Method for producing highly-effective compound polysilicate aluminum and ferric flocculant by coal ash and kaolinite

A polyaluminum silicate, kaolin technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of large proportion of iron salt flocs, limited application scope, occupation of land resources, etc., to achieve superior water purification effect, product The effect of high added value and low investment

Inactive Publication Date: 2009-09-23
陈兆东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PFS has a good effect in treating fluorine-containing wastewater, high-fluorine drinking water, and heavy metal-containing wastewater. Compared with aluminum salts, iron salt flocs have a larger specificity and less sediment volume, but due to the color of iron salts, it Applications are limited
[0004] At present, the annual discharge of fly ash from coal-fired power plants in my country has reached more than 100 million tons, while its utilization rate is only about 30%. A large amount of fly ash is accumulated in the ash yard, which not only occupies a large amount of land resources, but also seriously pollutes the environment

Method used

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  • Method for producing highly-effective compound polysilicate aluminum and ferric flocculant by coal ash and kaolinite
  • Method for producing highly-effective compound polysilicate aluminum and ferric flocculant by coal ash and kaolinite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Mix 500 kilograms of fly ash, 500 kilograms of kaolin and 20 kilograms of quicklime, feed into the reactor, add water to keep the liquid-solid volume ratio at 1:1, stir and soak, and heat at 100°C for 6 hours Finally, after cooling, carry out residue-liquid separation, and adjust the pH of the filtrate to about 9 for preservation; wash the filter residue, and the residue washing water can be recycled for secondary use, and then the filter residue is mixed with 36.7% industrial hydrochloric acid to keep the liquid-solid volume ratio at 1:1. Stir and soak in a reaction kettle, heat at 80°C for 5 hours, and separate residue from liquid after cooling to obtain a filtrate. Mix the two filtrates 1:1, stir, adjust the pH value to about 4, and let it stand still to obtain the brown-red high-efficiency composite polyaluminum iron silicate (PAFSC) flocculant liquid of the present invention.

Embodiment 2

[0032]Example 2: Mix 500 kilograms of fly ash, 1000 kilograms of kaolin, and 40 kilograms of quicklime, feed into the reactor, add water to keep the liquid-solid volume ratio at 2:1, stir and soak, heat at 80°C for 7 hours, and cool Finally, separate the residue from the liquid, adjust the pH of the filtrate to about 8 and save it; wash the filter residue, and the water for washing the residue can be recycled for secondary use, and then mix the filter residue with 36.7% industrial hydrochloric acid to keep the liquid-solid volume ratio at 2:1, and stir in the reactor Soak, heat at 100°C for 7 hours, and separate residue from liquid after cooling to obtain filtrate. Mix the two filtrates 1:1, stir, adjust the pH value to about 4, and let it stand still to obtain the brown-red high-efficiency composite polyaluminum iron silicate (PAFSC) flocculant liquid of the present invention.

Embodiment 3

[0033] Example 3: Mix 500 kilograms of fly ash, 250 kilograms of kaolin, and 30 kilograms of quicklime, feed into the reactor, add water to keep the liquid-solid volume ratio at 2:1, stir and soak, heat at 50°C for 8 hours, and cool Finally, separate the residue from the liquid, adjust the pH of the filtrate to about 9 and store it; wash the filter residue, and the water for washing the residue can be recycled for secondary use, and then mix the filter residue with 36.7% industrial hydrochloric acid to keep the liquid-solid volume ratio at 1.5:1, and stir in the reactor Soak, heat at 60°C for 8 hours, and separate residue from liquid after cooling to obtain filtrate. Mix the two filtrates 1:1, stir, adjust the pH value to about 4, and let it stand still to obtain the brown-red high-efficiency composite polyaluminum iron silicate (PAFSC) flocculant liquid of the present invention.

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Abstract

The invention discloses a method for producing high-efficiency composite polyaluminum-iron-silicate flocculants by using fly ash and kaolin. The method is to fully mix fly ash, kaolin, quicklime and water in a certain proportion and then set the temperature at 50-120 degrees centigrade. Heating at lower temperature for 4-8 hours, filtering after natural cooling, adjusting the pH value of the filtrate to 6-10 to obtain filtrate I; adding industrial hydrochloric acid with a concentration of 36.7% to the obtained filter residue and mixing, heating at a temperature of 50-120 degrees Celsius for 4 Filtrate after -8 hours of natural cooling to obtain filtrate II; Filtrate I and filtrate II are mixed at a volume ratio of 1: 1, stirred, adjusted to a pH value of 3 to 5, and left to stand to obtain the prepared liquid product of the present invention. Advantages of aluminum-based and iron-based flocculants, excellent stability and water purification effect, the treated water does not contain aluminum and other harmful components, which can effectively reduce the occurrence of Alzheimer's disease; and this method uses waste fly ash as raw material , low production cost, high product added value, and good economic, environmental and social benefits.

Description

1. Technical field: [0001] The invention relates to a production method of a polymer flocculant for water treatment, in particular to a method for producing a composite polyaluminum-iron silicate flocculant liquid by using fly ash and kaolin. 2. Background technology: [0002] With the rapid development of industrial and agricultural production and the improvement of people's living standards, water consumption and wastewater discharge are increasing. To make limited water resources meet people's growing production and living needs, effective purification treatment and recycling of discharged wastewater It is becoming more and more urgent, and various traditional water purifiers can no longer meet the requirements of water purification, environmental protection and health care. At present, the commonly used inorganic flocculants are aluminum-based and iron-based. Polyaluminum chloride (PAC) and polyferric sulfate (PFS) are typical representatives of aluminum-based and iron-b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52
Inventor 陈兆东孙莉莉陈继刚陈烨
Owner 陈兆东
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