A kind of alkali leaching desilication method of manganese ore
An alkali leaching and desiliconization technology, which is applied in the direction of alkali metal silicates, chemical instruments and methods, silicates, etc., can solve the problems of manganese recovery rate and low concentrate grade, so as to improve the total leaching rate and reduce alkali Consumption, increase the effect of additional profits
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Embodiment 1
[0026] The pyrolusite from a manganese mining area in Guizhou, the chemical multi-element analysis is as follows:
[0027]
[0028] The useful minerals are mainly pyrolusite, and quartz is the main gangue mineral.
[0029] Weigh a certain amount of ore sample broken to -2mm, grind it to -200 mesh to account for 75%, and then mix it with lye with a mass fraction of NaOH of 10% at a liquid-solid ratio of 2.5:1 (amount of substance: n SiO2 :n NaOH =1.6:1) mix evenly, add to the autoclave and react for 4h under the conditions of 180°C and 300r / min, filter, collect the filtrate, mix the filter residue and lye with a mass fraction of NaOH of 60% according to the alkali-mineral ratio of 4:1 and add the resistance React in the furnace at 180°C, 80r / min for 3h, and filter.
[0030] The Mn grade of the obtained pyrolusite concentrate is 46%, the water glass modulus in the high-pressure alkali leaching solution is 2.3, and SiO is leached in two stages 2 The total removal rate reach...
Embodiment 2
[0032] Taken from a pyrolusite in Hunan, its main chemical composition is as follows:
[0033]
[0034] The main metal minerals are pyrolusite and hematite, and quartz is the main gangue mineral with low manganese content.
[0035] Take a certain amount of ore sample and grind it to -200 mesh to account for 80%, and then press the liquid-solid ratio 2.5:1 with the lye of NaOH mass fraction 8% (the amount of substance: n SiO2 :n NaOH =2:1) Mix evenly, add to the autoclave and react for 4h under the conditions of 160°C and 350r / min, filter, collect the filtrate, filter residue and lye with a mass fraction of NaOH of 60%, mix evenly according to the alkali-mineral ratio of 4:1, add resistance React in the furnace at 240°C, 80r / min for 3h, and filter.
[0036] The Mn grade of the obtained pyrolusite concentrate is 33%, the water glass modulus in the high-pressure alkali leaching solution is 2.1, and SiO is leached in two stages 2 The total removal rate reaches 95%, and the...
Embodiment 3
[0038] Rhodochrosite taken from a manganese mining area in Hebei, the chemical multi-element analysis is as follows:
[0039]
[0040] The main metal minerals are rhodochrosite and hematite, and the gangue minerals are quartz and kaolinite.
[0041] Get a certain amount of ore sample and grind it to -200 mesh to account for 85%, and then mix it with lye with a mass fraction of NaOH of 3% at a liquid-solid ratio of 2.5:1 (amount of substance: n SiO2 :n NaOH =4:1) Mix evenly, add to the autoclave and react for 5h under the conditions of 220°C and 500r / min, filter, collect the filtrate, mix the filter residue with the lye with a mass fraction of 80% NaOH according to the alkali-mineral ratio of 4:1 and add the resistance React in the furnace at 200°C, 80r / min for 4h, and filter.
[0042] The Mn grade of the obtained rhodochrosite concentrate is 25%, the water glass modulus in the high-pressure alkali leaching solution is 2.2, and SiO is leached in two stages 2 The total rem...
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