Hydrothermal synthesis digestion tankThe removal of residues is a crucial step, and here are some effective removal techniques:

　　1、 Conventional cleaning methods

1. Prepare tools and materials:

clear water

Gentle detergent

Sponge or degreased cotton

rag

2. Cleaning steps:

Pour out the residue in the digestion tank and rinse it with clean water initially.

Add an appropriate amount of mild detergent and gently wipe the inner wall with a sponge or degreasing cotton. Be careful not to use a hard brush or steel wire ball to avoid scratching the inner wall of the digestion tank or damaging the sealing performance.

Rinse thoroughly with clean water to ensure there is no residue of detergent.

Wipe dry with a clean cloth and place in a cool and ventilated place to air dry.

　　2、 Special methods for removing difficult residues

1. Use solvents:

If there are some organic substances in the residue that are difficult to clean with cleaning solution, solvents such as acetone and xylene can be considered.

When using such solvents, ensure thorough rinsing to remove all residual solvents.

2. Nitric acid immersion:

Before conducting trace analysis, the digestion tank needs to be soaked in a 10% nitric acid tank for at least 24 hours to remove residues.

　　3、 Advanced cleaning methods (such as using special cleaning solutions and heating and pressurization)

1. Selection of cleaning solution:

A mixture of nitric acid and hydrogen peroxide can be considered as a cleaning solution, which has strong oxidizing and reducing properties and good removal effect on heavy metal residues.

2. Heating and pressure cleaning:

Add the cleaning solution into the digestion tank and tighten the outer tank.

The method of high temperature and pressure can be used, for example, placing the outer tank in an oven and heating it to a certain temperature and then applying pressure to bake for a period of time.

Alternatively, the outer tank can be placed in a microwave digestion apparatus for programmed temperature cleaning.

3. Post cleaning treatment:

After cleaning, cool the digestion tank and pour out the cleaning solution.

Rinse thoroughly with clean water and deionized water again.

Dry the digestion tank to ensure internal dryness.

　4、 Precautions

1. Regular cleaning: The digestion tank should be cleaned regularly to avoid the accumulation of residues that may cause difficulty in cleaning.

2. Cover protection: The cover does not need to be cleaned every time the sample is digested, it can be cleaned once a day.

3. Cleaning of outerwear: Do not use any reagents to clean the outerwear. If there are any dirt or acid droplets, wipe them clean with a damp cloth.

4. Safe operation: During the cleaning process, attention should be paid to personal protection and safe operation to avoid the cleaning agent splashing onto the skin or eyes.

The removal of residues from hydrothermal synthesis digestion tanks requires the selection of appropriate cleaning methods and materials based on the actual situation. Conventional cleaning methods are suitable for most situations, while special or advanced cleaning methods are required for residues that are difficult to remove. During the cleaning process, attention should be paid to protecting the integrity and safety of the digestion tank.