Low-carbon environment-friendly unfired ceramsite filter material as well as preparation method and application thereof

A ceramsite filter material, low-carbon and environmentally friendly technology, applied in the field of water treatment, can solve the problems of large plant construction investment, large water flow resistance, complex process technology, etc., achieve excellent comprehensive performance, avoid filter layer mud accumulation, accumulation of porosity high effect

Active Publication Date: 2022-03-01
JIANHUA CONSTR MATERIALS (CHINA) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of society, the scale of cities continues to expand, and the sewage treatment problems caused by domestic and industrial production become more and more severe. The existing natural filter materials include quartz sand, anthracite, activated carbon, zeolite, etc., which are expensive and irregular in shape. , there are problems such as large water flow resistance, easy to cause blockage of the filter, resulting in erosion and broken, difficult backwashing, etc.
Artificial ceramsite filter material is mainly prepared by calcination of natural materials such as clay or shale. It has the advantages of high sphericity, good filtration performance, and low cost. The problem of high energy consumption in production not only produces a large amount of carbon emissions, but also seriously restricts the development of enterprises, and the extensive use of clay will lead to the destruction of cultivated land, which is not conducive to the sustainable development of the country
[0003] The traditional preparation method of unfired ceramsite mainly relies on the hydration reaction of silicate materials such as cement, or the chemical excitation of aluminosilicate materials such as fly ash and mineral powder. Alkaline products such as calcium, calcium silicate hydrate or calcium aluminate hydrate gel do not have acid corrosion resistance and cannot meet the requirements of the hydrochloric acid dissolution rate index of artificial ceramsite filter materials, so there is no calcination-free process in the market Prepared ceramsite filter product
In the existing research on non-burning filter materials, the patent CN111018097A "a kind of ceramsite filter material suitable for biological aerated filter and its preparation method" adopts 300 ℃ high temperature steam curing to prepare filter material, and there is no hydrochloric acid in its preparation process. The acid-resistant technical means of the capacity index, the anti-acid erosion performance of the filter material needs to be evaluated; CN109503207A "A Preparation Method for Water Treatment Ceramsite Filter Material", which is prepared by adding graphene and TiO2 to the sludge and steaming at 400 ° C , using non-silicate material system, expensive and poor economic adaptability

Method used

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  • Low-carbon environment-friendly unfired ceramsite filter material as well as preparation method and application thereof
  • Low-carbon environment-friendly unfired ceramsite filter material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take by weighing 6% concentrated sulfuric acid of cement mass, add water to dilute according to 1:5 (wt%), mix and stir with cement to form acid excitation material; acid excitation material, quartz powder and expanded perlite are according to the mass ratio of 20:70:10 Mix and stir, then add water with 35% of the total mass of the matrix and stir into a slurry; add aluminum paste powder with a cement mass of 0.8% and stir evenly, then pour the slurry into a pellet machine and extrude and granulate into balls (particle diameter 8mm left and right); After molding, the particles are left standing at room temperature for 5-6 hours → 90°C atmospheric pressure steam curing (heating 2h, constant temperature 4h, cooling 1h) → 1MPa / 180°C high-pressure steam curing (heating 2.5h, constant temperature 3h, cooling 1h )→dry at 100°C and cool to room temperature. Detect the bulk density of the granules after cooling and place them in the disc granulator, and weigh 15kg / m based on th...

Embodiment 2

[0046]Weigh 8% of the total mass of mineral powder and metakaolin (aluminosilicate material) concentrated hydrochloric acid, dilute with water according to 2:5.5 (wt%), mix and stir with mineral powder and metakaolin (mass ratio 7:3) to form acid Exciting material; mixing acid stimulating material: finely ground sand: expanded perlite according to the mass ratio of 30:60:10, then adding water with 25% of the total mass of the matrix and stirring to form a slurry; mixing biological protein foaming agent with water Mix at a ratio of 1:20, add an appropriate amount of foam stabilizer, prepare foam with a physical foaming machine, then add 5% foam to the slurry and stir evenly, pour it into a pellet machine, extrude and granulate into balls (with a particle size of about 8mm) ); After forming, the particles are left to stand at room temperature for 5-6h→90°C atmospheric pressure steam curing (heating 2h, constant temperature 4h, cooling 1h)→1MPa / 180°C high-pressure steam curing (he...

Embodiment 3

[0049] Weigh the concentrated nitric acid of 6% of the total mass of cement, fly ash and zeolite powder, dilute with water according to 1:6 (wt%), mix and stir with cement, fly ash and zeolite powder (mass ratio 5:3:2) to form Acid excitation material; mix and stir acid excitation material: finely ground sand: expanded perlite according to the mass ratio of 30:50:20, then add 40% water of the total mass of the matrix and stir to form a slurry; add 1% bicarbonate of cement mass Sodium and stir evenly, then pour the slurry into the pellet machine and extrude into pellets (about 8mm in diameter); after forming, the pellets should be kept at room temperature for 5 to 6 hours→90°C for normal pressure steam curing (heating for 2 hours) , constant temperature for 4 hours, cooling for 1 hour) → 1MPa / 180°C high-pressure steam curing (heating for 2.5 hours, constant temperature for 3 hours, cooling for 1 hour) → drying at 100°C and cooling to room temperature. Detect the bulk density of...

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Abstract

The invention belongs to the technical field of water treatment, and discloses a low-carbon environment-friendly unfired ceramsite filter material as well as a preparation method and application thereof. The method comprises the following steps: firstly, diluting high-purity acid with water, and mixing and stirring with a silicate or aluminosilicate material to obtain an acid excitation material; then adding water, siliceous powder and expanded perlite into the acid excitation material, and uniformly mixing and stirring to prepare a matrix; the ceramsite filter material finished product is finally formed through foaming pore-forming, extrusion forming, normal-pressure steam curing, high-pressure steam curing and surface modification, and the filter material is excellent in comprehensive performance and has the advantages of being good in grain shape, good in acid resistance and high in hardness. According to the invention, the traditional calcining process at 1000 DEG C or above is not needed, the ceramsite filter material is prepared through a hydrothermal synthesis process at 90-200 DEG C, the production energy consumption is low, the resources are saved, the prepared ceramsite filter material is spherical, the accumulation porosity of the filter material is high, backwashing is facilitated, and the filter material is prevented from depositing mud.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for preparing a low-carbon, environment-friendly, burn-free ceramsite filter material. Background technique [0002] With the development of society, the scale of cities continues to expand, and the sewage treatment problems caused by domestic and industrial production become more and more severe. The existing natural filter materials include quartz sand, anthracite, activated carbon, zeolite, etc., which are expensive and irregular in shape. , There are problems such as large water flow resistance, easy to cause blockage of the filter, resulting in erosion and broken, difficult backwashing, etc. Artificial ceramsite filter material is mainly prepared by calcination of natural materials such as clay or shale. It has the advantages of high sphericity, good filtration performance, and low cost. The problem of high energy consumption in production not o...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B28/08C04B38/02C04B38/10C04B38/08C04B41/64C04B41/61B01D39/06C04B111/23
CPCC04B28/00C04B28/08C04B38/02C04B38/106C04B38/08C04B41/64C04B41/61C04B41/4543C04B41/4905B01D39/06C04B2111/23C04B22/141C04B14/06C04B14/185C04B22/04C04B38/0074C04B14/106C04B22/122C04B24/14C04B2103/48C04B18/08C04B14/047C04B22/085C04B22/106
Inventor 康小朋李斌斌
Owner JIANHUA CONSTR MATERIALS (CHINA) CO LTD
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