Plasma production and application of nano-dispersed pigments from wastes after water treatment

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Application

Production of high-quality nano-dispersed pigments (coloring, heat-resistant, etc.) from waste after water treatment for paints and varnishes, parting paints for foundry production, etc.

Current stage

An effective and environmentally safe utilization of such wastes can be achieved by means of plasma utilization of optimal in the composition dispersed combustible aqueous-organic compositions on the bases of OVP.

Optimal compositions with the adiabatic combustion temperature of Tad ≈ 1200 °C providing environmentally safe utilization of such waste have been defined as a result of calculations of the combustion parameters of various water-organic compositions on the basis of OVP “OVP - Water - Spirit (acetone, etc.)".

Optimal modes for practical implementation of the process have been defined as a result of thermodynamic simulation of the process in a wide range of temperatures (300÷4000 K) and mass fractions of the air cooled plasma reactor (10 ÷ 95%).

Experimental research of the process of plasma utilization of model aqueous-organic compositions on the basis of OVP in air plasma of VHF-discharge have been carried out on the laboratory plasma stand “Plasma module on the basis of the high-frequency generator VCHG8-60/13-01”. Experimental batches of pigments, including magnetic iron oxide (Fe2O3), have been produced using recommended modes.

The process of magnetic separation from aqueous suspensions of the produced pigments has been investigated. The possibility of application of magnetic separators for the effective removal from aqueous suspensions after the unit of “wet” cleaning of exhaust gases from the reactor of the plasma generator is shown.

Summary

The process of water and wastewater treatment on industrial enterprises generates waste in the form of precipitation which, due to the absence of treatment technologies, either stored or discharged into water bodies, which causes serious deterioration of the environmental situation in the region. The volume of such waste is millions of tons (only in Russia).

It is proposed to utilize such waste in a non-equilibrium air plasma of VHF-discharge in the form of  optimal in composition dispersed combustible aqueous-organic compositions, which will ensure an environmentally safe and cost-effective utilization of such waste and will allow producing various nano-dispersed pigments for production of competitive products on its basis. 

The results of the research can be used for manufacturing of the equipment and development of the technology for utilization of various industrial wastes after water treatment.