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Zero-valent iron ceramsite and preparation method thereof

A technology of zero-valent iron and ceramsite, which is applied in the direction of adsorption water/sewage treatment, reduced water/sewage treatment, etc., can solve the problems of weak adsorption of ceramsite, instability of zero-valent iron, non-recyclable use, etc., and achieve density The effect of being small, maintaining stability, and maximizing utilization

Inactive Publication Date: 2015-08-26
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide and prepare a kind of zero-valent iron ceramsite to solve the existing problems of zero-valent iron instability, easy agglomeration, weak adsorption force of ceramsite, low porosity, and non-recyclable use, etc., and realize comprehensive utilization of solid waste , in order to achieve the purpose of treating waste with waste

Method used

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  • Zero-valent iron ceramsite and preparation method thereof
  • Zero-valent iron ceramsite and preparation method thereof
  • Zero-valent iron ceramsite and preparation method thereof

Examples

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Embodiment 1

[0039] The preparation method of zero-valent iron ceramsite comprises the following steps: (1) Preparation of ceramsite blank: Weigh 40 parts by weight of construction dregs, 10 parts of rice straw crushed straw and 10 parts of iron oxide and mix to obtain a mixture, press water and The weight ratio of the solid mixture is 1:0.3 and stirred evenly. Among them, the construction dregs are used as the bonding material, the straw is carbonized to form a porous structure, granulated into balls and then sintered, and it is easy to recycle after absorbing nitrogen and phosphorus; (2) Drying and sintering the blank : first air-dry the above-mentioned ceramsite blank, then heat it up, the heating rate is 2°C / min, and then sinter at 500°C for 30min; (3) Reduction of the sintered product: cool the above-mentioned sintered product to room temperature, preferably Cool naturally for 24 hours, and then reduce with 0.4mol / L sodium borohydride solution to obtain zero-valent iron ceramsite. The ...

Embodiment 2

[0041]The preparation method of zero-valent iron ceramsite comprises the following steps: (1) Preparation of ceramsite blank: Weigh 80 parts by weight of construction dregs, 30 parts of crushed rice straw and 30 parts of iron oxide and mix to obtain a mixture. The weight ratio of the solid mixture is 1:0.5 and stirred evenly; (2) Drying and sintering blank: first blow dry the above-mentioned ceramsite blank with nitrogen, then raise its temperature at a rate of 4°C / min, and then sinter at 800°C for 60min (3) Reduction of the sintered product: the above-mentioned sintered product is cooled to room temperature, preferably naturally cooled for 24 hours, and then reduced with 0.5mol / L sodium borohydride solution to obtain zero-valent iron ceramsite, the best reduction time is 4 hours , wherein, the construction dregs include attapulgite, kaolin, bentonite and red soil. The morphology of the obtained zero-valent iron ceramsite is as follows figure 2 As shown, the ceramsite has a ...

Embodiment 3

[0043] The preparation method of zero-valent iron ceramsite comprises the following steps: (1) preparation of ceramsite blank: take 60 parts by weight of construction dregs, 20 parts of crushed rice straw and 20 parts of iron oxide and mix to obtain a mixture, press water and The weight ratio of the solid mixture is 1:0.4 and stirred evenly; (2) Drying and sintering the billet: first put the above-mentioned ceramsite billet in an oven to dry, then heat it up at a rate of 3°C / min, and then heat it up at 650°C (3) Reduction of the sintered product: Cool the above sintered product to room temperature, and then reduce it with 0.8mol / L sodium borohydride solution to obtain zero-valent iron ceramsite. The optimal reduction time is 3 hours. The above crushed rice straws can be replaced by any one or more than two kinds of rapeseed, corn, wheat or bean straws. The morphology of the obtained zero-valent iron ceramsite is as follows image 3 As shown, there are uneven pores inside the ...

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Abstract

The invention discloses zero-valent iron ceramsite and a preparation method thereof. The zero-valent iron ceramsite is prepared from the following raw materials in parts by weight: 40-80 parts of construction waste, 10-30 parts of smashed crop straw and 10-30 parts of iron oxide through the three steps of preparation of ceramsite blank, drying and sintering of the blank and reduction of sintered products. The zero-valent iron ceramsite prepared through the preparation method provided by the invention is loose and porous in internal structure, large in specific area, moderate in intensity, low in density, high in stability, renewable and recyclable, can remove various poisonous and harmful water pollutants simultaneously, has a high nitrogen and phosphorus adsorption and removal ratio, is good in treatment effect, simple in preparation process and high in actual operability, few kinds of raw materials are required, sources are wide and the cost is economical and low.

Description

technical field [0001] The invention belongs to the technical field of environmental protection treatment, and in particular relates to a zero-valent iron ceramsite and a preparation method thereof. Background technique [0002] Zero-valent iron is rich in sources and is a cheap new material that can remove a variety of toxic and harmful pollutants at the same time. Using it to treat polluted water bodies is considered to be one of the most promising treatment technologies. Zero-valent iron itself also has defects, such as being easily oxidized, easily agglomerated, and unstable, resulting in a reduced reaction rate and short storage time, which are limited in practical applications. In addition, during use, nano-zero-valent iron cannot be well dispersed in water, and after being dispersed in water, it can adsorb pollutants, and it is easy to enter the organism together with pollutants to produce biological toxicity, which seriously endangers the ecosystem. [0003] In view...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00C02F1/28C02F1/70
Inventor 谢发之李海斌圣丹丹胡婷婷汪雪春谢志勇
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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