CN112607839A - Aluminum ferric silicate flocculant and preparation method thereof - Google Patents
Aluminum ferric silicate flocculant and preparation method thereof Download PDFInfo
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- CN112607839A CN112607839A CN202011495219.5A CN202011495219A CN112607839A CN 112607839 A CN112607839 A CN 112607839A CN 202011495219 A CN202011495219 A CN 202011495219A CN 112607839 A CN112607839 A CN 112607839A
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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Abstract
The invention provides an aluminum ferric silicate flocculant and a preparation method thereof, wherein the aluminum ferric silicate flocculant is mainly prepared from a raw material solution and poly dimethyl diallyl ammonium chloride emulsion serving as raw materials; the raw material solution comprises a sodium silicate solution and a waste acid mixed solution; wherein the mass percentage concentration of the sodium silicate solution is more than 12 wt%; the molar ratio of aluminum to iron of the waste acid mixed solution is (1-1.2): 1. The ferric aluminum silicate flocculant has better sewage treatment effect, the removal rate of the oil content after treatment reaches more than 90%, the removal rate of suspended matters reaches more than 95%, and the requirement on sewage treatment can be met.
Description
Technical Field
The invention relates to the technical field of flocculating agents, and particularly relates to an aluminum ferric silicate flocculating agent and a preparation method thereof.
Background
In recent years, with the rapid development of the industry in China, the problem of industrial pollution is more and more serious. Industrial pollution has become a widespread concern. One of the problems of industrial pollution is the discharge of a large amount of acidic waste liquid, wherein the industrial chemical foil production plant is particularly prominent, low-voltage electrode foil production enterprises generate a large amount of waste hydrochloric acid everyday, and the treatment of the waste liquid mainly comprises lime neutralization, evaporative crystallization and diffusion dialysis. But all have the problems of very high operation cost or secondary pollution. Therefore, a recycling method is needed to treat the waste acid in the industry, and the purposes of recycling the waste acid and protecting the environment are thoroughly realized.
The flocculant can promote the precipitation of colloidal particles and other suspended particles, and is a common medicament in sewage treatment. Because organic polymeric flocculants may be toxic and expensive, water treatment applications are rare. At present, aluminum salt and iron salt flocculating agents are mainly studied on inorganic polymeric flocculating agents. The aluminum salt flocculating agent has large floc and good color removal performance, but is not easy to precipitate; ferric salt flocculant has compact floc and high settling rate, but iron ions have adverse effect on industrial water and strong corrosivity on equipment, and the application of the ferric salt flocculant in the aspects of water treatment is limited.
Patent CN110526364A discloses a method for preparing a polysilicate aluminum ferric flocculant from waste incineration fly ash, which has a complex production process and large component fluctuation of raw materials, and thus the components of the finished product are not easy to control, the quality stability is poor, and the impurity treatment of sewage is further affected.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide an aluminum ferric silicate flocculating agent, which integrates the adsorption and bridging performances of polysilicic acid and the advantages of aluminum salt and ferric salt, has good effects on removing turbidity, decoloring, removing heavy metal ions and the like, and realizes the resource utilization of waste hydrochloric acid in production.
The second purpose of the invention is to provide the preparation method of the ferric aluminum silicate flocculant, which has simple operation, can combine strong aluminum salt adsorption capacity, large formed alum floc, fast dense precipitation, fast iron salt hydrolysis speed and dense alum floc, effectively play the synergistic effect of aluminum salt and iron salt, and the prepared flocculant has good sewage treatment effect.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides an aluminum ferric silicate flocculant, which is mainly prepared from a raw material solution and poly dimethyl diallyl ammonium chloride emulsion serving as raw materials; the raw material solution comprises a sodium silicate solution and a waste acid mixed solution;
wherein the mass percentage concentration of the sodium silicate solution is more than 12 wt%; the molar ratio of aluminum to iron of the waste acid mixed solution is (1-1.2): 1.
In the prior art, most of patent medicaments are single in component, are basically on the level of treating single suspended matters or single chromaticity, and are mostly applied to aluminum salt and iron salt flocculants at present, wherein the aluminum salt flocculants are large in floc and good in color removal performance, but are not easy to precipitate; ferric salt flocculant has compact floc and high settling rate, but iron ions have adverse effect on industrial water and strong corrosivity on equipment, so that the application of the flocculant in various aspects of water treatment is limited.
According to the invention, by adding the sodium silicate solution and the waste acid mixed solution, the advantages of aluminum salt, iron salt and polysilicic acid can be integrated, and macromolecular inorganic salt polymeric aluminum ferric silicate containing aluminum element, iron element and silicon element is generated, so that excellent color removal performance is ensured, the sedimentation rate can be improved, and meanwhile, corrosion to the inside of equipment can be avoided; the composite poly dimethyl diallyl ammonium chloride polymer organic flocculant can ensure that the adsorption and bridging capacity of the agent is stronger and the treatment efficiency is higher when the agent is used for treating sewage; by mixing aluminum and iron according to a certain molar ratio, the aluminum salt and the iron salt can be cooperatively matched, the cooperative action of the aluminum salt and the iron salt is effectively exerted, and the flocculation effect of the flocculant is improved.
Preferably, the molar ratio of (aluminum + iron)/silicon of the raw material solution is (1-1.2): 1. By limiting the molar ratio of the flocculant to the flocculant, the synergistic effect is improved, the good color removal performance of the flocculant is further ensured, and the precipitation rate is improved.
Preferably, the waste acid mixed solution comprises industrial aluminum hydroxide, a waste acid solution and industrial ferric trichloride. By using the waste acid solution, hydrochloric acid and aluminum trichloride in the waste acid solution are utilized, so that the resource utilization rate is improved; on the other hand, the waste acid liquid can be effectively treated, and the damage of the waste acid liquid to the environment is prevented.
Preferably, the content of hydrochloric acid in the waste acid solution is 16-18 wt%, and the content of aluminum trichloride is 1.5-3 wt%; the content of aluminum trioxide in the industrial-grade aluminum hydroxide is more than or equal to 64 wt%; the ferric trichloride in the industrial-grade ferric trichloride is more than or equal to 96 wt%. The industrial sodium silicate can increase the molecular weight of the medicament, so that the formed alum floc has higher speed and more compactness, and the flocculation rate is improved; the industrial-grade aluminum hydroxide can provide sufficient aluminum salt for the flocculant, so that the adsorption capacity of the flocculant is improved, large alum floc is formed, and the precipitation rate is accelerated; the industrial-grade ferric trichloride can provide sufficient ferric salt for a system, so that the hydrolysis speed of the flocculating agent is increased, and the generated alum floc is denser.
The invention also provides a preparation method of the ferric aluminum silicate flocculant, which comprises the following steps:
mixing the sodium silicate solution and the waste acid mixed solution, stirring uniformly, curing, adding the poly dimethyl diallyl ammonium chloride emulsion, and stirring and mixing.
Preferably, the preparation method of the waste acid mixed solution comprises the following steps: dissolving industrial aluminum hydroxide in the waste acid liquor, adding industrial ferric trichloride, and stirring uniformly.
Preferably, the stirring speed after the industrial-grade aluminum hydroxide is added is 80-120r/min, the temperature is 125-135 ℃, the pressure is 0.2-0.35 MPa, and the stirring time is 4 h; the stirring temperature after the addition of the industrial-grade ferric trichloride was 125-135 ℃.
Preferably, the preparation method of the sodium silicate solution is as follows: dissolving industrial sodium silicate in water to prepare a sodium silicate solution.
Preferably, the dissolving temperature is 60-80 ℃, and the dissolving and stirring speed is 80-120 r/min.
Preferably, the soluble silicate content of the industrial sodium silicate is 98.5 wt%.
Preferably, the mixing temperature of the sodium silicate solution and the waste acid mixed solution is 60-90 ℃, the stirring speed is 80-120r/min, and the stirring time is 4-6 h.
Preferably, the curing temperature is 50-60 ℃, and the curing time is 8-12 h. Through the curing process treatment, the mixing can be more uniform, and the flocculation effect is further improved.
Preferably, the stirring temperature after adding the poly dimethyl diallyl ammonium chloride emulsion is 50-60 ℃, the stirring speed is 80-120r/min, and the stirring time is 1-1.5 h; through the limitation to temperature and stirring speed, the mixing speed of the poly dimethyl diallyl ammonium chloride is improved, and meanwhile, the damage to effective components in the poly dimethyl diallyl ammonium chloride caused by overhigh temperature can be prevented.
Preferably, the poly dimethyl diallyl ammonium chloride emulsion accounts for 1-3 wt% of the raw material solution;
preferably, the solid content of the poly dimethyl diallyl ammonium chloride emulsion is more than or equal to 40 wt%.
The preparation method of the ferric aluminum silicate flocculant is simple to operate, the synergistic effect of the aluminum salt and the ferric salt is effectively exerted by combining the aluminum salt and the ferric salt, and the prepared flocculant has a good sewage treatment effect.
Compared with the prior art, the invention has the beneficial effects that:
(1) the aluminum silicate ferric flocculant can combine the advantages of strong aluminum salt adsorption capacity, large formed alum floc, quick dense precipitation, quick ferric salt hydrolysis speed and dense alum floc, and effectively play the synergistic effect of aluminum salt and ferric salt;
(2) by using industrial sodium silicate, the generated polysilicic acid can increase the molecular weight of the medicament, so that the formed alum floc is faster and more compact;
(3) the poly dimethyl diallyl ammonium chloride has obvious effects on flocculation, decoloration, sterilization and organic matter removal, and can play a good role in synergism and synergism by combining the poly dimethyl diallyl ammonium chloride with aluminum salt and ferric salt.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
880 kilograms of water is added into a reaction kettle, stirring is started, the rotating speed is 80r/min, the temperature is raised to 60 ℃, and 120 kilograms of industrial sodium silicate is slowly added to prepare a sodium silicate solution.
Adding 750 kg of waste acid liquor into another reaction kettle, adding 53 kg of industrial aluminum hydroxide, starting stirring, heating to 125 ℃ at the rotating speed of 80r/min, under the pressure of 0.2MPa, reacting for 4 hours, cooling to 20 ℃, slowly adding 85 kg of industrial ferric trichloride, controlling the molar ratio of aluminum to iron to be 1:1, and uniformly stirring to prepare a waste acid mixed solution.
Slowly adding a sodium silicate solution into a waste acid mixed solution while stirring to prepare a raw material solution, controlling the molar ratio of (aluminum + iron)/silicon to be 1:1, rotating at a speed of 80r/min, and reacting for 4 hours at 60 ℃; cooling to 50 ℃, curing for 8h, and then slowly adding 20 kg of poly dimethyl diallyl ammonium chloride emulsion while stirring, wherein the rotating speed is 80r/min, and the adding amount is controlled to be 1% of the raw material solution. Stirring for 1 h.
16-18 wt% of hydrochloric acid and 1.5-3 wt% of aluminum trichloride in the waste acid solution; the content of aluminum trioxide in the industrial-grade aluminum hydroxide is more than or equal to 64 wt%; ferric trichloride in the industrial-grade ferric trichloride is more than or equal to 96 wt%; the solid content of the poly dimethyl diallyl ammonium chloride emulsion is more than or equal to 40 wt%.
Example 2
880 kg of water is added into a reaction kettle, stirring is started, the rotating speed is 90r/min, the temperature is raised to 65 ℃, and 120 kg of industrial sodium silicate is slowly added to prepare a sodium silicate solution.
Adding 750 kg of waste acid liquor into another reaction kettle, adding 50 kg of industrial aluminum hydroxide, starting stirring, heating to 125 ℃ at a rotation speed of 90r/min, reacting for 4 hours under a pressure of 0.2MPa, cooling to 25 ℃, slowly adding 80 kg of industrial ferric trichloride, controlling the molar ratio of aluminum to iron to be 1:1, and uniformly stirring to prepare a waste acid mixed solution.
Slowly adding a sodium silicate solution into a waste acid mixed solution while stirring to prepare a raw material solution, controlling the molar ratio of (aluminum + iron)/silicon to be 1:1, rotating at the speed of 90r/min, and reacting for 4 hours at the temperature of 70 ℃; cooling to 50 ℃, curing for 9h, then slowly adding 25 kg of poly dimethyl diallyl ammonium chloride emulsion while stirring, rotating at 90r/min, controlling the adding amount to be 1% of the raw material solution, and stirring for 1 h.
16-18 wt% of hydrochloric acid and 1.5-3 wt% of aluminum trichloride in the waste acid solution; the content of aluminum trioxide in the industrial-grade aluminum hydroxide is more than or equal to 64 wt%; ferric trichloride in the industrial-grade ferric trichloride is more than or equal to 96 wt%; the solid content of the poly dimethyl diallyl ammonium chloride emulsion is more than or equal to 40 wt%.
Example 3
880 kilograms of water is added into a reaction kettle, stirring is started, the rotating speed is 100 revolutions per minute, the temperature is raised to 70 ℃, 120 kilograms of industrial sodium silicate is slowly added to prepare a sodium silicate solution with the mass concentration of 12 percent.
Adding 750 kg of waste acid liquor into another reaction kettle, adding 52 kg of industrial aluminum hydroxide, starting stirring, heating to 130 ℃ at a rotating speed of 100 rpm, under the pressure of 0.3MPa, reacting for 4 hours, cooling to 30 ℃, slowly adding 80 kg of industrial ferric trichloride, controlling the molar ratio of aluminum to iron to be 1.1:1, and uniformly stirring to prepare a waste acid mixed solution.
Slowly adding a sodium silicate solution into a waste acid mixed solution while stirring to prepare a raw material solution, controlling the molar ratio of (aluminum + iron)/silicon to be 1.1:1, rotating at the speed of 100 r/min, and reacting for 5h at the temperature of 75 ℃; cooling to 55 ℃, curing for 10h, then slowly adding 35 kg of poly dimethyl diallyl ammonium chloride emulsion while stirring, rotating at 100 r/min, and controlling the adding amount to be 2% of the raw material solution. Stirring for 1.3 h.
16-18 wt% of hydrochloric acid and 1.5-3 wt% of aluminum trichloride in the waste acid solution; the content of aluminum trioxide in the industrial-grade aluminum hydroxide is more than or equal to 64 wt%; ferric trichloride in the industrial-grade ferric trichloride is more than or equal to 96 wt%; the solid content of the poly dimethyl diallyl ammonium chloride emulsion is more than or equal to 40 wt%.
Example 4
880 kilograms of water is added into a reaction kettle, stirring is started, the rotating speed is 110 r/min, the temperature is raised to 80 ℃, 120 kilograms of industrial sodium silicate is slowly added to prepare a sodium silicate solution with the mass concentration of 12 percent.
Adding 780 kg of waste acid liquid into another reaction kettle, adding 60 kg of industrial aluminum hydroxide, starting stirring, heating to 130 ℃ at the rotation speed of 110 r/min, reacting for 4 hours under the pressure of 0.35MPa, cooling to 40 ℃, slowly adding 85 kg of industrial ferric trichloride, controlling the molar ratio of aluminum to iron to be 1.1:1, and uniformly stirring to prepare a waste acid mixed solution.
Slowly adding a sodium silicate solution into a waste acid mixed solution while stirring to prepare a raw material solution, controlling the molar ratio of (aluminum + iron)/silicon to be 1.2:1, rotating at a speed of 110 revolutions per minute, and reacting for 5 hours at 80 ℃; cooling to 60 ℃, curing for 11h, then slowly adding 55 kg of poly dimethyl diallyl ammonium chloride emulsion while stirring, rotating at 110 r/min, and controlling the adding amount to be 3% of the raw material solution. Stirring for 1.5 h.
16-18 wt% of hydrochloric acid and 1.5-3 wt% of aluminum trichloride in the waste acid solution; the content of aluminum trioxide in the industrial-grade aluminum hydroxide is more than or equal to 64 wt%; ferric trichloride in the industrial-grade ferric trichloride is more than or equal to 96 wt%; the solid content of the poly dimethyl diallyl ammonium chloride emulsion is more than or equal to 40 wt%.
Example 5
880 kilograms of water is added into a reaction kettle, stirring is started, the rotating speed is 120 revolutions per minute, the temperature is increased to 80 ℃, and 120 kilograms of industrial sodium silicate is slowly added to prepare a sodium silicate solution with the mass concentration of 12 percent.
Adding 750 kg of waste acid liquor into another reaction kettle, adding 53 kg of industrial aluminum hydroxide, starting stirring, heating to 135 ℃ at a rotation speed of 120r/min, reacting for 4 hours under a pressure of 0.35MPa, cooling to 40 ℃, slowly adding 82 kg of industrial ferric trichloride, controlling the molar ratio of aluminum to iron to be 1.2:1, and uniformly stirring to prepare a waste acid mixed solution.
Slowly adding a sodium silicate solution into a waste acid mixed solution while stirring to prepare a raw material solution, controlling the molar ratio of (aluminum + iron)/silicon to be 1.2:1, rotating at the speed of 120r/min, and reacting for 6h at the temperature of 90 ℃; cooling to 60 ℃, curing for 12h, then slowly adding 56 kg of poly dimethyl diallyl ammonium chloride emulsion while stirring, rotating at 120r/min, and controlling the adding amount to be 3% of the raw material solution. Stirring for 1.5 h.
16-18 wt% of hydrochloric acid and 1.5-3 wt% of aluminum trichloride in the waste acid solution; the content of aluminum trioxide in the industrial-grade aluminum hydroxide is more than or equal to 64 wt%; ferric trichloride in the industrial-grade ferric trichloride is more than or equal to 96 wt%; the solid content of the poly dimethyl diallyl ammonium chloride emulsion is more than or equal to 40 wt%.
Example 6
The specific embodiment is the same as example 4 except that the molar ratio of (aluminum + iron)/silicon is controlled to 0.5: 1.
Example 7
The specific embodiment is the same as example 4 except that the molar ratio of (aluminum + iron)/silicon is controlled to 3: 1.
Example 8
The procedure was as in example 4, except that 100 kg of the polydiallyldimethylammonium chloride emulsion was added.
Comparative example 1
The specific embodiment is the same as example 4 except that the polydimethyldiallylammonium chloride emulsion is not added.
Comparative example 2
The specific embodiment is the same as example 4 except that 50 kg of industrial sodium silicate is added.
Comparative example 3
The specific embodiment is the same as example 4 except that the molar ratio of aluminum/iron is controlled to 0.5: 1.
Comparative example 4
The specific embodiment is the same as example 4 except that the molar ratio of aluminum/iron is controlled to 5: 1.
Experimental example 1
Taking oily sewage of a Xinjiang oilfield united station as an experiment, sequentially measuring the wastewater treatment capacity of the flocculant by taking 220mg/L of raw water suspended matters and 55mg/L of oil content for the ferric aluminum silicate flocculants of the examples 1-8 and the comparative examples 1-4, simultaneously selecting a certain commercially available polymeric ferric aluminum silicate flocculant, taking 13 beakers of 2000ml, adding 1L of sewage into each beaker, respectively adding 500ppm of the ferric aluminum silicate flocculant of the examples 1-8 and the comparative examples 1-4 and the commercially available flocculant into the sewage, stirring for 3min at the rotating speed of 120r/min, then settling for 1h, and measuring the oil content of each group of wastewater and the suspended matters in the wastewater after the settling is finished, wherein the obtained results are shown in Table 1.
TABLE 1 post-sedimentation index test results for the examples
As can be seen from the above table, the ferric aluminum silicate flocculant of the present invention has high removal rate of oil stains and suspended matters, and has better sewage treatment effect, especially in examples 1-5, the removal rate of the oil content after treatment basically reaches more than 90%, the removal rate of the suspended matters reaches more than 95%, and the field requirements are well met.
Comparing example 4 with examples 6-7, it can be seen that the removal rate of oil contamination and suspended matter of example 4 is significantly better than that of examples 6-7, indicating that the molar ratio of (aluminum + iron)/silicon needs to be controlled within a certain range to ensure excellent oil content and suspended matter removal rate.
Comparing example 4 with example 8 and comparative example 1, it can be seen that the oil content removal rate and the suspended matter removal rate are significantly reduced when the poly dimethyl diallyl ammonium chloride is not added, and the oil content removal rate and the suspended matter removal rate are also adversely affected when the poly dimethyl diallyl ammonium chloride is added too much, which indicates that the addition amount of the poly dimethyl diallyl ammonium chloride also needs to be controlled within a certain range, so that the poly dimethyl diallyl ammonium chloride can be matched with other components to achieve excellent oil content and suspended matter removal effects.
Comparing example 4 with comparative example 2, it can be seen that the effect of removing oil content and suspended matter of the prepared iron aluminum silicate flocculant is obviously reduced when the amount of the added industrial sodium silicate is reduced, which indicates that the adding amount of the industrial sodium silicate also needs to be controlled within a certain range to ensure excellent oil content and suspended matter removal rate.
Comparing example 4 with comparative examples 3-4, it can be seen that the removal rate of oil stain and suspended matter of example 4 is significantly better than that of comparative examples 3-4, which shows that the molar ratio of aluminum/iron needs to be controlled within a certain range to ensure excellent oil content and suspended matter removal rate.
In a word, the ferric aluminum silicate flocculant has better sewage treatment effect, the removal rate of the oil content after treatment reaches more than 90%, the removal rate of suspended matters reaches more than 95%, and the requirement on sewage treatment can be met.
While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
Claims (10)
1. An aluminum ferric silicate flocculant is characterized by being mainly prepared from a raw material solution and poly dimethyl diallyl ammonium chloride emulsion serving as raw materials; the raw material solution comprises a sodium silicate solution and a waste acid mixed solution;
wherein the mass percentage concentration of the sodium silicate solution is more than 12 wt%; the molar ratio of aluminum to iron of the waste acid mixed solution is (1-1.2): 1.
2. The ferric aluminum silicate flocculant of claim 1, wherein the molar ratio of (aluminum + iron)/silicon of the raw material solution is (1-1.2): 1.
3. The ferric aluminum silicate flocculant of claim 1, wherein the composition of the waste acid mixed solution comprises technical grade aluminum hydroxide, a waste acid liquor and technical grade ferric chloride.
4. The ferric aluminum silicate flocculant of claim 3, wherein the waste acid solution contains 16 to 18 wt% of hydrochloric acid and 1.5 to 3 wt% of aluminum trichloride; the content of aluminum trioxide in the industrial-grade aluminum hydroxide is more than or equal to 64 wt%; the ferric trichloride in the industrial-grade ferric trichloride is more than or equal to 96 wt%.
5. A method for preparing an aluminum ferric silicate flocculant according to any one of claims 1 to 4, comprising the steps of:
mixing the sodium silicate solution and the waste acid mixed solution, stirring uniformly, curing, adding the poly dimethyl diallyl ammonium chloride emulsion, and stirring and mixing.
6. The method of claim 5, wherein the method of preparing the spent acid mixed solution comprises the steps of: dissolving industrial aluminum hydroxide in a waste acid solution, adding industrial ferric trichloride, and uniformly stirring;
preferably, the stirring speed after the industrial-grade aluminum hydroxide is added is 80-120r/min, the temperature is 125-135 ℃, the pressure is 0.2-0.35 MPa, and the stirring time is 4 h; the stirring temperature after the addition of the industrial-grade ferric trichloride was 125-135 ℃.
7. The method according to claim 5, characterized in that the sodium silicate solution is prepared as follows: dissolving industrial sodium silicate in water to prepare a sodium silicate solution;
preferably, the dissolving temperature is 60-80 ℃, and the dissolving and stirring speed is 80-120 r/min;
preferably, the soluble silicate content of the industrial sodium silicate is 98.5 wt%.
8. The preparation method of the aluminum ferric silicate flocculating agent according to claim 5, characterized in that the mixing temperature of the sodium silicate solution and the waste acid mixed solution is 60-90 ℃, the stirring speed is 80-120r/min, and the stirring time is 4-6 h.
9. The method for preparing the aluminum ferric silicate flocculant according to claim 5, wherein the curing temperature is 50-60 ℃ and the curing time is 8-12 h.
10. The preparation method of the ferric aluminum silicate flocculant according to claim 5, wherein the stirring temperature after adding the poly dimethyl diallyl ammonium chloride emulsion is 50-60 ℃, the stirring speed is 80-120r/min, and the stirring time is 1-1.5 h;
preferably, the poly dimethyl diallyl ammonium chloride emulsion accounts for 1-3 wt% of the raw material solution;
preferably, the solid content of the poly dimethyl diallyl ammonium chloride emulsion is more than or equal to 40 wt%.
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| CN108178264A (en) * | 2018-01-11 | 2018-06-19 | 武汉理工大学 | A kind of poly aluminium iron silicate and modified alta-mud composite flocculation agent |
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2020
- 2020-12-17 CN CN202011495219.5A patent/CN112607839A/en active Pending
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| US4867789A (en) * | 1984-11-08 | 1989-09-19 | Canon Kabushiki Kaisha | Flocculant purification of ink |
| JP2005254119A (en) * | 2004-03-11 | 2005-09-22 | Keiichiro Asaoka | Flocculant and production method therefor |
| CN104085969A (en) * | 2014-07-17 | 2014-10-08 | 广西平果锋华科技有限公司 | Method for preparing compound type multi-element flocculating agent aluminum ferric sulfate chloride polysilicate by utilizing waste acid |
| CN108178264A (en) * | 2018-01-11 | 2018-06-19 | 武汉理工大学 | A kind of poly aluminium iron silicate and modified alta-mud composite flocculation agent |
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| 刘景光: ""聚硅酸铝铁混凝剂的制备及其对印染废水混凝效能研究"", 《中国优秀博硕士学位论文全文数据库(硕士) 工程科技Ⅰ辑 (月刊)》 * |
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Application publication date: 20210406 |