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

3 Cites 25 Cited by

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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 pickl...

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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.

Application Domain

Water/sewage treatment by flocculation/precipitation

Technology Topic

SlagSpent acid +9

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Examples

Experimental program(3)
Effect test(1)

Example Embodiment

[0046] Example 1

[0047] The method for preparing a composite flocculant by adopting fly ash and pickling waste liquid in the present invention includes the following steps:

[0048] A. Roasting: add fly ash and Na in the crucible 2 CO 3 , The roasting temperature is 800℃, and the time is 50min, so that the aluminum and silicon in the fly ash will be transformed into the amorphous body or crystal with greater activity;

[0049] B. Acid leaching: add the waste pickling liquid to the roasted fly ash, stir for 0.5h in a constant temperature water bath at 80°C, and filter to obtain acid leaching filtrate and filter residue. The filter residue is dried and finely ground; The main components of the waste liquid include 11% sulfuric acid and 19% ferrous sulfate;

[0050] C. Alkali dissolution: Add the filter residue in step B to an alkaline solution and boil for 4 hours, filter the reaction solution, and the filtrate is a sodium silicate solution;

[0051] D. Polymerization with acid addition: the above sodium silicate solution is stirred with waste acid to adjust the pH of the solution to 2.5 and then polymerized for 0.5 h to obtain a polysilicic acid solution; wherein the waste acid is sulfuric acid waste liquid;

[0052] E. Mix the above polysilicic acid solution with the acid leaching filtrate, stir at 45°C for 50 minutes, and mature for 36 hours to obtain a red-brown colloidal liquid, which is a composite flocculant polyaluminum iron silicate.

Example Embodiment

[0053] Example 2

[0054] The method for preparing a composite flocculant by adopting fly ash and pickling waste liquid in the present invention includes the following steps:

[0055] A. Roasting: add fly ash and Na in the crucible 2 CO 3 , The roasting temperature is 850℃, and the time is 60min, so that the aluminum and silicon in the fly ash will be transformed into the amorphous body or crystal with greater activity;

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

[0057] C. Alkali dissolution: Add the filter residue in step B to an alkaline solution and boil for 5 hours, filter the reaction solution, and the filtrate is a sodium silicate solution;

[0058] D. Polymerization with acid addition: the above sodium silicate solution is stirred with waste acid to adjust the pH of the solution to 3 and then polymerized for 1 hour to obtain a polysilicic acid solution; wherein the waste acid is sulfuric acid waste liquid;

[0059] E. Mix the above polysilicic acid solution with the acid leaching filtrate, stir at 50°C for 60 minutes, and mature for 24 hours to obtain a red-brown colloidal liquid, which is a composite flocculant polyaluminum iron silicate.

Example Embodiment

[0060] Example 3

[0061] The method for preparing a composite flocculant by adopting fly ash and pickling waste liquid in the present invention includes the following steps:

[0062] A. Roasting: add fly ash and Na in the crucible 2 CO 3 , The roasting temperature is 950℃, and the time is 80min, so that the aluminum and silicon in the fly ash will be transformed into the amorphous body or crystal with greater activity;

[0063] B. Acid leaching: add the waste pickling solution to the roasted fly ash, stir for 1.5h in a constant temperature water bath at 100°C, and filter to obtain the acid leaching filtrate and filter residue. The filter residue is dried and finely ground; The main components of the waste liquid include 11% sulfuric acid and 19% ferrous sulfate;

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

[0065] D. Polymerization with acid addition: the above sodium silicate solution is stirred with waste acid to adjust the pH of the solution to 3.5 and then polymerized for 1.5 hours to obtain a polysilicic acid solution; wherein the waste acid is sulfuric acid waste liquid;

[0066] E. Mix the above polysilicic acid solution with the acid leaching filtrate, stir at 55°C for 60 minutes, and mature for 24 hours to obtain the product as a reddish-brown colloidal liquid, which is a composite flocculant polyaluminum iron silicate.

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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