低品位混合型磷矿的碳热还原工艺

doi:10.19964/j.issn.1006-4990.2021-0075

Abstract

Abstract:

Carbothermal reduction properties of low grade phosphate ore from Jinning,Yunnan were studied by kiln process.Four-factor and five-level orthogonal experiment was used to explore the influence of reaction temperature,reaction time,carbon excess coefficient,and Si/Ca ratio on the reduction rate of phosphate ore carbothermal reaction.The experimental re-sults showed that the order of factors influencing the phosphate ore reduction rate was as follows:Reaction temperature,carbon excess coefficient,reaction time,Si/Ca ratio.When the reaction temperature was 1 300 ℃,the carbon excess coefficient was 2.6,the reaction time was 1.5 h,and the ratio of n（Si）/n（Ca） was 1.5,the reduction rate could reach the highest value of 94.27%.Simultaneously,the applicability of Jinning,Yunnan low-grade mixed phosphate ore for kiln-process phosphoric acid production was evaluated,which showed that the mixed phosphate ore was suitable for kiln phosphoric acid production,and the research results had certain guiding significance for the low-grade mixed phosphate kiln process.

Key words: kiln process phosphoric acid, reduction rate, low grade phosphate ore, orthogonal experiment

CLC Number:

TQ126.31

HE Yanjun,ZHENG Hanxiao,LÜ Li,TANG Shengwei. Carbothermal reduction process of low-grade mixed phosphate ore[J]. Inorganic Chemicals Industry, 2021, 53(11): 95-99.

Figures/Tables 10

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References 16

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因素水平	A 温度/℃	B 时间/h	C n（SiO₂）/n（CaO）	D 碳过量系数
1	1 150	0.5	1.5	1.0
2	1 200	1.0	2.0	1.4
3	1 250	1.5	2.5	1.8
4	1 300	2.0	3.0	2.2
5	1 350	2.5	3.5	2.6

序号	水平组合	温度/ ℃	时间/ h	n（SiO₂）/ n（CaO）	碳过量系数	空列	还原率/%	序号	水平组合	温度/ ℃	时间/ h	n（SiO₂）/ n（CaO）	碳过量系数	空列	还原率/%
1	A₂B₂C₁D₂	1 200	1.0	1.5	1.4	1	25.33	14	A₅B₁C₁D₃	1 350	0.5	1.5	1.8	5	61.08
2	A₂B₄C₄D₄	1 200	2.0	3.0	2.2	2	41.24	15	A₅B₅C₄D₅	1 350	2.5	3.0	2.6	1	73.35
3	A₂B₃C₂D₃	1 200	1.5	2.0	1.8	3	30.69	16	A₃B₂C₃D₄	1 250	1.0	2.5	2.2	5	62.78
4	A₂B₁C₃D₅	1 200	0.5	2.5	2.6	4	36.05	17	A₃B₄C₅D₃	1 250	2.0	3.5	1.8	1	57.59
5	A₂B₅C₅D₁	1 200	2.5	3.5	1.0	5	2.04	18	A₃B₃C₁D₅	1 250	1.5	1.5	2.6	2	85.77
6	A₄B₂C₄D₃	1 300	1.0	3.0	1.8	4	74.55	19	A₃B₁C₄D₁	1 250	0.5	3.0	1.0	3	15.67
7	A₄B₄C₂D₅	1 300	2.0	2.0	2.6	5	84.30	20	A₃B₅C₂D₂	1 250	2.5	2.0	1.4	4	43.52
8	A₄B₃C₃D₁	1 300	1.5	2.5	1.0	1	70.79	21	A₁B₂C₅D₅	1 150	1.0	3.5	2.6	3	4.41
9	A₄B₁C₅D₂	1 300	0.5	3.5	1.4	2	60.31	22	A₁B₄C₁D₁	1 150	2.0	1.5	1.0	4	12.96
10	A₄B₅C₁D₄	1 300	2.5	1.5	2.2	3	84.91	23	A₁B₃C₄D₂	1 150	1.5	3.0	1.4	5	7.04
11	A₅B₂C₂D₁	1 350	1.0	2.0	1.0	2	32.57	24	A₁B₁C₂D₄	1 150	0.5	2.0	2.2	1	9.39
12	A₅B₄C₂D₂	1 350	2.0	2.5	1.4	3	59.58	25	A₁B₅C₃D₃	1 150	2.5	2.5	1.8	2	15.02
13	A₅B₃C₃D₄	1 350	1.5	3.5	2.2	4	78.96

指标		A	B	C	D	空列
磷的还原率	K1	48.81	182.50	270.05	134.02	236.85
	K2	135.35	199.63	200.46	195.78	235.35
	K3	265.32	273.24	244.22	238.93	196.12
	K4	374.85	255.66	211.84	277.28	245.58
	K5	305.54	218.84	203.31	283.88	218.47
	k1	9.76	36.50	54.01	26.80	47.37
	k2	27.07	39.93	40.09	39.16	47.07
	k3	53.06	54.64	48.84	47.79	39.22
	k4	74.97	51.13	42.37	55.45	49.12
	k5	61.11	43.77	40.66	56.78	43.69
	极差R	326.04	90.74	69.60	149.86	49.45
	因素主次	A>D>B>C
	优方案	A₄B₃C₁D₅

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Carbothermal reduction process of low-grade mixed phosphate ore

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