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Technology for preparing hybrid flocculant by gangue base raw material and hybrid flocculant prepared by the same

A technology of flocculant and gangue, which is applied in the process of preparing hybrid flocculant from gangue-based raw materials and the field of hybrid flocculant prepared by this process, can solve the problems of low polymerization initiation efficiency, influence on flocculation effect, and difficulty in dispersing products, etc., and achieve Reduce production cost and final product price, lower intercalation reaction barrier, and fast flocculation

Inactive Publication Date: 2014-07-23
JINING MEDICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this kind of inorganic-organic hybrid flocculant preparation method has the following disadvantages: 1. raw material selection, select untreated fly ash for use as raw material, raw material utilization is poor; 2. the selection of initiator, select potassium persulfate, persulfuric acid for use Ammonium, azobisisobutyronitrile, azobisisoheptanonitrile, dibenzoyl peroxide or hydrogen peroxide are initiators, and the polymerization initiation efficiency is low; ③Because of product stability factors, the resulting product needs vacuum drying, but vacuum drying The product obtained after drying is very hard and difficult to crush, and the crushed product is difficult to disperse in sewage, which affects the flocculation effect
However, the filter residue after acid and alkali extraction in this process is often discarded, and the utilization is not sufficient.

Method used

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  • Technology for preparing hybrid flocculant by gangue base raw material and hybrid flocculant prepared by the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, using fly ash to prepare a hybrid flocculant, the specific steps are as follows:

[0028] (1) material preparation: fly ash is passed through 80 mesh sieves;

[0029] (2) Alkaline extraction: add 10% NaOH solution to the active raw material in step 1, and the liquid-solid weight ratio with fly ash fine powder is 2: 1; Reaction time 2h, solid-liquid separation, the filtrate of collecting is alkali extraction liquid ;

[0030] (3) acid extraction: in the filter residue of step 2, add the hydrochloric acid solution of 10% concentration, liquid-solid weight ratio is 2: 1; Reaction time 2h, solid-liquid separation, the filtrate of collecting is acid extraction liquid, and the filter residue of collecting Modified fly ash filter residue;

[0031] (4) Reaction: wash the modified fly ash filter residue obtained in step 3 to neutrality, add acrylamide with a concentration of 5%, the weight ratio of filter residue to acrylamide is 0.2:1, and stir for 0.5h to obtai...

Embodiment 2

[0034] Embodiment 2, using fly ash to prepare hybrid flocculant, the specific steps are as follows:

[0035] (1) material preparation: fly ash is passed through 80 mesh sieves;

[0036] (2) Alkaline extraction: add 15% NaOH solution to the active raw material in step 1, and the liquid-solid weight ratio with fly ash fine powder is 5: 1; Reaction time 2h, solid-liquid separation, the filtrate of collecting is alkali extraction liquid , reaction temperature: 100°C, reaction pressure 5 MPa;

[0037] (3) acid extraction: in the filter residue of step 2, add the sulfuric acid solution of 15% concentration, liquid-solid weight ratio is 5: 1; Reaction time 2h, solid-liquid separation, the filtrate that collects is acid extraction liquid, and the filter residue that collects Modified fly ash filter residue, reaction temperature: 100°C, reaction pressure 5 MPa;

[0038] (4) Reaction: wash the modified fly ash filter residue obtained in step 3 until neutral, add acrylamide with a conc...

Embodiment 3

[0041] Embodiment 3, using fly ash to prepare a hybrid flocculant, the specific steps are as follows:

[0042] (1) material preparation: fly ash is passed through a 100-mesh sieve;

[0043] (2) Alkali extraction: add 30% NaOH solution to the active raw material in step 1, and the liquid-solid weight ratio with fly ash fine powder is 5: 1; Reaction time 3h, solid-liquid separation, the filtrate of collecting is alkali extraction liquid , reaction temperature: 120°C, reaction pressure 1 MPa;

[0044] (3) acid extraction: in the filter residue of step 2, add the nitric acid solution of 30% concentration, liquid-solid weight ratio is 5: 1; Reaction time 3h, solid-liquid separation, the filtrate that collects is acid extraction liquid, and the filter residue that collects Modified fly ash filter residue, reaction temperature: 120°C, reaction pressure 1 MPa;

[0045] (4) Reaction: wash the modified fly ash filter residue obtained in step 3 to neutrality, add acrylamide with a conc...

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Abstract

The present invention discloses a technology for preparing hybrid flocculant by gangue base raw material and a hybrid flocculant prepared by the same. The steps of the technology are as follows: preparing the hybrid flocculant by the gangue base waste residue; during the process of synthesis, preparing the gangue base raw material and stirring together the modified gauge base filter residue and acrylamide after alkali and acid extraction; performing vacuum-pumping to pass nitrogen; and adding an initiator to perform polymerization, so as to obtain the gray viscous hybrid flocculant in a gel state. Compare with the prior art, the gangue waste residue of the technology can be fully used, and thus the waste control by waste is realized. The obtained hybrid flocculant has advantages of a strong flocculation ability, high sedimentation speed and high compactness. COD and BOD removal rate of the technology is much higher than that of a single polyacrylamide system and a simple mixture of modified gauge base filter residue and polyacrylamide. The technology also has advantages of less quantity of reagent, relatively higher processing efficiency of waste water of drilling well and coalification, and obviously higher removal efficiency of water turbidity and chroma.

Description

【Technical field】 [0001] The invention relates to a material preparation process and the material prepared according to the process, in particular to a process for preparing a hybrid flocculant from coal gangue or fly ash, and the hybrid flocculant prepared by the process. 【Background technique】 [0002] Flocculation and sedimentation technology is a high-efficiency, economical and simple physical and chemical technology in the process of sewage treatment. The polymer flocculants used are divided into two categories: inorganic polymer flocculants and synthetic organic polymer flocculants. The traditional inorganic polymer flocculants are subject to high dosage due to their large dosage, slow settling rate and certain corrosiveness. The environmental impact is great, and the secondary pollution caused by it restricts its development. The use of organic flocculants in sewage treatment began in the late 1950s. Compared with inorganic flocculants, it has more advantages, such a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52
Inventor 王慧云全先高丁林孙珊珊郭继香
Owner JINING MEDICAL UNIV
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