重金属在水泥窑协同处置的净浆硬化体中的分布及形态

doi:10.19964/j.issn.1006-4990.2021-0687

Abstract

Abstract:

A three?stage four?step extraction method（BCR） proposed by European Community Bureau of Reference.The distribution and speciation of heavy metals in the hardened solids of waste incineration fly ash and net slurry co?disposed by cement kiln were analyzed.The trend of speciation transformation of heavy metals with hydration reaction was studied.The results showed that the heavy metals were mainly distributed in Ca（OH）₂，calcium silicate hydrate（C-S-H），ettringite（AFt） and unhydrated cement clinker.As the hydration reaction going on，Zn，Cu，Cr，Cd and Mn all had a tendency to transform into forms with strong migration ability，among which Cr and Cd had an obvious tendency.Compared with fly ash from MSW incineration，the proportion of heavy metals with strong migration ability decreased significantly after calcination and hydration in cement kiln.

Key words: coordinated disposal of cement kiln, fly ash, three?stage four?step extraction method, heavy metals

CLC Number:

TQ132.4

LEI Ming,ZHU Hanyu,LIU Zilong,CHEN Guopeng,YUAN Junsheng. Distribution and speciation of heavy metals in hardened solid of net slurry co?disposed by cement kiln[J]. Inorganic Chemicals Industry, 2022, 54(8): 107-113.

Figures/Tables 12

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重金属元素	含量/（mg·kg^-1）	重金属元素	含量/（mg·kg^-1）
Zn	1 672.73	Mn	281.90
Cu	195.95	Cd	27.26
Cr	243.67

化学结合态	提取剂	操作条件
弱酸提取态（AF）	0.11 mol/LCH₃COOH 40 mL	22 ℃翻转振荡（30 r/min）16 h 4 000 r/min离心15 min；取上清液过滤待测，残留物加水振荡离心洗净
可还原态（RF）	0.11 mol/L NH₂OH·HCl 40 mL（HNO₃调节pH至1.5）	22 ℃翻转振荡（30 r/min）16 h；4 000 r/min离心15 min；取上清液过滤待测，残留物加水振荡离心洗净
可氧化态（OF）	30% H₂O₂10 mL（HNO₃调节pH至2.00~3.85），再次加入30% H₂O₂10 mL（HNO₃调节pH至2.00~3.85），1 mol/L NH₄Ac 50 mL（HNO₃调节pH至2）	22 ℃搅拌均匀，静置1 h；（85±2） ℃水浴，偶尔振荡；22 ℃翻转振荡（30 r/min） 16 h；4 000 r/min离心15 min；取上清液过滤待测，残留物加水振荡离心洗净
残渣态（ResF）	HCl+HNO₃+HClO₄全量消解	微波消解

重金属	含量/（mg·kg^-1）						回收率%
重金属	AF	RF	OF	ResF	BCR总计	微波消解	回收率%
Zn	0.52	0.19	87.60	511.30	599.61	637.75	94.02
Cu	0.67	1.02	5.97	30.15	37.81	39.30	96.21
Cr	0.05	0.09	6.07	21.11	27.32	29.00	94.21
Mn	0.00	0.14	63.80	496.13	560.07	535.00	104.69
Cd	0.22	0.16	0.85	0.92	2.15	1.90	113.16

项目	w（Ca）/%	w（Si）/%	w（Al）/%
水泥净浆	74.31	12.88	3.70
一级提取	71.54	14.43	4.32
二级提取	57.40	23.26	5.43
三级提取	19.11	52.20	7.38

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Inorganic Acid-Base-Salt Committee of CIESC

Distribution and speciation of heavy metals in hardened solid of net slurry co?disposed by cement kiln

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