离子交换法脱除湿法冶金工业MVR冷凝废水中盐类的研究

doi:10.19964/j.issn.1006-4990.2021-0377

Abstract

Abstract:

With the rapid development of the hydrometallurgy industry,the issue of zero discharge of industrial wastewater from its industrial production process has increasingly become a hot topic of concern in the industry.The effect of pretreatments times,loading height,operating flow rate and temperature on the working volume exchange capacity was investigated in a comparative test using two mixed beds,DDC600/DDA500 and 001×7MB/201×7MB,for the removal of salts from NaCl and Na₂SO₄ condensate wastewater generated by MVR.The results showed that the mixed bed was most effective in removing salts and the effluent could meet the reuse requirements at a pretreatment frequency of 3 times,a mixed bed height of 0.225 m,an operating flow rate of 20 m/h and a temperature of 20 °C.Thomas adsorption model was used to fit the Na⁺ dynamic adsorption pro-cess,and the correlation coefficient R² was ranged from 0.965 4 to 0.981 0,so there was a high fitting effect,and the relative deviations between the calculated theoretical and actual adsorption amounts were ranged from 3.97% to 6.89%.The MVR condensate wastewater could be reused after treatment,providing a useful reference for achieving a true convergence to zero discharge.

Key words: ion exchange, hydrometallurgy, MVR condensate wastewater, desalination, zero discharge

CLC Number:

X703

ZHOU Weifeng,CHI Yongzhi,LI Kaixiong,TIAN Sufeng,LIU Muzhi. Study on removal of salts from MVR condensate wastewater in the hydrometallurgical industry by ion exchange method[J]. Inorganic Chemicals Industry, 2022, 54(4): 152-158.

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References 20

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样品	pH	电导率/（μS·cm^-1）	TDS/（mg·L^-1）	ρ（Na⁺）/（mg·L^-1）	ρ（Cl^-）/（mg·L^-1）	ρ（SO₄^2-）/（mg·L^-1）	ρ（NH₄⁺）/（mg·L^-1）
NaCl冷凝废水	7.60	225.81±32.6	129.6±8.8	50.32±31.27	32.12±22.3	8.55±2.55	8.13±0.24
Na₂SO₄冷凝废水	7.19	175.46±23.56	85.1±9.1	38.45±29.33	21.67±5.76	35.23±11.21	1.61±0.81

树脂名称	功能基团	出厂离子形式	全交换容量/ （mmol·g^-1）	湿表观密度/ （g·mL^-1）	有效粒径/ mm	w（H₂O）/ %	再生次数
DDC600阳树脂	—SO₃H	Na⁺	4.36	0.83	0.63	40~45	≥2 000
DDA500阴树脂	—N⁺（CH₃）₃	Cl^-	3.49	0.67~0.73	0.55	40~45	≥2 000
001×7MB阳树脂	—SO₃H	Na⁺	4.50	0.78~0.88	0.73	45~50	≥800
201×7MB阴树脂	—N⁺（CH₃）₃	Cl^-	3.50	0.67~0.75	0.65	42~48	≥800

混床类型	冷凝废水类型	速率常数 K_T /（mL· min^-1·mg^-1）	理论吸附量q_e.C / （mg·mL^-1）	实际吸附量q_e.E / （mg·mL^-1）	吸附量偏差^①/ %	相关系数R²
DDC600/ DDA500	NaCl	0.025	7.746	7.450	3.97	0.978 0
DDC600/ DDA500	Na₂SO₄	0.028	8.600	8.222	4.60	0.970 4
001×7MB/ 201×7MB	NaCl	0.028 2	6.143	5.747	6.89	0.965 4
001×7MB/ 201×7MB	Na₂SO₄	0.032	7.731	7.261	6.47	0.981 0

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on removal of salts from MVR condensate wastewater in the hydrometallurgical industry by ion exchange method

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