Stone crushing industry is an important industrial sector in the country engaged in producing crushed stone of various sizes depending upon the requirement which acts as raw material for various construction activities such as construction of roads, highways, bridges, buildings, canals etc. It is estimated that there are over 12,000 stone crusher units in India. The number is expected to grow further keeping in view the future plans for development of infrastructure of roads, canals and buildings that are required for overall development of the country.
In India, the stone crushing industry sector is estimated to have an annual turnover of around Rs. 5000 crore (equivalent to over US$ 1 billion) and is therefore an economically important sector. The sector is estimated to be providing direct employment to over 500,000 people engaged in various activities such as mining, crushing plant, transportation of mined stones and crushed products etc. Most of these personnel are from rural and economically backward areas where employment opportunities are limited and therefore it carries greater significance in terms of social importance in rural areas. It is a source of earning for uneducated poor unskilled rural people.
Stone crushing process involves multiple stages including crushing, screening and conveying. The large stones are first broken down into smaller pieces using a primary crusher, which is typically a jaw crusher. The crushed stones are then transferred to a secondary crusher for further breakage. The final product is obtained by screening and grading of the crushed stones, which is done using various types of screens. The oversize stones are returned back to the secondary crusher for further crushing. The crushed stones are conveyed to vibratory screens which separate the stones into different sizes. The final crushed stone is conveyed to different storage piles or is loaded directly into trucks for transportation to construction sites or to other processing facilities.
Overall, the stone crushing industry in India plays a crucial role in the overall development of the country by providing raw material for various construction activities. It also contributes significantly to the employment and income generation opportunities in rural areas.
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