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Lightweight aggregate prepared from steel mill sludge, and preparation method thereof

A lightweight aggregate and steel mill technology, applied in applications, household utensils, clay products, etc., can solve problems such as non-compliance with requirements, and achieve low water absorption, low density, and good thermal insulation

Pending Publication Date: 2019-09-13
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the patent CN100584794C discloses a method for preparing ceramsite lightweight aggregate from sludge, the method is applied to making steel sludge into lightweight aggregate, and the cylinder compressive strength of the resulting lightweight aggregate is less than 6.0. Does not meet the requirements of GB / T17431.2-1998

Method used

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  • Lightweight aggregate prepared from steel mill sludge, and preparation method thereof
  • Lightweight aggregate prepared from steel mill sludge, and preparation method thereof
  • Lightweight aggregate prepared from steel mill sludge, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing lightweight aggregate from pure high-calcium sludge, comprising the steps of:

[0038] a. Put the dewatered sludge with a moisture content of 47% into a drying box, dry it at 105°C for 24 hours, then pulverize and grind it into powder, and pass the obtained sludge powder through a 200-mesh sieve;

[0039] b. Take 3kg of sludge powder and pour it into the pelletizing machine, then spray water and feed alternately. After the pelletizing machine rotates 1760 times within 55 minutes, a raw pellet of 10-15mm is obtained, and the finished product volume is 1.1L;

[0040] c. Put the raw meal balls in a drying oven and dry them at 105°C for 1 hour;

[0041] d. Put the dried raw meal balls in a muffle furnace, raise the temperature to 300°C at a heating rate of 10°C / min, keep it at 300°C for 20 minutes, and raise it to 1100°C at a heating rate of 5°C / min, and keep it warm 25min;

[0042] e. The fired aggregate is cooled to room temperature with the furna...

Embodiment 2

[0045] A method for preparing lightweight aggregate by utilizing high-calcium sludge accounting for 80% and fly ash accounting for 20%, comprising the following steps:

[0046] 1. Put the dewatered sludge with a moisture content of 47% into a drying oven, dry it at 105°C for 24 hours, and then pulverize it to make powder, and pass the obtained sludge powder and fly ash through a 200-mesh sieve;

[0047] 2. Mix according to the ratio of sludge weight ratio of 80% and fly ash weight ratio of 20%;

[0048] 3. After mixing evenly, take 3kg of the mixture and pour it into the pelletizing machine, then spray water and feed alternately. The pelletizing machine rotates 2240 times within 70 minutes to get 10-15mm raw material balls, and the finished product volume is 1.8L;

[0049] 4. Put the raw meal balls in a drying oven and dry them at 105°C for 1 hour;

[0050] 5. Put the dried raw meal balls in a muffle furnace, raise the temperature to 300°C at a heating rate of 10°C / min, keep ...

Embodiment 3

[0054] A method for preparing lightweight aggregate by utilizing high-calcium sludge accounting for 60% and fly ash accounting for 40%, comprising the following steps:

[0055] 1. Put the dewatered sludge with a moisture content of 47% into a drying oven, dry it at 105°C for 24 hours, and then pulverize it to make powder, and pass the obtained sludge powder and fly ash through a 200-mesh sieve;

[0056] 2. Mix according to the ratio of sludge weight ratio of 20% and fly ash weight ratio of 80%;

[0057] 3. After mixing evenly, take 3kg of the mixed material and pour it into the pelletizing machine, then spray water and feed alternately. The pelletizing machine rotates 2464 times within 77 minutes to get 10-15mm raw material balls, and the finished product is 2.2L;

[0058] 4. Put the raw meal balls in a drying oven and dry them at 105°C for 1 hour;

[0059] 5. Put the dried raw meal balls in a muffle furnace, raise the temperature to 300°C at a heating rate of 10°C / min, keep ...

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Abstract

The invention discloses a lightweight aggregate. Steel mill sludge is used as a raw material to prepare the aggregate, the raw material formula of the aggregate comprises 10-40% of the steel mill sludge and 60-90% of fly ash. A specific preparation method of the aggregate comprises the following steps: the steel mill sludge is dried, crushed and ground, and sieved, the sieved fly ash is added according to a certain weight ratio, the sludge and the fly ash are uniformly mixed, the obtained mixture is pelletized, and obtained raw material pellets are dried for a certain time, then undergo heat treatment, and finally are sintered and cooled to obtain the finished aggregate. The lightweight aggregate obtained in the invention has the characteristics of high strength, low density, good heat insulation performance and low water absorption rate; and the sludge and fly ash are only used to obtain the lightweight aggregate with a certain heat insulation property, and the raw materials are solidwastes, so the preparation method has the advantages of realization of changing wastes into valuables, energy saving, environmental protection, and reduction the aggregate preparation cost.

Description

technical field [0001] The invention relates to the field of reutilization of metallurgical solid waste, in particular to a light aggregate prepared by using steel mill sludge and a preparation method thereof. Background technique [0002] With the rapid development of social science and technology, the improvement of social productivity has accelerated the development of modernization, and at the same time, it has also brought ecological and environmental problems. In particular, the large-scale exploitation of natural resources in the industrial field has not only caused the reduction of non-renewable resources, but also caused the accumulation of a large amount of solid waste, occupying limited land resources and even causing secondary pollution. Therefore, it is of great practical significance to rationally utilize solid waste according to its characteristics. [0003] Sludge from steel mills is a solid sediment treated by wastewater from steel mills and domestic sewage...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B33/135C04B33/132C04B18/02
CPCC04B18/027C04B33/1321C04B33/1352C04B38/0645C04B38/068C04B2235/77C04B2235/96C04B38/0067Y02P40/60
Inventor 耿淑华张玉文黄颖鲁雄刚董辉章超
Owner SHANGHAI UNIV
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