A preparation method of unfired ceramsite with Fenton-like reaction properties

A technology of Fenton reaction and ceramsite, applied in the field of technology and application, can solve the problems of heavy metal pollution, low utilization rate of hydrogen peroxide, inability to play a catalytic role, etc., and achieves great application and promotion value. The effect of easy solid-liquid separation and convenient recycling and reuse

Active Publication Date: 2022-04-12
ZHEJIANG WANLI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when ceramsite is maintained, it takes 25-28 days, and the preparation time is too long, which increases the economic cost.
In addition, the heavy metal leaching concentration of the non-fired ceramsite can only reach the standard limit of Class V in the "Surface Water Environmental Quality Standard", and the heavy metal pollution has not been well resolved
[0018] So far, Fenton technology research has developed from a single homogeneous Fenton to a heterogeneous Fenton, which forms a metal oxide form by solidifying metal ions, which overcomes to a certain extent that the traditional Fenton must be carried out in an acidic pH range and produces more A series of problems such as iron sludge, low utilization rate of hydrogen peroxide, and difficulty in solid-liquid separation, especially the defect that the catalytic effect cannot be performed when the actual wastewater is close to neutral pH value, increase the adjustment of wastewater pH value and subsequent processes processing costs, these bottlenecks are still unresolved

Method used

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  • A preparation method of unfired ceramsite with Fenton-like reaction properties
  • A preparation method of unfired ceramsite with Fenton-like reaction properties
  • A preparation method of unfired ceramsite with Fenton-like reaction properties

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Experimental program
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Effect test

Embodiment 1

[0044] The ratio of fly ash, sludge, cement, oyster shell, diatomite and sepiolite is 15:15:20:20:30:10, adding 5% sodium silicate binder and 1% Calcium oxide activator, mix homogeneously, obtain mixed raw material; Get mixed raw material 5kg, in small disc granulator, be that the ferrous sulfate solution of 10wt% is sprayed mixed raw material and it is humidified to it with concentration, treat that the size of ball reaches 10 Stop at ~15mm and discharge to produce spherical raw meal, and accurately measure the volume of ferrous sulfate solution used to facilitate subsequent calculation of H 2 o 2 The amount of solution used.

[0045] The spherical raw meal is placed in a steam curing box, first cured at a temperature of 30°C and a humidity of 85% for 6 hours, and then heated to 60°C and maintained at a humidity of 80% for 6 hours. Then move it into a constant temperature drying oven at 50°C to dry for 6 hours, and cool naturally to obtain an unfired ceramsite with Fenton-l...

Embodiment 2

[0048] The ratio of fly ash, sludge, cement, activated clay, attapulgite, and oyster shells is 20:20:30:10:30:20, and the aforementioned 4% starch binder and 2% calcium sulfate are added to stimulate agent, mix evenly to obtain the mixed raw material; take 5kg of the mixed raw material, in a small disc granulator, spray the mixed raw material with a concentration of 15wt% ferrous chloride solution to humidify it, until the size of the ball reaches 10-15mm stop and discharge material at any time to obtain spherical raw meal, and accurately measure the volume of ferrous sulfate solution used for the convenience of subsequent calculation of H 2 o 2 The amount of solution used.

[0049] The spherical raw meal is placed in a steam curing box, first cured at a temperature of 40°C and a humidity of 90% for 5 hours, and then heated to 70°C and maintained at a humidity of 85% for 5 hours. Then move it into a constant temperature drying oven at 60°C to dry for 4 hours, and cool natura...

Embodiment 3

[0052] The ratio of fly ash, sludge, cement, green zeolite, bentonite, and oyster shells is 30:10:25:15:20:30, adding 3% of the aforementioned mass of sodium silicate binder and 3% of calcium oxide to stimulate agent, mix evenly to obtain the mixed raw material; take 5kg of the mixed raw material, in a small disc granulator, spray the mixed raw material with a concentration of 20wt% ferrous sulfate solution to humidify it, and when the size of the ball reaches 10-15mm Stop the machine and discharge the material to prepare spherical raw meal, and accurately measure the volume of the ferrous sulfate solution used for the convenience of subsequent calculation of H 2 o 2 The amount of solution used.

[0053] The spherical raw meal is placed in a steam curing box, first cured at a temperature of 45°C and a humidity of 95% for 4 hours, and then heated to 80°C and maintained at a humidity of 90% for 4 hours. Then move it into a constant temperature drying oven at 60°C to dry for 3 ...

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Abstract

The invention belongs to the technical fields of environmental functional materials, waste resource utilization, sewage and wastewater treatment, etc., and discloses a preparation method of non-fired ceramsite with Fenton-like reaction properties. Specifically, it uses fly ash, sewage treatment plant Sludge, oyster shells, cement, appropriate amount of mineral materials and additives are used as raw materials, and then an appropriate amount of Fe 2+ The solution is sprayed and the aforementioned raw materials are mixed uniformly and then granulated, then cured in a curing box to form and dried. The invention has many advantages, including easy solid-liquid separation after use, and convenient recycling and reuse; non-fired ceramsite has a large specific surface area, and has both adsorption, decolorization and oxidation functions; waste treatment with waste, low cost, light weight and high strength , to overcome the shortcomings of traditional Fenton-like materials that need to be used under acidic and heating conditions; stable properties, unbreakable structure, easy to use, no secondary pollution, and easy to recycle and reuse. It is not only a good Fenton-like catalyst material, but also an excellent carrier for bio-hanging film after use.

Description

technical field [0001] The invention belongs to the technical and application fields of environmental functional materials, waste resource utilization, sewage (waste) water treatment, etc., and specifically relates to a preparation method of non-fired ceramsite with Fenton-like reaction properties. Background technique [0002] Fenton's method is to use H 2 o 2 and Fe 2+ or Fe 3+ The chain reaction between them catalyzes the generation of strong oxidizing OH free radicals, and oxidizes and degrades most organic pollutants. The Fenton-like technology is a derivative of Fenton technology and belongs to the field of advanced oxidation technology. Compared with the traditional Fenton reaction, the Fenton-like technology reduces the operating cost of the traditional Fenton reaction and expands the application field of the traditional Fenton reaction, but it has high processing costs, narrow pH range, and polluted after treatment (waste ) Problems such as water color reversion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/26C04B28/02C04B40/02B01J23/835B01J27/055B01J35/10
CPCC04B28/26C04B28/02B01J23/835B01J27/055B01J35/1004C04B2201/20C04B2111/0081C04B18/08C04B18/0418C04B7/00C04B14/28C04B14/08C04B14/042C04B22/064C04B22/149C04B40/024C04B14/10C04B14/102C04B24/38C04B22/143C04B22/12C04B14/047C04B14/104
Inventor 王趁义汤唯唯王凤玲
Owner ZHEJIANG WANLI UNIV
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