Manganese-ore Beneficiation Plants for India

Big producers with large ore-reserves should put up their own beneficiation plants. But, since majority of the mang-anese mines are small producers and have only medium or smal! ore-reserves, and since about 50% of the manganese ores of India are of a complex nature requiring elaborate treatment, erection of custom type mills is the best way to their up-grading and conservation. The mills are to be designed to suit the ore characteristics of each region and located in central places on a regional basis

Recent Researches on the dressing of Low-Grade Manganese Ores in India

A case for the conservation of mineral wealth of India by banning selective mining has been made out. The necessity of beneficiating low-grade manganese ores is emphasized. Results obtained on several ores of different types are given and their beneficiation methods have been indicated. Exhaustive beneficiation tests have shown that enrichment to about 48 per cent Mn can be obtained with good recovery. Garnet can be removed by electrostatic separation. Fundamental studies on the flotability of manganese mineral or garnet to effect concentration are being conducted to examine the possibilities of flotation method of concentration

Vote of thanks

DR ATNIA RAM, SIR JEIIANGIR, DR BANERJII:, Ladies and Gentlemen : It is my pleasantduty this morning to say how much we appreciate your presence at this 16th Symposium on "Recent Developments in Non-ferrous Metals' Technology" which has just been inaugurated by Dr Atma Ram. We have with us today distinguished colleagues and fellowmen parti-cularly those from overseas countries who have travelled long distances to participate in this Symposium. We are grateful to them for their active association

Studies on Nundydroog gold ore with a view to improving gold recovery

GOLD is distributed widely in India though occurrence in workable quantities are not many. The most important gold mines are found in Kolar Gold Field situated in Mysore State. Although some 26 quartz lodes more or less parallel are known to occur, only one reef namely, the Champion, is being exploited and all the four mines viz., Mysore, Champion, Oreeaum and Nundydroog have been developed along its strike. During the last few years the ore from the western reef of Nundydroog is being mined in large tonnages. Nearly 21 000 tons per month are milled and the ore as an average carried a gold content of 5.6 dwt/ton. Since the ore body is highly mineralised, several metallurgical problems, such as greater wear and tear of machineries, difficulties during cyanidation due to the presence of sulphides, increased consumption of chemicals and higher tailing values are experienced at Kolar

Beneficiation and Processing of some Important Raw Materials, for Iron and Steel Production

India is committed to a policy of industrialisation and, along with others, the mineral industries are also expanding. The iron and still industry in the country can be considered to be fairly well est- ablished and with the expansion of the existing plants and the erection of three new plants, the steel ingot production is expected to go up to six million tons by the end of the Second plan period. Four ferro-manganese plants in the country viz. i) The Tata Iron and Steel Company's plant at joda ii) Jeypore Mining Syndicate's at Raygada (Orissa}, iii) Ferro Alloys Corporation at Garividi (Andhra) and (iv)Electro Metallurgical works Private Ltd., at Dandeli (Bombay) have gone into production and five more plants are expected to be established shortly to increase the production to 1,60,000 tons, of which 1 lakh will be for export and the remainder for internal consumption

Studies on Nundydroog Gold Ore with a view to Improving Gold Recovery

Gold is distributed widely in India though occurences in workable quantities are not many. The most important gold mines are found in Kolar Gold field situated in Mysore state. Although some 26 quartz lodes, more or less parallel are known to occur, only one reef namely, the champion, is being exploited and all the four mines viz. Mysore, Champion, Coregaum and Nundyroog have been developed along its strike.During the last few years the ore from the Western reef of Nundydroog is being mined in large tonnages. Nearly 21000 tons per month are milled and the ore as an average carried a gold content of 5.6 dwt/ton gold. Since the ore body is highly mineralised, several metallurgical problems, such as greater wear and tear of machineries, difficulties during cyanidation due to the presence of sulphides, increased consumption of chemicals and higher tailing values are experienced at Kola

Concentration of Indian Chrome Ores by Ore-dressing Methods

Low-grade chrome ores (roughly classified :simple, ferru-giuous, chrome spinel) from different parts of India were subjected to beneficiation studies at National Metall-urgical Laboratory, to determine their amenability to concentration by ore-dressing methods. Simple ores could easily by concentrated by common gravity methods like tabling and Humphrey's spiral, but the chromium/iron ratio in most cases was low due to iron being present in chemi-cal combination in the mineral chromite. Ferruginous ores were subjected to reduction roast and magnestic separat-ion, and high-grade concentrated low in iron-ideal for ferro-chrome, could be produced. Chrome spinels could not be beneficiated to any appreciable extent

Importance of Microscopic Studies in Mineral Dressing

The importance of microscopic studies in mineral dressing is emphasised with illustrations based mostly on the studies conducted by the authors on Indian samples The information obtainable includes (i) identity of minerals, (ii) grain size, nature and degree of intergrowth of minerals, (iii) quantitative data on the mineralogical constituents, and (iv) genesis and other data of special significance

Sintering of Iron Ore Fines, and Raw Materials for Bhilai Steel Plant

A detailed study has been made at the National Metall-urgical Laboratory on the sintering charactersitics of the iron-ores of Rajharapahar. Madhya Pradesh, and other raw materials likely to be used in the Bhilai steel plant. The effects of variables such as coke and moisture contents in sinter mix, basicity and raw material proportions, on the sintering time and their effects on the quality of sinter produced, have been studied with a sintering plant desig-ned and fabricated at the Laboratory. Optimum conditions for producing the best sinter have been determined. Results of the tests on the Bhilai sample show that coke has a pronounced effect on sinter properties whereas moisture content directly affects permeability and sint-ering rate. 6.1% by weight of coke was found to be the optimum quantity for producing a good sinter. The optimum water content in the charge for producing the most per-meable bed was 7%. The basicity for producing a good self-fluxing sinter in the shortest time was 0.

Benefication, sintering and processing of raw materials for the iron and steel industry

Beneficiation of iron ores relates not only to enrichment of the metal content but also to improvements in physical characteristics of the ore charged into the blast-furnace. The latter is achieved by crushing, sizing and agglo-meration of resultant fines etc. It is universally reco-ginzed that preparation of sized iron-ore burden and use of fluxed sinter in iron production can achieve (i) redu-ction in coke rate by reducing the metallurgical load on the blast-furnace by better utilization of available heat and (ii) increased productivity