Low grade dumped limestone sample having high silica of 8.1%, 36.8% CaO, and 3% Al₂O₃ has been studied with the aim to reduce the silica level to below 3% for its utilization in iron making. Beneficiation study of the sample was initiated with desliming of the feed sample of −100 µm to remove the siliceous ultrafine particles and to improve the feed quality. Flotation study was carried out by column flotation technique varying the collector dosage, superficial air flow velocity and froth depth to assess their effect on silica reduction and CaO recovery. It was observed that increased collector dosage and superficial air velocity increases the recovery of CaO, and increase in the froth depth reduces the mass flow and silica content in the concentrate. The best result was found at 1.25 cm/sec superficial air velocity, 25 cm froth depth, 1.25 kgpt collector dosage and concentrate assayed 47.3% CaO, 2.8% silica with 72% CaO recovery.

具有8.1％，36.8％CaO和3％Al ₂ O _3的高二氧化硅的低品位废石灰石样品为了将二氧化硅在炼铁中的利用降低到更低的水平，已经进行了研究。样品的选矿研究始于对-100 µm的饲料样品进行脱泥，以去除硅质超细颗粒并改善饲料质量。通过柱浮选技术进行浮选研究，改变收集器的用量，表面空气流速和泡沫深度，以评估它们对二氧化硅还原和CaO回收率的影响。观察到增加捕收剂的用量和表观空气速度会提高CaO的回收率，而泡沫深度的增加会降低精矿中的质量流量和二氧化硅含量。最佳结果是在1.25 cm / sec的表观空气速度，25 cm的泡沫深度，1.25 kgpt的捕收剂剂量下进行的，浓缩物的含量为47.3％CaO，2.8％二氧化硅和72％CaO回收率。