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Compound coagulant made from fly ash and preparation method and application thereof

A technology of fly ash and coagulant, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems that have not been reported in the literature, and achieve the effects of low cost, shortened time and reduced cost

Inactive Publication Date: 2009-09-09
SHANGHAI INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For utilizing fly ash of the present invention to produce inorganic composite coagulant, do not see bibliographical information yet at present

Method used

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  • Compound coagulant made from fly ash and preparation method and application thereof
  • Compound coagulant made from fly ash and preparation method and application thereof
  • Compound coagulant made from fly ash and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1), Roasting:

[0029] The fly ash from the power plant of Panzhihua Iron and Steel Company was used as the raw material, and its chemical composition is shown in Table 1.

[0030] Chemical composition / wt% of raw material fly ash of table 1

[0031]

[0032] Soda powder and fly ash with a mass content of 55% were evenly mixed, and 300 g of the mixture was placed in a SX2-10-13 high-temperature muffle furnace for roasting. Raise the temperature from room temperature to 850°C at a constant rate of 10°C / min, and keep the temperature for 30min at this calcination temperature.

[0033] (2), activation

[0034] After cooling in the furnace, crush it with a jaw crusher, and then mechanically activate it with an ND2-1L planetary ball mill. The rotation speed of the ball mill is 220rpm, the ratio of material to ball is 1:3, and the mechanical activation time is 2.5h.

[0035] After sieving, take the part with a particle size below 0.074mm as the leaching raw material for ...

Embodiment 2

[0043] (1), Roasting:

[0044] The fly ash from the power plant of Panzhihua Iron and Steel Company is used as raw material, and its chemical composition is shown in Table 1 in Example 1. Soda powder and fly ash with a mass content of 55% were evenly mixed, and 300 g of the mixture was placed in a SX2-10-13 high-temperature muffle furnace for roasting. Raise the temperature from room temperature to 850°C at a constant rate of 10°C / min, and keep the temperature for 30min at this calcination temperature.

[0045] (2), activation

[0046] After cooling in the furnace, crush it with a jaw crusher, and then mechanically activate it with an ND2-1L planetary ball mill. The rotation speed of the ball mill is 220rpm, the ratio of material to ball is 1:3, and the mechanical activation time is 2.5h.

[0047] After sieving, take the part with a particle size below 0.074mm as the leaching raw material for the next two steps.

[0048] (3), pickling

[0049] The leaching is carried out i...

Embodiment 3

[0055] (1), Roasting:

[0056] The fly ash from the power plant of Panzhihua Iron and Steel Company is used as raw material, and its chemical composition is shown in Table 1 in Example 1.

[0057] Soda powder and fly ash with a mass content of 55% were evenly mixed, and 300 g of the mixture was placed in a SX2-10-13 high-temperature muffle furnace for roasting. Raise the temperature from room temperature to 850°C at a constant rate of 10°C / min, and keep the temperature for 30min at this calcination temperature.

[0058] (2), activation

[0059] After cooling in the furnace, crush it with a jaw crusher, and then mechanically activate it with an ND2-1L planetary ball mill. The speed of the ball mill is 220rpm, the ratio of material to ball is 1:3, and the mechanical activation time is 2.5h.

[0060] After sieving, take the part with a particle size below 0.074mm as the leaching raw material for the next two steps.

[0061] (3), pickling

[0062] The leaching is carried out i...

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Abstract

The invention relates to a compound coagulant made from fly ash and a preparation method and an application thereof. Steps of calcination, activation, acid dipping, alkali dipping, neutralization and copolymerization are used on the fly ash to produce the compound coagulant, that is, an inorganic compound coagulant ingredient of which is polysilicate aluminum ferric sulfate. The compound coagulant makes full use of valuable elements in the fly ash, and has the advantages of simple preparation process, low cost and obvious coagulation effect. No acid wastewater, alkali wastewater or solid waste is discharged, so the preparation method belongs to an advanced environment-friendly clean production process. The obtained compound coagulant is applicable to treatment of urban domestic sewage and industrial wastewater, has strong ability of turbidity removal, color removal and COD removal, and has the advantages of rapid floc forming speed, big and dense floc, rapid sedimentation speed, small sedimented sludge, low treatment cost and the like.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of fly ash, in particular to a composite coagulant produced with fly ash and its preparation method and application Background technique [0002] Coagulants are divided into two categories: inorganic coagulants and organic coagulants. There are many varieties, and their development trend is from low molecular weight to high molecular weight, from single type to compound type, and gradually develops in the direction of cheap, practical, non-toxic and high-efficiency. . Polysilicate inorganic polymer composite coagulant is a new type of high-efficiency water treatment agent developed on the basis of activated silicic acid and traditional aluminum salts, iron salts and other coagulants. , aggregation, adsorption and bridging performance, as well as the large flocs of aluminum salt coagulant, good decolorization performance, dense flocs of iron salt coagulant, fast settling speed, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 刘晓荣梁金奎廖代华王晶何绍刚金鸣林房永征陈麒忠
Owner SHANGHAI INST OF TECH
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