GB 26447-2010Transport of dangerous goods -- Classification procedures, test methods relating to ammonium nitrate fertilizers capable of self-sustaining decomposition (English PDF)

4.1 Sorted

Test to determine the new products in the local decomposition caused by whether it will be extended to all the material. Recommended test methods, see section 5 of this standard

Zhang, whether a product is ammonium nitrate fertilizer Class 9 substances and articles depends on the test results.

4.2 Packaging division

All articles and 9 species of nitrate fertilizers are classified III packing.

4.3 Exceptions

Ammonium nitrate fertilizer having the composition UN2071 if self-sustaining experiments show that they are not easily decomposed and contained excess nitrate

The mass fraction of less than 10%, can be considered from the UN "Recommendations on the Transport of Dangerous Goods. Model Regulations" constraints.

5.1 Principle

The transportation to be submitted in the form of nitrate fertilizers charged level Mounting wire mesh tank by heating the underlying fertilizer portion initiator Board

solution. After removal of the initiating heat source, measuring the decomposition of fertilizer spread to the whole slot to determine whether a product is capable of self-sustaining decomposition of fertilizers.

5.2 Equipment and Materials

5.2.1 groove wire mesh

1.5mm, wire diameter 1mm square hole wire mesh (recommended stainless steel) mesh made with about an upper opening, the internal dimension

150mm × 150mm × 500mm groove, as shown in FIG. 1, the width of the groove placed 15mm, having a thickness of 2mm steel strip holder

, The ends of the slots are available wire mesh 1.5mm thick stainless steel plate instead of 150mm × 150mm square.

If the particle size of the fertilizer composition of the fertilizer to make the most of the screen pass undetected grooves, holes, slots smaller mesh lined with the application or use of a smaller mesh

Screen test slot. During initiation, and should provide sufficient heat to maintain adequate to produce a uniform decomposition front.

A --- steel sheet (150mm × 150mm, thickness 1mm ~ 3mm);

B --- gas burner;

C --- heat shield plate (thickness 2mm);

D --- bracket (width of 15mm, a thickness of 2mm steel strip made);

E --- Network (150mm × 150mm × 500mm) slot.

FIG wire mesh tank 1 with gas burners

And heating means mounted 5.2.2

Selection of one of the following two heating means for heating.

5.2.2.1 electric heating means

A power means in a stainless steel box for the electric heater is 250W, which is placed at one end of the slot, as shown in FIG. stainless

Steel cassette size is 145mm × 145mm × 10mm, steel wall thickness of about 3mm. While the box is not in contact with the fertilizer available 5mm

Thick protective insulation board, while heating the protective foil or stainless steel plate.

In millimeters

A --- aluminum or stainless steel sheet (thickness 3mm);

B --- insulation panel (5mm thick);

C --- aluminum or stainless steel sheet (thickness 3mm);

D --- the position of the heating means in the groove.

Electrical heating means in FIG. 2 (power 250W)

Gas heating means 5.2.2.2

A groove disposed in an end of 1mm thick steel sheets ~ 3mm and contact with the screen, as shown in FIG. The two gas burners solid

Held on the holder groove. Sheet to the steel sheet is heated and maintained at a temperature of 400 °C ~ 600 °C, i.e., dark red hot.

5.2.3 Thermal shield device

In order to prevent the thermal spread along the outside of the groove, the groove away from the end of the heating installation at about 5cm 2mm thick steel plate as a heat shield.

5.2.4 Thermocouple

Use the appropriate thermocouple.

5.3 Test procedure

5.3.1 placement test cell

The test cell holder and placed under a fume hood to eliminate the decomposition gas, or placed in the open field in the flue gas can be easily dispersed. although

This test is not risk of explosion, but it is recommended that a transparent plastic plate or the like between the protective shield and the observer test tank.

5.3.2 Fill release fertilizer

In the transport vessel is loaded to be delivered in the form of fertilizers and fertilizer thermocouple placed in different positions.

5.3.3 heating caused by decomposition

Heating or gas heating in the form of decomposition of the initiator used in the electrical end of the slot. Heating was continued until a sufficiently decomposed to produce the fertilizer, and observed

Until propagation fronts (3cm ~ 5cm). In the case of products having high thermal stability, may be necessary to continue heating 2H; if fertilizer

Show a tendency to melt, it should be carefully heated, such as using a small flame.

5.3.4 Record

After the heating is stopped for about 20min, the recording position of the reaction front of the decomposition. The reaction front may be determined by differences in color, such as brown (not

Decomposition fertilizer) to white (decomposed fertilizer), or by determining interposed therebetween adjacent two pairs of thermocouple display fronts from the reaction temperature. Propagation speed

Level may be determined or recorded by thermocouples be determined by observing and timing. Whether or not a note should be decomposed after the heating is stopped or spread points

Whether the solution spread to all the material.

5.4 results found

5.4.1 If the decomposition after heating is stopped continues to spread to all the material, the result referred to as "", which can be self-sustaining decomposition of ammonium nitrate fertilizer.

5.4.2 If the decomposition did not continue to propagate all the material after heating is stopped, the result as "-."

5.4.3 Sample test results are shown in Table 1.

Note. ratio of NPK fertilizer as if it will not self-sustaining decomposition of standard, because depending on whether self-sustaining decomposition of chemical classes.

Part of the sample test results in Table 1

Test substance propagation distance/cm Results

Compound fertilizer NPK ratio of 50 17-11-22a

Compound fertilizer NPK ratio of 15-11-8b 10 -

Compound fertilizer NPK ratio of 14-14-14a 10 -

Compound fertilizer NPK ratio of 21-14-14a 10 -

Compound fertilizer NPK ratio of 50 12-12-18b

a chloride-containing.

b containing traces of cobalt and copper, but the chloride content is less than 1%.

0102-

END: Draft Version (GB 26447-2010)