CN115974184A - Preparation method and application of water purifying agent produced by using aluminum ash - Google Patents
Preparation method and application of water purifying agent produced by using aluminum ash Download PDFInfo
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Abstract
The invention relates to the field of purifying agents, in particular to a preparation method and application of a purifying agent produced by using aluminum ash, wherein the preparation method comprises the following steps: preparing raw materials, mixing the raw materials for reaction, and carrying out acidolysis reaction. The water purifying agent prepared by the preparation method has high water purifying rate, the obtained water purifying agent does not generate any new solid waste in the water purifying process, the post-treatment is simple, and the cost is low; the method effectively solves the problem of resource utilization of the industrial hazardous waste aluminum ash, not only solves the problem of environmental pollution, but also realizes sustainable utilization of resources, and no new wastewater is generated in the whole process.
Description
Technical Field
The invention relates to the technical field of water purifying agents, and particularly relates to a preparation method and application of a water purifying agent produced by using aluminum ash.
Background
The aluminum ash is a product in the metallurgical process of electrolytic aluminum, cast aluminum and recycled aluminum. The aluminum oxide can account for more than 50 percent of the total content of metal and nonmetal oxides, wherein the nitrogen element in the aluminum ash is mainly in the form of aluminum nitride, and the aluminum ash also contains certain fluoride and other impurities, and the presence of the impurities can generate toxic irritant gases of ammonia and combustible explosive gases of hydrogen and methane when the aluminum ash is placed in a humid environment. The state also specifies that hazardous solid waste is to be followed for storage and transport with respect to aluminum ash waste. And, the state also imposes a discharge tax on dangerous solid wastes accordingly. Therefore, the technology for harmless treatment of the aluminum ash is positively significant to the environment and enterprises.
The patent with the application number of 201510865151.8 discloses a method for preparing a composite water purifying agent by using waste aluminum ash, which comprises the steps of mixing the waste aluminum ash as a raw material with distilled water, filtering and air-drying, adding limestone powder for calcination, heating and mixing with sulfuric acid and manganese dioxide, standing and filtering to obtain a filtrate, adding ferric sulfate and glycerol for heating and stirring, adding sodium oxide for hydrolytic polymerization, standing and curing, filtering and drying to obtain the composite water purifying agent. However, the waste gas ammonia gas generated in the process is not effectively treated, harmful fluoride impurities are not removed, and the resource utilization degree is not high.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a preparation method and application of a water purifying agent produced by using aluminum ash.
The invention provides a preparation method for producing a water purifying agent by using aluminum ash, which comprises the following steps: preparing raw materials, mixing the raw materials for reaction, and carrying out acidolysis reaction.
As a preferable technical scheme, the preparation of the raw materials comprises the preparation of aluminum ash, the preparation of a catalyst and the preparation of calcium chloride;
1) The preparation of the aluminum ash is to store the ton bags in a closed aluminum ash warehouse, place the ton bags in a dust-free ton bag unpacking machine by a forklift during production, and unpack for later use;
2) The preparation of the catalyst is that the liquid finished catalyst is transported outside the plant and is directly put into a catalyst blending tank for standby;
3) The preparation of the calcium chloride is to add solid calcium chloride into a calcium chloride blending tank through a charging hopper, and simultaneously pump quantitative fresh water to blend into 30-40 wt% calcium chloride solution for later use.
Preferably, the catalyst is one of sodium hydroxide aqueous solution, potassium hydroxide aqueous solution and potassium carbonate aqueous solution;
preferably, the catalyst is an aqueous sodium hydroxide solution, and the concentration of the aqueous sodium hydroxide solution is 10wt% -20wt%.
Preferably, the concentration of the aqueous sodium hydroxide solution is 15wt%.
Preferably, the preparation of the calcium chloride is to add solid calcium chloride into a calcium chloride blending tank through a charging hopper, and simultaneously pump quantitative fresh water to blend into a 35wt% calcium chloride solution for standby.
Preferably, the raw material mixing reaction is hydrolysis reaction and defluorination and desalination reaction;
preferably, the hydrolysis reaction is to perform ball milling, screening and pulping treatment on the unpacked aluminum ash, then pump the unpacked aluminum ash into a hydrolysis kettle by an aluminum ash slurry tank liquid outlet pump, control the mass ratio of the aluminum ash to water to be 1:2, and add the prepared catalyst, wherein the adding amount of the catalyst is 3-5% of the mass of the aluminum ash to perform the hydrolysis reaction. Preferably, the adding amount of the catalyst is 4% of the mass of the aluminum ash.
Preferably, the hydrolysis reaction process is heated by adopting a steam jacket heating mode, the temperature is raised at the speed of 5 ℃/min, the final heating temperature is controlled to be 95-100 ℃, and the heat preservation time is 0.5-1h.
Preferably, the hydrolysis reaction process is heated by adopting a steam jacket heating mode, the temperature is raised at the speed of 5 ℃/min, the final heating temperature is controlled to be 98 ℃, and the heat preservation time is 0.7h.
Preferably, after the hydrolysis reaction is finished, the hydrolysate automatically flows into a hydrolysate temporary storage tank, and is pumped to a hydrolysate filter press by a hydrolysis hydraulic filter pump for filter pressing to obtain filter-pressed hydrolysis filtrate A and filter-pressed hydrolysis residues B; and (3) continuously and repeatedly cleaning the filter-pressed hydrolysis residues B for 2-3 times by using fresh water, temporarily storing the cleaned cleaning liquid into a temporary storage tank of hydrolysis residue cleaning liquid, pumping the temporary storage tank into another hydrolysis kettle for hydrolysis reaction, and obtaining filter-pressed hydrolysis filtrate C and filter-pressed hydrolysis residues D after the hydrolysis reaction is finished.
In the application of the invention, through two hydrolysis reactions, the aluminum nitride in the aluminum ash is eliminated more fully.
Preferably, the defluorination and desalination reaction is to pump the hydrolysis filtrate a and the hydrolysis filtrate C obtained after the hydrolysis reaction into a defluorination tank, add the calcium chloride solution obtained in the raw material preparation for defluorination and desalination reaction, and then filter press-press the calcium fluoride filter residue by a defluorination filter press to obtain the defluorinated filtrate E.
Preferably, the mass ratio of the hydrolysis filtrate to the calcium chloride solution is 1:1.2-1.5, and the reaction time is 0.5-0.8h; preferably, the mass ratio of the hydrolysis filtrate to the calcium chloride solution is 1:1.4, the reaction time is 0.65h.
Preferably, the raw material mixing reaction further comprises an ammonia recovery process, wherein the ammonia recovery process comprises the steps of enabling ammonia-containing waste gas generated by evaporation in the hydrolysis kettle to enter a condenser, cooling the ammonia-containing waste gas to 50 ℃ through circulating cooling water to obtain a condensate, enabling the condensate and the defluorinated filtrate E to enter an ammonia distillation tower together, evaporating ammonia in the solution through steam stripping to obtain ammonia gas and an ammonia-free solution, mixing the evaporated ammonia gas and the uncondensed ammonia-containing waste gas, and then enabling the mixture to enter an ammonia spraying absorption device to prepare ammonia water;
in the application of the invention, the ammonia gas generated in the preparation method process is fully converted into ammonia water by adopting a specific process, so that the emission standard is reached, and no waste gas is generated.
As a preferable technical scheme, the acidolysis reaction is to add the hydrolysis residue D into a pulping tank, mix and pulp the hydrolysis residue D with an ammonia-free solution, control the weight ratio of the hydrolysis residue D to the ammonia-free solution to be 1.5-1.8, pump the pulped hydrolysis residue to an acidolysis kettle for acidolysis reaction, and then obtain the solid water purifying agent by polymerization, sedimentation, drying and crushing. Preferably, the weight ratio of the hydrolysis residue D to the ammonia-free solution is 1.65.
Preferably, the weight ratio of the addition amount of the hydrochloric acid in the acidolysis reaction to the addition amount of the hydrolyzed slag after pulping is 1:1, and the hydrochloric acid is a 20wt% hydrochloric acid solution; the temperature in the polymerization process is controlled to be 80 ℃, the polymerization time is 2.5h, the settling time in the settling process is 15-18h, and the drying and crushing process is to dry the sediment by using an oven and then crush the sediment into particles with the particle size of 50-60 meshes.
Preferably, the settling time in the settling process is 16h, and the crushing process after drying is to crush the sediment into particles with the particle size of 55 meshes after drying the sediment by using an oven.
The invention also provides application of the preparation method for producing the water purifying agent by using the aluminum ash, and the prepared water purifying agent is used for treating domestic sewage.
Preferably, the average range of COD of the domestic sewage is 250-400mg/L, the average range of ammonia nitrogen is 30-60mg/L, and the average range of total phosphorus is 2-6mg/L.
The invention brings the following beneficial effects: 1) The water purifying agent prepared by the preparation method has high water purifying rate, the obtained water purifying agent does not generate any new solid waste in the water purifying process, the post-treatment is simple, and the cost is low; 2) The resource utilization of the industrial hazardous waste aluminum ash is effectively solved, the problem of environmental pollution is solved, the sustainable utilization of resources is realized, and no new wastewater is generated in the whole process; 3) The industrial resource reutilization of the aluminum ash is achieved through specific process parameters; 4) By reasonably controlling the weight ratio of the hydrolysis residues to the ammonia-free solution, the water purifying agent can fully utilize the ammonia-free solution and ensure the water purifying rate of the prepared water purifying agent.
Detailed Description
Example 1
The embodiment 1 of the invention provides a preparation method for producing a water purifying agent by using aluminum ash, which comprises the following steps: preparing raw materials, mixing the raw materials for reaction, and carrying out acidolysis reaction.
The raw material preparation comprises the preparation of aluminum ash, the preparation of a catalyst and the preparation of calcium chloride;
1) The preparation of the aluminum ash is to store the ton bags in a closed aluminum ash warehouse, place the ton bags in a dust-free ton bag unpacking machine by a forklift during production, and unpack for later use;
2) The preparation of the catalyst is that the liquid finished catalyst is transported outside the plant and is directly put into a catalyst blending tank for standby;
3) The preparation of the calcium chloride is to add solid calcium chloride into a calcium chloride blending tank through a charging hopper, and simultaneously pump quantitative fresh water to blend into a 35wt% calcium chloride solution for later use.
The catalyst is sodium hydroxide aqueous solution, and the concentration of the sodium hydroxide aqueous solution is 15wt%.
The raw material mixing reaction is hydrolysis reaction and defluorination and desalination reaction;
the hydrolysis reaction is to perform ball milling, screening and pulping treatment on the unpacked aluminum ash, then pump the unpacked aluminum ash into a hydrolysis kettle by an aluminum ash slurry tank liquid outlet pump, control the mass ratio of the aluminum ash to water to be 1:2, add a prepared catalyst, wherein the addition amount of the catalyst is 4% of the mass of the aluminum ash, and perform the hydrolysis reaction.
The adding amount of the aluminum ash is 200kg.
And heating in a steam jacket heating mode in the hydrolysis reaction process, raising the temperature at the speed of 5 ℃/min, controlling the final heating temperature to be 98 ℃, and keeping the temperature for 0.7h.
After the hydrolysis reaction is finished, automatically flowing the hydrolysate into a hydrolysate temporary storage tank, pumping the hydrolysate to a hydrolysate filter press by a hydrolysis hydraulic filter pump for filter pressing, and obtaining filter-pressed hydrolysis filtrate A and filter-pressed hydrolysis residues B; and (3) continuously and repeatedly cleaning the filter-pressed hydrolysis residues B for 3 times by using fresh water, temporarily storing the cleaned cleaning liquid into a temporary storage tank of the hydrolysis residue cleaning liquid, pumping the temporary storage tank into another hydrolysis kettle for hydrolysis reaction, and obtaining filter-pressed hydrolysis filtrate C and filter-pressed hydrolysis residues D after the hydrolysis reaction is finished.
And the defluorination and desalination reaction is to pump hydrolysis filtrate A and hydrolysis filtrate C obtained after the hydrolysis reaction into a defluorination tank, add calcium chloride solution obtained in the raw material preparation for defluorination and desalination reaction, and remove calcium fluoride filter residues after filter pressing by a defluorination filter press to obtain defluorination filtrate E.
The mass ratio of the hydrolysis filtrate to the calcium chloride solution is 1:1.4, the reaction time is 0.65h.
The raw material mixing reaction also comprises an ammonia recovery process, wherein the ammonia recovery process comprises the steps of enabling ammonia-containing waste gas generated by evaporation of the hydrolysis kettle to enter a condenser and cooling the ammonia-containing waste gas to 50 ℃ through circulating cooling water to obtain condensate, enabling the condensate and filtrate E after defluorination to enter an ammonia still, evaporating ammonia in the solution through steam stripping to obtain ammonia gas and ammonia-free solution, mixing the evaporated ammonia gas and uncondensed ammonia-containing waste gas, and enabling the mixture to enter an ammonia spraying absorption device to prepare ammonia water;
and the acidolysis reaction is to add the hydrolysis residue D into a pulping tank, mix the hydrolysis residue D with an ammonia-free solution, carry out pulping treatment, control the weight ratio of the hydrolysis residue D to the ammonia-free solution to be 1.65, pump the pulped hydrolysis residue to an acidolysis kettle for acidolysis reaction, and then carry out polymerization, sedimentation and drying and crushing to obtain the solid water purifying agent.
The weight ratio of the addition amount of the hydrochloric acid in the acidolysis reaction to the addition amount of the pulped hydrolysis residue is 1:1, and the hydrochloric acid is a 20wt% hydrochloric acid solution; the temperature in the polymerization process is controlled to be 80 ℃, the polymerization time is 2.5h, the settling time in the settling process is 16h, and the crushing process after drying is to crush the sediment into particles with the particle size of 55 meshes after drying by using an oven.
Example 1 provides the use of a process for the production of a water purification agent from aluminium ash for the treatment of domestic sewage.
The COD of the domestic sewage is 324mg/L, the ammonia nitrogen is 50mg/L, and the total phosphorus is 5mg/L.
Example 2
The embodiment 2 of the invention provides a preparation method for producing a water purifying agent by using aluminum ash, which comprises the following steps: preparing raw materials, mixing the raw materials for reaction, and carrying out acidolysis reaction.
The raw material preparation comprises the preparation of aluminum ash, the preparation of a catalyst and the preparation of calcium chloride;
1) The preparation of the aluminum ash is to store the ton bags in a closed aluminum ash warehouse, place the ton bags in a dust-free ton bag unpacking machine by a forklift during production, and unpack for later use;
2) The preparation of the catalyst is that the liquid finished catalyst is transported outside the plant and is directly put into a catalyst blending tank for standby;
3) The preparation of the calcium chloride is to add solid calcium chloride into a calcium chloride blending tank through a charging hopper, and simultaneously pump quantitative fresh water to blend into a 30wt% calcium chloride solution for later use.
The catalyst is sodium hydroxide aqueous solution, and the concentration of the sodium hydroxide aqueous solution is 10wt%.
The raw material mixing reaction is hydrolysis reaction and defluorination and desalination reaction;
the hydrolysis reaction is to perform ball milling, screening and pulping treatment on the unpacked aluminum ash, then pump the unpacked aluminum ash into a hydrolysis kettle by an aluminum ash slurry tank liquid outlet pump, control the mass ratio of the aluminum ash to water to be 1:2, add a prepared catalyst, wherein the addition amount of the catalyst is 3% of the mass of the aluminum ash, and perform the hydrolysis reaction.
The adding amount of the aluminum ash is 200kg.
In the hydrolysis reaction process, a steam jacket heating mode is adopted for heating, the temperature is raised at the speed of 5 ℃/min, the final heating temperature is controlled to be 95 ℃, and the heat preservation time is 1h.
After the hydrolysis reaction is finished, automatically flowing the hydrolysate into a hydrolysate temporary storage tank, pumping the hydrolysate to a hydrolysate filter press by a hydrolysis hydraulic filter pump for filter pressing, and obtaining filter-pressed hydrolysis filtrate A and filter-pressed hydrolysis residues B; and (3) continuously and repeatedly cleaning the filter-pressed hydrolysis residues B for 3 times by using fresh water, temporarily storing the cleaned cleaning liquid into a temporary storage tank of the hydrolysis residue cleaning liquid, pumping the temporary storage tank into another hydrolysis kettle for hydrolysis reaction, and obtaining filter-pressed hydrolysis filtrate C and filter-pressed hydrolysis residues D after the hydrolysis reaction is finished.
And the defluorination desalting reaction is to pump hydrolysis filtrate A and hydrolysis filtrate C obtained after the hydrolysis reaction into a defluorination tank, add calcium chloride solution obtained in the raw material preparation for defluorination desalting reaction, and then remove calcium fluoride filter residues after filter pressing by a defluorination filter press to obtain defluorinated filtrate E.
The mass ratio of the hydrolysis filtrate to the calcium chloride solution is 1.2, and the reaction time is 0.8h.
The raw material mixing reaction also comprises an ammonia recovery process, wherein the ammonia recovery process comprises the steps of enabling ammonia-containing waste gas generated by evaporation of the hydrolysis kettle to enter a condenser and cooling the ammonia-containing waste gas to 50 ℃ through circulating cooling water to obtain condensate, enabling the condensate and filtrate E after defluorination to enter an ammonia still, evaporating ammonia in the solution through steam stripping to obtain ammonia gas and ammonia-free solution, mixing the evaporated ammonia gas and uncondensed ammonia-containing waste gas, and enabling the mixture to enter an ammonia spraying absorption device to prepare ammonia water;
and the acidolysis reaction is to add the hydrolysis residue D into a pulping tank, mix the hydrolysis residue D with an ammonia-free solution, carry out pulping treatment, control the weight ratio of the hydrolysis residue D to the ammonia-free solution to be 1.5, pump the pulped hydrolysis residue to an acidolysis kettle for acidolysis reaction, and then carry out polymerization, sedimentation and drying and crushing to obtain the solid water purifying agent.
The weight ratio of the addition amount of the hydrochloric acid in the acidolysis reaction to the addition amount of the pulped hydrolysis residue is 1:1, and the hydrochloric acid is a 20wt% hydrochloric acid solution; the temperature in the polymerization process is controlled to be 80 ℃, the polymerization time is 2.5h, the settling time in the settling process is 15h, and the crushing process after drying is to crush the sediment into particles with the particle size of 50 meshes after drying the sediment by using an oven.
Example 2 provides the use of aluminum ash in a process for producing a water purification agent for domestic sewage treatment.
The COD of the domestic sewage is 324mg/L, the ammonia nitrogen is 50mg/L, and the total phosphorus is 5mg/L.
Example 3
The embodiment 3 of the invention provides a preparation method for producing a water purifying agent by using aluminum ash, which comprises the following steps: preparing raw materials, mixing the raw materials for reaction, and carrying out acidolysis reaction.
The raw material preparation comprises the preparation of aluminum ash, the preparation of a catalyst and the preparation of calcium chloride;
1) The preparation of the aluminum ash is to store the ton bags in a closed aluminum ash warehouse, place the ton bags in a dust-free ton bag unpacking machine by a forklift during production, and unpack for later use;
2) The preparation of the catalyst comprises the steps of directly putting a liquid finished catalyst into a catalyst blending tank for standby after off-site transportation;
3) The preparation of the calcium chloride is to add solid calcium chloride into a calcium chloride blending tank through a charging hopper, and simultaneously pump quantitative fresh water to blend into a 40wt% calcium chloride solution for later use.
The catalyst is sodium hydroxide aqueous solution, and the concentration of the sodium hydroxide aqueous solution is 20wt%.
The raw material mixing reaction is hydrolysis reaction and defluorination and desalination reaction;
the hydrolysis reaction is to perform ball milling, screening and pulping treatment on the unpacked aluminum ash, then pump the unpacked aluminum ash into a hydrolysis kettle by an aluminum ash slurry tank liquid outlet pump, control the mass ratio of the aluminum ash to water to be 1:2, add the prepared catalyst, and perform hydrolysis reaction, wherein the addition amount of the catalyst is 5% of the mass of the aluminum ash.
The adding amount of the aluminum ash is 200kg.
And heating in a steam jacket heating mode in the hydrolysis reaction process, raising the temperature at the speed of 5 ℃/min, controlling the final heating temperature to be 100 ℃, and keeping the temperature for 0.5h.
After the hydrolysis reaction is finished, automatically flowing the hydrolysate into a hydrolysate temporary storage tank, pumping the hydrolysate to a hydrolysate filter press by a hydrolysis hydraulic filter pump for filter pressing, and obtaining filter-pressed hydrolysis filtrate A and filter-pressed hydrolysis residues B; and (3) continuously and repeatedly cleaning the filter-pressed hydrolysis residue B for 3 times by using fresh water, temporarily storing the cleaned cleaning liquid into a temporary storage tank of the hydrolysis residue cleaning liquid, pumping the cleaning liquid into another hydrolysis kettle by using a pump to perform hydrolysis reaction, and obtaining filter-pressed hydrolysis filtrate C and filter-pressed hydrolysis residue D after the hydrolysis reaction is finished.
And the defluorination desalting reaction is to pump hydrolysis filtrate A and hydrolysis filtrate C obtained after the hydrolysis reaction into a defluorination tank, add calcium chloride solution obtained in the raw material preparation for defluorination desalting reaction, and then remove calcium fluoride filter residues after filter pressing by a defluorination filter press to obtain defluorinated filtrate E.
The mass ratio of the hydrolysis filtrate to the calcium chloride solution is 1.5, and the reaction time is 0.5h.
The raw material mixing reaction also comprises an ammonia recovery process, wherein the ammonia recovery process comprises the steps of enabling ammonia-containing waste gas generated by evaporation of the hydrolysis kettle to enter a condenser and cooling the ammonia-containing waste gas to 50 ℃ through circulating cooling water to obtain condensate, enabling the condensate and filtrate E after defluorination to enter an ammonia still, evaporating ammonia in the solution through steam stripping to obtain ammonia gas and ammonia-free solution, mixing the evaporated ammonia gas and uncondensed ammonia-containing waste gas, and enabling the mixture to enter an ammonia spraying absorption device to prepare ammonia water;
and the acidolysis reaction is to add the hydrolysis residue D into a pulping tank, mix the hydrolysis residue D with an ammonia-free solution, carry out pulping treatment, control the weight ratio of the hydrolysis residue D to the ammonia-free solution to be 1.8, pump the pulped hydrolysis residue to an acidolysis kettle for acidolysis reaction, and then carry out polymerization, sedimentation and drying and crushing to obtain the solid water purifying agent.
The weight ratio of the addition amount of the hydrochloric acid in the acidolysis reaction to the addition amount of the pulped hydrolysis residue is 1:1, and the hydrochloric acid is a 20wt% hydrochloric acid solution; the temperature in the polymerization process is controlled to be 80 ℃, the polymerization time is 2.5h, the settling time in the settling process is 18h, and the crushing process after drying is to use an oven to dry the sediment and then crush the sediment into particles with the particle size of 60 meshes.
Embodiment 3 provides the use of the aluminum ash in a process for producing a water purifying agent for domestic sewage treatment.
The COD of the domestic sewage is 324mg/L, the ammonia nitrogen is 50mg/L, and the total phosphorus is 5mg/L.
Comparative example 1
The invention provides a comparative example 1 for preparing a water purifying agent from aluminum ash, which is similar to example 1 in specific implementation mode, and is characterized in that the acidolysis reaction is to add hydrolysis residue D into a beating tank and mix the hydrolysis residue D with an ammonia-free solution for beating, and the weight ratio of the hydrolysis residue D to the ammonia-free solution is controlled to be 1:2.
Comparative example 2
The invention provides a comparative example 2 for preparing a water purifying agent by using aluminum ash, which is prepared by the following steps of adding hydrolysis residue D into a pulping tank, mixing the hydrolysis residue D with an ammonia-free solution, and pulping, wherein the weight ratio of the hydrolysis residue D to the ammonia-free solution is controlled to be 1:1.
And (3) performance testing:
the water purifying effect test was performed on the water purifying agents obtained in examples and comparative examples, and the water purifying agent was added to 1L of domestic sewage sample at an amount of 10wt%, and the test was performed after the water purifying agent was added and stirred uniformly for 1 hour. COD content is tested according to the standard GB11914, ammonia nitrogen content is tested according to the standard HJ 536-2009, and total phosphorus content is tested according to the standard GB 11893. The test results are shown in Table 1, and the domestic sewage samples correspond to the water quality condition data before purification, and the examples and comparative examples correspond to the water quality condition data after purification.
TABLE 1
| COD(mg/L) | Ammonia nitrogen (mg/L) | Total phosphorus (mg/L) | |
| Domestic sewage sample | 324 | 50 | 5 |
| Example 1 | 156 | 35 | 1.1 |
| Example 2 | 159 | 37 | 1.2 |
| Example 3 | 162 | 38 | 1.1 |
| Comparative example 1 | 178 | 43 | 2.2 |
| Comparative example 2 | 175 | 44 | 2.5 |
Claims (10)
1. A preparation method for producing a water purifying agent by using aluminum ash is characterized by comprising the following steps: preparing raw materials, mixing the raw materials for reaction, and carrying out acidolysis reaction.
2. The method for preparing the water purifying agent from the aluminum ash as claimed in claim 1, wherein the raw material preparation comprises preparation of the aluminum ash, preparation of a catalyst, preparation of calcium chloride;
1) The preparation of the aluminum ash is to store ton bags in a closed aluminum ash warehouse, place the ton bags in a dust-free ton bag unpacking machine by a forklift during production, and unpack the ton bags for later use;
2) The preparation of the catalyst is that the liquid finished catalyst is transported outside the plant and is directly put into a catalyst blending tank for standby;
3) The preparation of the calcium chloride is to add solid calcium chloride into a calcium chloride blending tank through a charging hopper, and simultaneously pump quantitative fresh water to blend into 30-40 wt% calcium chloride solution for later use.
3. The method for preparing the water purifying agent from the aluminum ash as claimed in claim 1, wherein the raw material mixing reaction is hydrolysis reaction and defluorination and desalination reaction.
4. The method for preparing the water purifying agent from the aluminum ash as claimed in claim 3, wherein the hydrolysis reaction comprises ball milling, sieving, pulping the unpacked aluminum ash, pumping the unpacked aluminum ash into a hydrolysis kettle by an aluminum ash trough and liquid outlet pump, controlling the mass ratio of the aluminum ash to water to be 1:2, and adding the prepared catalyst, wherein the adding amount of the catalyst is 3-5% of the mass of the aluminum ash, so as to perform the hydrolysis reaction.
5. The method for preparing the water purifying agent by using the aluminum ash as claimed in claim 4, wherein after the hydrolysis reaction is finished, the hydrolysate automatically flows into the hydrolysate temporary storage tank, and is pumped to a hydrolysate filter press by a hydrolysis hydraulic filter pump for filter pressing, so that filter-pressed hydrolysis filtrate A and filter-pressed hydrolysis residue B are obtained; and (3) continuously and repeatedly cleaning the filter-pressed hydrolysis residue B with fresh water for 2-3 times, temporarily storing the cleaned cleaning liquid into a temporary storage tank of the hydrolysis residue cleaning liquid, pumping the cleaning liquid into another hydrolysis kettle by a pump to perform hydrolysis reaction, and obtaining filter-pressed hydrolysis filtrate C and filter-pressed hydrolysis residue D after the hydrolysis reaction is finished.
6. The method for preparing the water purifying agent by using the aluminum ash as claimed in claim 3, wherein the defluorination and desalination reaction comprises the steps of pumping a hydrolysis filtrate A and a hydrolysis filtrate C obtained after the hydrolysis reaction into a defluorination tank, adding a calcium chloride solution obtained in the raw material preparation for defluorination and desalination reaction, and then carrying out pressure filtration by a defluorination filter press to remove calcium fluoride filter residues so as to obtain a defluorinated filtrate E.
7. The method for preparing the water purifying agent by using the aluminum ash as claimed in claim 3, wherein the raw material mixing reaction further comprises an ammonia recovery process, the ammonia recovery process comprises the steps of enabling ammonia-containing waste gas generated by evaporation in the hydrolysis kettle to enter a condenser, cooling the ammonia-containing waste gas to 50 ℃ through circulating cooling water to obtain a condensate, enabling the condensate and the filtrate E after defluorination to enter an ammonia still, evaporating ammonia in the solution through steam stripping to obtain ammonia gas and ammonia-free solution, mixing the evaporated ammonia gas and the uncondensed ammonia-containing waste gas, and then enabling the mixture to enter an ammonia spray absorption device to prepare the ammonia water.
8. The method as claimed in claim 1, wherein the acidolysis is carried out by adding the hydrolysis residue D into a pulping tank, mixing with an ammonia-free solution, pulping, controlling the weight ratio of the hydrolysis residue D to the ammonia-free solution to be 1.5-1.8, pumping the pulped hydrolysis residue into an acidolysis kettle, carrying out acidolysis, polymerizing, settling, drying, and crushing to obtain the solid water purifying agent.
9. The method for preparing the water purifying agent by using the aluminum ash as claimed in claim 8, wherein the weight ratio of the addition amount of the hydrochloric acid in the acidolysis reaction to the addition amount of the hydrolyzed sludge after pulping is 1:1, and the hydrochloric acid is a 20wt% hydrochloric acid solution; the temperature in the polymerization process is controlled to be 80 ℃, the polymerization time is 2.5h, the settling time in the settling process is 15-18h, and the drying and crushing process is to dry the sediment by using an oven and then crush the sediment into particles with the particle size of 50-60 meshes.
10. Use of the process according to any one of claims 1 to 9 for the production of a water purification agent from aluminium ash for the treatment of domestic sewage.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117585700A (en) * | 2024-01-17 | 2024-02-23 | 中国科学院过程工程研究所 | Method for denitrification, defluorination and quality-classifying utilization of secondary aluminum ash |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117585700A (en) * | 2024-01-17 | 2024-02-23 | 中国科学院过程工程研究所 | Method for denitrification, defluorination and quality-classifying utilization of secondary aluminum ash |
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