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Method for preparing polymeric ferric boron silicate aluminium magnesium flocculating agent

The technology of magnesium aluminum iron and boron silicate is applied in the field of preparation of polymeric boron silicate magnesium aluminum iron flocculants, which can solve the problems of poor stability, self-flocculation and turbidity of polymeric silicate metal salts, and achieves great popularization and application value. , less dose, cost-effective effect

Inactive Publication Date: 2008-02-06
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Invention patent CN1907878A discloses a preparation method of polyaluminum iron silicate flocculant, which is compatible with the advantages of aluminum-based flocculants and iron-based flocculants, but this method is prone to turbidity and self-flocculation during the preparation process
In addition, the above-mentioned polymeric metal silicate has poor stability, which limits its practical application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh sodium silicate (Na 2 SiO 3 9H 2 (2) 28.4 grams are prepared into 500mL 0.2mol / l sodium silicate solution, then added to sulfuric acid solution to make its pH value reach 1.0, and stir rapidly for about 1 hour until the solution gradually appears light blue to obtain polymerized silicic acid; Add 300ml of 0.5mol / l aluminum sulfate solution, 50ml of 0.2mol / l borax, 40ml of 0.5mol / l magnesium sulfate solution, and 100ml of 0.5mol / l iron sulfate solution to the acid, and adjust the pH value to 1.0 under vigorous stirring. Stir fully for 4 hours, and polycondensation reaction occurs; stop stirring and let it stand for 48 hours to mature to obtain polymerized boron-magnesium-aluminum-iron-silicate flocculant, which is stored in the dark at room temperature.

[0018] Add dilute sulfuric acid dropwise to 500mL printing and dyeing wastewater to adjust the pH value to 6, add 3.0mL polymeric boron magnesium aluminum iron flocculant, stir rapidly for 2 minutes, then stir s...

Embodiment 2

[0020] Weigh sodium silicate (Na 2 SiO 3 9H 2 (2) 56.8 grams were prepared into 500mL 0.4mol / l sodium silicate solution, then added to sulfuric acid solution to make its pH value reach 2.0, and stirred rapidly for about 3 hours until light blue gradually appeared in the solution to obtain polymerized silicic acid; Add 200ml of 0.5mol / l aluminum sulfate solution, 100ml of 0.2mol / l borax, 80ml of 0.5mol / l magnesium sulfate solution, and 120ml of 0.5mol / l iron sulfate solution to the acid, and adjust the pH value to 2.0 under vigorous stirring. After fully stirring for 3 hours, a polycondensation reaction occurs; after stopping the stirring, let it stand for 48 hours to mature to obtain a polymerized boron-magnesium-aluminum-iron-silicate flocculant, which is stored in the dark at room temperature.

[0021] Add dilute sulfuric acid dropwise to 500mL printing and dyeing wastewater to adjust the pH value to 10, add 2mL polymeric boron-magnesium-aluminum-iron-iron silicate floccul...

Embodiment 3

[0023] Weigh sodium silicate (Na 2 SiO 3 9H 2 (2) 42.6 grams are formulated into 500mL 0.3mol / l sodium silicate solution, then added to the sulfuric acid solution to make the pH value reach 3.0, and stir rapidly for about 2 hours until the solution gradually appears light blue to obtain polymeric silicic acid; Add 150ml of 0.5mol / l aluminum sulfate solution, 120ml of 0.2mol / l borax, 60ml of 0.5mol / l magnesium sulfate solution, and 150ml of 0.5mol / l iron sulfate solution to the acid, and adjust the pH value to 3.0 under vigorous stirring. Fully stirred for 2 hours, polycondensation reaction occurred. After the stirring was stopped, it was allowed to stand for 48 hours to mature to obtain a polymeric boron-magnesium-aluminum-iron-silicate flocculant, which was stored in the dark at room temperature.

[0024] Add dilute sulfuric acid dropwise to 500mL printing and dyeing wastewater to adjust the pH value to 8, add 2.5mL polymeric boron magnesium aluminum iron flocculant, stir ...

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Abstract

The invention discloses a fabrication method for a flocculant of polymerized silicic acid boron, magnalium, aluminium and ferro, and adopts sodium silicate, borax, aluminum salt, magnesium salt and iron saltferro-salt as main raw materials, and adopts water as a reacting solution; firstly the sodium silicate is added to a sulfuric acid solution, a pH value is adjusted to a certain degree, a quick mixing process is followed, a poly silicic acid is made out after reacting for a period of time; the aluminum salt, the borax, the magnesium salt and the ferro-salt are added to the poly silicic acid according to a certain chemical stoichiometric ratio and sequence requirement, the pH value is adjusted, and the quick mixing process is followed, after a period of time in the condensation polymerization process, the flocculant of polymerized silicic acid boron, magnalium, aluminium and ferro can be made out after static placement and aging process; the fabrication of the flocculant by the invention is easy and simple, the operation is easy, the medicament input quantity is small, the CODCr removing rate and the decoloring rate are high, the service life is long with a stability.

Description

technical field [0001] The invention belongs to the field of water treatment; in particular, it relates to a preparation method of a polymerized boron-magnesium-aluminum-iron-silicate flocculant. Background technique [0002] At present, water treatment methods are divided into biochemical methods, electrochemical methods, ion exchange methods, adsorption methods, membrane separation methods, flocculation methods, etc. Among them, flocculation method is one of the most widely used and most economical treatment methods. Compared with other methods, the treatment cost and expense of the flocculation method are low, and it is one of the most commonly used key links in the water and sewage treatment process, and it is also one of the essential operating units. It is widely used in various industrial wastewater treatment Pretreatment, intermediate treatment or final treatment and tertiary treatment of urban sewage. As the flocculation process of the pre-treatment technology, its...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 林亲铁
Owner GUANGDONG UNIV OF TECH
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