吉兰泰盐湖尾矿生产液体盐中试工艺研究

doi:10.19964/j.issn.1006-4990.2022-0183

Abstract

Abstract:

Taking the second layer salt from the ship of Jilantai south line as the raw material,the ammonia alkali waste liquid and fresh water were mixed and then the solution extraction reaction was used to remove sulfate radical and produce liquid salt for soda ash.Pilot scale research was used to optimize the process conditions.On the basis of the optimum process conditions of pilot test,the influence of polyacrylamide on the sedimentation effect of calcium sulfate dihydrate was determined.The results of pilot study showed that the volume ratio of ammonia alkali waste liquid to fresh water in the slag washing process was 1∶9,the residence time of slag washing was 2.5 h,the residence time of brine making was 3 h,the optimal n（sulfate）∶n（calcium ion） for the secondary desulfurization of the reaction tank was 1∶0.75,and the residence time of the secondary desulfurization of the reaction tank was 5 min.When the amount of polyacrylamide added in the secondary sedimentation process was 62.5 mg/L,the sedimentation effect of calcium sulfate dihydrate was better,and the light transmittance of liquid salt was≥80%.Under the optimized process conditions,the liquid salt standard for enterprise soda production could be reached,in which the mass concentration of calcium ion was ≤2 g/L,the mass concentration of sulfate radical was≤5 g/L,and the mass concentration of sodium chloride was≥305 g/L.at the same time,the comprehensive utilization of resources could be realized by using this process.

Key words: Jilantai, liquid salt, salt lake tailing, comprehensive utilization

CLC Number:

TD926.4

SUN Zhicheng,DU Wei,WANG Runpu,CHENG Penggao,ZHANG Rong,GAO Weixing,WANG Zhanhe,HU Kaibao,TANG Na. Study on pilot scale process of producing liquid salt from Jilantai salt lake tailings[J]. Inorganic Chemicals Industry, 2022, 54(10): 46-52.

Figures/Tables 17

Table 1

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Fig.1

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Fig.3

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Table 6

Fig.4

Table 7

Table 8

Table 9

Table 10

Table 11

Table 12

Fig.5

References 16

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实验编号	V（氨碱废液）∶ V（淡水）	液相离子质量浓度/（g?L^-1）					相对密度
实验编号	V（氨碱废液）∶ V（淡水）	Cl^-	Ca²⁺	Mg²⁺	SO₄^2-	NaCl	相对密度
1	1∶3	113.30	10.21	0.12	1.32	158.01	1.11
2	1∶3	119.32	10.62	0.06	0.83	196.70	1.12
3	1∶3	118.45	8.80	0.17	1.08	170.08	1.11
4	1∶4	126.06	7.12	0.12	1.81	133.60	1.12
5	1∶4	105.41	7.80	0.10	3.77	173.77	1.12
6	1∶4	110.72	7.05	0.23	3.51	182.53	1.12
7	1∶7	123.45	3.84	0.09	1.52	193.74	1.13
8	1∶7	105.50	3.63	0.04	1.86	173.92	1.11
9	1∶7	89.98	4.06	0.07	1.81	138.32	1.10
10	1∶9	140.40	3.06	0.10	3.57	231.36	1.12
11	1∶9	110.56	3.67	0.09	1.66	188.09	1.11
12	1∶9	113.02	3.43	0.05	2.30	186.24	1.11

盐渣		清洗后盐渣组成分析
盐渣		w（Cl^-）	w（Ca²⁺）	w（Mg²⁺）	w（SO₄^2-）	w（CaSO₄）	w（MgSO₄）	w（Na₂SO₄）	w（NaCl）
过程随机取样	盐渣1	4.19	2.07	0.007 6	5.14	7.03	0.038	0.22	6.91
	盐渣2	1.77	3.81	0.015	9.26	12.94	0.074	0.10	2.92
	盐渣3	2.47	3.78	0.012	9.80	12.84	0.059	1.02	4.07

实验编号	V（氨碱废液）∶ V（淡水）	液相离子质量浓度/（g?L^-1）
实验编号	V（氨碱废液）∶ V（淡水）	Cl^-	Ca²⁺	Mg²⁺	SO₄^2-	NaCl
1	1∶3	187.57	5.61	0.19	1.91	309.20
2	1∶3	191.26	3.78	0.21	2.78	315.28
3	1∶3	192.34	5.51	0.56	1.22	317.07
4	1∶4	188.44	4.59	0.12	1.08	310.62
5	1∶4	190.17	2.69	0.16	3.38	308.97
6	1∶4	192.57	4.19	0.12	1.08	305.94
7	1∶7	190.39	2.04	0.21	4.31	313.74
8	1∶7	193.43	1.76	0.11	3.62	317.61
9	1∶7	190.17	1.74	0.12	3.77	312.42
10	1∶9	193.43	1.57	0.01	3.77	318.88
11	1∶9	191.26	1.25	0.11	3.70	315.29
12	1∶9	193.43	1.49	0.15	4.06	318.72

实验编号	停留时间/h	液相离子质量浓度/（g?L^-1）
实验编号	停留时间/h	Cl^-	Ca²⁺	Mg²⁺	SO₄^2-	NaCl
1	2.5	192.83	3.51	0.16	2.06	309.56
2	2.5	193.27	3.49	0.17	1.81	309.78
3	2.5	191.74	3.37	0.31	1.57	306.67
4	3.0	190.19	1.43	0.16	4.99	313.50
5	3.0	191.26	1.33	0.19	6.85	315.17
6	3.0	190.17	1.25	0.24	6.46	313.50
7	4.0	189.04	0.84	0.19	7.78	311.62
8	4.0	190.12	1.00	0.07	6.61	313.42
9	4.0	192.52	0.80	0.26	8.61	317.25

运行时间/h	相对密度	透光率/ %	液相各离子质量浓度/（g·L^-1）
运行时间/h	相对密度	透光率/ %	Ca²⁺	SO₄^2-	Mg²⁺	Cl^-	NaCl
1	1.19	91.60	0.94	7.34	0.23	190.17	313.38
2	1.19	92.50	0.92	7.83	0.25	189.30	311.95
3	1.19	90.90	0.92	7.78	0.25	173.87	286.52
4	1.19	91.80	0.88	8.86	0.27	188.00	309.80
5	1.19	95.50	0.86	8.66	0.28	188.22	310.17
6	1.19	94.20	0.82	8.56	0.31	189.74	312.67
7	1.19	92.70	0.88	8.22	0.27	188.87	311.24
8	1.19	88.70	1.02	7.58	0.19	191.91	316.25
9	1.19	91.00	1.02	7.58	0.19	191.26	315.29
10	1.19	93.00	0.96	8.07	0.31	189.30	312.07
11	1.19	92.00	1.08	9.05	0.21	191.26	315.29
12	1.19	92.40	1.12	6.36	0.15	190.17	313.50
13	1.19	93.60	1.22	7.49	0.12	187.08	308.40
14	1.19	84.20	0.92	7.34	0.36	189.25	311.98
15	1.19	93.60	0.92	9.30	0.31	189.25	311.98
16	1.19	75.90	0.84	7.83	0.30	189.04	311.62
17	1.19	81.10	0.90	8.47	0.22	188.17	310.19
18	1.19	84.00	0.92	8.81	0.19	189.04	311.62
19	1.19	86.20	0.82	8.81	0.25	185.99	306.60
20	1.19	87.30	0.80	9.05	0.26	189.25	311.98
21	1.19	90.00	0.90	6.56	0.20	187.95	309.83
22	1.19	92.00	0.92	9.05	0.25	190.34	313.78
23	1.19	79.70	0.96	9.98	0.21	188.17	310.20
24	1.19	82.00	0.84	9.30	0.25	189.91	313.07
25	1.19	84.40	0.78	9.79	0.33	171.43	315.57
26	1.19	86.10	1.00	8.66	0.28	190.34	313.66

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on pilot scale process of producing liquid salt from Jilantai salt lake tailings

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停留时间/min	n（硫酸根）∶ n（钙离子）	液相各离子质量浓度/（g·L^-1）
停留时间/min	n（硫酸根）∶ n（钙离子）	Cl^-	Ca²⁺	Mg²⁺	SO₄^2-	NaCl
10	1∶0.8	189.25	1.91	0.53	4.28	311.98
10	1∶0.75	190.34	1.54	0.49	5.01	313.78
10	1∶0.7	191.86	1.85	0.46	5.60	316.28
5	1∶0.8	190.34	1.93	0.49	4.92	313.78
5	1∶0.75	180.33	1.79	0.46	4.34	306.32
5	1∶0.7	183.65	1.69	0.42	5.18	310.20

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相对密度	液相各离子质量浓度/（g·L^-1）					n（硫酸根）∶ n（钙离子）
相对密度	Cl^-	Ca²⁺	Mg²⁺	SO₄^2-	NaCl	n（硫酸根）∶ n（钙离子）
1.19	185.82	1.55	0.48	5.26	307.07	1∶0.7
1.19	183.68	1.53	0.50	5.19	308.10	1∶0.7
1.19	185.74	1.60	0.44	5.20	307.12	1∶0.7
1.19	184.68	1.73	0.49	4.75	306.62	1∶0.75
1.19	182.69	1.75	0.45	4.80	305.23	1∶0.75
1.19	184.25	1.70	0.48	4.77	306.58	1∶0.75
1.19	190.45	2.05	0.48	4.55	309.02	1∶0.8
1.19	189.23	2.04	0.50	4.38	308.95	1∶0.8
1.19	190.12	2.03	0.49	4.53	309.27	1∶0.8

运行时间/h	相对密度	透光率/ %	液相各离子质量浓度/（g·L^-1）
运行时间/h	相对密度	透光率/ %	Ca²⁺	SO₄^2-	Mg²⁺	Cl^-	NaCl
1	1.19	96.10	1.93	4.31	0.51	191.43	315.27
2	1.19	94.20	1.73	5.21	0.55	189.69	312.70
3	1.19	82.90	1.82	4.95	0.55	186.21	306.96
4	1.19	90.40	1.40	4.97	0.51	190.99	314.85
5	1.19	88.50	1.41	5.16	0.49	189.25	311.98
6	1.19	89.30	1.60	5.21	0.51	186.21	306.96
7	1.19	77.70	1.90	5.55	0.31	191.79	316.15
8	1.19	92.30	1.24	2.94	1.03	186.64	307.68
9	1.19	97.00	2.14	5.11	0.49	189.49	311.98
10	1.19	87.30	1.82	3.31	0.56	189.49	312.37
11	1.19	90.20	1.85	4.14	0.26	191.13	315.07
12	1.19	92.50	1.79	4.19	0.32	190.59	314.17