烧结机头灰浸出提取高纯度氯化钾的研究

doi:10.19964/j.issn.1006-4990.2023-0570

Abstract

Abstract:

In order to achieve high value-added utilization of potassium chloride in the ash of sintering machine head，electrostatic precipitator dust from the sintering machine head and high-salt alkaline wash dewatering were used as raw materials.By adopting the process route of pretreatment，high salt wastewater synergistic water elution of potassium，vacuum filtration，impurity removal and decolorization，solid-liquid separation，and salt crystallization，Box Behnken experiment was designed.The mathematical model between three factors of leaching temperature，liquid-solid ratio，and stirring speed，and the removal rate of potassium from sintering machine head ash was established.The removal rate of ash and potassium from sintering machine head was optimized by using Box Behnken method，and salt crystallization was carried out by measuring the solubility of sodium chloride and potassium chloride at different temperatures.The response surface analysis experimental results showed that the degree of influence of three factors on the removal rate of potassium in the ash of the sintering machine head was in descending order：leaching temperature，liquid-solid ratio，and stirring speed.The optimal process conditions for leaching were a leaching temperature of 51.45 ℃，a liquid-solid mass ratio of 2.85∶1，a stirring rate of 674 r/min，and a potassium removal rate of 93.89% after 30 minutes.After impurity removal and decolorization treatment of potassium containing filtrate，the NaCl-KCl-H₂O water salt system phase diagram was used to control the evaporation conditions for salt crystallization，so that the flash endpoint was controlled within the single solid phase crystallization zone of potassium chloride，and a purity of 92% potassium chloride product could be obtained.

Key words: sintering machine head ash, synergistic, response surface method, salt separation, potassium chloride

CLC Number:

TQ131.13

CHEN Junhui, LIU Xiang, HU Qingxi, TIAN Bangxin, CHEN Jiale. Study on leaching extraction of high purity potassium chloride from sintering machine head ash[J]. Inorganic Chemicals Industry, 2024, 56(6): 102-108.

Figures/Tables 13

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References 14

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因子		A（温度/℃）	B（液固比）	C［搅拌速率/（r·min^-1）］
水平	-1	30	2∶1	300
	0	50	3∶1	500
	1	70	4∶1	700

序号	A	B	C	Y/%
1	30	2∶1	500	75.62
2	70	2∶1	500	82.26
3	30	4∶1	500	79.26
4	70	4∶1	500	93.86
5	30	3∶1	300	82.77
6	70	3∶1	300	89.60
7	30	3∶1	700	86.13
8	70	3∶1	700	93.87
9	50	2∶1	300	78.17
10	50	4∶1	300	89.21
11	50	2∶1	700	87.43
12	50	4∶1	700	93.74
13	50	3∶1	500	90.76
14	50	3∶1	500	92.53
15	50	3∶1	500	91.75
16	50	3∶1	500	91.56
17	50	3∶1	500	90.52

项目	均方和	自由度	均方	F	P	显著性
模型	541.08	9	60.12	31.25	< 0.000 1	显著
A	160.29	1	160.29	83.32	< 0.000 1
B	132.76	1	132.76	69.01	< 0.000 1
C	57.35	1	57.35	29.81	0.000 9
AB	15.84	1	15.84	8.23	0.024
AC	0.207	1	0.207	0.107 6	0.752 5
BC	5.59	1	5.59	2.91	0.132
A²	62.72	1	62.72	32.6	0.000 7
B²	97.6	1	97.6	50.73	0.000 2
C²	1.17	1	1.17	0.610 1	0.460 3
残差	13.47	7	1.92
失拟差	10.86	3	3.62	5.56	0.065 5	不显著
纯误差	2.61	4	0.651 5
总和	554.55	16

实验编号	钾脱除率（Y）/%			相对误差/ %
实验编号	实验值	平均值	预测值	相对误差/ %
1	95.34
2	94.67	94.88	93.89	1.04
3	94.62

操作点温度/℃	物料	质量分数/%		相图点位
操作点温度/℃	物料	NaCl	KCl	相图点位
0	原水	10.26	10.71	C0
25	回流母液	18.76	11.45	C6
12	三效混合进料	14.19	10.69	C1
110	三效蒸发终点（固混）	23.99	18.07	C2
110	三效蒸发终点（液相）	15.88	20.00	C3
45~50	闪发起点（兑卤后）	15.22	18.87	C4
45~50	闪发结晶终点（固混）	16.47	20.42	C5
45~50	闪发结晶终点（液相）	17.60	14.95	C5
25	冷却结晶终点（液相）	18.76	11.45	C6

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on leaching extraction of high purity potassium chloride from sintering machine head ash

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