中低品位磷矿预处理提磷降杂技术研究

doi:10.11962/1006-4990.2019-0335

Abstract

Abstract:

In view of the problem that middle-low grade phosphate ore can not be directly processed and the composition charac-teristics of Jinning phosphate ore in Yunnan Province,YP collectors were used to desilicate the raw ore by positive flotation,and then concentrated wet-process phosphoric acid and nitric acid were used to magnisium removal of the phosphate ore after desilication.The orthogonal experiment results showed that when nitric acid was used as pretreatment agent,the optimum conditions for magnesium removal were liquid-solid ratio of 4,pH of 2.5,temperature of 60 ℃,and reaction time of 4 h.Under these conditions,magnesium-phosphorus ratio（Mass fraction ratio of MgO to P₂O₅） of concentrate was 2.16% and phosphorus loss rate was 1.7%.When wet-process phosphoric acid was used as pretreatment agent,the optimum conditions for magnesium removal were pH of 2.5,liquid-solid mass ratio of 3,reaction time of 2 h and temperature of 50 ℃.The magnesium-phosphorus ratio of concentrate was 3.32%,and the phosphorus loss rate was 0.3%.At the same time,the experimental data were fitted and analyzed,and the dynamic model of the core index of dry magnesium-phosphorus ratio was obtained.The study provided a new idea and reference value for the effective utilization of high silicon middle-low grade phosphate rock in China.

Key words: phosphate ore, positive flotation, magnesium removal, orthogonal experiment, fitting analysis

CLC Number:

TQ126.31

Li Jieen,He Binbin,Yang Xiushan,Xu Dehua,Zhang Zhiye. Study on phosphorus extraction and impurity reduction technology for pretreatment of middle-low grade phosphate ore[J]. Inorganic Chemicals Industry, 2020, 52(4): 33-36.

Figures/Tables 13

References 10

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水平	因素
水平	A 液固比	B 酸处理时间/h	C 酸处理温度/℃	D pH
1	2	2	60	4.5
2	3	3	50	3.5
3	4	4	40	2.5

实验号	列号				指标
实验号	A	B	C	D	q（P）/ %	w（MgO）/ w（P₂O₅）	w（P₂O₅）/ %
P-1	2	2	60	4.5	0.33	0.107 0	25.78
P-2	2	3	50	3.5	1.35	0.095 6	24.48
P-3	2	4	40	2.5	1.22	0.085 8	26.23
P-4	3	2	50	2.5	1.30	0.061 8	27.20
P-5	3	3	40	4.5	0.19	0.089 2	26.57
P-6	3	4	60	3.5	1.50	0.031 8	28.60
P-7	4	2	40	3.5	0.73	0.045 9	27.24
P-8	4	3	60	2.5	1.77	0.022 1	28.49
P-9	4	4	50	4.5	0.52	0.076 1	26.66

指标		列号
指标		A	B	C	D
干基镁磷比	均值k₁	0.096 1	0.071 6	0.053 7	0.090 8
	均值k₂	0.060 9	0.069 0	0.077 8	0.057 8
	均值k₃	0.048 0	0.064 6	0.073 6	0.056 6
	极差R	0.048 1	0.007 0	0.024 1	0.034 2
	较优水平	A₃	B₃	C₁	D₃
	因素主次	A₃>D₃> C₁> B₃

指标	方差来源	偏差平方和	自由度	F值	显著性
干基镁磷比	A	0.003 72	2	49.66	*
	B	0.000 07	2	1.00
	C	0.001 00	2	13.36
	D	0.002 27	2	30.26	*
	误差	0.001 07	4

实验号	列号				指标
实验号	A	B	C	D	q（P）/ %	w（MgO）/ w（P₂O₅）	w（P₂O₅）/ %
P-1	2	2	60	4.5	1.62	0.109 0	25.97
P-2	2	3	50	3.5	1.03	0.109 0	25.65
P-3	2	4	40	2.5	2.95	0.077 8	25.86
P-4	3	2	50	2.5	0.30	0.033 2	27.74
P-5	3	3	40	4.5	1.97	0.105 0	25.89
P-6	3	4	60	3.5	1.74	0.106 0	25.74
P-7	4	2	40	3.5	0.40	0.109 0	25.56
P-8	4	3	60	2.5	1.44	0.086 0	26.18
P-9	4	4	50	4.5	0.41	0.109 0	25.25

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on phosphorus extraction and impurity reduction technology for pretreatment of middle-low grade phosphate ore

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指标	方差来源	偏差平方和	自由度	F值	显著性
干基镁磷比	A	0.000 686	2	1.47
	B	0.000 473	2	1.01
	C	0.000 467	2	1.00
	D	0.0036 1	2	7.71	*
	误差	0.000 94	4

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指标		列号
指标		A	B	C	D
干基镁磷比	均值k₁	0.098 6	0.083 8	0.100 0	0.108 0
	均值k₂	0.081 7	0.100 0	0.083 9	0.108 0
	均值k₃	0.101 0	0.097 4	0.097 4	0.065 6
	极差R	0.019 3	0.016 2	0.016 1	0.042 4
	较优水平	A₂	B₁	C₂	D₃
	因素主次	D₃>A₂>B₁>C₂