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Spodumene is a high-quality mineral source for industrial lithium extraction, and the composition content is LiAl(SiO₃)₂ or Li₂O · Al₂O₃·4SiO_2. Spodumene is divided into three categories according to its use, chemical composition and smelting process requirements: spodumene for chemical use, spodumene for ceramics, and low-iron spodumene.

Spodumene is an industrial source of high-quality lithium extraction, its content is LiAl(SiO₃)₂ or Li₂O·Al₂O₃·4SiO_2. Spodumene is divided into three categories according to its use, chemical composition and smelting process requirements: spodumene for chemical industry, spodumene for ceramics, and low-iron spodumene.

Spodumene is usually produced in granite pegmatites In order to extract, analyze and utilize the lithium element and other chemical components in it, we need to dissolve the lithium element in spodumene in a liquid medium through a microwave digestion process, so as to facilitate subsequent analysis and extraction.

Next, Welso will share in detail the specific process of the experiment of using microwave digestion system to digest spodumene, including the materials and instruments used in the experiment, each step of the experimental procedure, the operating conditions used, and related precautions. Through the description of these details, it can help you better understand the application method of microwave digestion technology in spodumene sample digestion, and provide a reference for similar research.

I Experimental preparation

Sample Name: Spodumene Sample (Figure 1)

Digestion reagents: phosphoric acid AR, sulfuric acid AR, hydrofluoric acid AR

Instrument used: Welso WMD600 Closed Microwave Digestion System

Grey Power Sample before Digestion

II Operation Procedures

1. Weigh 0.2 g of sample (accurate to 0.1 mg), place it in a microwave digestion inner vessel, and add 3 mL of phosphoric acid, 2 mL of sulfuric acid, and 3 mL of hydrofluoric acid (Table 1).

2. Load into the WMD600 microwave digestion instrument and perform microwave digestion according to the method in Table 2.

3. After the digestion is complete and the cooling is over, transfer the digestion tank to the fume hood.

4. Unscrew the outer vessel of the digestion vessel, slowly relieve the pressure in several times, take out and open the inner tank.

5. Observe the digestion status of the sample (Figure 2).

Table 1 Sample weight and volume

Table 2 Digestion procedures for spodumene samples 1 and 2

III Results and discussion of digestion

Figure 2 Samples After Digestion

The results showed that after digestion by Welso WMD600 microwave digestion system, the digestion solution was in a colorless and transparent solution state, and no precipitation was generated. Three digestion reagents were introduced in this digestion, among them, H₃PO₄ is less used in digestion. Phosphoric acid is suitable for the digestion of iron-based alloys that will volatilize some specific trace components when adding Hydrochloric acid. Phosphoric acid can also dissolve chrome ore, iron oxide ore, aluminum slag, etc., which mainly uses the complexation reaction of phosphoric acid and Fe3+; As a non-oxidizing acid, HF is often used to digest minerals, ores, soils, rocks and even silica-containing vegetables, especially the use of H₂SO₄ should be paid attention to in the design of the digestion scheme, and the additional H₂SO₄ and the order of addition in the mixed acid system should be strictly controlled. The design of the spodumene sample and digestion scheme in this experiment is directly related to the stable state of the instrument and control of temperature and pressure.