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A method for preparing glass-ceramics using sewage sludge from waterworks

A wastewater sludge and waterworks technology, which is applied in the field of waterworks wastewater sludge turning waste into treasure, achieves the effects of simple process, low raw material cost and stable toxicity

Inactive Publication Date: 2014-10-22
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on making porcelain or glass-ceramics from sludge is rarely reported in China.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The waste water sludge from the waterworks is mixed with 90% feldspar, calcium oxide and alumina powder in proportion of 10% by weight. Wastewater sludge was heated in a constant temperature box at 120°C for 36 hours before drying. The above mixture is ground evenly and passed through a 100-mesh sieve. Then ball milled for 24 hours.

[0015] The above mixture was put into an alumina crucible and melted in an electric resistance furnace at 1400° C. and kept for 3 hours. Then water quenching, grinding and passing through a 100-mesh sieve.

[0016] The above glass frit was compression molded. Then move it into a resistance furnace, sinter at 900°C and keep it warm for 3.5 hours to crystallize to obtain glass ceramics.

[0017] The glass-ceramic has a strength of 139MPa.

Embodiment 2

[0019] The wastewater sludge from the waterworks is mixed with 85% feldspar, calcium oxide and alumina powder in proportion of 15% by weight. Wastewater sludge was heated in a constant temperature box at 120°C for 36 hours before drying. The above mixture is ground evenly and passed through a 100-mesh sieve. Then ball milled for 24 hours.

[0020] The above mixture was put into an alumina crucible and melted in a resistance furnace at 1450° C. and kept for 2.5 hours. Then water quenching, grinding and passing through a 100-mesh sieve.

[0021] The above glass frit was compression molded. Then move it into a resistance furnace for sintering at 900°C and keep it warm for 3 hours to crystallize to obtain glass ceramics.

[0022] The glass-ceramic strength is 105MPa.

Embodiment 3

[0024] A method for preparing glass ceramics using sewage sludge from waterworks, the steps of which are as follows:

[0025] (1) Heat the wastewater sludge from the waterworks in a constant temperature box at 110°C for 24 hours, grind the dried wastewater sludge with feldspar, alumina, and calcium oxide, and pass through an 80-mesh sieve after grinding , mix uniformly, the weight of described wastewater sludge accounts for 10% of the total weight of wastewater sludge, feldspar, alumina, calcium oxide, and the total weight of feldspar, alumina, calcium oxide accounts for the total weight of wastewater sludge, feldspar, oxide 90% of the total weight of aluminum and calcium oxide, the weight ratio of the feldspar, aluminum oxide and calcium oxide is 65:1:26 to obtain the mixture;

[0026] (2) Put the mixture into a resistance furnace, keep it warm at 1400 °C for 2 hours, melt it and quench it in water, and pass it through an 80-mesh sieve after grinding to obtain glass frit;

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Abstract

The invention discloses a method for preparing a glass ceramic by utilizing wastewater sludge from water works, wherein the method comprises the following steps: (1) grinding the dried wastewater sludge from water works and feldspar, aluminium oxide and calcium oxide, mixing the raw materials evenly, wherein the weight of the wastewater sludge is 10-30% of the total weight of the wastewater sludge, the feldspar, the aluminium oxide and the calcium oxide, thereby obtaining a mixed material; (2) feeding the mixed material into a resistance furnace, keeping temperature for 2 -3 hours at a temperature of 1400-1500 DEG C, melting and water quenching the mixed material, after grinding, sieving the mixed material via a sieve with 80 -120 meshes to obtain a glass material; and (3) performing compression moulding on the glass material, and sintering the glass material for 3 -4 hours at a temperature of 600 -1000 DEG C to obtain the glass ceramic. The method provided by the invention has simple process and low raw material cost; the method provided by the invention can obtain the glass ceramic material with strength of 100 -200 MPa; the method provided by the invention is suitable for industrial scale. The method provided by the invention can be applied to the fields such as mechanical manufacture, chemistry, industry and construction.

Description

technical field [0001] The invention relates to the technical field of turning waste water sludge from waterworks into treasure and solving environmental pollution caused by sludge. Background technique [0002] In recent years, due to the intensive growth of population, accelerated industrialization and urbanization, a large amount of waste and by-products such as sludge, coal ash and mud have been generated, and the treatment of wastewater sludge has become a growing economic and environmental burden. . The traditional sludge treatment method is generally first treatment and then disposal, that is, concentration, conditioning, dehydration, drying and other treatments first, and then sanitary landfill, land use and incineration. However, these methods all have the risk of environmental pollution, and the economic benefits are also very low. Now there are many emerging sludge treatment technologies have been developed, such as sludge oil, melting, ceramics, activated carbo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/00C03C6/00
Inventor 张小立
Owner ZHONGYUAN ENGINEERING COLLEGE