The purification of sewage water of flotation coal enrichment by the method of ultra flocculation
Journal Title: Вісник Одеської державної академії будівництва та архітектури - Year 2018, Vol 1, Issue 72
Abstract
Coal flotation concentrate formed in the process of coal enrichment is the fine concentrated, stable suspension that is difficult to separate by traditional methods. From the theory developed in previous works, it follows that ultraflocculation (UF) allows at least a 1.5-2 times increase in the efficiency of not only diluted but also concentrated suspensions formed in the ore-enrichment industry. The effectiveness of flocculation in this case is increased by using the appropriate hydrodynamic treatment of the suspension immediately after the introduction of the flocculant into it. The results of the research of the effectiveness of UF during the separation of coal concentrate flotation concentrates are presented. The object of the study was a flotation concentrate obtained from a coal enrichment plant. The concentration of the suspension was 215 g/l, the particle size of the dispersed phase varied from 5 to 50 μm. The high-molecular anionic flocculant KANFLOCK-130A (working concentration of 1 g/l) is used as an intensifier of the aggregation process of slurry particles. The main regularities of the process of ultra flocculation phase separation of stable concentrated coal suspensions with their subsequent vacuum filtration have been researched. It has been determined that the use of preliminary ultraflocculation of the suspension gives a 1.5-1.7 times higher productivity of the separation equipment, a 2.5-3 times lower consumption of the flocculant and 1.5 times increases a degree of purification of the aqueous phase compared with the «traditional flocculation». Rational conditions for conducting the process of ultra flocculation: flocculant consumption - 30 g/t, processing time - 6 s, medium velocity gradient ‒ 750 s-1. Application of the technology of preliminary ultraflocculation of coal flotation concentrate in the process of its separation allows to achieve the effect of separation of suspended and colloid substances up to 97%. The concentration of coal in the purified aqueous phase does not exceed 6 g/l, which allows it to be reused as a working medium in the technological process of coal enrichment. A multi-purpose solution of the problem of optimizing the phase separation of coal flotation concentrates is a complex task requiring further research.
Authors and Affiliations
N. N. , Rulyov, T. V. , Nebesnova
Keywords
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