Industrial waste utilization method: producing poly-ferric sulfate (PFS) from sodium-jarosite residue

doi:10.1007/s11783-014-0687-4

Front. Environ. Sci. Eng.

2015, Vol. 9

Issue (4) : 731-737 https://doi.org/10.1007/s11783-014-0687-4

RESEARCH ARTICLE

Industrial waste utilization method: producing poly-ferric sulfate (PFS) from sodium-jarosite residue

Zhongguo LI^1,^*(

),Wenyi YUAN²

1. College of Earth and Environmental Science, Lanzhou University, Lanzhou 730000, China
2. School of Environment, Tsinghua University, Beijing 100084, China

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Abstract

Sodium-jarosite is a type of industrial waste that results from hydrometallurgy and inorganic chemical production. The iron content of jarosite residue may be utilized to produce theoretically the ferrous materials. The difficulty in production of high quality poly-ferric sulfate (PFS) is how to remove impurities contained in jarosite residue. This paper proposes a novel method for disposing sodium-jarosite which can be used to synthesize PFS, a very important reagent for treating waste water. The method consists of a two-step leaching experimental procedures. The first step, pre-leaching process, is to remove impurity metals by strictly controlling the leaching conditions. The acid concentration of acidic water was adjusted according to the content of impurity metals in sodium-jarosite and the leaching temperature was controlled at 25°C. The second step is to decompose sodium-jarosite to provide enough ferric ions for synthesizing PFS, the concentrated sulfuric acid consumption was 0.8 mL·g^-1 sodium-jarosite and the leaching temperature was above 60°C. In the experiment, decomposing iron from sulfate sodium-jarosite can take the place of ferric martials for synthesizing PFS. Results show that the PFS synthesized from sodium-jarosite had a high poly-iron complex Fe_4.67(SO₄)₆(OH)₂·20H₂O. Further, the PFS product’s specifications satisfied the national standard of China.

Keywords sodium-jarosite residue utilization poly-ferric sulfate (PFS)

Corresponding Author(s): Zhongguo LI

Online First Date: 25 March 2014 Issue Date: 25 June 2015

Cite this article:

Zhongguo LI,Wenyi YUAN. Industrial waste utilization method: producing poly-ferric sulfate (PFS) from sodium-jarosite residue[J]. Front. Environ. Sci. Eng., 2015, 9(4): 731-737.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-014-0687-4
https://academic.hep.com.cn/fese/EN/Y2015/V9/I4/731

Tab.1 Chemical composition (% dry weight) of jarosite residues samples

Fig.1 Changes in leaching rate of Fe with temperature

Fig.2 Composition of leaching residue analysis by XRD

Fig.3 Changes in basicity of PFS with the n(OH^-)/n(Fe³⁺)

Fig.4 Changes in basicity of PFS with temperature

Fig.5 Changes in basicity of PFS with reaction time

Tab.2 Measurable quality index of PFS product

Fig.6 XRD Patterns comparison of PFS produced from Green vitriol and from sodium-jarosite: (a) XRD pattern of PFS synthesized from Green vitriol; (b) XRD pattern of PFS synthesized from sodium-jarosite

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