Complete range of Crushing, Screening & Conveying Equipemnts from Nawa

Nawa Engg to Project Comprehensive Know How at IMME-2008
Nawa Engg to Project Comprehensive Know How at IMME-2008
"In IMME–Kolkata, we intend to exhibit our comprehensive know-how in washing, screening, and classification equipment, as applicable to mining industry. All NAWA crushers are designed with roller bearings to save operating cost in terms of energy and long life," says Mr. G. N. Raju, Managing Director, Nawa Engineers & Consultants Pvt. Ltd., in his Interview with P.P.Basistha.

What is the size of crushers market in India in terms of value and units? Has this increased over years?
Mining Sector
This has to be related to growth in the annual mining targets of metallic & non-metallic minerals and solid-fuel minerals, like iron ore, bauxite, manganese ore, chromites, copper ore, limestone, coal, lignite, atomic minerals and other minor minerals. All these ores as they are mined or quarried would need mechanical processing in primary/secondary/tertiary crushers (and some cases grinding in grinding mills), and size classification of crushed materials in mechanical vibrating screens.

The kinds of crushing needs are so varied for different mineral ores, both in application and capacity-wise starting from a small lime quarry with a 5 TPH jaw crusher to an opencast mine having a 3000 TPH impact crusher for coal. As such, the market requirements can be gauged from the investments expected in mining sector.

With surge in the demand for metals in response to strong economic growth, an annual increase of 10% to 20% took place in the tenth five year plan, and the total value of annual mineral production (fuel minerals and metallic & non-metallic minerals) is in the order of Rs 800,000 million in the penultimate year, which translates to 320 million tons of mineral ores produced in 2006-07. It is estimated an 80% increase in the total production in the eleventh five year plan, which would be about 240 million tons of additional minerals to be processed during 2007-12.

This would generate a market for the crushing and screening equipment of value to the tune of Rs 560,000 million during the next five years from the mineral sector alone.

Construction Sector
Nawa Engg to Project Comprehensive Know How at IMME-2008
Infrastructure development in India has given a big boost to quarry industry in the last ten years to crush hard stones like granites, quartzite, basalts, river gravel, etc to meet the increasing demand for aggregates by the construction industry. The estimated investment in the new road network, seaports, airports, housing, dams, railways and others would be to the tune of Rs 900,000 crores by the private and public sector in the eleventh five year plan. This is the sector with a big potential for crushing and screening equipment from indigenous SMEs and foreign companies.

The aggregates industry would be looking for crushing and screening equipment worth about Rs 450,000 million in the next five years to cope up with the proposed infrastructure development in the country.

What have been the newer modifications you have carried out in the features of your crushers for cutting operating costs and high productivity?
All NAWA crushers are designed with roller bearings to save operating costs in terms of energy and long life. For example, our roller bearing cone and jaw crushers are recognized to be one of the best set of machines for hard stone crushing. They have been successfully demonstrated for the lowest operating costs per ton crushing of comparable models of others.

How far your machines are customized to perform in Indian mining conditions?
All NAWA equipment are designed to suit harsh conditions of mining and quarry environment compared to industrially advanced countries. The heat & dust and relatively lower attention to the maintenance cause encountered in our mining areas leads to higher breakdown times and reduce the life of the equipment on the whole. All our equipment are sturdily designed and a great care is taken in selection of proper metallurgy of all the parts.

What has been the newer modifications made in your machines for easier maintenance?
All our equipment are designed for easy access to remove and fit the regular wear-parts. The crusher stations are provided with maintenance hoists for easy lifting of heavy parts during maintenance. All auxiliary systems like hydraulics, lubrication etc are automated for safety as well as easier maintenance.

Nawa Engg to Project Comprehensive Know How at IMME-2008

Are there any plans for introducing new range of machines? When this is likely to be, and kindly give the details.
We have introduced in EXCON 2007, our state-of-the-art all mobile stations for processing plus 300 TPH crushing and screening systems for mineral processing and aggregate production. With this, NAWA made a distinction of having introduced first time in India tyre-mounted all mobile plants exceeding 300 TPH crushing capacities.

In IMME–Kolkata, we intend to exhibit our comprehensive know-how in washing, screening and classification equipment, as applicable to mining industry, which is the most important process task in any ore processing industry. The quality of the end products depends on the type of screening equipment deployed, its efficiency, and separation of finer materials by hydraulic classifiers where mechanical screening becomes no more effective.

We will be displaying –

1) Linear Vibratory Screen
Linear viberation is imparted by two vibatory mechanism strategically placed for achieving higher efficiency of finer and wet material screening

Linear vibratory screens work with horizontal or at slight inclination of screening decks, which makes them separate to accurate material separation. They are used for the following applications:
  • for fine, medium and coarse screening of sand, aggregates, ores etc
  • for dry and wet screening of difficult to screen materials
  • for de-watering or drying process
  • for angular, cubic, or flaky materials
2) Screw Classifier
Screw classifier is an important piece of equipment in the benefit of mineral ores and sand washing. It is multi-functional equipment and does washing, classifying and dewatering, all simultaneously. The screening, also known as classification, is accomplished by water turbulence by a rotating spiral screw. The settled material is raked-up, de-watered and discharged up an inclined tub. The most important applications are recovery of mineral fines from slimes and sand washing.
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