钾混盐粒度组成对其转化浮选的影响机制研究

doi:10.19964/j.issn.1006-4990.2024-0031

Abstract

Abstract:

Potassium sulfate is very important to grain production in China.In order to speed up the efficient preparation of potassium sulfate and ensure the stable development of agriculture in China，the preparation of the key intermediate of potassium sulfate was studied.Firstly，aiming at the problem that the particle size of potassium mixed salt in Lop Nur Salt Lake was easy to vary with the seasons，which led to the low production efficiency of picromerite，the effect mechanism of particle size composition of potassium mixed salt on its conversion flotation was studied by grinding⁃conversion⁃flotation process.The results showed that the particle size of potassium mixed salt was finer，the degree of transformation was higher，and the particle size of the transformed product was finer.After grinding 3 min with potassium mixed salt，the corresponding <0.074 mm conversion products accounted for 42.69%，and potassium ions were mainly distributed in the material of this particle size.At the same time，the flotation behavior of picromerite was also significantly affected by the particle size of potassium mixed salt，and its flotation efficiency was increased at first and then decreased with the decrease of the particle size of potassium mixed salt.When the grinding fineness of potassium mixed salt <0.250 mm accounted for 79.78%，the production efficiency of picromerite was the highest.In addition，the effect of the particle size of the conversion product on the flotation separation of jarosite and sodium chloride was also studied in this paper.The results showed that the particle size of the conversion product was finer，the difference of flotation rate constant between magnesite and sodium chloride was less，which was only 0.094 5 min^-1 at <0.074 mm，so it was difficult to separate them effectively.The research results had important guiding significance for the regulation and optimization of the production process of soft potassium magnesium alum.

Key words: potassium mixed salt, picromerite, grinding, conversion, flotation

CLC Number:

TQ131.13

ZHU Jian, DONG Guangfeng, CHEN Peng, JIA Feifei, MA Songliang, LIU Zhongjian, XIANG Xiaocheng. Study on influence mechanism of particle size composition of potassium mixed salt on its conversion flotation[J]. Inorganic Chemicals Industry, 2024, 56(10): 64-69.

Figures/Tables 10

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References 20

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原料	w（Na⁺）	w（K⁺）	w（Mg²⁺）	w（SO₄^2-）	w（Cl^-）
钾混盐	8.84	8.76	6.33	19.46	25.67
转化母液	1.09	2.04	1.20	3.85	4.20
调浆母液	3.62	2.67	3.87	6.86	14.22

原矿筛析后各粒级/mm	分布占比/%	w（K⁺）/ %	w（Na⁺）/ %	K⁺分布率/%	Na⁺分布率/%
<0.074	12.26	19.55	0.32	13.23	0.68
0.074~<0.150	17.89	21.59	0.79	21.33	2.44
0.150~<0.250	9.99	27.98	1.83	15.45	3.16
0.250~0.850	13.89	26.64	9.45	20.43	22.68
>0.850	45.97	11.64	8.94	29.56	71.04

磨矿时间/min		钾混盐各粒级产率/%
磨矿时间/min		< 0.074 mm	0.074~< 0.150 mm	0.150~<0.250 mm	0.250~0.850 mm	> 0.850 mm
0	12.26		17.89	9.99	13.89	45.97
1	42.31		10.94	13.58	8.16	25.01
3	54.64		14.65	10.49	4.75	15.47
5	58.04		18.45	7.62	3.30	12.59

不同粒级/mm	浮选精矿产物	ε_∞/%	k/min^-1	R²
<0.074	软钾镁矾	114.988 8	1.848 5	0.980 3
<0.074	氯化钠	115.034 2	1.754 0	0.974 4
0.074~<0.150	软钾镁矾	110.128 1	2.806 0	0.976 5
0.074~<0.150	氯化钠	112.461 4	0.791 3	0.948 0
0.150~<0.250	软钾镁矾	106.601 5	2.941 1	0.981 9
0.150~<0.250	氯化钠	91.327 3	0.680 2	0.961 2

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Study on influence mechanism of particle size composition of potassium mixed salt on its conversion flotation

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