硝酸分解磷矿过程中碘的迁移分布规律

doi:10.11962/1006-4990.2019-0303

Abstract

Abstract:

Phosphate ore decomposed by nitric acid is an important operating unit in the process of nitrophosphate produc-tion.The effects of acid hydrolysis time of 30~240 min,temperature of 40~90 ℃,nitric acid initial mass fraction of 40%~65% and acid to phosphate ore mass ratio of 1.15:1~1.35:1 on the migration and distribution of iodine in phosphate ore for gas,liquid and solid phases were studied.The results showed that in the decomposition process of phosphate ore by nitric acid,iodine transferred to the gas phase in the form of elemental.The distribution rate of iodine in gas phase increased with the increase of acidolysis time,temperature and nitric acid initial concentration.However,with the increase of mass ratio of acid to phosphate ore,iodine in the gas phase first increased and then decreased.The distribution rate of iodine in gas phase was more affected by acid hydrolysis time and temperature than by other parameters.When the process parameters were controlled at the acidolysis temperature of 60 ℃,nitric acid initial mass fraction of 55%,acid to phosphate ore mass ratio of 1.25:1 and acidolysis time of 120 min,the distribution rate of iodine in the gas phase was 65.21%,the distribution rate in the liquid phase was 26.89%,and the distribution rate in the solid phase was 7.91%.

Key words: phosphate ore, nitric acid, iodine, migration and distribution

CLC Number:

TQ124.61

Yang Ping,Yang Lin,Feng Yang,Lin Qian,Cao Jianxin. Migration and distribution of iodine in process of decomposing phosphate ore by nitric acid[J]. Inorganic Chemicals Industry, 2020, 52(4): 53-56.

Figures/Tables 9

References 10

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样品	酸解工艺参数				I的分布率/%
样品	酸解时间/min	酸解温度/℃	硝酸初始质量分数/%	酸矿比	气相	液相	固相
S1	30	60	55	1.25:1	41.99	34.85	23.16
S2	60				45.49	32.95	21.57
S3	90				53.38	32.86	13.75
S4	120				65.21	26.89	7.91
S5	180				75.46	16.74	7.80
S6	240				79.18	13.05	7.77

样品	酸解工艺参数				I的分布率/%
样品	酸解时间/min	酸解温度/℃	硝酸初始质量分数/%	酸矿比	气相	液相	固相
S7	120	40	55	1.25:1	38.76	45.09	16.15
S8		50			43.56	35.36	9.08
S9		60			65.21	26.89	7.91
S10		70			68.73	22.71	8.56
S11		80			73.45	17.47	9.08
S12		90			79.58	11.89	9.53

样品	酸解工艺参数				I的分布率/%
样品	酸解时间/min	酸解温度/℃	硝酸初始质量分数/%	酸矿比	气相	液相	固相
S13	120	60	40	1.25:1	49.28	42.30	8.42
S14			50		55.56	36.65	7.78
S15			55		65.21	26.89	7.91
S16			60		67.87	21.29	10.84
S17			65		71.52	16.78	11.70

样品	酸解工艺参数				I的分布率/%
样品	酸解时间/min	酸解温度/℃	硝酸初始质量分数/%	酸矿比	气相	液相	固相
S18	120	60		1.15:1	55.63	32.85	11.52
S19				1.20:1	60.18	30.51	9.31
S20			55	1.25:1	65.21	26.89	7.91
S21				1.30:1	60.83	31.44	7.73
S22				1.35:1	55.75	36.69	7.56

序号	反应方程
C-1	9I^-+8H⁺+2NO₃^-=3I₃^-+2NO+4H₂O
C-2	3I^-+4H⁺+2NO₃^-=I₃^-+2NO₂+2H₂O
C-3	2I^-+4H⁺+2NO₃^-=I₂+2NO₂+2H₂O
C-4	6I^-+8H⁺+2NO₃^-=3I₂+2NO+4H₂O
C-5	6I₃^-+8H⁺+2NO₃^-=9I₂+2NO+4H₂O
C-6	2I₃^-+4H⁺+2NO₃^-=3I₂+2NO₂+2H₂O

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Migration and distribution of iodine in process of decomposing phosphate ore by nitric acid

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序号	△G					log k
序号	25 ℃	40 ℃	60 ℃	80 ℃	100 ℃	25 ℃	40 ℃	60 ℃	80 ℃	100 ℃
C-1	-120.303	-121.851	-124.808	-128.702	-133.489	21.078	20.327	19.570	19.038	18.688
C-2	-45.819	-49.778	-55.847	-62.743	-70.426	8.028	8.304	8.757	9.281	9.859
C-3	-46.340	-50.010	-55.574	-61.845	-68.793	8.119	8.343	8.714	9.148	9.631
C-4	-121.085	-122.199	-124.398	-127.355	-131.040	21.215	20.385	19.506	18.839	18.345
C-5	-122.650	-122.895	-123.579	-124.661	-126.142	21.490	20.501	19.378	18.440	17.659
C-6	-23.692	-25.237	-27.514	-30.024	-32.764	4.151	4.210	4.314	4.441	4.587

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