HDO has an excellent track record in Mineral Beneficiation, which is one of its core business sector. HDO enjoys leadership in more than 70 different metallic and non-metallic mineral processing industries. With its time tested and proven solid-liquid separation technologies, HDO has made major contributions in processing of Alumina, Iron-ore, Uranium, Coal, Copper, Lead, Zinc, Chrome, etc. In-depth knowledge of mineral processing techniques, reliable field experience gained through more than four decades of operation and whole range of specialized equipment, makes HDO a consistent performer in Mineral Industry.

HDO has served almost all the customers in Alumina Industry, viz. NALCO, HINDALCO, BALCO, INDAL, MALCO and VEDANTA, by supplying its core process units, such as Sand Washing Plant, Conventional Thickeners, Hi-rate Settlers, Cable Torque Thickeners, Kelly Filters, Disc Filters, Red Mud Filters, Horizontal Pan Filters, Milk of Lime Plants, etc.

HDO has completed one of its major prestigious EPC Contract of value Rs.150 crores for India's largest Greenfield Alumina Refinery of 1.4 MTPA capacity being put up by M/s. Vedanta Alumina Ltd. at Lanjigarh, Orissa. The project included Settler and Washer, Milk of Lime and Hydrate Seed Thickener Package on turnkey basis, involving complete design, detail engineering, procurement, fabrication, construction, supply, erection and commissioning of the complete Plant. For the first time in India, HDO has used Hi-Rate Settler technology for Alumina Refinery, which uses new design Settler / Washers to provide better overflow clarity and improved underflow consistency. Reversion losses are also less in the new technology used for the refinery. The Milk of Lime Plant supplied is also the biggest fully automatic Plant having processing capacity of 20 TPH.

HDO has made a major contribution in the field of Uranium Ore Processing and Extraction Plants in India, and has supplied equipment and system to Uranium Corporation of India Ltd., for their Jaduguda Project.

HDO has completed a prestigious Greenfield Project of 3000 TPD capacity for Uranium Corporation of India Ltd. at Turramdih, Jharkhand worth Rs.35 crores. The Project included complete process engineering and also supply of major equipment like Filters, Thickeners, Flocculent Dosing System, etc .

HDO has executed Chrome Ore Beneficiation Plant on turnkey basis for Orissa Mining Corporation for their Greenfield Project at Kaliapani. Apart from the above plants, HDO has also been associated with all the Coal Washery Projects for TISCO, JINDAL, Steel & Power Ltd., Central Coal Fields Ltd., Coal India Ltd., Western Coalfields Ltd., by way of supplying major equipment like Thickeners, Floatation Cells, Disc Filters, Drum Filters and Slurry Pumps and also complete system.

HDO has supplied equipment and system related with Solid-Liquid Separation to various Iron Ore Processing Plants like NMDC, KIOCL, TISCO, SESA Goa, ESSAR.