Influence of CuSO4 on SCN- precipitation effect and coexisting ions concentration in cyanide waste water

doi:10.11949/0438-1157.20190504

Abstract

Abstract:

In view of the environmental pollution caused by SCN^- accumulation and efflux in the process of cyanide waste water recycling, CuSO₄ was used as a precipitant to treat cyanide waste water bearing SCN^-. The effects of precipitant dosage, precipitation time and precipitation temperature on SCN^- precipitation effect and coexisting ion concentration were investigated. The results show that the SCN^-precipitation rate is up to 87.5% when 1.6 times the chemical reaction amount of CuSO₄ is added into it at the room temperature for stirring 60 min, the concentration of T_Cu, S₂O₃ ^2-and SO₃ ^2-is sharply reduced. At the same time, the purity of CuSCN products with more than 97% is obtained. Part of SO₄ ^2- is precipitated after the waste water only need neutralized by lime, its activity is further restored and the treated water could be directly returned to the concentrate leaching process and the remaining CN^- in it is fully used, the toxic cyanide water recycling is realized.

Key words: cyanide waste water, recycling, accumulation, pollution, precipitation, coexisting ions, recovery

摘要：

针对氰化提金贫液循环利用过程SCN^-积累以及外排带来的环境污染问题，以CuSO₄作为沉淀剂处理某高浓度SCN^-贫液，考察了沉淀剂用量、沉淀时间及沉淀温度对SCN^-沉淀效果和对共存离子浓度的影响。结果表明，当在贫液中加入1.6倍化学反应计量的CuSO₄后于室温搅拌60 min，SCN^-的去除率达87.5%以上，体系中T_Cu、S₂O₃ ^2-和SO₃ ^2-浓度也大幅降低，同时得到纯度达97%以上的CuSCN产品。沉SCN^-后的贫液只需石灰中和并沉部分SO₄ ^2-后，其活性得到进一步恢复，可直接返回金精矿浸出工序充分利用其中的CN^-，实现提金贫液的循环利用。

关键词: 提金贫液, 循环, 积累, 污染, 沉淀, 共存离子, 回收

CLC Number:

X 753

Xiao e DANG, Minchao HUAI. Influence of CuSO₄ on SCN^- precipitation effect and coexisting ions concentration in cyanide waste water[J]. CIESC Journal, 2020, 71(3): 1310-1316.

党晓娥, 淮敏超. CuSO₄对氰化提金贫液中SCN^-的沉淀效果以及对共存离子浓度的影响[J]. 化工学报, 2020, 71(3): 1310-1316.

Figures/Tables 7

Table 1 Ions concentration in water before and after precipitation copper

项目

Cu/

(g/L)

SCN^-/

(g/L)

Zn/

(g/L)

Fe/

(mg/L)

S₂O₃ ^2-/(mg/L)

Fig.1 Effect of CuSO4 dosage on Cu and Zn concentration

Fig.2 Effect of CuSO4 dosage on ions concentration and pH

Fig.3 Effect of precipitation time on ions concentration

Fig.4 Effect of precipitation temperature on ions concentration

Table 2 Ions concentration in water after SCN-precipitated with CuSO4

项目

T_Cu/(mg/L)

Zn/(g/L)

SCN^-/

(g/L)

S₂O₃ ^2-/(mg/L)

Fig.5 XRD patterns of precipitate

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Influence of CuSO₄ on SCN^- precipitation effect and coexisting ions concentration in cyanide waste water

CuSO₄对氰化提金贫液中SCN^-的沉淀效果以及对共存离子浓度的影响

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