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Studies on Preparation and Performance of a New Inorganic Polymer Flocculant-Poly Ferric Magniesum Silicate

Author: ZhangJingXiang
Tutor: DanBaoTian
School: Ocean University of China
Course: Marine Chemistry
Keywords: Magnesium iron silicate polymerization Flocculant Flocculation Stability
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 313
Quote: 5
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Abstract

In the treatment process, as an effective pre-flocculation method has been widely used. At home and abroad in the development and application of flocculant is growing very rapidly, the overall direction is determined by the low molecular weight to high molecular weight, from simple to complex. Aluminum and iron salts of inorganic polymer flocculant is more widely used in recent years, flocculants, but its use as a mainstream flocculant found there are still some drawbacks. To further improve the performance, people with aluminum and iron-based composite flocculant give more and more attention. Wherein the metal salt is introduced into the resulting drug called Polysilicate Polysilicate metal wastewater treatment chemicals, which both charge neutralization and adsorption bridging role, is a new type of field of water treatment, efficient inorganic polymer flocculation agent. In this paper, iron magnesium silicate polymer flocculant (Poly ferric magniesum silicate referred PFMS) preparation conditions, and the use of instrumental analysis and chemical analysis method of combining study of its physical and chemical properties. The main contents are as follows: 1. With sodium sulfate, iron sulfate, magnesium sulfate as raw materials, composite copolymerization, PFMS studied were first prepared silicon / metal molar ratio (Si / M), the silicon content (n SiO2), Fe / Mg molar ratio (Fe / Mg) and the amount of alkali (OH / M) and other factors on the performance and stability of flocculant; 2. use of Fe-Ferron timed complex colorimetric study PFMS distribution of iron in the form of ; 3. using infrared spectroscopy and X-ray diffraction method Polysilicate and Mg (Ⅱ), Fe (Ⅲ) and its hydrolysis product interactions were analyzed; using transmission power throughout the morphology observed PFMS ; 4 to dyeing wastewater was treated by coagulation mixing experiment, the system analyzes the PFMS flocculation performance, and with the PAC (PAC), ferric sulfate (PFS) and self-aggregation iron silicate (PFSS) and other conventional flocculants comparison examines PFMS in the removal of color, chemical oxygen demand (CODCr) and other characteristics discussed PFMS flocculation mechanism. Through the above, and obtained the following conclusions: 1.PFMS the flocculation stability test results show that the stability of flocculant with n SiO2, Si / M ratio, Fe / Mg ratio and OH / M ratio decreased and increased; With n SiO2 flocculation increased with the increase, with the increased use of flocculation base first increased and then decreased; Si / M ratio of between 0.5 to 2, Fe / Mg ratio between 0.25 and 2 remain good flocculant flocculation effect. 2.Fe-Ferron timed complex colorimetric study, OH / M ratio, Si / M ratio and aging time on the Fe (Ⅲ) species distribution have a greater impact. PFMS the Fe (a) the amount of maximum, i.e. mainly free of iron ions and hydroxyl monocytes / silicate-based complexes form, suitable OH / M ratio, Si / M ratio and the curing time can be improved ferrosilicon polynuclear hydroxy complex content, reducing the content of mononuclear hydroxy complexes, thereby increasing the power and capacity, adsorption bridging capability and sweep netting roll effect. 3.X-ray diffraction analysis showed that the flocculant is not a simple blend, but Fe3, SO42-and other poly-silicic acid and amorphous polymer formed. 4 infrared spectroscopy results show Polysilicate hydrolyzate and iron exists between its complexation. 5 Scanning electron microscopy studies show that, Fe3, Mg2 join Polysilicate changed the surface structure and surface structure PFMS by the amount of alkali and Si / M molar ratio greater impact. 6 for decolorization experiments show that the overall performance is better than bleaching PFMS PFS, PFSS and PAC, the COD removal efficiency is better than more than several flocculants, and the pH value of the treated wastewater effluent can reach pH ( 6-9) requirements.

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