CN111606402A - Efficient preparation method of water treatment polyaluminum sulfate chloride - Google Patents
Efficient preparation method of water treatment polyaluminum sulfate chloride Download PDFInfo
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- CN111606402A CN111606402A CN202010422299.5A CN202010422299A CN111606402A CN 111606402 A CN111606402 A CN 111606402A CN 202010422299 A CN202010422299 A CN 202010422299A CN 111606402 A CN111606402 A CN 111606402A
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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
Abstract
The invention provides a preparation method of high-efficiency water treatment polyaluminium chloride polysulfide, wherein the polyaluminium chloride polysulfide additionally contains sulfate radical coordination groups, and the stability and flocculation effect of the polyaluminium chloride are superior to those of polyaluminium chloride; in the existing preparation formula of the polyaluminum sulfate chloride, the surfactant is added, the coagulation capacity of the product is increased, the removal rate of raw water UV254, DOC and turbidity is high, the concentration of residual aluminum in effluent is low, the preparation conditions are optimized, high temperature and high pressure are not needed, the requirement on production equipment is low, the production flow is short, and the cost is low.
Description
Technical Field
The invention relates to the field of water treatment agents, in particular to a preparation method of high-efficiency water treatment polyalumnium chloride.
Technical Field
Polyaluminum Polysulfides (PAC) are also known as aluminum chlorohydrate or aluminum hydroxysulfate. It is made up by using aluminium ash or aluminium-containing mineral as raw material and adopting acid-dissolving or alkali-dissolving process. The specifications of products are inconsistent due to different raw materials and production processes. Molecular formula [ Al2(OH)nCl6-n]m in m is polymerization degree, and the monomer is hydroxyl complex Al of aluminum2(OH)nCl6-n. Usually, n is 1 to 5, and m is 10 or less. For example Al16(OH)40Cl8Namely, the polymer or polynuclear complex with m being 8 and n being 5 forms polymer cation after being dissolved in water, and plays a role in electrically neutralizing and bridging colloidal particles in water. The mechanism of action is similar to that of aluminium sulphate, but its efficacy is superior to that of aluminium sulphate. For example, the amount of aluminum sulfate added is less than that of aluminum sulfate, and the pH value of water is more adaptable. In fact, the polysulphide chlorinationThe aluminum can be regarded as aluminum chloride AlCl3Gradually converted into Al (OH) through hydrolysis and polymerization under certain conditions3Various intermediates in the precipitation process.
The existing method for producing the polyaluminium chloride polysulphide generally has the defects of high requirement on preparation conditions, requirement on heating condition at the temperature of more than 100 ℃, poor water purification capability and the like.
Disclosure of Invention
Aiming at the defects, the invention provides the efficient preparation method of the water treatment polyalumnium chloride, which optimizes the preparation conditions, does not need high temperature and high pressure, has low requirements on production equipment, short production flow and low cost.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of high-efficiency water treatment polyaluminum chloride comprises the following steps:
(1) preparing 1.0-1.5mol/L AlCl3In solution and according to SO4 2-/Al3+In a molar ratio of 1:5 to 1:15 to AlCl3Adding concentrated sulfuric acid into the solution; preparing 1.0-2.0mol/L NaOH solution, mixing the NaOH solution with SO under 0.2-0.4Mpa4 2-AlCl of3Solution rapid mixing, OH control-/Al3+The molar ratio is between 1:2 and 1:5, the total aluminum concentration is between 0.6 and 0.8mol/L, the temperature is between 60 and 90 ℃, and the mixture is stirred for 15 to 30min at the speed of 500-;
(2) naturally cooling the mixed solution A to normal temperature, adding 1-5g/L of sodium polyacrylate, 2-6g/L of surface modifier, 5-10g/L of ammonium sulfide and stirring at the normal pressure of 1000r/min for 30-60min to obtain mixed solution B;
(3) and evaporating the water content of the mixed solution B at the low temperature of 40-60 ℃, stirring at the speed of 100-200r/min, stopping heating when precipitation just occurs, and cooling to the normal temperature to obtain the high-efficiency water-treated polyaluminum sulfate chloride. The method has mild conditions, low requirements on equipment and high preparation speed.
Further, in the efficient preparation method of the water treatment polyaluminum chloride, the AlCl is adopted3Polyaluminium chloride may be used instead.
Further, the above preparation method of the high-efficiency water-treatment polyaluminum chloride, the surface modifier is selected from one or more of titanate coupling agent, surfactant, organic polymer treating agent and inorganic modifier. The surface modifier is added to increase the wettability, emulsibility and foamability of the polyaluminum chloride sulfate and enhance the coagulation effect.
Further, in the preparation method of the high-efficiency water-treatment polyaluminum chloride, the surfactant is one or more selected from sodium dodecyl benzene sulfonate, stearic acid, lecithin, alkyl glucoside and sorbitan fatty acid.
Further, in the preparation method of the high-efficiency water-treatment polyaluminum chloride, the surfactant is sorbitan fatty acid. Experiments prove that the fatty acid sorbitan has the most enhanced coagulation effect on the polyaluminum chloride polysulfide.
Further, the preparation method of the high-efficiency water treatment polyaluminum chloride comprises the following steps:
(1) preparing 1.2mol/L AlCl3In solution and according to SO4 2-/Al3+Molar ratio of 1:10 to AlCl3Adding concentrated sulfuric acid into the solution; preparing 1.5mol/L NaOH solution, mixing the NaOH solution with SO under 0.3Mpa4 2-AlCl of3Solution rapid mixing, OH control-/Al3+The molar ratio is 1: 3, stirring the mixture at the speed of 800r/min for 25min at the temperature of 75 ℃ and the total aluminum concentration of 0.7mol/L to obtain a mixed solution A;
(2) naturally cooling the mixed solution A to normal temperature, adding 1-5g/L of sodium polyacrylate, 4g/L of sorbitan fatty acid, 7.5g/L of ammonium sulfide, and stirring at 800r/min under normal pressure for 45min to obtain mixed solution B;
(3) and (3) evaporating water from the mixed solution B at low temperature of 50 ℃, stirring at the speed of 150r/min, stopping heating until precipitation just occurs, and cooling to normal temperature to obtain the high-efficiency water-treated polyaluminum sulfate chloride.
Further, the preparation method of the high-efficiency water treatment polyaluminum chloride is applied to the treatment process of the oily wastewater.
According to the technical scheme, the preparation method has the advantages of simplicity, practicability and low cost, the addition of the surfactant is added in the existing preparation formula of the polyaluminum sulfide chloride, the coagulation capacity of the product is improved, the removal rate of raw water UV254, DOC and turbidity is high, the concentration of residual aluminum in effluent is low, the preparation condition is optimized, high temperature and high pressure are not needed, the requirement on production equipment is low, the production flow is short, and the preparation method is worthy of wide application of sewage treatment enterprises.
Detailed Description
The invention will be further elucidated by means of several specific examples, which are intended to be illustrative only and not limiting.
Example 1
A preparation method of high-efficiency water treatment polyaluminum chloride comprises the following steps:
(1) preparing 1.0mol/L AlCl3In solution and according to SO4 2-/Al3+Ratio of 1: 5mol ratio to AlCl3Adding concentrated sulfuric acid into the solution; preparing 1.0mol/L NaOH solution, mixing the NaOH solution with SO under 0.2MPa4 2-AlCl of3Solution rapid mixing, OH control-/Al3+The molar ratio is 1:2, the total aluminum concentration is 0.6mol/L, the temperature is 60 ℃, and the mixture is stirred for 15min at the speed of 500r/min to obtain a mixed solution A;
(2) naturally cooling the mixed solution A to normal temperature, adding 1g/L of sodium polyacrylate, 2g/L of sodium dodecyl benzene sulfonate, 5g/L of ammonium sulfide, and stirring at 500r/min at normal pressure for 30min to obtain mixed solution B;
(3) and (3) evaporating water from the mixed solution B at low temperature of 40 ℃, stirring at the speed of 100r/min, stopping heating until precipitation just occurs, and cooling to normal temperature to obtain the high-efficiency water-treated polyaluminum sulfate chloride.
Example 2
A preparation method of high-efficiency water treatment polyaluminum chloride comprises the following steps:
(1) preparing 1.2mol/L AlCl3In solution and according to SO4 2-/Al3+Molar ratio of1:10 ratio to AlCl3Adding concentrated sulfuric acid into the solution; preparing 1.5mol/L NaOH solution, mixing the NaOH solution with SO under 0.3Mpa4 2-AlCl of3Solution rapid mixing, OH control-/Al3+The molar ratio is 1: 3, stirring the mixture at the speed of 800r/min for 25min at the temperature of 75 ℃ and the total aluminum concentration of 0.7mol/L to obtain a mixed solution A;
(2) naturally cooling the mixed solution A to normal temperature, adding 1-5g/L of sodium polyacrylate, 4g/L of sorbitan fatty acid, 7.5g/L of ammonium sulfide, and stirring at 800r/min under normal pressure for 45min to obtain mixed solution B;
(3) and (3) evaporating water from the mixed solution B at low temperature of 50 ℃, stirring at the speed of 150r/min, stopping heating until precipitation just occurs, and cooling to normal temperature to obtain the high-efficiency water-treated polyaluminum sulfate chloride.
Example 3
The preparation method of the high-efficiency water treatment polyaluminum chloride is characterized by comprising the following steps:
(1) preparing 1.5mol/L AlCl3In solution and according to SO4 2-/Al3+Molar ratio of 1:15 to AlCl3Adding concentrated sulfuric acid into the solution; preparing 2.0mol/L NaOH solution, mixing the NaOH solution with SO under 0.4Mpa4 2-AlCl of3Solution rapid mixing, OH control-/Al3+The molar ratio is between 1:5, the total aluminum concentration is 0.8mol/L, the temperature is 90 ℃, and the mixture is stirred for 30min at the speed of 1000r/min to obtain a mixed solution A;
(2) naturally cooling the mixed solution A to normal temperature, adding 5g/L sodium polyacrylate, 6g/L alkyl glucoside and 10g/L ammonium sulfide, and stirring at 1000r/min under normal pressure for 60min to obtain mixed solution B;
(3) and (3) evaporating water from the mixed solution B at a low temperature of 60 ℃, stirring at the speed of 200r/min, stopping heating until precipitation is just precipitated, and cooling to the normal temperature to obtain the high-efficiency water-treated polyaluminum sulfate chloride.
Example 4
Test example
The highly effective water-treated polyaluminum polysulfides obtained in examples 1 to 3 were tested in comparison with commercially available polyaluminum polysulfides for water treatment under the same conditions, and the results are shown in Table 1.
TABLE 1 test results
| Test item | Raw water | Example 1 | Example 2 | Example 3 | Commercial contrast |
| PH | 8.4 | 7.4 | 7.2 | 7.3 | 7.6 |
| UV254(1/cm) | 1.742 | 0.074 | 0.064 | 0.071 | 0.091 |
| DOC(mg/L) | 24.362 | 1.574 | 1.421 | 1.524 | 2.574 |
| Turbidity (NTU) | 574.2 | 0.74 | 0.61 | 0.69 | 0.97 |
| Residual aluminum (mg/L) | Is free of | 0.14 | 0.11 | 0.14 | 0.27 |
According to the test results, the water treatment polyaluminum chloride prepared by the method has high removal rate of UV254, DOC and turbidity of raw water, and the concentration of residual aluminum in effluent is low.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (7)
1. The preparation method of the high-efficiency water treatment polyaluminum chloride is characterized by comprising the following steps:
(1) preparing 1.0-1.5mol/L AlCl3In solution and according to SO4 2-/Al3+In a molar ratio of 1:5 to 1:15 to AlCl3Adding concentrated sulfuric acid into the solution; preparing 1.0-2.0mol/L NaOH solution, mixing the NaOH solution with SO under 0.2-0.4Mpa4 2-AlCl of3Solution rapid mixing, OH control-/Al3+The molar ratio is between 1:2 and 1:5, and the total ratio isThe aluminum concentration is 0.6-0.8mol/L, the temperature is 60-90 ℃, and the mixture is stirred for 15-30min at the speed of 500-;
(2) naturally cooling the mixed solution A to normal temperature, adding 1-5g/L of sodium polyacrylate, 2-6g/L of surface modifier, 5-10g/L of ammonium sulfide and stirring at the normal pressure of 1000r/min for 30-60min to obtain mixed solution B;
(3) and evaporating the water content of the mixed solution B at the low temperature of 40-60 ℃, stirring at the speed of 100-200r/min, stopping heating when precipitation just occurs, and cooling to the normal temperature to obtain the high-efficiency water-treated polyaluminum sulfate chloride.
2. The method for preparing the high-efficiency water-treatment polyaluminum polysulfidochloride of claim 1, wherein the AlCl is used as a carrier for the water-treatment polyaluminum polysulfidochloride3Polyaluminium chloride may be used instead.
3. The method for preparing high-efficiency water-treated polyaluminum polysulfidochloride according to claim 1, wherein the surface modifier is one or more selected from titanate coupling agents, surfactants, organic polymer treating agents and inorganic modifiers.
4. The method as claimed in claim 3, wherein the surfactant is selected from one or more of sodium dodecylbenzene sulfonate, stearic acid, lecithin, alkyl glucoside, and sorbitan fatty acid.
5. The method for preparing the high-efficiency water-treatment polyaluminum polysulphide chloride as claimed in claim 4, wherein the surfactant is sorbitan fatty acid.
6. The method for preparing high-efficiency water-treatment polyaluminum polysulphides of claim 1, comprising the following steps:
(1) preparing 1.2mol/L AlCl3In solution and according to SO4 2-/Al3+Molar ratio of 1:10 to AlCl3Adding concentrated sulfuric acid into the solution; preparing 1.5mol/L NaOH solution, mixing the NaOH solution with SO under 0.3Mpa4 2-AlCl of3Solution rapid mixing, OH control-/Al3+The molar ratio is 1: 3, stirring the mixture at the speed of 800r/min for 25min at the temperature of 75 ℃ and the total aluminum concentration of 0.7mol/L to obtain a mixed solution A;
(2) naturally cooling the mixed solution A to normal temperature, adding 1-5g/L of sodium polyacrylate, 4g/L of sorbitan fatty acid, 7.5g/L of ammonium sulfide, and stirring at 800r/min under normal pressure for 45min to obtain mixed solution B;
(3) and (3) evaporating water from the mixed solution B at low temperature of 50 ℃, stirring at the speed of 150r/min, stopping heating until precipitation just occurs, and cooling to normal temperature to obtain the high-efficiency water-treated polyaluminum sulfate chloride.
7. The use of the method of any one of claims 1-6 for the preparation of a highly effective water treatment polyaluminum chloride for the treatment of oily wastewater.
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| CN115180741A (en) * | 2022-07-19 | 2022-10-14 | 上海城市水资源开发利用国家工程中心有限公司 | Green pollution-free reinforced coagulation method suitable for water plant |
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