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Method for preparing ceramsite by utilizing chromium slag and coal ash

A technology of fly ash and chrome slag is applied in the field of solid hazardous waste reduction, harmless treatment and resource utilization, which can solve the problems of high curing cost, long sintering time and high sintering temperature, and achieves high sintering efficiency, Good curing effect and fast sintering speed

Inactive Publication Date: 2017-01-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sintering temperature used in this method is high, the sintering time is long, and the curing cost is high. The most important disadvantage is that the sintered body is not a usable material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing ceramsite by using chromium slag and fly ash, the ceramsite includes 20% of finely ground chromium slag, 78% of fly ash, 1% of ferric oxide and 1% of active carbon. First, dry and grind the chromium slag through a 200-mesh sieve to obtain powder; then compound the chromium slag powder and fly ash according to the above ratio, add the wave-absorbing component iron oxide and pore-forming agent activated carbon and mix evenly; Extrusion molding in the machine (pressure 15MPa, pressure holding time 5s) to obtain the billet; using microwave sintering (power 9KW), the billet was fired at 1100°C for 30min in a reducing atmosphere, and the ceramsite product was obtained after cooling.

[0020] The ceramsite prepared by this method has a large number of microscopic pores inside, and the apparent density is 1540Kg / m 3 , The water absorption rate is 20.3%, and the cylinder compressive strength is 4.2Mpa. According to "Solid Waste Leaching Toxic Leaching Met...

Embodiment 2

[0022] A method for preparing ceramsite by using chromium slag and fly ash, the ceramsite includes 25% of finely ground chromium slag, 73% of fly ash, 1% of ferric oxide and 1% of active carbon. First, dry and grind the chromium slag to obtain powder; then compound the chromium slag and fly ash according to the above ratio, add the wave-absorbing component iron oxide and pore-forming agent activated carbon and mix evenly; extrude the mixture in a powder tablet press (Pressure 15MPa, holding time 5s) to obtain the billet; using microwave sintering (power 9KW), the billet was fired at 1100°C for 30min in a reducing atmosphere, and the ceramsite product was obtained after cooling.

[0023] The ceramsite prepared by this method has a large number of microscopic pores inside, and the apparent density is 1640Kg / m 3 , The water absorption rate is 18.6%, and the cylinder compressive strength is 4.6Mpa. According to "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid...

Embodiment 3

[0025] A method for preparing ceramsite by using chromium slag and fly ash, the ceramsite includes 18% of finely ground chromium slag, 78% of fly ash, 2% of ferric oxide and 2% of active carbon in terms of weight fraction. First, dry and grind the chromium slag to obtain powder; then compound the chromium slag and fly ash according to the above ratio, add the wave-absorbing component iron oxide and pore-forming agent activated carbon and mix evenly; extrude the mixture in a powder tablet press (Pressure 15MPa, holding time 5s) to obtain the billet; using microwave sintering (power 9KW), the billet was fired at 1100°C for 30min in a reducing atmosphere, and the ceramsite product was obtained after cooling.

[0026] The ceramsite prepared by this method has a large number of microscopic pores inside, and the apparent density is 1480Kg / m 3 , The water absorption rate is 25.3%, and the cylinder compressive strength is 3.4Mpa. According to "Solid Waste Leaching Toxic Leaching Meth...

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Abstract

The invention discloses a method for preparing ceramsite by utilizing chromium slag and coal ash. The method comprises the following steps of: firstly drying and grinding the chromium slag to obtain powder, then compounding the chromium slag powder and the coal ash according to a certain proportion, adding a wave-absorbing component and a hole-forming agent to mix uniformly, and putting the mixture in a powder pressing machine for extrusion and formation to obtain a blank; finally, adopting a microwave sintering mode to sinter the blank for a period of time under the condition of high-temperature reducing atmosphere, and cooling to obtain a ceramsite product. The method disclosed by the invention realizes harmless and recycling treatment of the chromium slag and the coal ash, and the prepared ceramsite contains low chromium content and leaching, and conforms to the requirements of lightweight aggregates of buildings. The method also has the advantages of simple process, less energy consumption and good property of produced ceramsite and the like.

Description

technical field [0001] The invention belongs to the technical field of solid hazardous waste reduction, harmless treatment and resource utilization, and specifically relates to a method for preparing ceramsite by using chromium slag and fly ash. Background technique [0002] Chromium slag is a highly toxic solid waste discharged from chromium salt production plants and ferrochrome alloy plants during the production process. Usually, about 10 tons of chromium slag will be discharged for every 1 ton of metal chromium produced. At present, the annual discharge of chromium slag in my country is about 200,000 tons. A large amount of chromium slag is piled up, which will have a great impact on the environment and surrounding people. The main component of chromium slag is Al 2 o 3 , accounting for about 70-80wt% of the chromium slag content, wherein the chromium content accounts for about 10wt% of the chromium slag content. At present, the utilization of chromium slag is mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B33/138C04B33/135C04B33/13C04B33/32
CPCC04B33/131C04B33/1352C04B33/138C04B33/32C04B38/009C04B38/068C04B2235/3272C04B2235/422C04B2235/667C04B2235/96C04B38/0067Y02P40/60
Inventor 蹇守卫孙孟琪何桂海马保国郅真真余后梁吴世明
Owner WUHAN UNIV OF TECH
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