Sludge steel slag ultra light ceramsite and method for preparing same

A technology of ultra-light pottery and steel slag, applied in the field of environmental science, to achieve the effects of sustainable economic development, low water absorption, and large specific surface area

Inactive Publication Date: 2011-09-28

SHANDONG UNIV

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AI-Extracted Technical Summary

Problems solved by technology

[0005] At present, there is no public report on the use of urban sewage p...

Method used

[0046] The batching is sludge 20wt%, and the ultra-light sludge ceramsite produced by clay 80wt%. The sintering temperature is 1150°C, the bulk density is 357.3kg/m3, the particle density is 828kg/m3, the water absorption rate is 7.4wt%, and the expansion rate is 35%. Both comparative example 2 and embodiment ...

Abstract

The invention relates to a sludge steel slag ultra light ceramsite and a method for preparing the same. The ultra light ceramsite comprises the following raw material components by weight portion: 10 to 35 portions of dewatered sludge, 10 to 25 portions of revolving furnace steel slag, and 30 to 80 portions of clay. The method comprises the following steps that: the dewatered sludge, revolving furnace steel slag and clay which are dried and crushed are weighed up according to the proportion and mixed with water; and the mixture is stirred to prepare a raw meal ball, and the raw meal ball is dried at the normal temperature and then sintered in a resistance furnace. The method and the ceramsite have the advantages that: the process is simple; the prepared ceramsite is a spherical solid withdeep brown or black brown rough surface; the bulk density is 400 to 500 kg/m<3>, and the grain density is 760 to 925 kg/m<3>; the ceramsite can float in water; the water absorption rate is 4.0 to 6.0percent, and the expansion rate is 17 to 30 percent; moreover, the ceramsite also has the characteristics of light weight, high strength, small water absorption rate, big specific surface area, and the like.

Application Domain

Claywares

Technology Topic

SlagAbsorption rate +9

Image

Examples

Experimental program(3)
Comparison scheme(3)

Example Embodiment

[0031] Example 1.

[0032] (1) The dewatered sludge is dried, and the three raw materials are crushed after the steel slag and clay are dried and screened with a 100-mesh sieve (particle diameter ≤ 0.15mm);

[0033] (2) weigh 10wt%, 80wt%, 10wt% of sludge, clay and converter steel slag after drying and pulverizing respectively, mix well, add an appropriate amount of water and stir to be mushy, and then make raw pellets by conventional methods;

[0034] (3) place the raw balls at room temperature to dry for 15 hours;

[0035] (4) Put the raw pellets into a 350°C box-type resistance furnace again, with a preheating time of 20 minutes; quickly transfer to a 1100°C tubular resistance furnace for 8 minutes; naturally cool to room temperature to obtain ultra-light ceramsite.

[0036] The prepared ultra-light ceramsite is dark brown or bright black spherical solid with rough surface, and the bulk density is 421kg/m2 3 , the particle density is 760kg/m 3 , can float in water, the water absorption rate is 4.0wt%, and the expansion rate is 30%.

Example Embodiment

[0039] Example 2.

[0040] (1) the processing of three kinds of raw materials is with embodiment 1;

[0041] (2) weigh 20wt% of sludge after drying and pulverized, 65wt% of clay and 15wt% of converter steel slag and mix, stir evenly and then add water and stir until it is viscous, and make raw pellets by conventional methods;

[0042] (3) place the raw balls at room temperature to dry for 10 hours;

[0043] (4) Put the raw pellets into a 370°C box-type resistance furnace, and the preheating time is 15 minutes; quickly transfer to a 1080°C tubular resistance furnace for 10 minutes; and cool to room temperature naturally to obtain ultra-light ceramsite.

[0044] The prepared ultra-light ceramsite is dark brown or dark brown spherical solid with rough surface. Bulk density is 454kg/m 3 , the particle density is 886kg/m 3 , can float in water, the water absorption rate is 5.5wt%, and the expansion rate is 27%.

Example Embodiment

[0047] Example 3.

[0048] (1) The dewatered sludge is dried, and the three raw materials are crushed after the steel slag and clay are dried, and then sieved with a 100-mesh sieve, and the particle diameter is less than or equal to 0.15mm;

[0049] (2) respectively weigh 30wt% of sludge after drying and pulverized, 45wt% of clay and 25wt% of converter steel slag and mix, stir evenly and then add water and stir to viscous state, then make raw meal balls by conventional methods;

[0050] (3) place the raw balls at room temperature to dry for 20 hours;

[0051] (4) Put the raw pellets into a 380°C box-type resistance furnace, and the preheating time is 20 minutes; transfer to a 1050°C tubular resistance furnace for 15 minutes; and cool to room temperature naturally to obtain ultra-light ceramsite.

[0052] The prepared ultra-light ceramsite is dark brown or bright black spherical solid with rough surface, and the bulk density is 487kg/m 3 , the particle density is 925kg/m 3 , can float in water, the water absorption rate is 6.0wt%, and the expansion rate is 17%.

[0053] The surface and internal SEM structure of the prepared ultralight ceramsite are as follows: figure 1 and figure 2 shown. Dried raw pellets look like image 3 shown. Ultra-light ceramsite looks like Figure 4 As shown, the state comparison of ultra-light ceramsite and raw pellets in water for 1h is as follows: Figure 5 shown.

PUM

Property	Measurement	Unit
Bulk density	421.0	kg/m³
Density	760.0	kg/m³
Sintering temperature	1150.0	°C

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

high strength
Simple process

Sludge steel slag ultra light ceramsite and method for preparing same

A technology of ultra-light pottery and steel slag, applied in the field of environmental science, to achieve the effects of sustainable economic development, low water absorption, and large specific surface area

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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