基于热力学分析与响应曲面法研究磷尾矿中钙镁浸出率

doi:10.19964/j.issn.1006-4990.2024-0041

Abstract

Abstract:

In the recovery of calcium and magnesium resources in phosphorus tailings，the tailings are usually calcined firstly，and then the calcium and magnesium in the tailings are leached by leaching process for subsequent resource recovery.In the calcination process，it is necessary to decompose dolomite in phosphorus tailings as much as possible，while the fluorine apatite is retained.In this study，HSC Chemistry software was used to conduct thermodynamic analysis of calcination of phosphorus tailings to optimize calcination conditions.In the process of leaching calcium and magnesium from tailings calcined，based on response surface method，the interaction effects of ammonia-calcium mole ratio（7∶1~11∶1），liquid-solid mass ratio（7∶1~9∶1），reaction temperature（60~80 ℃） and reaction time（50~70 min） on the leaching rate of calcium and magnesium were analyzed，and the leaching conditions were optimized.The results showed that the calcination temperature range of the dolomite completely decomposed into CaO and MgO and the fluorapatite undecomposed range was（900~1 200 ℃）.The optimal leaching rates of calcium and magnesium were 92.25% and 86.19% when ammonia-calcium mole ratio was 10∶1，liquid-solid mass ratio was 8∶1，reaction temperature was 71 ℃ and reaction time was 66 min，respectively.According to the optimized leaching conditions，several experiments were carried out，and the experimental results showed that the leaching rate of calcium was 91.95% and that of magnesium was 85.85%.The experimental results were close to the optimization results，which proved that the optimization results were more accurate，and through simulation optimization and experimental verification，it could be seen that the ammonium-calcium ratio had a greater impact on the leaching rate.

Key words: phosphorus tailings, thermodynamic analysis, response surface method, calcium and magnesium leaching, calcination

CLC Number:

TQ126.3

TANG Dongwu, YE Changwen, DENG Jie, AO Fang. Study on leaching rate of calcium and magnesium from phosphorus tailings based on thermodynamic analysis and response surface method[J]. Inorganic Chemicals Industry, 2024, 56(9): 98-106.

Figures/Tables 16

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Table 2

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项目	标准差	平均值	变异系数C.V/%	R²	调整决定系数R²	预测决定系数R²	信噪比	P值
钙	0.085 9	88.93	0.096 6	0.999 6	0.999 2	0.997 7	164.803 5	<0.000 1
镁	0.267 6	81.84	0.327 0	0.998 0	0.996 1	0.996 9	67.554 8	<0.000 1

项目		钙浸出率/%	镁浸出率/%
实验值	1	91.87	85.93
	2	92.03	85.86
	3	91.95	85.76
平均值		91.95	85.85
预测值		92.95	86.19

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Study on leaching rate of calcium and magnesium from phosphorus tailings based on thermodynamic analysis and response surface method

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序号	铵钙比	液固比	反应温度/℃	反应时间/min	钙浸出率/%	镁浸出率/%
1	9∶1	9∶1	60	60	88.99	83.35
2	9∶1	7∶1	70	70	90.21	82.87
3	9∶1	8∶1	60	50	87.33	81.92
4	9∶1	8∶1	70	60	90.77	84.89
5	7∶1	8∶1	80	60	84.79	74.56
6	7∶1	8∶1	60	60	81.99	73.61
7	9∶1	8∶1	60	70	89.04	83.38
8	7∶1	8∶1	70	70	84.54	74.67
9	11∶1	8∶1	60	60	89.45	85.11
10	11∶1	9∶1	70	60	91.45	86.14
11	9∶1	8∶1	80	50	90.13	82.88
12	9∶1	7∶1	80	60	90.46	82.83
13	11∶1	8∶1	70	70	91.99	86.19
14	9∶1	8∶1	70	60	90.77	83.75
15	9∶1	8∶1	70	60	90.78	83.79
16	9∶1	8∶1	70	60	90.79	83.77
17	9∶1	7∶1	60	60	87.66	81.89
18	7∶1	8∶1	70	50	82.82	73.21
19	11∶1	8∶1	80	60	92.25	86.06
20	9∶1	9∶1	70	50	89.83	82.96
21	9∶1	9∶1	70	70	91.54	84.44
22	9∶1	8∶1	80	70	91.84	84.32
23	11∶1	7∶1	70	60	90.61	84.68
24	9∶1	9∶1	80	60	91.81	84.31
25	7∶1	7∶1	70	60	83.15	73.18
26	9∶1	8∶1	70	60	90.79	83.78
27	11∶1	8∶1	70	50	90.28	84.71
28	9∶1	7∶1	70	50	88.51	81.52
29	7∶1	9∶1	70	60	84.49	74.64