INFLUENCE OF FLOCCULANT TYPE ON STRENGTH CHARACTERISTICS OF FLOCS IN CLAY-SALT SUSPENSIONS

  • Olga R. Seredkina Perm National Research Polytechnic University
  • Olesya V. Rakhimova Perm National Research Polytechnic University
  • Sergey V. Lanovetskiy Perm National Research Polytechnic University
Keywords: flocculation, reflocculation, floc strength, clay-salt sludge

Abstract

The results of studies on the effect of the flocculant type on the strength characteristics of floccules in clay-salt suspensions, obtained using a laser analyzer of particle size Lasentec D600L FBRM systems were presented in the article. The coefficients of strength and reduction of aggregates formed by polyacrylamide and its anionic and cationic copolymers were determined. Increasing the speed of mixing by using of polymers various types leads to the destruction of the formed aggregates in the flocculated suspension. The size of flocs induced by a cationic flocculant is reduced from 250 to 110 mm, for anionic and non-ionic flocculants - from 500 to 250 mm. The dependence of floc strength on the macromolecules adsorption mechanism on a solid surface was established. The decrease in hydrodynamic effects entails the partial restoration of floccules. It was shown that the recovery of flocs for all studied polymers was limited, which indicates a significant irreversibility of the aggregates destruction process. When using cationic flocculant, the ability to restore the aggregates is 2.5 times lower compared to anionic and non-ionic polymers. For nonionic and anionic polymers, the dependence of flocs coefficients of strength and recovery on the flocculant dosage was established. Dosage of cationic polymer does not affect these indicators. The dynamics of flocculation, destruction and reflocculation processes using various flocculants was considered. The influence of the charge type and polymer consumption on the mechanism of particles interaction was established. The potential possibility of using the obtained results to improve the technology of potassium chloride production at the stages of thickening and dehydrating clay-salt sludge was shown.

References

Kirichenko L.N., Sabirov R.Kh., Skvyrsky L.Ya., Te-terina N.N. Technology of flotation enrichment of pot-ashe ore. Perm: OGUP «Solikamsk Printing House». 2002. 484 p. (in Russian).

Koshevar V.D. Organo-mineral dispersions. Regulation of their properties and application. Minsk: Belorus. nauka. 2008. 312 p. (in Russian).

Moruzzi R.B., Oliveira A.L., Conceição F.T., Gregory J., Campos L.C. Fractal dimension of large aggregates under different flocculation conditions. Sci. Total Environ. 2017. V. 609. N 31. P. 807-814. DOI: 10.1016/j.scitotenv.2017.07.194.

Li T., Zhu Z., Wang D., Yao Ch., Tang H. The strength and fractal dimension characteristics of alum-kaolin flocs. Int. J. Miner. Process. 2007. V. 82. N 1. P. 23-29. DOI: 10.1016/j.minpro.2006.09.012.

Krivenko I.V., Namestnikov V.V., Mukhutdinova G.M., Khatsrinov A.I. On possibility of polyacrylamide derivatives application for water treatment and overflow processes of nitrate cellulose plants. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2008. V. 51. N 2. С. 110-114 (in Russian).

Hogg R. Bridging flocculation by polymers. Kona Powder Part. J. 2012. V. 30. P. 3-14. DOI:10.14356/kona.2013005.

Fellows C.M., Doherty W.O.S. Insights into Bridging Flocculation. Macromol. Symp. 2006. V. 231. P. 1-10. DOI: 10.1002/masy.200590012.

Barany S., Meszaros R., Kozakova I., Shkvarla I. Kinetics and mechanism of flocculation of bentonite and kaolin suspensions with polyelectrolytes and the strength of flocs. Kolloid. Zhurn. 2009. V. 71. N 3. P. 291-298 (in Russian). DOI: 10.1134/S1061933X09030016.

Binahmed S., Ayoub G., Al-Hindi M., Azizi F. The effect of fast mixing conditions on the coagulation–flocculation process of highly turbid suspensions using liquid bittern coagulant. Des. Water Treat. 2015. V. 53. N 12. P. 3388-3396. DOI: 10.1080/19443994.2014.933043.

Saritha V., Srinivas N., Srikanth Vuppala N. V. Analysis and optimization of coagulation and flocculation process. Appl. Water Sci. 2017. V. 7. I. 1. P. 451-460. DOI: 10.1007/s13201-014-0262-y.

Tajuddin H. A., Abdullah L.C., Idris A., Choong T.S.Y. Effluent quality of anaerobic palm oil mill effluent (pome) wastewater using organic coagulant. Int. J. Sci. Res. 2015. V. 4. N 5. P. 667-677.

Park S.-M., Heo T.-Y., Park J.-G., Jun H.-B. Effects of hydrodynamics and coagulant doses on particle aggregation during a rapid mixing. Environ. Eng. Res. 2016. V. 21. N 4. P. 365-372. DOI: 10.4491/eer.2016.046.

Zhu Z., Li T., Lu J., Wang D., Yao C. Characterization of kaolin flocs formed by polyacrylamide as flocculation aids. Int. J. Miner. Process. 2009. V. 91. P. 94-99. DOI: 10.1016/j.minpro.2009.01.003.

Yukselen M.A., Gregori J. The effect of rapid mixing on the break-up and reformation of flocs. Chem. Technol. Biotechnol. 2004. V. 79. P. 782-788. DOI: 10.1002/jctb.1056.

Jarvis P., Jefferson B., Gregory J., Parsons S.A. A review of floc strength and breakage. Water Res. 2005. V. 39. P. 3121-3137. DOI: 10.1016/j.watres.2005.05.022.

Solomentseva I., Barany S., Gregory J. The effect of mixing on stability and break-up of aggregates formed from aluminum sulfate hydrolysis products. Colloids Surf. A. 2007. V. 298. N 1-2. P. 34-41. DOI: 10.1016/j.colsurfa.2006.12.016.

Golberg G.Yu. Physico-chemical problems of flocculation of fine products of coal enrichment. Gorno Inform. Anal. Bull.. 2006. N 1. P. 346-348 (in Russian).

Meszaros R., Barany S., Solomentseva I. Effect of hydrodynamic conditions on the kinetics of bentonite suspension flocculation by cationic polyelectrolytes and the strength of formed flocs. Colloid J. 2010. V. 72. N 3. P. 409–416. DOI: 10.1134/S1061933X10030154.

Shkop A.A., Tseitlin M.A., Shestopalov A.V., Raiko V.F. Investigation of the strength of flocculation structures of polydisperse coal suspensions. Vostochno Evrop. Zhurn. Peredov. Tekhnol. 2017. V. 1. N 10 (85). P. 20-26 (in Russian). DOI: 10.15587/1729-4061.2017.91031.

Seredkina O.R., Rakhimova O.V., Lanovetskiy S.V. The research of the efficiency of flocculants used for clay-saltslurry precipitation. Coll. of papers 69 All-Russian Scientific and Technical Conference with Inter-national Participation. Yaroslavl’: Yaroslav. Gos. Tekhn. Univ. 2016. P. 145-148 (in Russian).

Seredkina O.R., Rakhimova O.V., Lanovetskiy S.V. The research of flocculation ability of polyacrylamide, prepared with aqueous-salt solution. Sovrem.Naukoem. Nekhnol. 2016. N 5-2. P. 291-295 (in Russian).

Seredkina O.R., Rakhimova O.V., Lanovetskiy S.V. The research into the influence of sylvinite ore fractional composition on clay slime flocculation efficiency. Abstr. of XX Mendeleev Congress on general and applied chem-istry. Ural Branch of the Russian Academy of Sciences. 2016. V. 3. P. 218.

Published
2020-05-13
How to Cite
Seredkina, O. R., Rakhimova, O. V., & Lanovetskiy, S. V. (2020). INFLUENCE OF FLOCCULANT TYPE ON STRENGTH CHARACTERISTICS OF FLOCS IN CLAY-SALT SUSPENSIONS. ChemChemTech, 63(6), 30-36. https://doi.org/10.6060/ivkkt.20206306.6085
Section
CHEMISTRY (inorganic, organic, analytical, physical, colloid and high-molecular compounds)