Experimental Study on Sedimentation and Concentration of Unclassified Tailings

Xinzheng CHEN; Lijie GUO; Wenchen LI; Zongnan LI

doi:10.11872/j.issn.1005-2518.2019.01.105

Gold Science and Technology >

2019 , Vol. 27 >Issue 1: 105 - 111

DOI: https://doi.org/10.11872/j.issn.1005-2518.2019.01.105

Experimental Study on Sedimentation and Concentration of Unclassified Tailings

Xinzheng CHEN ¹^,² ,
Lijie GUO ^,¹^,²^,^* ,
Wenchen LI ¹^,² ,
Zongnan LI ¹^,²

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1. BGRIMM Technology Group，Beijing 102628，China
2. National Center for International Joint Research on Green Metal Mining，Beijing 102628，China

Received date: 2018-03-26

Revised date: 2018-06-23

Online published: 2019-03-19

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Highlights

Back filling method using unclassified tailings is an effective way to realize green mining of metal mines.Sedimentation and concentration of unclassified tailings is the key technology in the full tailings filling.With the improvement of mineral processing technology，the particle size of tailings gets smaller and smaller，which makes the sedimentation and concentration of tailings more difficult.Adding the flocculant to tailings slurry can greatly improve the sedimentation and concentration of tailings.The type of flocculant, the feeding concentration of tailings slurry and the dosage of flocculant added to tailings slurry are important factors that affect the flocculation and sedimentation efficiency of unclassified tailings，which are usually got from the sedimentation concentration test.Aiming at the problem of fine tailings being hard to concentrate in a domestic mine and using solid flux and bottom flow concentration as evaluation indicators，the sedimentation concentration test was carried out.Using the single factor analysis method，four experiments of the flocculant optimization，the optimal feeding concentration selection，the optimal flocculant unit consumption selection and the standard flocculation sedimentation were carried out in turn to get the parameters of flocculant type，feeding concentration and flocculant unit consumption with the best sedimentation and concentration effect.And the influence rules of feeding concentration and flocculant unit consumption on sedimentation and concentration of tailings was studied.The experiment process is simple and easy to operate，and the result is highly reliable.In the flocculant optimization experiment，four different types of anionic flocculant were chosen and they were domestic HJ63016、HJ70010、AL504 and French SNF6013S.In the optimal feeding concentration selection experiment，the concentration of tailings slurry is 6 $%$ ，8 $%$ ，10 $%$ ，12 $%$ ，14 $%$ ，20 $%$ ，25 $%$ and 30 $%$ respectively.In optimal flocculant unit consumption selection experiment，the flocculant unit consumption is 5，10，15，20，25,30 g/t.The results show that the optimum flocculant type is HJ70010，the optimum tailings slurry feeding concentration range is 10 $%$ ~ 12 $%$ ，and the optimum flocculant dosage range is 10 ~ 15 g/t.When the tailings slurry feeding concentration is 12 $%$ ，and the flocculant dosage is 15 g/t，the bottom flow concentration reached 64.4 $%$ ，the sedimentation rate is 43.7 cm/min，and the solid flux is 3.43 t/（h $⋅$ m²）.With the increasing of feeding concentration，the solid flux increased first and then decreased with a parabolic change，and the bottom flow concentration increased first and then gradually stabilized.With the increasing of flocculant unit consumption，the solid flux increased first and then gradually stabilized，and the bottom flow concentration increased first and then decreased with a parabolic change.

Cite this article

Xinzheng CHEN , Lijie GUO , Wenchen LI , Zongnan LI . Experimental Study on Sedimentation and Concentration of Unclassified Tailings[J]. Gold Science and Technology, 2019 , 27(1) : 105 -111 . DOI: 10.11872/j.issn.1005-2518.2019.01.105

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