![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
Beryl and spodumene are aluminosilicate minerals, often in the same symbiotic pegmatite deposits; because they are non-magnetic mineral, and relatively close to the density, similar to the relative density and gangue minerals. Therefore, it is difficult to separate beryl and spodumene by magnetic separation and re-election methods, and only by flotation separation method. On the other hand, due to the similarity of buoyancy, hornblende, tourmaline , biotite and muscovite with beryl and spodumene, it is difficult to enrich and separate beryl and spodumene. .
The flotation separation of beryl and spodumene generally has mixed flotation and preferential flotation (priority flotation beryl, re-selected spodumene, preferential flotation spodumene, re-selected beryl, or preferential flotation of lithium The two principle processes of pyroxene and then lithium lanthanum are mixed and separated, and the cation collector and the anion collector can be used for flotation.
(1) Priority flotation
When a cationic collector is used, the silicate mineral has a relatively good floatability, so when adjusting the beryl and spodumene, it is necessary to add a modifier.
1 preferential flotation of spodumene, re-selected beryl (first inhibition of beryl, preferential flotation of spodumene, and then activation of beryl and flotation) When preferential flotation of spodumene, mainly using sodium fluoride and wood The sulfonate inhibits beryl and gangue; the lignosulfonate forms a hydrophilic film on the surface of the beryl and gangue minerals, thereby preventing the attachment and adsorption of the collector (such as oleic acid) on its surface. However, the effect of lignosulfonate on spodumene mineral particles is relatively small, so that preferential flotation of spodumene can be ensured.
For example, in a low-alkali medium, sodium carbonate alkali lignin (solubilized with alkali to dissolve lignosulfonate) is added to the ball mill for a long time, at which time beryl and gangue minerals are inhibited, using oxidized paraffin soap, naphthenic Acid soap and diesel flotation spodumene. The flotation tailings sodium hydroxide, sodium sulfide and iron chloride and inhibits activation of gangue beryl, using the same soap and oxidized paraffin diesel flotation beryl.
2 preferential flotation of beryl, re-selected spodumene (first inhibition of spodumene, preferential flotation beryl, re-activated spodumene and flotation) first remove the easy-floating minerals, then in sodium hydroxide, sodium sulfide Inhibition of spodumene in a high alkali medium adjusted with sodium carbonate, flotation of beryl with fatty acids (such as oxidized paraffin soap and diesel); activation of flotation tailings with sodium hydroxide, followed by fatty acids (such as oxidized paraffin soap and diesel) Flotation spodumene.
When using anionic collector, suppression modifier spodumene descending order: sodium fluoride, lignin sulfonates, phosphates, sodium carbonate, sodium fluoride, sodium silicate, starch, these The inhibitor has a great inhibitory effect on beryl. In neutral and weakly alkaline media, a large amount (1 kg/ton or more) of sodium fluoride, lignosulfonate, phosphate, carbonate, etc. has strong The inhibition effect, while a small amount of sodium silicate, starch and the like on the inhibition of beryl is not obvious. In strong alkaline media, the inhibitory effect of these agents is generally weakened, but the inhibition of spodumene is generally enhanced.
3 preferentially flotation part of lithium, then carry out lithium lanthanum mixed separation and then separate sodium fluoride and sodium carbonate as a regulator and add to the ball mill, using fatty acid soap to preferentially float part of spodumene, sodium hydroxide is added to the flotation tailings Activated with calcium ions, and then mixed with flotation of spodumene-beryl with fatty acid soap. The mixed coarse concentrate is treated with sodium carbonate, sodium hydroxide and acid, and alkaline water glass is heated (for example, 85 ° C) to float green. Column concentrate.
(2) Mixed flotation
A flotation tailings containing 0.08% BeO spodumene, stirred at 0.9% kg/ton hydrofluoric acid for 5 minutes (pH=3.8) at 30% solids concentration, and the stirred slurry is washed too much in the spiral classifier. After acid, stir with 0.41 kg/ton of sodium silicate, 0.14 kg/ton of sodium hydroxide and 0.41 kg/ton of oleic acid for 5 minutes at a solid concentration of 30%, and enter the coarse selection tank at Ph=7.3. A rough selection and three selections were made to obtain a concentrate containing 1.25% Be0 and 4.45% Li20, and the recoveries were 89.1% and 65.8%, respectively.
(3) Selective Separation of Lithium and Uplift Concentrates Lithium and tantalum concentrates generally contain mica, feldspar and quartz , and need to be further selected for removal. The removal method is to mix the coarse concentrate with sulfuric acid (for example, about 4.50 kg/ton), wash away the fatty acid, and then stir with about 1 kg/ton of sulfuric acid and 90 g/ton of ammonium acetate. After removal of mica, 94% of the concentrate containing mica can be obtained, and the tailings are further selected by spodumene.
When spodumene is selected, the above tailings are stirred with about 700 g/ton of oleic acid for a rough selection and secondary selection, and a spodumene with a recovery of about 84% and containing 6.6 % Li20 can be obtained. Concentrate, at this time, about 80% of the beryl is suppressed into the tailings, and then the beryl is enriched in the tailings. At this time, 900 g/ton of hydrofluoric acid is used for stirring, and then the excess acid is washed away; after that, 136 g/ton of sodium hydroxide and 218 g/ton of oleic acid are used for slurrying, and beryl is carried out. Flotation, the obtained coarse concentrate is selected twice under the condition of pH=7, and the beryl concentrate containing 6.37 % BeO can be obtained. The recovery rate of the operation is 76%, and the recovery of spodumene flotation tailings is obtained. The rate is 66%.
Automatic Pressure Pump,Force Pressure Control,Pressure Control Switch,Automatic Pressure Control
Ningbo Metal Sharing Supply Chain Management Co., Ltd , https://www.nbsteelsupply.com