High-strength ceramsite containing sludge ash and preparation method thereof

A technology of sludge ash and high-strength ceramsite, which is applied in the field of artificial light aggregates, can solve problems such as increased raw material costs, adverse effects of ceramsite firing, and poor uniformity of raw materials, so as to improve bulk density, reduce difficulty, and increase The effect of cylinder crush strength

Inactive Publication Date: 2020-08-11
TIANJIN CEMENT IND DESIGN & RES INST
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Problems solved by technology

[0008] The requirements for high-strength ceramsite in the GB / T17431.1-2010 standard are: strength label ≧ 25MPa, water absorption ≦ 10%, 700Kg / m 3 ≦Density grade≦1200Kg / m 3 Cylinder compressive strength≧4MPa; Therefore, the ceramsite preparation method disclosed in the above-mentioned patent either has a cylinder compressive strength slightly higher than the standard, or the utilization rate of urban sludge is ≦55%, which limits its large-scale use; in addition, a variety of Auxiliary additives increase the cost of raw materials and make the uniformity of raw materials worse, thus adversely affecting the firing of ceramsite

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  • High-strength ceramsite containing sludge ash and preparation method thereof

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preparation example Construction

[0034] The present invention also discloses a method for preparing the above-mentioned high-strength ceramsite, which mainly includes the following steps:

[0035] S1, 10-90wt% sludge ash and 10-90wt% engineering spoil are crushed separately and mixed together;

[0036] S2. Grind the mixture in a small ball mill to 15%-30% of the 80 μm sieve, and use a disc granulator to make raw meal spheres. The particle size of the raw meal spheres is 5-20mm;

[0037] S3, drying the raw material spheres in an oven at 105° C. for 2 hours;

[0038] S4. Put the dried raw material spheres into the muffle furnace, raise the temperature from room temperature to 200°C, the heating time is 25-35min, and keep warm for 15-25min; -50min, keep warm for 15-30min; finally heat up from 600°C-700°C to 1080-1200°C, heat up for 55-75min, keep warm for 20-30min, then cool down to room temperature naturally.

[0039] Through this method, water absorption ≦10%, cylinder compressive strength 7.5-17.8MPa, bulk ...

Embodiment 1

[0042] S1, 90wt% of sludge ash, 10wt% of engineering spoils were crushed and mixed together;

[0043] S2. Grind the mixture in a small ball mill to 30% of the 80 μm sieve, and use a disc granulator to make raw meal spheres. The particle size of the raw meal spheres is 5-20 mm;

[0044] S3, drying the raw material spheres in an oven at 105° C. for 2 hours;

[0045] S4. Put the dried raw material spheres into a muffle furnace, heat up from room temperature to 200°C, heat up for 25 minutes, and keep warm for 15 minutes; then heat up from 200°C to 600°C, heat up for 40 minutes, and keep warm for 15 minutes; finally Raise the temperature from 600°C to 1080°C for 55 minutes, keep warm for 20 minutes, and cool to room temperature naturally.

[0046] After inspection, the characteristics of the ceramsite products obtained in the above scheme are: the bulk density is 763kg / m 3 , cylinder compressive strength 7.5MPa, 1h water absorption rate 9.63%; after high temperature calcination, ...

Embodiment 2

[0048] S1, 10wt% of sludge ash, 90wt% of engineering spoils were crushed and mixed together;

[0049] S2. Grind the mixture in a small ball mill to 20% of the 80 μm sieve, and use a disc granulator to make raw meal spheres. The particle size of the raw meal spheres is 5-20 mm;

[0050] S3, drying the raw material spheres in an oven at 105° C. for 2 hours;

[0051] S4. Put the dried raw material spheres into the muffle furnace, heat up from room temperature to 200°C, heat up for 25 minutes, and keep warm for 20 minutes; then heat up from 200°C to 700°C, heat up for 45 minutes, and keep warm for 20 minutes; finally Raise the temperature from 700°C to 1200°C for 65 minutes, keep warm for 25 minutes, and cool to room temperature naturally.

[0052] After inspection, the characteristics of the ceramsite products obtained in the above scheme are: the bulk density is 960kg / m 3 , cylinder compressive strength 14.6MPa, 1h water absorption rate 2.56%; after high temperature calcinatio...

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Abstract

The invention belongs to the technical field of artificial light aggregate, and particularly relates to high-strength ceramsite containing sludge ash and a preparation method of the high-strength ceramsite. The high-strength ceramsite is prepared from the following raw materials in percentage by weight: 10 to 90 percent of sludge ash and 10 to 90 percent of engineering spoil, the preparation method of the ceramsite comprises the following steps: S1, crushing the sludge ash and the engineering spoil according to a ratio, and mixing; S2, grinding an obtained mixture until the screen residue of 80 microns is 15-30%, and preparing raw material spheres with the size of 5-20mm by using a disc granulator; S3, drying the raw material spheres; S4, putting the dried raw material spheres into a muffle furnace, heating from room temperature to 200 DEG C, and keeping the temperature; raising the temperature from 200 DEG C to 600-700 DEG C and then keeping the temperature; and finally, increasing the temperature to 1080-1200 DEG C again, carrying out heat preservation for 20-30 min, and then carrying out natural cooling to the normal temperature. The method solves the problem that high-strengthceramsite cannot be prepared from municipal sludge in a large mixing amount due to high water content and high organic matter content.

Description

technical field [0001] The invention belongs to the technical field of artificial light aggregates, in particular to a high-strength ceramsite containing sludge ash and a preparation method thereof. Background technique [0002] Ceramsite is a lightweight aggregate produced by foaming in a rotary kiln. It has a spherical shape, a smooth and hard surface, and a honeycomb inside, which has the characteristics of low density, low thermal conductivity and high strength. In the refractory industry, ceramsite is mainly used as aggregate of heat insulation refractory materials. [0003] At present, the raw materials for the preparation of ceramsite are mainly clay or shale. Since clay is a precious natural resource, vigorous development of clay ceramsite will inevitably lead to the destruction and loss of a large amount of high-quality cultivated land; and the production of ceramsite from shale will destroy natural vegetation. and the environment, and to some extent break the bal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B33/132C04B33/135
CPCC04B33/132C04B33/1357C04B38/009C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96Y02P40/60
Inventor 韩辉张明飞陈昌华
Owner TIANJIN CEMENT IND DESIGN & RES INST
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