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Method for preparing synthesized high iron-based silicon compound high-molecular coagulant adopting flyash extract
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A technology of composite polymer and fly ash, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problem of no obvious effect of heavy metal removal, and achieve the effect of saving treatment cost, less dosage and stable chemical performance.
Inactive Publication Date: 2011-11-09
UNIV OF JINAN
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In terms of treatment effect, the removal rate of turbidity, chroma, and COD is high, and the effect is remarkable in the application of printing and dyeing wastewater and papermaking wastewater, but it has no obvious effect on the removal of heavy metals in industrial wastewater, so it is used in heavy metal industrial wastewater. processing applications with certain limitations
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Embodiment 1
[0014] Take 600 parts of fly ash and soak them in 200 parts of potassium hydroxide solution with a concentration of 20g / L, then heat in a water bath for 20 hours, take out the extract, mix it with 1:2 sulfuric acid, adjust the pH value to 1, let it stand for 1 hour, and heat it to 40°C , fully reacted with 198 parts of tripotassium sodium ferrate, added 2 parts of disodium hydrogen phosphate, and matured for 1 hour to obtain a high-iron-based silicon composite inorganic polymer coagulant.
[0015] The treatment effect of the coagulant prepared in this example on lead-containing industrial wastewater: the removal rate of COD was 74%, the chromaticity was reduced to 3, the removal rate of SS was 85%, and the removal rate of lead was 89%.
Embodiment 2
[0017] Take 620 parts of fly ash and soak them in 210 parts of potassium hydroxide solution with a concentration of 25g / L, then heat in a water bath for 26 hours, take out the extract, mix it with 1:2 sulfuric acid, adjust the pH value to 1.5, let it stand for 2 hours, and heat it to 50°C , fully reacted with 167 parts of sodium ferrate, added 3 parts of sodium citrate, and matured for 2 hours to obtain a high-iron-based silicon composite inorganic polymer coagulant.
[0018] The treatment effect of the coagulant prepared in this example on lead-containing industrial wastewater: the removal rate of COD is 80%, the chromaticity is reduced to 2, the removal rate of SS is 90%, and the removal rate of lead is 92%.
Embodiment 3
[0020] Take 640 parts of fly ash and soak them in 220 parts of potassium hydroxide solution with a concentration of 35g / L, heat in a water bath for 30 hours, take out the extract, mix it with 1:2 sulfuric acid, adjust the pH value to 2, let it stand for 2.5 hours, and heat it to 55 ℃, fully reacted with 136 parts of tripotassium sodium ferrate, added 4 parts of sodium tartrate, and matured for 2.5 hours to obtain a high-iron-based silicon composite inorganic polymer coagulant.
[0021] The treatment effect of the coagulant prepared in this example on lead-containing industrial wastewater: the COD removal rate was 90%, the chroma was reduced to 2, the SS removal rate was 95%, and the lead removal rate was 96%.
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Abstract
A method for preparing synthesized high iron-based silicon compound inorganic high-molecular coagulant adopting flyash extract comprises the following steps: first taking 600-650 parts of flyash by weight, soaking the flyash in 200-250 parts of potassium hydroxide solution at a concentration of 20-40g / L by weight, then heating the flyash in water bath for 20-40h, mixing obtained flyash extract with sulfuric acid in a ratio of 1:2, adjusting pH value from 1 to 3, standing for 1-3h, heating the mixture to 40-60 DEG C, enabling the mixture to fully react with 95-198 parts of ferrate by weight, then adding 2-5 parts of stabilizing agents by weight and carrying out aging for 1-3h, thus preparing the compound inorganic high-molecular coagulant. The compound inorganic high-molecular coagulant prepared by using the method takes flyash as the raw material, dispenses with high temperature roasting, enjoys simple and practicable preparation technology and low production cost, contains no substances harmful to organisms, can substantially improve the removal effect of heavy metals and ensures the removal rate of lead to reach 89-99%.
Description
technical field [0001] The invention relates to a preparation method of a composite polymer coagulant, in particular to a preparation method of a high-iron-based silicon composite inorganic polymer coagulant synthesized from a fly ash extract. Background technique [0002] At present, the composite inorganic polymer coagulant has been widely used in the water treatment industry. In terms of treatment effect, the removal rate of turbidity, chroma, and COD is high, and the effect is remarkable in the application of printing and dyeing wastewater and papermaking wastewater, but it has no obvious effect on the removal of heavy metals in industrial wastewater, so it is used in heavy metal industrial wastewater. Processing applications have certain limitations. Contents of the invention [0003] In order to overcome the deficiency of the composite inorganic polymer coagulant in removing heavy metals, the invention provides a high-iron-based silicon composite inorganic polymer c...
Claims
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