Study on risk classification and critical value of key indexes of potassium nitrate by granulation

doi:10.16265/j.cnki.issn1003-3033.2023.S1.0177

Abstract

Abstract:

In order to clarify the influence of granulation on the classification results of the oxidation test of potassium nitrate and analyze the critical conditions for the exemption of granulated potassium nitrate from oxidant transport classification, this study selected granulated potassium nitrate products from representative enterprises in the industry. The study also carried out vibration and impact tests on samples with different particle sizes to simulate extreme conditions in the transport process. The crushing resistance and oxidation index of the samples before and after vibration and impact were evaluated. The results show that particle size is an important factor affecting the oxidation strength of granulated potassium nitrate. The particle size of granulated potassium nitrate with a high tower is above 2.8 mm; the particle size of granulated potassium nitrate with a high tower and inert material coating is above 2.5 mm, and that of compressed granulated potassium nitrate is above 3.0 mm. Therefore, the particle size can meet the classification standard of non-5.1 items in the national standard Classification and code of Dangerous Goods (GB 6944-2012), and there is the possibility for the exemption of oxidant transport classification.

Key words: granulation, potassium nitrate, classification, oxidation, critical value

MA Yanping, SUN Huaibo, FAN Bin. Study on risk classification and critical value of key indexes of potassium nitrate by granulation[J]. China Safety Science Journal, 2023, 33(S1): 128-133.

Figures/Tables 9

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References 10

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项目	组分	质量比
包装类别Ⅰ参考混合物(O.1)	溴酸钾与纤维素	3∶2
包装类别Ⅱ参考混合物(O.1)	溴酸钾与纤维素	2∶3
包装类别Ⅲ参考混合物(O.1)	溴酸钾与纤维素	3∶7
包装类别Ⅰ参考混合物(O.3)	过氧化钙与纤维素	3∶1
包装类别Ⅱ参考混合物(O.3)	过氧化钙与纤维素	1∶1
包装类别Ⅲ参考混合物(O.3)	过氧化钙与纤维素	1∶2
待测混合物1	样品与纤维素	1∶1
待测混合物2	样品与纤维素	4∶1

粒径/mm	A	B	C	D	E
1.0~2.0	72	88	/	90	/
2.0~3.0	88	83	85	123	84
2.5~2.8	104	104	94	124	88
2.8~3.0	114	129	117	142	117
3.0~3.35	116	109	166	147	133
3.35~3.5	146	141	171	180	144
3.5~4.0	141	171	164	210	199

粒径/mm	A	B	C	D	E
1.0~2.0	0.35	0.31	/	0.28	/
2.0~3.0	0.34	0.34	0.29	0.23	0.39
2.5~2.8	0.25	0.28	0.30	0.19	0.28
2.8~3.0	0.20	0.18	0.19	0.14	0.22
3.0~3.35	0.21	0.24	0.17	0.11	0.20
3.35~3.5	0.17	0.13	0.16	0.13	0.15
3.5~4.0	0.19	0.19	0.15	0.12	0.11

粒径/mm	A		B		C		D		E
粒径/mm	O.1	O.3	O.1	O.3	O.1	O.3	O.1	O.3	O.1	O.3
1.0~2.0	PGⅢ	PGⅢ	PGⅢ	PGⅢ	/	/	PGⅢ	PGⅢ	/	/
2.0~3.0	PGⅢ	PGⅢ	PGⅢ	PGⅢ	PGⅢ	PGⅢ	非5.1项	非5.1项	PGⅢ	PGⅢ
2.5~2.8	PGⅢ	PGⅢ	PGⅢ	PGⅢ	PGⅢ	PGⅢ	非5.1项	非5.1项	PGⅢ	PGⅢ
2.8~3.0	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项
3.0~3.35	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项
3.35~3.5	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项
3.5~4.0	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项	非5.1项

粒径/mm	A		B		C
粒径/mm	原样	振动、冲击后	原样	振动、冲击后	原样	振动、冲击后
1.0~2.0	3.2±0.6	3.5±0.8	24.7±8.1	29.0±4.6	/	/
2.0~3.0	4.7±1.4	4.6±1.1	44.1±11.6	42.1±8.8	14.5±2.9	9.4±2.5
2.5~2.8	4.3±0.8	4.9±1.3	17.8±4.0	33.1±4.1	8.8±2.8	11.0±5.2
2.8~3.0	5.4±1.5	5.7±1.5	28.2±5.4	45.7±8.2	12.5±4.3	14.4±6.3
3.0~3.35	6.7±1.6	6.9±1.9	54.3±15.2	59.6±9.3	14.9±6.3	13.2±6.4
3.35~3.5	6.4±1.6	7.7±2.1	32.8±5.0	50.8±14.0	15.5±6.5	14.4±4.5
3.5~4.0	6.3±2.3	9.1±2.3	52.8±6.3	56.7±4.5	25.26±9.7	27.1±3.8