碱洗氧化工艺中杂质对硫酸钠结晶粒度的影响

doi:10.19964/j.issn.1006-4990.2021-0397

Abstract

Abstract:

Aiming at the evaporative crystallization of sodium sulfate in the desulfurization wastewater from alkaline washing oxidation process,an experimental device was designed and developed to investigate the influence of the impurities on the evaporative crystallization of sodium sulfate,mainly on the particle size of the sodium sulfate crystal,which include sodium carbonate,ferric ion and sodium sulfite in the wastewater.The results showed that 1.0% mass fraction of sodium carbonate in wastewater had no obvious influence on the particle size of sodium sulfate crystal.When iron existed in the form of precipitate,it was easy to cause sodium sulfate crystals to agglomerate and the particle size becomed smaller.When iron was existed in dissolved form,it had little effect on the particle size of sodium sulfate crystal.The existence of sodium sulfite was easy to reduce the particle size of sodium sulfate crystal.After eliminating sodium sulfite in wastewater by H₂O₂ oxidation,the crystal size of sodium sulfite was increased apparently.After the transformation of the industrial device,the average particle size of the anhydrous Na₂SO₄ product was increased from 106.71 μm to 129.99 μm.

Key words: impurity, anhydrous sodium sulfate, vaporation crystallization, rystal size

CLC Number:

TQ131.12

LIU Zhuang,AN Jimin,LI Yongjun,CHEN Xing,ZHAO Yigang,ZHAI Ruiguo. Effect of impurity in alkaline washing oxidation process on crystal size of sodium sulfate[J]. Inorganic Chemicals Industry, 2022, 54(4): 123-127.

Figures/Tables 12

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References 19

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项目			w （Na₂SO₄）/ %	w （水不溶物）/%	w [钙和镁（以Mg计）]/ %	w [氯化物（以Cl 计）]/%	w [铁（Fe）]/%	w （水分）/ %	白度（R457）/ %	pH（50 g/L 水溶液, 25 ℃）	w （Na₂SO₃）/ %	w （Na₂CO₃）/ %
无水Na₂SO₄			86.3	0.08	—	0.03	0.035	0.57	65	8.6	11.5	0.6
指标	Ⅱ类	一等品	≥98.0	≤0.10	≤0.30	≤0.70	≤0.010	≤0.50	82	—
	Ⅱ类	合格品	≥97.0	≤0.20	≤0.40	≤0.90	≤0.040	≤1.0	—	—
	Ⅲ类	一等品	≥95.0	—	≤0.60	≤2.0	—	≤1.5	—	—
	Ⅲ类	合格品	≥92.0	—	—		—	—	—	—

杂质Fe含量/（mg·L^-1）	质量分数/%								平均粒径/ μm
杂质Fe含量/（mg·L^-1）	<75 μm	75~125 μm	125~150 μm	150~212 μm	212~300 μm	300~425 μm	425~600 μm	600~850 μm	平均粒径/ μm
0	2.32	5.98	6.39	13.11	25.11	27.98	19.01	0.10	303.23
11.1,无沉淀	3.78	8.54	7.01	12.76	21.33	29.56	17.02	0.00	291.68
20.0,有沉淀	7.21	11.57	12.05	13.56	18.87	34.43	2.31	0.00	240.34
50.0,有沉淀	8.11	11.72	13.25	12.27	17.89	35.44	1.32	0.00	236.22

杂质Fe含量/ （mg·L^-1）	白度（R457）/%	杂质Fe含量/ （mg·L^-1）	白度（R457）/%
0	90	20.0,有沉淀	74
11.1,无沉淀	82	50.0,有沉淀	68

组成	质量分数/%								平均粒径/ μm
组成	<75 μm	75~125 μm	125~150 μm	150~212 μm	212~300 μm	300~425 μm	425~600 μm	600~850 μm	平均粒径/ μm
Na₂SO₄ 20.0%	2.32	5.98	6.39	13.11	25.11	27.98	19.01	0.10	303.23
Na₂SO₄ 15.0%,Na₂SO₃ 5.0%	11.55	25.34	11.23	8.22	12.86	28.26	2.54	0.00	208.37
Na₂SO₄ 20.0%,Na₂SO₃ 5.0%	10.88	17.95	20.66	9.12	11.65	17.96	11.78	0.00	222.25

组成	晶体组分含量/%
组成	w（Na₂SO₄）	w（Na₂SO₃）
Na₂SO₄ 20%	100.0	0.0
Na₂SO₄ 15%,Na₂SO₃ 5%	76.1	23.9
Na₂SO₄ 20%,Na₂SO₃ 5%	80.3	19.8

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Inorganic Acid-Base-Salt Committee of CIESC

Effect of impurity in alkaline washing oxidation process on crystal size of sodium sulfate

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样品处理方式	质量分数/%								平均粒径/ μm
样品处理方式	<75 μm	75~125 μm	125~150 μm	150~212 μm	212~300 μm	300~425 μm	425~600 μm	600~850 μm	平均粒径/ μm
样品20.0%,无处理	23.65	24.56	26.32	11.89	8.91	4.65	0.02	0.00	130.91
过滤除铁沉淀	18.56	21.83	30.11	12.65	10.40	5.43	1.02	0.00	144.62
氧化Na₂SO₃	8.79	13.99	14.12	13.23	13.22	24.11	12.54	0.00	246.16

样品处理方式	晶体组分含量/%
样品处理方式	w （Na₂SO₄）	w （Na₂SO₃）	w [铁（Fe）]	白度（R457）/%
样品20.0%,无处理	85.2	10.8	0.031	67
过滤除铁沉淀	85.9	11.1	0.005	82
氧化Na₂SO₃	98.6	0.2	0.028	75

项目	w （Na₂SO₄）/%	w（水不溶物）/%	w[钙和镁（以Mg计）]/%	w[氯化物（以Cl计）]/%	w [铁（Fe）]/%	w （水分）/%	白度（R457）/%	pH（50 g/L水溶液,25℃）	w （Na₂SO₃）/%	w （Na₂CO₃） /%
改造前	86.3	0.08	—	0.03	0.035	0.57	65	8.6	11.5	0.6
改造后	98.4	0.09	—	0.03	0.005	0.42	82	7.5	0.5	0.4

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