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Fly ash unburned ceremsite and preparation method as well as application thereof

A technology of fly ash and ceramsite, applied in ceramic products, other household appliances, chemical instruments and methods, etc., can solve the problems of low removal efficiency of heavy metal ions, consumption of heavy metal sludge of large alkaline chemicals, etc., and achieve excellent heavy metal ions. The effect of adsorption performance, convenient operation and simple preparation method

Active Publication Date: 2013-10-23
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment process not only consumes a large amount of alkaline chemicals and produces a large amount of heavy metal sludge, but also has a low removal efficiency for heavy metal ions, which can only meet the requirements of pretreatment

Method used

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  • Fly ash unburned ceremsite and preparation method as well as application thereof
  • Fly ash unburned ceremsite and preparation method as well as application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Raw material pretreatment: After drying the raw material, pass through a 60-mesh sieve;

[0035] 2) Mixing of raw materials: Mix the raw materials evenly according to the following weight ratio: 80 kg of fly ash, 8 kg of cement, and 2 kg of sodium sulfide;

[0036] 2) Granulation: add 20 kg of an aqueous solution of sodium lauryl sulfate with a weight concentration of 0.2% to 100 kg of uniformly mixed raw materials. Granules;

[0037] 3) Curing: Curing the ceramsite blank under natural conditions for 2 hours;

[0038] 4) Steam curing: Steam the cured ceramsite embryos for 6-12 hours under high-temperature steam conditions of 100-180°C;

[0039] The prepared fly ash unfired ceramsite has a good overall shape, well-developed pores and interconnected internal pores. Density 1.35g / cm 3 , bulk density 875kg / m 3 , the strength reaches 5MPa, and the specific surface area is 12m 2 / g.

Embodiment 2

[0041] 1) Raw material pretreatment: After drying the raw material, pass through a 100-mesh sieve;

[0042] 2) Mixing of raw materials: Mix the raw materials evenly according to the following proportions by weight: 40 kg of fly ash, 10 kg of cement, and a mixture of potassium sulfide and calcium sulfide with a weight ratio of 1:1 totals 1 kg;

[0043] 2), granulation: add 30 kg of cetyltrimethylammonium chloride aqueous solution with a weight concentration of 0.5% to 100 kg of uniformly mixed raw materials, the amount of aqueous solution added is 30% of the raw material, stirring and granulating become 10mm ceramsite blank;

[0044] 3) Curing: Curing the ceramsite blank for 4 hours under natural conditions;

[0045] 4) Steam curing: Steam the cured ceramsite embryos for 10 hours under high-temperature steam conditions of 160°C. Example 3

Embodiment 3

[0046] 1) Raw material pretreatment: After drying the raw material, pass it through a 80-mesh sieve;

[0047] 2) Mixing of raw materials: Mix the raw materials evenly according to the following proportions by weight: 60 kg of fly ash, 15 kg of cement, sodium sulfide, potassium sulfide, calcium sulfide, magnesium sulfide, iron sulfide, ferrous sulfide by weight, (the weight ratio of each sulfide is 1:1:1:1:1) a total of 5 kg;

[0048] 2) Granulation: Add 40 kg of an aqueous solution of 0.8% alkylphenol polyoxyethylene ether to 100 kg of uniformly mixed raw materials. The amount of aqueous solution added is 40% of the raw material. Stir and granulate to form a 10mm pottery Granules;

[0049] 3) Curing: Curing the ceramsite blank for 3 hours under natural conditions;

[0050] 4) Steam curing: Steam the cured ceramsite blank for 8 hours under high-temperature steam conditions of 150°C.

[0051] The use of fly ash unburned ceramsite is mainly used as an adsorption carrier for heav...

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Abstract

The invention discloses fly ash unburned ceremsite and a preparation method as well as application thereof. The unburned ceremsite comprises fly ash, cement and a metal sulfide raw material, wherein the unburned ceremsite is spherical particles of 5-20 mm with density of 1.35 g / cm<3>, stacking density of 875 kg / m<3>, strength reaching 5 MPa, specific surface area of 12 m<2> / g, perfect integral form, rich pores and communicated internal pores. The fly ash unburned ceremsite has the advantages of simple preparation method and equipment structure, convenience in operation, superior heavy metal ion adsorption performance and capability of achieving higher removal efficiency of 99 percent under the conditions of higher loads of Hg<2+>, Cu<2+>, Zn<2+>, Pb<2+>, Cd<2+>, Cr<6+> and the like in wastewater, effluent water meets the national standard category III on surface water, and high adsorption capacity reaching 25-30 mg / g to heavy metals is achieved. The unburned ceremsite is used as an absorptive carrier for heavy metal wastewater treatment.

Description

technical field [0001] The invention relates to the treatment of heavy metal wastewater, in particular to a fly ash non-fired ceramsite, a preparation method and an application thereof. Background technique [0002] Coal-fired power generation has a long history and is an important form of power generation. For a relatively long period of time in the future, coal-fired power generation will continue to be the main power source in my country. Therefore, the output of fly ash, a product of coal-fired power generation, will continue to increase. In 2010, my country's fly ash emissions will reach 200 million tons, and its floor area will reach more than 1.334 million square meters. [0003] Fly ash is mainly composed of silicon, aluminum, iron, calcium, magnesium, sulfur, potassium, sodium and other elements. In addition, it also contains a certain amount of cadmium, arsenic, chromium, lead, mercury, copper, zinc, nickel, etc., which are harmful to human health. Harmful trace...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/10C04B28/00B01J20/10B01J20/30C02F1/28C02F1/62C04B18/08C04B22/14
CPCY02W30/91
Inventor 刘阳生邹正禹
Owner PEKING UNIV
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