GB/T 3044-2020Chemical analysis methods for white fused alumina and pink fused alumina (English PDF)

3.1 Crystal block sample

Take a statistically representative crystal block, crush it to completely pass through a screen with a basic mesh size of 2mm, and use a magnet (each magnetic pole The magnetic flux is 3.5 x 10^-2mWb~4.5 x 10^-2mWb, the difference between the magnetic flux of the two magnetic poles is not more than 0.3 x 10^-2mWb) Suction and remove the powder Iron brought in from the broken pieces. Mix evenly and reduce to 10g~20g by quarter method. Continue to grind with a corundum mortar until all of it passes through the mesh Screen with a size of 106 µm. Mix well, put it into the sample bag, dry it in an oven at 105°C~110°C for 1h, take it out, and put it in a desiccator Medium, cool for later use.

3.2 Abrasive samples

Sampling and reduction are carried out in accordance with GB/T 4676.

Abrasives with a particle size greater than 106µm are first reduced to 10g~20g, and then finely ground with a corundum mortar until the basic size of the mesh is 106µm.

Mix the sieve evenly, put it into the sample bag, dry it in an oven at 105°C~110°C for 1h, take it out, put it in a desiccator, and cool it for later use.

Abrasives with a particle size of not more than 106µm are reduced to 10g~20g, put into a sample bag, and dried in an oven at 105°C~110°C for 1h.

Take it out, put it in a desiccator, and cool it for later use.

4.1 Analysis steps

Weigh about 1g of the sample, accurate to 0.0001g, and put it into a platinum crucible previously burned to a constant weight in a high-temperature furnace at 1100°C, and write down the crucible Add the mass of the sample, slightly lift the lid, place it in a high temperature furnace at 1100°C and burn it for 1 hour, take it out, cool it in a desiccator, weigh it, and burn it repeatedly to Constant weight, the holding time for repeated burning is 20min.

4.2 Calculation of analysis results

The mass fraction w(A) of burning loss, expressed in %, is calculated according to formula (1).