Test Report: Remove Fe & Ti in Coal-series Kaolin

Test Report: Remove Fe & Ti in Coal-series Kaolin

The sample is coal-series kaolin from Xiangtan, black powder blocks, with small stones and other impurities in it. Purpose of the test is to remove Fe and Ti in it. Coal-series kaolin mainly existed in the top/bottom/interlayer of coal layers of coal-series stratum formed in the Permian of carbon and the coal series of Carboniferous, Triassic, Jurassic and Tertiary, with hard texture. Crystalloids are compact microcrystal, mostly plate-shaped, smaller than that of non-coal-based kaolin; darker, generally containing organic carbon, and natural whiteness is usually 20 to 50 degree. There are black, gray black, gray, brown, gray green, gray white and other different colors, with high iron and titanium content. In kaolin ores, in addition to kaolin, there are often quartz, feldspar, boehmite, pyrite and anatase, with a small amount of marcasite, magnetite, limonite, hematite, ilmenite, rutile, zircon, tourmaline and water mica, etc. The Al2O3 in coal-based kaolin is much higher than soft soil, which is between 35% and 39%. To remove Fe & Ti in Kaolin 1. Reverse Flotation Test See the following test flow. After initial grinding, dispersing agents, kaolin inhibitors, activator vector to activate iron and titanium for flotation are added in the slurry, and finally collector is added for reverse flotation. Flotation test results are shown in Table 1. Reverse Flotation Test for Kaolin Test Result of Reverse flotation test for Kaolin Yield (%) Grade (%) Recovery (%) Fe Ti Fe Ti Concentrates 58.4 0.65 0.71 32.79 25.71 Tailings 41.6 1.87 2.88 67.21 74.29 Run-of-mine 100 1.16 1.61 100 100 We can see from the Table 1 that Fe and Ti can’t be lowered below 0.5% simply by reverse flotation. Wet high gradient high intensity magnetic separation is considered before reverse flotation. 2. High Gradient High Intensity Magnetic Separation – Reverse Flotation Test High gradient high intensity magnetic separation is added in the flow sheet to reduce some parts of Fe and Ti. Result is shown in Table 2. Yield (%) Grade (%) Recovery (%) Fe Ti Fe Ti Concentrates 55.3 0.48 0.61 21.41 20.26 Tailings 44.7 2.18 2.97 78.59 79.74 Run-of-mine 100 1.24 1.66 100 100 3. Further test is recommended Conditions of flotation Optimize the grinding size, dispersing agent, activator, collector, etc, to find the most suitable flotation conditions. Conditions of magnetic separation Optimize the magnetic intensity of high intensity magnetic separation, and the test result of magnetic separation with flocculant.