高化学需氧量工业废盐炭化除杂及精制工艺研究

doi:10.19964/j.issn.1006-4990.2022-0669

Abstract

Abstract:

Removal of organic pollutants in high COD industrial waste salt by carbonization was studied，and the purification of waste salt was realized.The effects of carbonization atmosphere，carbonization reaction temperature，reaction time，material layer thickness and waste salt moisture content on the removal of organics and the morphology of carbonized salts were investigated.When raw waste salt was with water soluble COD of 6 680 mg/kg and water content of 0.85%，the orthogonal experiment results showed that the carbonization temperature had a higher significant value for the removal of carbonized organics than the carbonization reaction time，carbonization atmosphere and material layer thickness.The results of single factor experiment showed that the average residual amount of water-soluble COD was 87.36 mg/kg，and the removal rate could reach more than 98% under the conditions of air atmosphere，carbonization temperature of 575 ℃，thickness of 25 mm，and carbonization time of 1 h.At the same time，the chromaticity value of 20% salt solution was reduced from 975.4 to 13.5，and the sodium sulfate product obtained through purification and refining met the class I first grade standard of Industrial Anhydrous Sodium Sulfate（GB/T 6009—2014）.

Key words: industrial waste salt, organic pollutant, carbonization, COD, recovery, sodium sulfate

CLC Number:

TQ131.12

ZHOU Zhaoan, LI Jun, LIU Xiaowen, ZHOU Aiqing, MAO Anzhang. Study on carbonization and purification process of high COD industrial waste salt[J]. Inorganic Chemicals Industry, 2023, 55(9): 100-105.

Figures/Tables 17

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References 11

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	炭化气氛	反应温度/°C	停留时间/h	料层厚度/mm	水溶性COD去除率/%
1	空气	400	1	15	89.22
2	空气	500	2	25	94.31
3	空气	600	3	35	100.00
4	还原	400	2	35	81.44
5	还原	500	3	15	94.61
6	还原	600	1	25	99.70
7	惰性（N₂）	400	3	25	87.57
8	惰性（N₂）	500	1	35	92.66
9	惰性（N₂）	600	2	15	99.55

因素水平分析	因素
因素水平分析	炭化气氛	炭化温度	炭化时间	料层厚度
影响显著值由大到小依次为	炭化温度、料层厚度、炭化气氛、炭化时间
K1	283.533	258.234	281.587	283.383
K2	275.749	281.587	275.299	281.587
K3	279.790	299.251	282.186	274.102
k1	94.511	86.078	93.862	94.461
k2	91.916	93.862	91.766	93.862
k3	93.263	99.750	94.062	91.367
R（K）	7.784	41.018	6.886	9.281

炭化温度/℃	炭化盐白度/%	实验现象
500	11.2	未结块
525	15.5	未结块
550	22.5	未结块
575	27.1	未结块
600	39.2	少量结块，稍硬
625	未检测	烧融并结块

料层厚度/mm	炭化盐白度/%	实验现象
15	28.2	未结块
25	27.1	未结块
35	24.6	未结块
45	25.2	未结块
55	25.1	未结块

炭化时间/h	炭化盐白度/%	实验现象
0.5	10.4	未结块
1.0	27.1	未结块
1.5	30.9	未结块
2.0	32.9	未结块
3.0	36.1	未结块

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on carbonization and purification process of high COD industrial waste salt

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废盐含水率/%	炭化盐白度/%	实验现象
0.85	22.9	未结块
5	29.2	未结块
7.5	30.5	无明显结块
10	35.4	极少部分结成较硬块
15	32.1	部分结成较硬块

项目		w（Na₂SO₄）/%	w（水不溶物）/%	w（Ca）/%	w（Mg）/%	w（Cl）/%	w（Fe）/%	w（水分）/%	白度/%
回收盐样品		99.4	0.02	0.008	0.007	0.30	＜0.000 5	0.03	88.7
Ⅰ类	优等品	≥99.6	≤0.005	≤0.01	≤0.01	≤0.05	≤0.000 5	≤0.05	≥88
Ⅰ类	一等品	≥99.0	≤0.05	合计≤0.15		≤0.35	≤0.002	≤0.2	≥82
Ⅱ类	一等品	≥98.0	≤0.1	合计≤0.3		≤0.7	≤0.01	≤0.5	≥82

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