Precautions when using porcelain crucibles, what should I pay attention to during the use of crucibl

Precautions

1. In order to avoid unnecessary damage, first of all, it should be handled gently during the handling process to prevent falling and shaking.

2. It should be stored in a dry and ventilated place or placed on a wooden frame to avoid affecting the crucible due to the humidity of the environment.

Performance. 3. Before use, the temperature of the crucible should gradually rise to 500 by baking and other methods.

4. When feeding, it should be fed according to the capacity of the crucible, and it should not be added too much, otherwise it may cause the expansion of the crucible and affect the subsequent use.

5. When using, you usually can't put the melted thing too full, so as to prevent the heated object from jumping out and let the air energy.

Free entry and exit to ensure the normal progress of the reaction, but at the same time, when refining the molten metal, it is necessary to reduce the excessive contact between the molten metal and the air to prevent the molten metal from reacting with the air.

6. According to the shape of the crucible, select and adapt the furnace tool and crucible clamp, and when clamping, the middle of the crucible should be clamped to avoid damage to the crucible caused by local hand force.

The raw materials for the production of crucibles can be summarized into three types. One is crystalline natural graphite, the other is plastic refractory clay, and the third is calcined hard kaolin skeleton clinker. In recent years, high-temperature resistant synthetic materials, such as silicon carbide, have begun to be used.

Alumina corundum.

and ferrosilicon as skeleton clinker for crucibles.

When burning, put it on the mud triangle, burn it directly with fire, preheat it with low heat first, and then burn it over a large fire When it is hot, do not touch it with your hands, and do not put it on the table, so as not to burn the table (it should be placed on the asbestos net) When heating, you should use the crucible pliers to take it (when the temperature is high, the crucible pliers need to be preheated) Do not use cold water to cool the hot crucible to avoid bursting.

Crucible. Usage Notes:

1. Place it in a dry place after use, and avoid rainwater intrusion; Bake slowly to 500 degrees Celsius before use.

before use. 2. The crucible should be fed according to the capacity of the crucible, and it should not be squeezed too tightly, so as to avoid the thermal expansion and expansion of the metal crucible.

3. When taking out the molten metal liquid, scoop it out with a spoon, try to use less calipers, if you use calipers and other tools should be consistent with the shape of the crucible, so as to avoid excessive local force and shorten the use of life.

4. The service life of the crucible is related to the usage, and the strong oxidation flame should be avoided from being directly sprayed on the crucible, so that the oxidation of the crucible raw materials is short-lived. Graphite crucible, because of the above excellent properties, is widely used in the smelting of alloy tool steel and the smelting of non-ferrous metals and their alloys in metallurgy, casting, machinery, chemical and other industrial bright oak departments. And it has a good technical and economic effect.

1.When the electric furnace is used for the first time or after a long period of non-use, the oven must be dried: according to the controller manual, the electric furnace should be adjusted to the standard power for use, and the furnace should be dried before use after the first use or long-term non-use, so as to avoid the furnace and the door from expanding and shrinking too much and rupture.

2.The internal wheel of the thermostat should be twisted to avoid bad contact damage to electrical components, regularly check the firmness of each binding post, and keep the inside of the furnace clean before and after each use, which can also prolong the life of the crucible furnace to a certain extent. 3.

In the process of using Lashen, it is necessary to ensure that there is no conductive dust, ** gas and corrosive gas that can seriously damage the metal and insulation, put an end to damp, flammable and explosive materials placed in the furnace for baking, and the thermostat should be kept 30cm away from the furnace body as far as possible, and the heated materials should be handled gently to prevent friction damage to the furnace.

Crucible Usage:

Ceramic containers containing solid, heat-resistant properties.

How to use: The crucible is a bowl-shaped container with a deep ceramic bottom. When there are solids to be heated over high fire, a crucible must be used. Because it can withstand high temperatures better than glassware.

Crucibles are usually used with crucible lids placed diagonally on the crucible to prevent heated objects from jumping out and to allow air to enter and exit freely for possible oxidation reactions. Because of its small bottom, the crucible generally needs to be placed on a mud triangle before it can be heated directly by fire. The crucible can be placed upright or obliquely on the mud triangle, and can be placed by itself according to the needs of the experiment.

Do not place the crucible on a cold metal table immediately after strong heat to prevent it from breaking due to the cold. It should not be placed on the wooden table immediately to avoid burning the table top or causing disasters. The correct way to do this is to leave it on a mud tripod to cool naturally, or to place it on a stone mesh to let it cool slowly.

Please use crucible pliers for the use of crucibles.

Main uses: 1) Evaporation, concentration or crystallization of solutions.

2) Burning solid matter.

Precautions for use:

1) Both instruments can be directly heated, and can not be quenched after heating, and they can be removed with crucible pliers (2) The crucible is placed on the mud tripod when heated.

3) When evaporating, stir and use waste heat to evaporate.

Uses: 1) Burning solid substances.

2) Evaporation, concentration or crystallization of the solution (if there is an evaporation dish.

An evaporation dish should be chosen. Crucible, of course.

It can also be used for evaporation, concentration or crystallization of solutions).

Precautions for use:

1) It can be directly heated, and can not be quenched after heating, and can be removed with crucible pliers.

2) Place the crucible on the mud triangle when heated.

3) Stir when evaporating; When it is almost dry, it is steamed with residual heat.

Crucibles can be divided into three categories: graphite crucibles, clay crucibles, and metal crucibles.

1. When burning, put it on the mud triangle, burn it directly with fire, preheat it with low heat first, and then burn it with a large fire 2. When it is hot, do not touch it with your hands, and do not put it on the table, so as not to burn the desktop (it should be placed on the asbestos net).

3. When heating, use crucible pliers to take it (when the temperature is high, the crucible pliers need to be preheated) 4. Do not use cold water to cool the hot crucible to avoid bursting.