Sodium salt sintering roasting is to add sodium salt, such as carbonate, salt, sodium, sodium sulfate, etc. in the calcination of mineral raw materials, to transform the insoluble target components in mineral raw materials under certain temperature and atmosphere conditions. The process of change for the corresponding sodium salt of solubility. The obtained calcine (sintered block) can be leached with water, dilute acid or dilute alkali, and the target component is converted into a solution, so that the target component can be separated and enriched.
Sodium salt sintering roasting can be used to extract useful components and also to remove certain impurities from refractory coarse concentrates. Sodium salt commonly used in industry for extracting useful components tungsten, vanadium, main reaction process sodium roasting refractory low-grade tungsten mineral raw materials, potassium, vanadium, uranium and other hard mineral feedstock is:
1 700~850 °C
Tungsten iron ore 2FeWO 4 + 2Na 2 CO 3 + --O 2 ----- → 2Na 2 WO 4 + Fe 2 O 3 + 2CO 2 ↑
2
1 700~850 °C
Wolframite ore 3MnWO 4 + 3Na 2 CO 3 + --O 2 ----- → 3Na 2 WO 4 + Mn 3 O 4 + 3CO 2 ↑
2
1 700~850 °C
2MnWO 4 +2Na 2 CO 3 + ——O 2 —————→ 2Na 2 WO 4 +Mn 2 O 3 +2CO 2 ↑
2
860 °C
Scheelite CaWO 4 +Na 2 CO 3 +SiO 2 ——→ CaSiO 3 +Na 2 WO 4 +CO 2 ↑
100~180 °C
Potassium vanadium uranium ore K 2 O·2UO 3 ·V 2 O 5 +6Na 2 CO 3 +2H 2 O————→2Na 4 [UO 2 (CO 3 ) 3 ]+2KVO 3 +4NaOH
V 2 O 5 +Na 2 CO 3 —→2NaVO 3 +CO 2 ↑
SiO 2 +Na 2 CO 3 —→Na 2 SiO 3 +CO 2 ↑
Sodium roasting is higher than the normal calcination temperature, which is close to the softening point of the material, but still below the melting point of the material. At this time, the flux melts to form a part of the liquid phase, so that the reaction reagent is better contacted with the charge, which can increase the reaction rate. Therefore, the purpose of this operation is not to sinter, but to convert the poorly soluble target component mineral into the corresponding soluble sodium salt, and the agglomerate can be directly sent to water for leaching or cooling to be leached.
In addition to extracting certain useful components, this process is often used to remove certain impurities from difficult crude concentrates to improve concentrate quality. For example, it is used to remove impurities such as phosphorus , aluminum , silicon, vanadium, iron- copper and the like in coarse concentrates such as manganese concentrate, iron concentrate, graphite concentrate, diamond concentrate and kaolin concentrate.
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