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

A technology of polyaluminum iron silicate and kaolin, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of process equipment investment cost, high production operation cost, high waste water treatment cost, harsh preparation conditions, etc., and achieve clean water Excellent effect, fast precipitation, good product stability

Inactive Publication Date: 2008-05-21
陈兆东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since fly ash and polyaluminum iron silicate have similar elemental composition, relevant scientific research workers have explored the method of preparing polyaluminum iron silicate with fly ash as raw material, such as Chinese patent CN1266038C (named "polyaluminum iron silicate "Synthetic Method", Patent No.: 200410012422.7) discloses a synthetic method of polyaluminum iron silicate, which uses fly ash and ironmaking slag as the main raw materials, and the preparation process includes the preparation of polyaluminum iron, polymerization There are eight steps in the preparation of silicic acid and the preparation of polymerized aluminum iron silicate. This method has the following disadvantages: it uses more raw and auxiliary materials, including fly ash, ironmaking slag, sodium hydroxide , sodium carbonate, sulfuric acid and hydrochloric acid; and have special requirements for raw materials, Fe2O3 content of 40-50% ironmaking waste 20-40%, Fe2O3 content of 4%-10%, Al2O3 content of 20-30%, SiO: Content is the fly ash of 40-60%; Another example is disclosed in Chinese patent CN1325391C (name is " the method for producing polyaluminum-iron silicate composite flocculant with fly ash and ferrous sulfate ", and the patent number is: 200610054143.6) A production method of polyaluminum-iron-silicate composite flocculant, which consists of a three-step process of preparation of primary products, impregnation of primary products and separation of products. The preparation conditions of this production method are harsh. Roasting under temperature conditions for 0.5 to 2 hours, if it is used in industrial production, the investment cost of process equipment, production operation cost, etc. are high, and the cost of waste water treatment is too high

Method used

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  • 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 of producing efficient composite polysilicate aluminum and ferric flocculants with fly ash and kaolin. The method is to evenly mix the fly ash, the kaolin and quick lime with water according to a certain proportion. Then, the mixture is heated for 4-8 hours under the temperature of 50-120 degree Celsius, cooled naturally and filtered. The pH value of the filtering liquid is adjusted to be 6-10 to obtain filtering liquid I. Obtained filter residues are added with industrial hydrochloric acid with the concentration of 36.7 percent, heated for 4-8 hours under the temperature of 50-120 degree Celsius, cooled naturally and filtered to obtain filtering liquid II. The filtering liquid I and the filtering liquid II are mixed according to the volume ratio of 1 to 1 and stirred. The pH value is adjusted to be 3-5. Liquid product prepared by the invention is obtained after the standing. The product colligates the advantages of aluminum salt and ferric salt flocculants. The stability and the water purifying water effect are perfect. Water which has been treated does not contain aluminum and other harmful components. The happenings of senile dementia can be effectively reduced. And with waste materials and the fly ash used as the raw materials, the method has the advantages of low production cost, high product added value good economic benefit, environmental benefit and social benefit.

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 high-efficiency 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-...

Claims

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Application Information

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Patent Type & Authority Applications(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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