Spinel prepared from water plant sludge and preparation method thereof

A technology of spinel and dewatered sludge, which is applied in the field of sludge treatment, can solve the problems of high price and less iron-aluminum spinel, and achieve the effects of convenient operation, long service life and good thermal stability

Active Publication Date: 2019-03-19
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, iron-aluminum spinel exists very little in nature, and the iron-aluminum spinel used in foreign countries is produced by electric melting method, which is expensive. Therefore, it is necessary to seek a cheap iron-aluminum spinel synthetic material top priority

Method used

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  • Spinel prepared from water plant sludge and preparation method thereof
  • Spinel prepared from water plant sludge and preparation method thereof
  • Spinel prepared from water plant sludge and preparation method thereof

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Embodiment 1

[0028] The present invention aims to provide a method for preparing iron-aluminum spinel or magnesia-aluminum spinel using water plant sludge:

[0029] Process flow: dehydration and crushing, mixing of ingredients, forming and calcination.

[0030] The invention determines the requirements of water plant sludge ingredients, the optimal temperature and time for high-temperature roasting, and determines the phase composition of the new material.

[0031] (1) Preparation of sludge samples from water plants

[0032] The water plant sludge is taken from a large water treatment plant in Beijing. The treatment process of the water plant adopts the coagulation sedimentation sand filter and the activated carbon filter treatment process. The sedimentation tank muddy water, the sand filter and the activated carbon filter backwash water are filtered by pressure The press filter is reused, and the mud cake is the sludge of the water plant. Retrieve the dewatered sludge from the water treatment pl...

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Abstract

The invention relates to spinel prepared with waterworks sludge and a preparing method thereof, which is in the field of sludge treatment. The method comprises the steps of step I: dry the waterworks sludge through natural drying, grind, dry and cool the sludge for standby application and get the sludge material; step II: add Al2O3 or Fe2O3 powder in the sludge material so that the molar ratio of Al and Fe in waterworks sludge is 5:1- 2:1, the activated carbon, the mass of graphite and other allotropes of carbon in the waterworks sludge is 5-15% of sludge material, and get the sludge treatment material; step III: mix the sludge treatment material evenly and grind it to make the particle size larger than 100 mesh sieve, mold the sludge treatment material, and get complete the method after drying and sintering or electric smelting. The spinel produced in the method of the invention has the properties like high melting point coefficient, heat-conducting property, good heat stability and good anti-alkali corrosion, therefore, it may replace the existing magnesia chromite refractory as an environmentally friendly refractory material.

Description

Technical field [0001] The invention belongs to the field of sludge treatment, and specifically relates to a spinel prepared by using sludge from a water plant and a preparation method thereof. Background technique [0002] A large amount of sludge is produced in the production process of water supply plants. The annual output of dewatered sludge (with a moisture content of 70%) in urban water plants across the country is close to 26 million tons. Therefore, reasonable disposal of large amounts of sludge has become an urgent problem at home and abroad. Research on the recovery and utilization of aluminum from water plant sludge has been carried out abroad in the 1960s and 1970s. The acid solution method, alkali solution method and ion exchange extraction method were first used to extract aluminum from sludge. In recent years, new technologies such as membrane method, electrodialysis method and supercritical water oxidation method have also been tried to recycle aluminum in water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/443C04B35/44C04B35/66C04B35/64
CPCC04B35/44C04B35/443C04B35/64C04B35/66C04B2235/3272C04B2235/3418C04B2235/658C04B2235/9607C04B2235/9692
Inventor 仇付国王珂付昆明许俊挺卢超代一帆
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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