CN1160253C - Production process of aluminium iron sulfate polymer as composite water purifying agent - Google Patents
Production process of aluminium iron sulfate polymer as composite water purifying agent Download PDFInfo
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- CN1160253C CN1160253C CNB011332484A CN01133248A CN1160253C CN 1160253 C CN1160253 C CN 1160253C CN B011332484 A CNB011332484 A CN B011332484A CN 01133248 A CN01133248 A CN 01133248A CN 1160253 C CN1160253 C CN 1160253C
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- sulfuric acid
- ferric sulfate
- water
- polymeric aluminum
- purifying agent
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Abstract
The present invention relates to a production process of aluminium iron sulfate polymer of a composite water purifying agent. Waste slag containing iron oxide, which is generated after the sulfuric acid production of a sulfuric acid plant is used as a raw material. Water, slag and sulfuric acid are orderly added into a reaction kettle to react by chemistry. Then, isometric water is added to dilute, and reactant after diluted is discharged in a precipitation tank. A small amount of flocculant is added so that the reactant naturally settles, and solid and liquid are separated. The clear solution is filled in a polymerizing container, H2O2 is added to be quickly oxidized and polymerized with the clear solution, and thus, the finished liquor of the aluminium iron sulfate polymer is obtained. The finished liquor is evaporated and dehydrated, and is naturally crystallized after discharged. Then, the crystal is crushed into a granular shape or a powder shape, and the solid aluminium iron sulfate polymer is obtained. The present invention uses the waste slag as the raw material so that production cost is low, and the process is simple. Aluminum and iron are compounded so that a sewerage treatment effect is better than that of a simple substance product, and the effect that waste is used for controlling the waste is achieved. The present invention has the characteristics of high forming speed of a flocculation body, large density of a flocculation group, high settling speed, etc. in the water treatment process.
Description
(I) technical field
The invention belongs to a production process of a water purifying agent, and particularly relates to a production process for producing a composite water purifying agent polymeric aluminum ferric sulfate by using waste residues containing ferric oxide in a sulfuric acid plant.
(II) background of the invention
The aluminum and iron high molecular inorganic polymer water purifying agent is a novel chemical industry researched and developed from seventies to ninety years, and plays a great role in improving the quality of life of people and controlling the environment. The water purifying agent has various varieties and different production processes. At present, the waste residue of the sulfuric acid plant is discharged at will, which causes environmental pollution and urgently needs to be treated. Chinese patent CN1219507A discloses a one-step production process of a polymeric ferric sulfate solid water purifying agent, which utilizes iron and steel plants and sulfuric acid plants to react iron-containing waste residues with an oxidizing agent to prepare the polymeric ferric sulfate as the iron-based solid water purifying agent. The application is only in a laboratory test stage, in the embodiment, sulfuric acid is added into a beaker containing ferric oxide waste residues in a graded manner, the reaction temperature needs to be controlled at 40-70 ℃, the reaction temperature is not easy to master in actual production, in addition, no oxidant is added in the production process, ferrous iron cannot be converted into ferric iron, the polymerization effect cannot be achieved, substances in the iron residues are impure, solid and liquid are not separated, water insoluble substances are too high, the water purification effect is influenced, and the industrial production is not realized.
Disclosure of the invention
The invention aims to solve the technical problem that the compound water purifying agent polymeric aluminum ferric sulfate is industrially produced by using waste residues containing ferric oxide in a sulfuric acid plant, has high water purifying quality and good effect, is used for treating domestic water, industrial wastewater and municipal sewage, and achieves the purposes of treating waste by waste, reducing treatment cost and reducing environmental pollution.
The technical solution of the invention is as follows: the waste residue produced after sulfuric acid production in sulfuric acid plant is used as raw materialFe2O340-70% of Al2O315-20 percent of content, 60-80 percent of leaching rate, 45-50 percent of complex acid concentration and 92.5-98 percent of sulfuric acid concentration.
The chemical reaction equation of the invention is as follows:
the production process comprises the following steps: determination of Fe in waste slag by chemical analysis2O3And Al2O3According to the stoichiometric amount, calculating the theoretical sulfuric acid dosage required by the replacement reaction, calculating the actual dosage of the sulfuric acid according to the leaching rate of the slag, and calculating the water consumption according to the concentration of the complex acid;
firstly, adding water into a reaction kettle, pouring slag into the reaction kettle, then adding sulfuric acid, and sealing the reaction kettle for natural reaction for two hours; adding the same amount of water into the reactant for dilution, then discharging the diluted reactant into a settling tank, adding 0.01 per mill of polyacrylamide for natural settling, precipitating for 2-4 hours, performing solid-liquid separation, and controlling the pH value of clear liquid to be about 2: pumping the clear solution into a polymerization vessel, based on Fe2+H with the weight of 25-30 per mill is added2O2，H2O2Spraying into clear liquid from the bottom of the container, and performing rapid oxidative polymerization with the clear liquid to obtain Fe2+The content is less than or equal to 0.2 percent, and the polymeric aluminum ferric sulfate finished product liquid is obtained.
And (3) washing the material after the finished product liquid is extracted, adding secondary washing water into the reaction kettle to react with sulfuric acid, diluting the reactant with the primary washing water, reusing the washing water, and discharging slag to a slag field.
And (3) evaporating and dehydrating the polymeric aluminum ferric sulfate finished product liquid, controlling the Baume degree to be 58-60 ℃, naturally crystallizing after discharging, and crushing into granules or powder to obtain the solid polymeric aluminum ferric sulfate.
The leaching rate of the slag is generally 60 to 80 percent at normal temperature and normal pressure, and is determined according to samples in production.
The invention takes the waste residue as the raw material, has low production cost, simple process, convenient operation, normal temperature and pressure, energy and electricity conservation, no secondary pollution and high production efficiency; the aluminum and the iron are compounded, and the sewage treatment effect is better than that of a simple substance product.
(IV) detailed description of the preferred embodiments
The waste residue after the sulfuric acid production in the sulfuric acid plant is used as the raw material, and Fe is contained in the waste residue2O345% of Al2O3Comprises15 percent of the leaching amount, 60 percent of leaching rate, 45 percent of complex acid concentration and 92.5 percent of sulfuric acid concentration.
According to the stoichiometric proportion, the weight ratio of the water, the slag and the sulfuric acid is 99: 100: 81.
990kg of water is added into a reaction kettle, 1000kg of slag is poured into the reaction kettle, 810kg of sulfuric acid is added into the reaction kettle, and the mixture naturally reacts for two hours; adding water with the same amount for dilution, then discharging the reactant into a settling tank, adding 10g of flocculating agent polyacrylamide for natural settling, precipitating for 2-4 hours, carrying out solid-liquid separation, and controlling the pH value of clear liquid to be about 2; pumping the clear solution into a polymerization vessel, based on Fe2+Adding about 25-30 kg of H according to the content calculation2O2，H2O2Spraying into clear liquid from the bottom of the container, and performing rapid oxidative polymerization with the clear liquid to obtain Fe2+The content is less than or equal to 0.2 percent, and 1500-1600 kg of polymeric aluminum ferric sulfate finished product liquid is obtained.
The composite water purifying agent polymerized aluminum ferric sulfate produced by the invention has the appearance of red brown viscous transparent liquid or red brown solid. The quality indexes of the liquid product are as follows:
density: (20 ℃ C.) g/cm3Not less than 1.43; iron (Fe)3+) The percentage is more than or equal to 5.5; aluminum (Al)2O3) 5% or more, reducing substance (Fe)2+) The percentage is less than or equal to 0.2, and the basicity percent is 7-9.
The polymeric ions in the invention can quickly play the roles of charge neutralization and flocculation bridging from a high starting point, has the characteristics of high flocculating constituent forming speed, high floc density, high settling speed and the like in the water treatment process, and has good removal effect on COD, BOD, suspension, chromaticity, microorganisms and the like in various sewage.
Claims (4)
1. A process for preparing the composite water purifying agent polyaluminium ferric sulfate from the waste dregs generated in sulfuric acid production in sulfuricacid plant2O340-70% of Al2O315-20% of content, 60-80% of leaching rate, 45-50% of complex acid concentration and 92.5-98% of sulfuric acid concentration;
the production process is characterized by comprising the following steps: firstly, adding water into a reaction kettle, then pouring slag into the reaction kettle, then adding sulfuric acid into the reaction kettle, and sealing the reaction kettle for natural reaction for two hours: adding the same amount of water into the reactant for dilution, then discharging the diluted reactant into a settling tank, adding 0.01 per mill of polyacrylamide for natural settling, precipitating for 2-4 hours, carrying out solid-liquid separation, and controlling the pH value of clear liquid to be about 2; pumping the clear solution into a polymerization vessel, based on Fe2+H with the weight of 25-30 per mill is added2O2，H2O2Spraying into clear liquid from the bottom of the container, and performing rapid oxidative polymerization with the clear liquid to obtain Fe2+The content is less than or equal to 0.2 percent, and the polymeric aluminum ferric sulfate finished product liquid is obtained.
2. The process for producing the composite water purifying agent polymeric aluminum ferric sulfate according to claim 1, wherein the material after the finished product liquid is extracted is washed with water, the secondary washing water is added into the reaction kettle to react with sulfuric acid, and the primary washing water is used for diluting the reactant.
3. The process for producing the composite water purifying agent polymeric aluminum ferric sulfate according to claim 1, wherein the polymeric aluminum ferric sulfate finished product liquid is evaporated and dehydrated, the baume degree is controlled to be 58-60 degrees, the polymeric aluminum ferric sulfate finished product liquid is naturally crystallized after being discharged, and then the polymeric aluminum ferric sulfate finished product liquid is crushed into granules or powder, so that the solid polymeric aluminum ferric sulfate is obtained.
4. The process for producing polymeric aluminum ferric sulfate as composite water purifying agent of claim 1, wherein the weight ratio of the water, the slag and the sulfuric acid is 99: 100: 81.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011332484A CN1160253C (en) | 2001-09-15 | 2001-09-15 | Production process of aluminium iron sulfate polymer as composite water purifying agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011332484A CN1160253C (en) | 2001-09-15 | 2001-09-15 | Production process of aluminium iron sulfate polymer as composite water purifying agent |
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| Publication Number | Publication Date |
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| CN1337356A CN1337356A (en) | 2002-02-27 |
| CN1160253C true CN1160253C (en) | 2004-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB011332484A Expired - Fee Related CN1160253C (en) | 2001-09-15 | 2001-09-15 | Production process of aluminium iron sulfate polymer as composite water purifying agent |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101973589B (en) * | 2010-11-05 | 2012-05-30 | 浙江工业大学 | Preparation method of polymeric ferric aluminous sulphate by using pyrite wastewater and treatment sludge |
| CN102173491B (en) * | 2011-03-18 | 2012-07-25 | 福建省长汀金龙稀土有限公司 | Process for comprehensively utilizing rare-earth ore leaching waste liquid and calcining waste heat in rare earth production |
| CN102786129B (en) * | 2012-08-16 | 2014-01-29 | 刘耀红 | Aluminum ferric sulfate water purifier and preparation method thereof |
| CN104689698B (en) * | 2015-02-13 | 2017-07-25 | 北京三聚环保新材料股份有限公司 | A kind of method and apparatus of use bodied ferric sulfate absorption cleaning hydrogen sulfide |
| CN104692467B (en) * | 2015-02-13 | 2017-01-25 | 北京三聚环保新材料股份有限公司 | Preparation method of polyferric sulfate |
| CN113880208A (en) * | 2021-10-26 | 2022-01-04 | 广州市芦苇环保科技有限责任公司 | Polymeric aluminum ferric sulfate composite water purifying agent and preparation process thereof |
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