Rama Murthy Yanamandra | Gulbarga University (original) (raw)
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Papers by Rama Murthy Yanamandra
Transactions of the Indian Institute of Metals
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Minerals Engineering
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ABSTRACT
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ABSTRACT
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Powder Technology, 2012
ABSTRACT
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Powder Technology, 2012
ABSTRACT
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Minerals Engineering, 2011
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Minerals Engineering, 2007
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Proceedings of the XI International Seminar on Mineral Processing Technology (MPT-2010), 2010
Nickel laterites form~ 75% of known nickel resources whereas majority of nickel is produced from ... more Nickel laterites form~ 75% of known nickel resources whereas majority of nickel is produced from sulphide sources. Nickel bearing laterite and chromitiferous overburden are the only source of nickel available in India. In India, 5,000,000 T of such overburden is generated each year in addition to the 140,000,000 T that has already been accumulated over several years of mining and it is estimated to increase with the consumption of chrome ore. With the depletion of sulphide deposits and for the future supply of nickel, the industry must ...
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Minerals Engineering, 2007
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ABSTRACT
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Proceedings of the XI …, Jan 1, 2010
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Process improvements in an operating plant are always challenging. Mineral beneficiation plants b... more Process improvements in an operating plant are always challenging. Mineral beneficiation plants based on gravity concentration techniques need continuous evaluation and monitoring of its processes for getting maximum recovery and better grades. But, in an operating plant it is very difficult to control all the parameters due to numerous reasons such as unsteady operation, fluctuation in the quality of run-off-mine ore, overall flow rate etc. For better understanding of the beneficiation circuit, it is necessary to evaluate the critical operating parameters which affect the performance in terms of grade, recovery and throughput including losses of valuable materials into tailing. Accurate data collection and proper data interpretation followed by making necessary change which is implementable in an operating plant play very critical role in performance of the circuit. In case of gravity operated beneficiation circuits of chrome ores where the quality of the feed and physical parameters varies continuously, the operators are required to modify the critical operating process parameters on continuous basis which is very difficult and tiresome. There are many causes of the data variability, including both error (sampling and assay), and real variation in performance due to changes in ore mineralogy, operating conditions and other factors. In this article, attempts made to evaluate the performance of ultra-fine beneficiation circuit in terms of silica reduction in the concentrate of chrome ore beneficiation plant (COB), India are discussed. The approach adopted and practical problems encountered during the study were also discussed. Results obtained from plant audit based on the above methodology has shown that SiO2 content in the concentrate can be reduced to <4%.
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Around 90% of the chromite resources of India are concentrated in the Boula-Nuasahi Sukinda belt ... more Around 90% of the chromite resources of India are concentrated in the Boula-Nuasahi Sukinda belt
of Orissa state. In order to conserve these valuable ore resources strategically, several companies
established chrome ore beneficiation plants in this region. The general beneficiation process in
these plants consists of gravity unit operations such as Floatex density separator, spiral, wet
shaking table etc. Most of these gravity circuits suffer huge losses of valuable minerals in the
tailing. Any attempt towards decreasing these losses would not only increase the limited reserves
in India but also make the economics of the operations more attractive. Apart from the liberation
phenomena, in many of the operating plants considerable quantity of values are lost in the tailings,
due to inconsistent feed quality, inappropriate selection of operating and design parameters.
Mineral engineers in this regard have to play a proactive and continuous role to improve the
performance of all separating units by modifying even small changes based on tests conducted in
laboratory under controlled conditions followed by attempts to make necessary changes in the
plant. For such improvements, accurate data collection and proper data interpretation followed by
making necessary change which is implementable in an operating plant play very critical role in
performance of the circuit. Databank collected over a period of time under various conditions would
also help in overcoming the future problems related to either variation in the feed characteristics or
specific demand by metallurgical industries. The above concept was adopted in one of the
operating chromite beneficiation plant at Sukinda. The approach adopted and practical problems
encountered during the study were reported in this paper. The result of trial campaign has shown
that, an overall product assaying 30.2% Cr2O3 from the feed (18% Cr2O3 ) can be produced to in
single stage. The final discards of the process contain 12% Cr2O3.
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Supply of world chromite (chrome ore) has come under severe pressure over the past year driven by... more Supply of world chromite (chrome ore) has come under severe pressure over the past year driven by
strong demand for ferrochrome used in ferroalloy production for making stainless steel. Many of the strategic
minerals are inputs into products in fast-changing markets. This article reviews the major process
flow sheets in practice for the recovery of chromite values from various types of ores and critical issues
related to chromite ore beneficiation. The comprehensive condensation of pertinent facts is intended to
provide a single reference source rather than the reader perusing many articles. Emphasis is placed on
different processes developed in identifying and solving critical plant problems.
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Transactions of the Indian Institute of Metals
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Minerals Engineering
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ABSTRACT
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ABSTRACT
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Powder Technology, 2012
ABSTRACT
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Powder Technology, 2012
ABSTRACT
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Minerals Engineering, 2011
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Minerals Engineering, 2007
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Proceedings of the XI International Seminar on Mineral Processing Technology (MPT-2010), 2010
Nickel laterites form~ 75% of known nickel resources whereas majority of nickel is produced from ... more Nickel laterites form~ 75% of known nickel resources whereas majority of nickel is produced from sulphide sources. Nickel bearing laterite and chromitiferous overburden are the only source of nickel available in India. In India, 5,000,000 T of such overburden is generated each year in addition to the 140,000,000 T that has already been accumulated over several years of mining and it is estimated to increase with the consumption of chrome ore. With the depletion of sulphide deposits and for the future supply of nickel, the industry must ...
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Minerals Engineering, 2007
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ABSTRACT
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Proceedings of the XI …, Jan 1, 2010
Bookmarks Related papers MentionsView impact
Process improvements in an operating plant are always challenging. Mineral beneficiation plants b... more Process improvements in an operating plant are always challenging. Mineral beneficiation plants based on gravity concentration techniques need continuous evaluation and monitoring of its processes for getting maximum recovery and better grades. But, in an operating plant it is very difficult to control all the parameters due to numerous reasons such as unsteady operation, fluctuation in the quality of run-off-mine ore, overall flow rate etc. For better understanding of the beneficiation circuit, it is necessary to evaluate the critical operating parameters which affect the performance in terms of grade, recovery and throughput including losses of valuable materials into tailing. Accurate data collection and proper data interpretation followed by making necessary change which is implementable in an operating plant play very critical role in performance of the circuit. In case of gravity operated beneficiation circuits of chrome ores where the quality of the feed and physical parameters varies continuously, the operators are required to modify the critical operating process parameters on continuous basis which is very difficult and tiresome. There are many causes of the data variability, including both error (sampling and assay), and real variation in performance due to changes in ore mineralogy, operating conditions and other factors. In this article, attempts made to evaluate the performance of ultra-fine beneficiation circuit in terms of silica reduction in the concentrate of chrome ore beneficiation plant (COB), India are discussed. The approach adopted and practical problems encountered during the study were also discussed. Results obtained from plant audit based on the above methodology has shown that SiO2 content in the concentrate can be reduced to <4%.
Bookmarks Related papers MentionsView impact
Around 90% of the chromite resources of India are concentrated in the Boula-Nuasahi Sukinda belt ... more Around 90% of the chromite resources of India are concentrated in the Boula-Nuasahi Sukinda belt
of Orissa state. In order to conserve these valuable ore resources strategically, several companies
established chrome ore beneficiation plants in this region. The general beneficiation process in
these plants consists of gravity unit operations such as Floatex density separator, spiral, wet
shaking table etc. Most of these gravity circuits suffer huge losses of valuable minerals in the
tailing. Any attempt towards decreasing these losses would not only increase the limited reserves
in India but also make the economics of the operations more attractive. Apart from the liberation
phenomena, in many of the operating plants considerable quantity of values are lost in the tailings,
due to inconsistent feed quality, inappropriate selection of operating and design parameters.
Mineral engineers in this regard have to play a proactive and continuous role to improve the
performance of all separating units by modifying even small changes based on tests conducted in
laboratory under controlled conditions followed by attempts to make necessary changes in the
plant. For such improvements, accurate data collection and proper data interpretation followed by
making necessary change which is implementable in an operating plant play very critical role in
performance of the circuit. Databank collected over a period of time under various conditions would
also help in overcoming the future problems related to either variation in the feed characteristics or
specific demand by metallurgical industries. The above concept was adopted in one of the
operating chromite beneficiation plant at Sukinda. The approach adopted and practical problems
encountered during the study were reported in this paper. The result of trial campaign has shown
that, an overall product assaying 30.2% Cr2O3 from the feed (18% Cr2O3 ) can be produced to in
single stage. The final discards of the process contain 12% Cr2O3.
Bookmarks Related papers MentionsView impact
Supply of world chromite (chrome ore) has come under severe pressure over the past year driven by... more Supply of world chromite (chrome ore) has come under severe pressure over the past year driven by
strong demand for ferrochrome used in ferroalloy production for making stainless steel. Many of the strategic
minerals are inputs into products in fast-changing markets. This article reviews the major process
flow sheets in practice for the recovery of chromite values from various types of ores and critical issues
related to chromite ore beneficiation. The comprehensive condensation of pertinent facts is intended to
provide a single reference source rather than the reader perusing many articles. Emphasis is placed on
different processes developed in identifying and solving critical plant problems.
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