Using Fly Ash to Preparare Polysilicate Aluminum Ferric Flocculant and Treating Coal Slurry

Abstract:

Solid waste resource utilization is a important way for sustainable economic development, environmental and ecological protection. Using adsorption and flocculation characteristics of fly ash to preparare fly ash-based inorganic flocculant and use it for treating slime water, make waste fly ash into treasure, not only solve environmental problems, but also has very important theoretical significance and application value.In this study, we use Na₂CO₃ melt to improve acid-soluble activity of fly ash, extract ideally the aluminum and iron silicon as active ingredients in the fly ash. On the basis of the solubilization experiment, we design orthogonal experiment about larger impact several factors on the the flocculant preparation of process: silicon and aluminum element ratio, silicon iron element ratio and curing temperature, the orthogonal experiment results show that the best optimum process conditions is: Si: Al (mole ratio) is 1:0.5, Si: Fe (molar ratio) is 1:0.5, curing temperature is 60°C, curing time is 2 hours. Finally, we use poly silicate aluminum iron flocculants prepared to do flocculation test on slime water, determine the best flocculation conditions is: when we treat slime water which concentration is 8g/L and volume is 250mL, the optimum dosage of polysilicate aluminum iron is 1.3mL, the transmittance gets to 74.2%, the flocculation effect is the best.

• Periodical: Advanced Materials Research (Volumes 1092-1093)
• Pages: 966-971
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1092-1093.966
• Online since: March 2015
• Authors: Jian Li Yang*, Mei Li Du, Gang Li
• Keywords: Coal Slime Water, Flocculation, Fly Ash, Poly Ferric Silicate Flocculant

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