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CN-121020780-B - Metal-based water purifying agent for sewage treatment and preparation method thereof

CN121020780BCN 121020780 BCN121020780 BCN 121020780BCN-121020780-B

Abstract

The invention discloses a metal-based water purifying agent for sewage treatment and a preparation method thereof, which belong to the technical field of water purifying agent processing and are used for solving the technical problem that the sedimentation performance and stability of the water purifying agent in the prior art are to be further improved; according to the invention, the crushed sludge blocks and the activated bamboo scraps after microwave treatment are modified by a zinc chloride solution to obtain pretreated sludge, the pretreated sludge micro powder is modified by calcium carbonate, and nano ferroferric oxide particles are further combined to prepare the modified sludge-based carbon, and the modified sludge-based carbon is combined with the metal-based gel regenerated by coal gasification fine slag to generate the metal-based water purifying agent, so that the sedimentation performance of the metal-based water purifying agent in sewage treatment is improved, and the stability of the metal-based water purifying agent is also improved.

Inventors

  • HU XIAO
  • HU XING
  • HU CHENG
  • Dong Lamei
  • YANG JIUHUA

Assignees

  • 无锡市必盛水处理剂有限公司

Dates

Publication Date
20260512
Application Date
20250820

Claims (6)

  1. 1. The preparation method of the metal-based water purifying agent for sewage treatment is characterized by comprising the following steps of: S1, placing coal gasification fine slag and hydrochloric acid aqueous solution into a reaction kettle for stirring, heating the reaction kettle to 70-80 ℃, reacting for 1-2h under the condition of heat preservation, and performing post treatment to obtain filtrate; S2, placing the filtrate, potassium permanganate and polyacrylamide into a reaction kettle, and adding a sodium hydroxide aqueous solution to adjust the pH value to be 2.5+/-0.3, so as to obtain a mixed solution; S3, placing the mixed solution and the modified sludge-based carbon into a reaction kettle, stirring, heating to 45-55 ℃, and standing for 2-4 hours to obtain a metal-based water purifying agent; The modified sludge-based carbon is prepared by the following steps: a1, placing pretreated sludge micro powder, calcium carbonate and deionized water into a reaction kettle, stirring, heating the reaction kettle to 75-85 ℃, reacting for 6-8 hours at a temperature, and performing post-treatment to obtain a modified sludge base carbon crude product; A2, uniformly mixing the modified sludge-based carbon crude product and nano ferroferric oxide particles, and calcining to obtain modified sludge-based carbon; The pretreatment sludge is prepared by the following steps: b1, crushing the sludge blocks, and sieving to obtain sludge micro powder; b2, carrying out microwave activation treatment on the bamboo scraps to obtain activated bamboo scraps; b3, placing the sludge micro powder, the activated bamboo chips and the zinc chloride solution into a reaction kettle for stirring, standing at room temperature for 20-24 hours, and performing post-treatment to obtain pretreated sludge; The preparation method of the activated bamboo chips comprises adding bamboo chips into a microwave generator with power set at 400-600W, and treating for 3-5min to obtain activated bamboo chips.
  2. 2. The method for preparing the metal-based water purifying agent for sewage treatment according to claim 1, wherein in the step S1, the dosage ratio of coal gasification fine slag to hydrochloric acid aqueous solution is 5-10 g/80-100 mL, the concentration of the hydrochloric acid aqueous solution is 1-3mol/L, in the step S2, the dosage ratio of filtrate, potassium permanganate and polyacrylamide is 40-60 mL/0.1-0.2 g/0.2-0.4 g, the concentration of sodium hydroxide aqueous solution is 2-10wt%, and in the step S3, the dosage ratio of the mixed solution to modified sludge-based carbon is 60-80 mL/2-4 g.
  3. 3. The preparation method of the metal-based water purifying agent for sewage treatment according to claim 1, wherein in the step A1, the dosage ratio of the pretreated sludge micro powder to the calcium carbonate to the deionized water is 4-6g:4-6g:50-70mL, and in the step A2, the weight ratio of the modified sludge-based carbon crude product to the nano ferroferric oxide particles is 4-6:0.5-1.
  4. 4. The preparation method of the metal-based water purifying agent for sewage treatment according to claim 1, wherein in the step A2, the preparation method of the modified sludge-based carbon is characterized in that a crude product of the modified sludge-based carbon and nano ferroferric oxide particles are uniformly mixed and then added into a tubular furnace, the temperature is raised to 550-650 ℃ at a rate of 5 ℃ per minute, the heat preservation reaction is carried out for 0.5-1h, the temperature is raised to 850-950 ℃ at a rate of 10 ℃ per minute, the heat preservation reaction is carried out for 0.5-1h, after the product is cooled to room temperature, the product is washed by deionized water for 2-4 times, the product is transferred into an oven with the temperature of 70-80 ℃, the product is dried to constant weight, and the product is sieved by a 300-mesh sieve, so that the modified sludge-based carbon is obtained.
  5. 5. The method for preparing a metal-based water purifying agent for sewage treatment according to claim 1, wherein in the step B3, the sludge micro powder, the activated bamboo chips and the zinc chloride solution are used in an amount ratio of 5-7g to 1-3g to 10-15mL, and the concentration of the zinc chloride solution is 30-40wt%.
  6. 6. A metal-based water purifying agent for sewage treatment, which is prepared by the method for preparing a metal-based water purifying agent for sewage treatment according to any one of claims 1 to 5.

Description

Metal-based water purifying agent for sewage treatment and preparation method thereof Technical Field The invention relates to the technical field of water purifying agent processing, in particular to a metal-based water purifying agent for sewage treatment and a preparation method thereof. Background Along with the acceleration of industrialization and town process, pollutants such as heavy metal ions, organic dyes, phosphorus fluorides and the like which are difficult to degrade commonly exist in sewage, and the traditional treatment method is difficult to meet the requirements of high efficiency, low consumption and resource utilization. The metal-based water purifying agent has strong flocculation property, high adsorptivity and adjustable structural stability, and is widely focused in the field of sewage purification, and currently, a plurality of metal-based water purifying agents mainly comprise inorganic polymeric flocculants based on polyvalent metal ions such as aluminum, iron, manganese and the like, such as polyaluminium chloride, polymeric ferric sulfate and composite derivatives thereof, and researchers generally adopt substances such as carbon materials, silicon materials, clay and the like for carrying out load modification or introduce functional groups such as carboxyl groups, amino groups, sulfonic groups and the like, nanocrystallization treatment and other technical means to realize effective complexation, sedimentation and separation between metal ions and pollutants. In the prior art, on one hand, the traditional aluminum-iron flocculant is easy to hydrolyze and unstably under the condition of acid-base fluctuation, and has limited treatment efficiency on low-concentration organic pollutants, on the other hand, the modification means often depend on physical doping or single functional group modification, the interface combination of metal colloid and matrix material is weak, the metal colloid is easy to separate and run off in water, high-selectivity adsorption in complex water is difficult to realize, in addition, the structure of the adsorbent material lacks of multi-scale pore and directional functional group layout, so that the utilization rate of adsorption sites is low, the non-magnetic or weak-magnetic water purifying agent is difficult to realize effective recovery, and the industrial recycling of the non-magnetic or weak-magnetic water purifying agent is limited. Disclosure of Invention The invention aims to provide a metal-based water purifying agent for sewage treatment and a preparation method thereof, which are used for solving the technical problem that the sedimentation performance and stability of the water purifying agent in the prior art are required to be further improved. The invention aims at realizing the following technical scheme that the preparation method of the metal-based water purifying agent for sewage treatment comprises the following steps: S1, placing coal gasification fine slag and hydrochloric acid aqueous solution into a reaction kettle for stirring, heating the reaction kettle to 70-80 ℃, reacting for 1-2h under the condition of heat preservation, and performing post treatment to obtain filtrate; The preparation reaction principle of the filtrate is as follows: In the reaction process, al 2O3、Fe3O4 and Fe 2O3 contained in coal gasification fine slag are converted into trivalent aluminum ions, divalent iron ions and trivalent iron ions under the action of a hydrochloric acid aqueous solution, the trivalent aluminum ions, the divalent iron ions and the trivalent iron ions are dissolved in the hydrochloric acid aqueous solution, insoluble impurities are removed through filtration, and filtrate containing the trivalent aluminum ions, the divalent iron ions and the trivalent iron ions is obtained. S2, placing the filtrate, potassium permanganate and polyacrylamide into a reaction kettle, and adding a sodium hydroxide aqueous solution to adjust the pH value to be 2.5+/-0.3, so as to obtain a mixed solution; the preparation reaction principle of the mixed solution is as follows: In the reaction process, ferrous ions in the filtrate are oxidized into ferric ions by potassium permanganate, the molecular chain of polyacrylamide contains polar groups such as-CONH, -NH and the like, the complexing and coordination capacity is good, the complexing and coordination capacity can be realized, a complex can be formed by electron pairs with metal ions such as Fe 3+、Al3+ and the like, the pH value of a filtrate system is regulated by a sodium hydroxide aqueous solution, the polymerization can be promoted, and meanwhile, the generation of Fe (OH) 3 precipitation is avoided, so that the mixed solution is obtained. And S3, placing the mixed solution and the modified sludge-based carbon into a reaction kettle, stirring, heating to 45-55 ℃, and standing for 2-4 hours to obtain the metal-based water purifying agent. The preparation reaction principle of the metal-based wa