Data Sheet Download
Process Flow
Conversion Roasting:
Lithium mica crushing, ball milling and sieve to <178μm, and mixed evenly to get the primary ore powder; lithium pyroxene concentrate from the concentrate storehouse manually sent to the bucket elevator to elevate to the concentrate silo, and then through the disc feeder and spiral feeder to join the end of the lithium carbonate rotary kiln, the use of kiln preheating section of the high-temperature gas drying concentrates, lithium carbonate rotary kiln with a certain degree of inclination, along with the kiln's non-stop rotation, the material by the high end of the low end of the slowly Advance. Natural gas is injected into the kiln from the kiln head, and burned in the lithium carbonate rotary kiln, the heat is absorbed by the material, and the concentrate is converted into crystal type under the temperature of about 1200℃ in the calcining section, and converted from α-type (monoclinic crystal system, with density of 3150kg/m3) to β-type lithium feldspar (tetragonal crystal system, with density of 2400kg/m3, i.e. baking material), with the conversion rate of 98%, and then discharged from the lower end of the cylinder of the lithium carbonate rotary kiln. Out.
Acidizing roasting:
Baking material cooled down by the cooler from the kiln head discharge, after natural cooling, the use of ball mill grinding to 0.074mm (particle size of more than 90%), transported to the acid roasting kiln tailings bin, and then through the feeder and screw conveyor to join the acid mixer with concentrated sulfuric acid (93% or more) according to a certain ratio (concentrated sulfuric acid according to the baking material in the lithium equivalent of 35% of the excess calculation, each ton of baking material requires concentrated sulfuric acid of about 0.21t) mixing Uniformly, added to the acidification roasting room, at a temperature of 250 ~ 300 ℃ for closed acidification roasting 30 ~ 60min, β-type lithium pyroxene in the baking material with the reaction of sulfuric acid, hydrogen ions in the acid to replace β-type lithium pyroxene lithium ions, so that the Li2O and SO42- combination of water-soluble Li2SO4, to get the acidified clinker. Then, through a series of separation, removal of impurities and other processes, lithium carbonate is obtained.
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