Introduction of the pseudo-floating method of spodumene

Instead two kinds spodumene flotation process: flotation and reverse flotation

The positive flotation process is the process of preferential flotation of spodumene: the essence is: grinding fine ore in alkaline medium formed by sodium hydroxide or sodium carbonate, high concentration, strong agitation and multiple washing and de-muding, adding The fatty acid or its soap is used as a collector to directly float the spodumene.

The Soviet Union Mineral Processing Research Institute has conducted a beneficiation study on the Zaviqin deposit, which is a pegmatite deposit. The sample is taken from the coarse-grained zone and partially weathered. The spodumene grains are mostly 10-15 mm. The proposed process developed by the institute is a positive flotation process. According to this process, the mine can obtain a spodumene concentrate with a grade of more than 5% Li2O, and the recovery rate is 70-75%.

As early as 1960, when the beneficiation study was carried out on the pegmatite spodumene ore in Xinjiang, China's ore dressing workers first invented and formulated a simplified process for the alkaline flotation process without sludge removal and non-washing. The process was used in production in 1961. The industrial production index is: 1.3 to 2% Li2O in the ore, and the diaspora concentrate grade is 4 to 5% Li2O, and the recovery rate is 85 to 90%.

The reverse flotation process is to inhibit the spodumene in a lime-adjusted alkaline medium with dextrin and starch as a regulator, and use a cationic collector to float the silicate-like gangue mineral as a foam. The product in the tank is The spodumene concentrate, the reverse flotation process recommended by Denver.

In the 1950s and 1960s, the United States adopted a reverse flotation process. Currently, both the US and China's spodumene flotation plants use a positive flotation process.

The following steps describe the separation of spodumene and beryl

In the granitic pegmatite deposit, spodumene and beryl are often associated with each other. Their separation was once regarded as one of the problems of lithium niobium ore dressing. It has been extensively studied at home and abroad. In the early 1960s, China’s mineral processing workers formulated The following three lithium bismuth separation processes are available:

1. Prefer partial flotation of lithium, then separate and separate lithium

Using NaF and Na2CO3 as adjusting agents, flotation of some spodumene with fatty acid soap, then adding NaOH and Ca2+, mixing floatation spodumene-beryl with fatty acid soap, and finally using sphalelite-beryl foam product with Na2CO3 After NaOHT and acid and alkaline water glass were heated, the beryl was separated by flotation. The process was directly transferred to production after the semi-industrial test in 1965.

2, priority to choose beryl, and then spodumene

First select the easy-floating minerals, then in the Na2CO3, Na2S and NaOH high alkali medium, the spodumene is under the restrained condition, and the beryl is preferentially floated with the fatty acid soap. After the beryl flotation tailings are activated by NaOH, the fatty acid soap is added to float the spodumene. The principle flow is shown in Figure 5. This process was used as the No. 1 series production process when the Cocoto Sea Concentrator was later designed.

3. Priority selection of spodumene, then beryl

In the low alkali medium in which Na2CO3 alkali lignin (dissolved with alkali to dissolve lignosulfonate) for a long time, beryl and gangue minerals are inhibited, and spodumene is floated with oxidized paraffin soap, naphthenic acid soap and diesel oil. Thereafter, NaOH, Na2S and FeCl3 were added to activate the beryl and inhibit the gangue minerals, and the beryl was floated with oxidized paraffin soap and diesel.

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