quality ratio effects of the prepared inorganic flocculant on removal of COD, total phosphorus, ammonia nitrogen, mercury and arsenic in landfill leachate
As can be seen from table 1, when the mass ratio of sodium phosphate to tuff is less than 5:100 (as shown in table 1, when the mass ratio of sodium phosphate to tuff is 4.5:100, 3.5:100, 2.5:100 and lower ratios not listed in table 1), the amount of sodium phosphate is less, the catalytic effect of phosphate radical is insufficient, the amount of silico-phosphorus heteropolyacid is less, the net-roll-sweep and surface hydroxyl complexation of the prepared flocculant are weaker, so that the COD removal rate is less than 75%, the total phosphorus removal rate is less than 78%, the ammonia nitrogen removal rate is less than 73%, the mercury removal rate is less than 76%, the arsenic removal rate is less than 74%, and the COD, total phosphorus, ammonia nitrogen, mercury, and arsenic removal rates are all significantly reduced as the mass ratio of sodium phosphate to tuff is reduced. When the mass ratio of the sodium phosphate to the tuff is 5-15: 100 (as shown in table 1, the mass ratio of the sodium phosphate to the tuff is 5:100, 10:100 and 15:100), a proper amount of sodium phosphate is obtained, the phosphate radical catalysis effect is sufficient, the generation amount of the silicon-phosphorus heteropolyacid is large, and the prepared flocculant has strong net-capture roll sweeping and surface hydroxyl complexation effects, so that the COD removal rate is higher than 81%, the total phosphorus removal rate is higher than 84%, the ammonia nitrogen removal rate is higher than 83%, the mercury removal rate is higher than 86% and the arsenic removal rate is higher than 86%. When the mass ratio of the sodium phosphate to the tuff is more than 15:100 (as shown in table 1, the mass ratio of the sodium phosphate to the tuff is 15.5:100, 16.5:100, 17.5:100 and higher ratios not listed in table 1), the removal rates of COD, total phosphorus, ammonia nitrogen, mercury and arsenic are not obviously changed along with the further increase of the mass ratio of the sodium phosphate to the tuff. Therefore, in a comprehensive aspect, the benefit and the cost are combined, and when the mass ratio of the sodium phosphate to the tuff is 5-15: 100, the performance of removing COD, total phosphorus, ammonia nitrogen, mercury and arsenic in the landfill leachate by using the prepared inorganic flocculant is improved most beneficially.
Example 2
Influence of the concentration of the hydrochloric acid solution on removal of COD, total phosphorus, ammonia nitrogen, mercury and arsenic in the landfill leachate by the prepared inorganic flocculant
Preparing an inorganic flocculant based on tuff and aluminum ash: weighing sodium phosphate and tuff according to the mass ratio of 15:100, mixing, grinding at 6000rpm for 45min, and sieving with 5000 mesh sieve to obtain phosphorus-activated tuff superfine powder; mixing concentrated hydrochloric acid and water to respectively prepare hydrochloric acid solutions of 2.5mol/L, 3.5mol/L, 4.5mol/L, 5mol/L, 10mol/L, 15mol/L, 15.5mol/L, 16.5mol/L and 17.5 mol/L; adding phosphorus activated tuff ultrafine powder into hydrochloric acid solution according to a solid-liquid ratio of 1:1.5(mg: mL), and performing ultrasonic action for 9h at the temperature of 80 ℃ and under the output power of 800W to obtain flocculated slurry; respectively weighing the aluminum ash and the flocculation slurry according to the mass ratio of the aluminum ash to the flocculation slurry of 4:100, mixing, continuously stirring at the rotating speed of 180rpm for 4.5h, aging for 4.5h, drying in vacuum, and grinding to obtain the inorganic flocculant based on tuff and aluminum ash.
The adsorption test, the detection of different pollutant concentrations and the calculation of removal rate were the same as in example 1, and the results are shown in Table 2.
TABLE 2 influence of hydrochloric acid solution concentration on removal of COD, total phosphorus, ammonia nitrogen, mercury and arsenic in landfill leachate by prepared inorganic flocculant
As can be seen from table 2, when the concentration of the hydrochloric acid solution is less than 5mol/L (as shown in table 2, when the concentration of the hydrochloric acid solution is 4.5, 3.5, 2.5mol/L and lower ratios not listed in table 2), the concentration of the hydrochloric acid solution is lower, the silicate and the phosphate have poor hydrolysis, polymerization and gelling effects, the generated silico-phosphorus heteropoly acid is less, meanwhile, the gelation effect of the soluble aluminosilicate in tuff is poor, the aluminosilicate is not sufficiently mixed with the silico-phosphorus heteropoly acid, the prepared flocculant is weak in network trapping, electrostatic adsorption, surface hydroxyl complexation and ion exchange, and the COD removal rate is less than 74%, the total phosphorus removal rate is less than 72%, the ammonia nitrogen removal rate is less than 77%, the mercury removal rate is less than 77%, the arsenic removal rate is less than 79%, and the COD removal rate, the total phosphorus removal rate, the ammonia nitrogen removal rate, the mercury removal rate and the arsenic removal rate are all significantly reduced as the concentration of the hydrochloric acid is reduced. When the concentration of the hydrochloric acid solution is equal to 5-15 mol/L (as shown in Table 2, when the concentration of the hydrochloric acid solution is 5, 10, 15 mol/L), the concentration of the hydrochloric acid is proper, silicate and phosphate are further hydrolyzed, polymerized, gelled under a strong acid environment to generate silicon-phosphorus heteropoly acid, aluminosilicate in a soluble state in tuff is gelled and mixed with the silicon-phosphorus heteropoly acid and kneaded together, and in a water body environment, a flocculating body removes various pollutants from a water body through ways of net catching, rolling and sweeping, electrostatic adsorption, surface hydroxyl complexing, ion exchange and the like, and finally, the COD removal rate is higher than 86%, the total phosphorus removal rate is higher than 89%, the ammonia nitrogen removal rate is higher than 87%, the mercury removal rate is higher than 91%, and the arsenic removal rate is higher than 91%. When the hydrochloric acid concentration is more than 15mol/L (as shown in the table 2, when the hydrochloric acid concentration is 15.5, 16.5 and 17.5mol/L and higher ratios not listed in the table 2), the removal rates of COD, total phosphorus, ammonia nitrogen, mercury and arsenic are not obviously changed along with the further increase of the hydrochloric acid concentration. Therefore, in a comprehensive aspect, the benefit and the cost are combined, and when the concentration of the hydrochloric acid is equal to 5-15 mol/L, the performance of removing COD, total phosphorus, ammonia nitrogen, mercury and arsenic in the landfill leachate by using the prepared inorganic flocculant is improved.
Example 3
The quality ratio of the aluminum ash to the flocculated slurry is compared with the quality ratio of the prepared inorganic flocculating agent to remove the influence of COD, total phosphorus, ammonia nitrogen, mercury and arsenic in the landfill leachate
Preparing an inorganic flocculant based on tuff and aluminum ash: weighing sodium phosphate and tuff according to the mass ratio of 15:100, mixing, grinding at 10000rpm for 60min, and sieving with 8000 mesh sieve to obtain phosphorus activated tuff superfine powder; mixing concentrated hydrochloric acid and water to prepare a 15mol/L hydrochloric acid solution, adding phosphorus-activated tuff ultrafine powder into the hydrochloric acid solution according to a solid-liquid ratio of 1:2(mg: mL), and performing ultrasonic action for 12 hours at the temperature of 100 ℃ and under the output power of 1200W to obtain flocculated slurry; respectively weighing the aluminum ash and the flocculation slurry according to the mass ratio of the aluminum ash to the flocculation slurry of 1:100, 1.5:100, 1.75:100, 2:100, 4:100, 6:100, 6.5:100, 7:100 and 8:100, mixing, continuously stirring at the rotating speed of 240rpm for 6h, aging for 6h, drying in vacuum, and grinding to obtain the tuff and aluminum ash based inorganic flocculant.
The adsorption test, the detection of different pollutant concentrations and the calculation of removal rate were the same as in example 1, and the results are shown in Table 3.
Table 3 quality ratio of aluminum ash and flocculated slurry to the effect of the prepared inorganic flocculant on removal of COD, total phosphorus, ammonia nitrogen, mercury and arsenic in landfill leachate
As can be seen from table 3, when the mass ratio of the aluminum ash to the flocculated slurry is less than 2:100 (as shown in table 3, when the mass ratio of the aluminum ash to the flocculated slurry is 1.75:100, 1.5:100, 1:100 and lower ratios not listed in table 3), the amount of dissolved aluminum ions is less, the bridging between aluminum ions and the silico-phosphorus heteropoly acid in the flocculated slurry is insufficient, and the amount of generated silico-aluminum-phosphorus colloid is less, resulting in COD removal rate lower than 83%, total phosphorus removal rate lower than 81%, ammonia nitrogen removal rate lower than 79%, mercury removal rate lower than 86%, arsenic removal rate lower than 84%, and COD, total phosphorus, ammonia nitrogen, mercury, and arsenic removal rate significantly decrease as the mass ratio of the aluminum ash to the flocculated slurry decreases. When the mass ratio of the aluminum ash to the flocculation slurry is 2-6: 100 (as shown in table 3, when the mass ratio of the aluminum ash to the flocculation slurry is 2:100, 4:100, and 6: 100), firstly dissolving the aluminum ash to release a large amount of aluminum ions, then bridging the aluminum ions and silicon-phosphorus heteropolyacid in the flocculation slurry through oxygen atoms to generate silicon-aluminum-phosphorus colloid, further fusing the silicon-aluminum-phosphorus colloid and the aluminosilicate gel together through hydroxyl bridge connection and polycondensation to generate a final flocculent, removing various pollutants from a water body by the flocculent through network rolling, electrostatic adsorption, surface hydroxyl complexation, ion exchange and the like in a water body environment, and finally, removing COD, total phosphorus, ammonia and nitrogen by the methods of higher than 90%, mercury by the methods of higher than 94%, and arsenic by the methods of higher than 93%. When the mass ratio of the aluminum ash to the flocculated slurry is greater than 6:100 (as shown in table 3, the mass ratio of the aluminum ash to the flocculated slurry is 6.5:100, 7:100, 8:100 and higher ratios not listed in table 3), the removal rate of COD, total phosphorus, ammonia nitrogen, mercury and arsenic is not changed obviously along with the further increase of the mass ratio of the aluminum ash to the flocculated slurry. Therefore, in a comprehensive aspect, the benefit and the cost are combined, and when the mass ratio of the aluminum ash to the flocculated slurry is 2-6: 100, the performance of removing COD, total phosphorus, ammonia nitrogen, mercury and arsenic in the landfill leachate by using the prepared inorganic flocculant is improved most favorably.
Example 5
Preparing an inorganic flocculant based on tuff and aluminum ash: weighing sodium phosphate and tuff according to the mass ratio of 15:100, mixing, grinding at 10000rpm for 60min, and sieving with 8000 mesh sieve to obtain phosphorus activated tuff superfine powder; mixing concentrated hydrochloric acid and water to prepare a 15mol/L hydrochloric acid solution, adding phosphorus-activated tuff ultrafine powder into the hydrochloric acid solution according to a solid-liquid ratio of 1:2(mg: mL), and performing ultrasonic action for 12 hours at the temperature of 100 ℃ and under the output power of 1200W to obtain flocculated slurry; respectively weighing the aluminum ash and the flocculation slurry according to the mass ratio of the aluminum ash to the flocculation slurry of 6:100, mixing, continuously stirring at the rotating speed of 240rpm for 6h, aging for 6h, drying in vacuum, and grinding to obtain the tuff and aluminum ash based inorganic flocculant.
Two commonly used flocculants were purchased from shanghai night chemical company, ltd: polyacrylamide (PAM) as an organic polymeric flocculant and polyaluminium chloride (PAC) as an inorganic polymeric flocculant.
The flocculant prepared in example 5, PAM and PAC were used for the treatment of domestic waste leachate, adsorption test, detection of different contaminant concentrations and calculation of removal rate were the same as in example 1, and the results are shown in table 4.
The recovery efficiency of the flocculant was also calculated: and drying the solid separated from the solid and the liquid in the adsorption test to obtain the recovered flocculant for adsorbing the pollutants. The flocculant recovery efficiency is calculated according to equation (6), where RxFor flocculant recovery efficiency, m0Is the original weight (mg) of the flocculant, mtWeight (mg) of flocculant recovered to adsorb contaminants, cCOD0、cTP0、cN0、cAs0、cHg0Respectively the initial concentrations (mg/L) and c of pollutants COD, total phosphorus, ammonia nitrogen, arsenic and mercury in the landfill leachateCODt、cTPt、cNt、cAst、cHgtThe concentration (mg/L) of pollutants COD, total phosphorus, ammonia nitrogen, arsenic and mercury in the landfill leachate after treatment is respectively, and V is the volume (V) of the landfill leachate.
Table 4 comparison of the pollutant removal rate and separation and recovery efficiency of the flocculant prepared according to the present invention and the conventional flocculant
As can be seen from the test results in Table 4, the pollutant removal efficiency and separation and recovery efficiency of the flocculant prepared by the invention are obviously higher than those of the conventional and commonly used flocculants PAM and PAC.
Claims (10)
1. A preparation method of an inorganic flocculant based on tuff and aluminum ash is characterized by comprising the following steps:
(1) mixing sodium phosphate and tuff, grinding, and sieving to obtain phosphorus activated tuff;
(2) adding phosphorus activated tuff into hydrochloric acid solution, and performing ultrasonic treatment to obtain flocculation slurry;
(3) and mixing, stirring, aging, drying and grinding the aluminum ash and the flocculation slurry to obtain the inorganic flocculant based on tuff and aluminum ash.
2. The preparation method of the tuff and aluminum ash based inorganic flocculant according to claim 1, wherein the mass ratio of the sodium phosphate to the tuff is 5-17.5: 100.
3. The preparation method of the tuff and aluminum ash based inorganic flocculant according to claim 2, wherein the mass ratio of the sodium phosphate to the tuff is 5-15: 100.
4. The method for preparing the tuff and aluminum ash based inorganic flocculant according to claim 1, wherein the concentration of the hydrochloric acid solution is 5-17.5 mol/L.
5. The method for preparing the tuff and aluminum ash-based inorganic flocculant according to claim 4, wherein the concentration of the hydrochloric acid solution is 5-15 mol/L.
6. The preparation method of the tuff and aluminum ash-based inorganic flocculant according to claim 1, wherein the mass ratio of the aluminum ash to the flocculated slurry is 2-8: 100.
7. The preparation method of the tuff and aluminum ash-based inorganic flocculant according to claim 6, wherein the mass ratio of the aluminum ash to the flocculated slurry is 2-6: 100.
8. The method for preparing the tuff and aluminum ash based inorganic flocculant according to claim 1, wherein the sodium phosphate and the tuff are mixed, ground at 2000-10000 rpm for 30-60 min, and sieved with 2000-8000 mesh sieve.
9. The preparation method of the tuff and aluminum ash-based inorganic flocculant according to claim 1, wherein the solid-to-liquid ratio of the phosphorus-activated tuff to the hydrochloric acid solution is 1: 1-2; the temperature of ultrasonic treatment is 60-100 ℃, the ultrasonic power is 400-1200W, and the ultrasonic time is 6-12 h.
10. The method for preparing the tuff and aluminum ash-based inorganic flocculant according to claim 1, wherein the aluminum ash and the flocculation slurry are mixed, stirred at a rotating speed of 120-240 rpm for 3-6 hours, and then aged for 3-6 hours.
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| CN111437801A (en) * | 2020-05-26 | 2020-07-24 | 常熟理工学院 | Method for preparing silicon-based adsorbent by using waste silicone oil |
| CN111762791A (en) * | 2020-05-21 | 2020-10-13 | 北京市城市管理研究院 | Method for preparing flocculating agent by utilizing furnace slag and application thereof |
| CN113184966A (en) * | 2021-04-28 | 2021-07-30 | 常熟理工学院 | Method for preparing carbon quantum loaded polysilicate aluminum ferric flocculant by using bauxite and tuff |
| CN114229978A (en) * | 2022-01-05 | 2022-03-25 | 常熟理工学院 | Method for preparing phosphorus-magnesium-doped polyaluminum chloride flocculating agent by using secondary aluminum ash |
| CN116921384A (en) * | 2023-09-18 | 2023-10-24 | 常熟理工学院 | Method for preparing polymeric flocculant and high-chlorine salt-tolerant cement by using secondary aluminum ash |
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| CN111762791A (en) * | 2020-05-21 | 2020-10-13 | 北京市城市管理研究院 | Method for preparing flocculating agent by utilizing furnace slag and application thereof |
| CN111437801A (en) * | 2020-05-26 | 2020-07-24 | 常熟理工学院 | Method for preparing silicon-based adsorbent by using waste silicone oil |
| CN113184966A (en) * | 2021-04-28 | 2021-07-30 | 常熟理工学院 | Method for preparing carbon quantum loaded polysilicate aluminum ferric flocculant by using bauxite and tuff |
| CN113184966B (en) * | 2021-04-28 | 2022-05-24 | 常熟理工学院 | Method for preparing carbon quantum loaded polysilicate aluminum ferric flocculant by using bauxite and tuff |
| CN114229978A (en) * | 2022-01-05 | 2022-03-25 | 常熟理工学院 | Method for preparing phosphorus-magnesium-doped polyaluminum chloride flocculating agent by using secondary aluminum ash |
| CN114229978B (en) * | 2022-01-05 | 2023-08-22 | 常熟理工学院 | Method for preparing phosphorus-magnesium doped polyaluminum chloride flocculant by using secondary aluminum ash |
| CN116921384A (en) * | 2023-09-18 | 2023-10-24 | 常熟理工学院 | Method for preparing polymeric flocculant and high-chlorine salt-tolerant cement by using secondary aluminum ash |
| CN116921384B (en) * | 2023-09-18 | 2023-12-19 | 常熟理工学院 | Method for preparing polymeric flocculant and high-chlorine salt-tolerant cement by using secondary aluminum ash |
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