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Method of preparing compound flocculating agent by utilizing fly ash and killing pickle

A technology of composite flocculant and pickling waste liquid, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of waste of resources, pollution of the environment, and incomprehensible utilization of enterprises, and achieve good results

Inactive Publication Date: 2013-11-06
宫惠峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the processing of iron and steel products, sulfuric acid is often used to pickle, rust, and scale the surface, resulting in a large amount of pickling waste, which many enterprises cannot comprehensively utilize. On the one hand, it pollutes the environment, on the other hand It also wastes resources

Method used

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  • Method of preparing compound flocculating agent by utilizing fly ash and killing pickle
  • Method of preparing compound flocculating agent by utilizing fly ash and killing pickle
  • Method of preparing compound flocculating agent by utilizing fly ash and killing pickle

Examples

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Effect test

Embodiment 1

[0047] The present invention adopts fly ash and pickling waste liquid to prepare the method for composite flocculant, comprises the following steps:

[0048] A. Roasting: Add fly ash and Na to the crucible 2 CO 3 , the calcination temperature is 800°C, and the time is 50min, so that the aluminum and silicon in the fly ash are transformed into highly active amorphous bodies or crystals;

[0049] B. Acid leaching: Add the pickling waste liquid to the roasted fly ash, stir in a constant temperature water bath at 80°C for 0.5h, filter to obtain the acid leaching filtrate and filter residue, dry the filter residue and grind finely; The waste liquid main component comprises sulfuric acid mass fraction 11%, ferrous sulfate mass fraction 19%;

[0050] C, alkali dissolution: add the filter residue in step B to the alkaline solution and boil for 4 hours, filter the reaction solution, and the filtrate is sodium silicate solution;

[0051] D. Polymerization by adding acid: add waste ac...

Embodiment 2

[0054] The present invention adopts fly ash and pickling waste liquid to prepare the method for composite flocculant, comprises the following steps:

[0055] A. Roasting: Add fly ash and Na to the crucible 2 CO 3 , the calcination temperature is 850°C, and the time is 60min, so that the aluminum and silicon in the fly ash are transformed into highly active amorphous bodies or crystals;

[0056] B. Acid leaching: Add the pickling waste liquid to the roasted fly ash, stir in a constant temperature water bath at 90°C for 1 hour, filter to obtain the acid leaching filtrate and filter residue, dry the filter residue and grind finely; the pickling waste The main components of the liquid include 11% by mass fraction of sulfuric acid and 19% by mass fraction of ferrous sulfate;

[0057] C, alkali dissolution: add the filter residue in step B to the alkaline solution and boil for 5h, filter the reaction solution, and the filtrate is sodium silicate solution;

[0058] D. Polymerizati...

Embodiment 3

[0061] The present invention adopts fly ash and pickling waste liquid to prepare the method for composite flocculant, comprises the following steps:

[0062] A. Roasting: Add fly ash and Na to the crucible 2 CO 3 , the calcination temperature is 950°C, and the time is 80 minutes, so that the aluminum and silicon in the fly ash are transformed into highly active amorphous bodies or crystals;

[0063] B. Acid leaching: add the pickling waste liquid to the roasted fly ash, stir in a constant temperature water bath at 100°C for 1.5 hours, filter to obtain the acid leaching filtrate and filter residue, dry the filter residue and grind finely; The waste liquid main component comprises sulfuric acid mass fraction 11%, ferrous sulfate mass fraction 19%;

[0064] C, alkali dissolution: add the filter residue in step B to the alkaline solution and boil for 6 hours, filter the reaction solution, and the filtrate is sodium silicate solution;

[0065] D. Polymerization by adding acid: a...

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Abstract

The invention discloses a method of preparing compound flocculating agent by utilizing fly ash and killing pickle. The method comprises following steps: (A) burning: adding fly ash and Na2CO3 in a crucible to make aluminum and silicon in the fly ash turn into more activated amorphous state or crystal; (B) acid soaking: adding killing pickle into the burned fly ash, stirring and then filtering in a constant temperature water bath, obtaining acid soaked filter liquid and filter slag, drying and grinding the filter slag; (C) alkali dissolving: adding the filter slag into an alkali solution to boil, then filtering the reaction liquid, and obtaining the filter liquid, which is the sodium silicate solution; (D) adding acid to polymerize: adding waste acid in the sodium silicate solution to adjust pH value and then having polymerization reactions under stirring, and obtaining the polysilicic acid solution; (E) mixing the polysilicic acid solution and the acid soaked filter liquid, stirring, curing and obtaining a reddish brown gel liquid, which is the compound flocculating agent. The invention is aimed to provide a preparation method, which has a simple technology and can effectively utilize fly ash and killing pickle in iron and steel plants.

Description

technical field [0001] The invention relates to a method for preparing a composite flocculant by using fly ash and pickling waste liquid. Background technique [0002] Composite inorganic polymer flocculants refer to substances that contain aluminum salts, iron salts and silicates and other substances that have flocculation or coagulation aiding effects. Aluminum-based and iron-based inorganic flocculants have been used as two types of inorganic flocculants. Ten years of development history, pure aluminum salts have disadvantages such as slow settling speed and poor decolorization effect, while pure iron salts have fast settling speed and good turbidity removal effect, but iron salts are highly corrosive. Therefore, the copolymerization of aluminum and iron into new polymers, which have the characteristics of general aluminum salts and iron salts, has become a new research direction. [0003] Activated silicic acid was used as a coagulant in water treatment in the middle an...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 宫惠峰王怀宇程永高张辉张孟存杨金梅侯素霞丁淑杰陈宁
Owner 宫惠峰
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