Froth flotation of iron ore by utilizing the chemical for reducing the coalescence and bursting of foam

Transcription

1 16 th Jan 2017 R&D and Scientific Services Department Report No. Sample description 6 th Iron Ore Feed Material of OBP-2 Plant Sample received from Tage solution (Tagefloat ) Date of sample receipt Date of report submission 12 th Jan 2017 Froth flotation of iron ore by utilizing the chemical for reducing the coalescence and bursting of foam Objective: Providing stability to the foam in dynamic condition of froth flotation for reducing the tailing loss while treating the iron ore fines. Background:- In the present scenario at JSW steel beneficiation plant the total weighted iron loss is around 20% in form of tailing. The tailing specification consisting T Fe%=47-50% with SiO2% = 10-15% and Al2O3= 12-15%. Due the presence of interlocked matrix between ore minerals (iron bearing mineral) and gangue minerals (silica, kaolinite, alumina hyderated etc) it is very difficult to beneficiate this through the conventional beneficiation route. Thus the surface phenomenon method i.e Froth Flotation process is best choice to deal with such kind of materials. While choosing froth flotation bubbles stability plays pivotal role to beneficiate with opting reverse flotation mechanism. Here in test work were carried with some frothing agent like MIBC and TegeSolution reagents Tagefloat- Experimental Results & Discussion: The iron ore sample was subjected to the following tests. i) Physical and chemical analysis of feed sample ii) Mineralogical studies iii) Flotation study 1. Physical and chemical analysis of feed sample:- For analysing the physical properties, the representative sample is subjected to dry sieve analysis. The d80% passing size are 65 micron of this representative sample.

2 2. Mineralogy of Feed Sample:- BENEFICIATION AND PELLETISATION GROUP Phase % Hematite Magnetite 0 Goethite 9.67 Quartz 8.72 Kaolinite Others Flotation study:- This stage consisting three step viz: Rougher, Cleaner and Scavenger banks of flotation cell. The cleaner flotation bank consisting concentrate for the pellet grade iron ore. The scavenger flotation bank consisting final discarded product of iron ore in froth form, where as the rougher sink and froth are recirculated with other respective flotation bank. The flowsheet for the flotation of iron ore is given below:-

3 Flotation of Thickener underflow TageFloat as frothing agent Rougher ph NaOH 10 % Solid 17% WT% T Fe SiO2 Al2O3 LOI Collector Sokem 0.8Kg/T Rotor Speed0 RPM Disperssant Starch 1 Kg/T 20gm/T Scavenger ph NaOH 9.5 % Solid 17% WT% T Fe SiO2 Al2O3 LOI Collector Sokem 1Kg/T Rotor Speed0 RPM Disperssant Starch 1.2 Kg/T 20gm/T Cleaner ph NaOH 9.5 % Solid 17% WT% T Fe SiO2 Al2O3 LOI Collector Sokem 0.8Kg/T Rotor Speed0 RPM Disperssant Starch 0.9 Kg/T 20gm/T Fig 1. Flotation results consisting 20gm/T Rougher ph NaOH 10 % Solid 17% WT% T Fe SiO2 Al2O3 LOI Collector Sokem 0.8Kg/T Rotor Speed0 RPM Disperssant Starch 1 Kg/T 10gm/T Scavenger ph NaOH 9.5 % Solid 17% WT% T Fe SiO2 Al2O3 LOI Collector Sokem 1Kg/T Rotor Speed0 RPM Disperssant Starch 1.2 Kg/T 10gm/T Cleaner ph NaOH 9.5 % Solid 17% WT% T Fe SiO2 Al2O3 LOI Collector Sokem 0.8Kg/T Rotor Speed0 RPM Disperssant Starch 0.9 Kg/T 10gm/T Fig 2. Flotation results consisting 10gm/T

4 Rougher Flotation of Thickener underflow with MIBC as Frothing agent ph NaOH 9.5 % Solid 17% WT% T Fe SiO2 Al2O3 LOI Collector Sokem 0.9Kg/T Rotor Speed 0 RPM Disperssant Starch 1 Kg/T MIBC 20gm/T Scavenger ph NaOH 9.5 % Solid 17% WT WT% T Fe SiO2 Al2O3 LOI Collector Sokem 1Kg/T Rotor Speed 0 RPM Disperssant Starch 1.2 Kg/T MIBC 20gm/T Cleaner ph NaOH 9.5 % Solid 17% WT% T Fe SiO2 Al2O3 LOI Collector Sokem 0.8Kg/T Rotor Speed 0 RPM Disperssant Starch 0.9 Kg/T MIBC 20gm/T Fig 3. Flotation results consisting MIBC@ 20gm/T Comparative results of two frothing reagents are tabulated below:- Products Tfe % SiO2% Al2O3% Recovery MIBC Tagefloat- Feed Feed Remaining Foam after equlibrium 123ml 156ml

5 Fig 7- Froth by using the Tagefloat- The pictorial view of foam coming as froth while using Tagefloat- are seems to be stable and the bubbles size are uniform. Thus probability of coalescence and bursting of foam are less due to maintaining the uniformity of the bubble size distribution throughout the experimental procedure. Fig 8- Froth by using MIBC The pictorial view of foam coming as froth while using MIBC are also seems to be stable but as the collection time of froth increases the chance of coalescence and bursting of foam increases. Thus there is a probability that undesirable minerals may come back into the pulp and hence recovery of valuable mineral (iron bearing mineral) may decreases.

6 BENEFICIATION AND PELLETISATION GROUP