固液两相耦合条件下全尾砂连续沉降规律研究

doi:10.11872/j.issn.1005-2518.2019.06.896

Abstract

Abstract:

The technology of unclassified tailings high concentration backfilling has been applied to underground mining gradually.Because it has many advantages such as environmental protection，less dehydration，dispose more tailings.The grain size of tailings are getting smaller and smaller with the progress of beneficiation technology. This situation leads to the result of tailings concentration is unsatisfactory. Aiming at the difficulty of concentrating the super fine tailings of a lead-zinc mine in Jiangxi，this study explored the feasibility of adding flocculant to improve its concentration effect.On the basis of physical and chemical properties analysis for solid-liquid two phase coupling respectively under the condition of static and dynamic flocculation settlement of orthogonal test，we determine the tail slurry flocculating settling velocity in the enrichment，and by using the MATLAB software carry on the regression analysis of experimental data for the selection and dosage of flocculant，which provides the basis for the determination of optimal concentration of diluted slurry.Firstly，varieties and dosage of flocculants were determined through static natural settlement tests.Secondly，dynamic flocculation settling tests were conducted according to the varieties and dosage of flocculants that determined before.The influence of feeding speed to the clarity degree of overflow water and the underflow concentration were tested.The experimental results show that the feeding speed by 0.89 t/(m²·h) reduced to 0.60 t/(m²·h)，overflow water solid content gradually decreased，when the feed concentration 13.59%，the concentration of the AH-910-SH type flocculant is 20 g/t，the feeding speed is 0.60 t/(m²·h)，the underflow concentration reached a maximum of 72.82%，the overflow water solid content is 162.68×10^-6 （<300×10^-6），the superfine all backfilling flocculation sedimentation effect is best.This test provided theoretical basis to the rapid settlement technology of ultra-fine unclassified tailings.Thus，the test established the technical foundation of high concentration backfilling of ultra-fine unclassified tailings.The results of the study have certain significance for the application of continuous settlement technology of unclassified tailings.

Key words: unclassified tailings slurry, settlement law, solid-liquid coupling, flocculant, feeding speed, mining with backfill

CLC Number:

TD853.34

Qian KANG,Yunmin WANG,Yan HE,Xilong XUE,Chuxuan ZHANG. Experimental Study on Continuous Settlement Law Under Solid-Liquid Two Phase Coupling Conditions of Unclassified Tailings[J].Gold Science and Technology, 2019, 27(6): 896-902.

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粒径/μm	占比/%	粒径/μm	占比/%
250	1.11	-75~+45	12.73
-250~+150	14.76	-45~+37	4.31
-150~+75	15.29	-37	51.80

参数	数值	参数	数值
比重	2.85	水上休止角/（°）	38.5
密度/(t·m^-3)	2.71	水下休止角/（°）	28.0
渗透系数/(cm·s^-1)	3.86×10^-6

指标名称	不同压力（kPa）范围下的指标取值
指标名称	0~50	50~100	100~200	200~400
压缩系数	2.75	0.69	0.58	0.22
压缩模量/MPa	0.26	1.12	1.43	3.48

元素	质量分数/%	元素	质量分数/%
O	48.400	S	2.987
Mg	0.294	K	3.316
Al	10.830	Fe	3.457
Si	27.580	Pb	0.017

给料速度/（t·m^-2·h^-1）	底流浓度/%	泥层上升速度/（m·h^-1）	溢流水上升速度/（m·h^-1）	溢流水固含量/（mg·L^-1）
0.3	61.43	0.38	3.19	98
0.4	59.38	0.66	4.19	136
0.5	57.79	0.71	5.22	184
0.6	55.46	0.97	6.00	223
0.7	54.10	1.75	7.20	281
0.8	51.37	1.95	8.18	364
0.9	48.72	2.01	9.73	475

Experimental Study on Continuous Settlement Law Under Solid-Liquid Two Phase Coupling Conditions of Unclassified Tailings

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