基于静态沉降试验的全尾砂浓密技术参数预测

doi:10.11872/j.issn.1005-2518.2021.02.172

Abstract

Abstract:

At present，most of the researches on the thickening performance of tailings are macro researches，and the focus of the research is to improve the settlement performance parameters of mortar by using certain agents，technical means or methods. However，there is no micro research and no in-depth study on what causes the great difference in the thickening properties between different tailings. At present，there is no systematic study on the influence of density and particle size on solid flux and underflow concentration. This paper tries to analyze the main factors affecting the flocculation thickening effect by doing a large number of static sedimentation tests，and to study the quantitative relationship between the technical parameters of full tailing mortar thickening and the physical properties of tailings. Therefore，the particle size composition and density of the tailings of nine metal mines were measured first，and then the flocculation sedimentation tests of the whole tailings of these nine metal mines were carried out. The optimal pulp dilution concentration，underflow concentration，flocculant type，flocculant dosage and tailings throughput per unit area of the 9 typical mines were obtained. The results show that the underflow concentration of slurry，the change of slurry concentration and the amount of flocculant required for sedimentation test are only related to the particle size of tailings，and have nothing to do with the density of tailings. The coarser the particle size is，the higher the underflow concentration is，and the less flocculant dosage is required for the test. The larger the particle size and density of tailings are，the higher the solid flux is. Furthermore，the mathematical relationship between the factors was fitted by the dimensionless regression analysis method，and the relationship equation between the median particle size of tailings and underflow concentration was obtained，the relationship equation between the control particle size of tailings and the concentration change was obtained，and the relationship equation between the particle size，density，concentration and solid flux was obtained. Comparing the calculation results with the test results，it is found that the difference between the predicted value and the test value is very small，which proves that the derived relationship equation is convenient and feasible，and has a good application value.

Key words: densely parameters, flocculation and settling, underflow concentration, solid flux, regression analysis, particle size of tailings

CLC Number:

TD853

Qi LIU,Youhua CEN,Dongrui LIU,Weibing LUO,Xi XU. Prediction of Technical Parameters of Full Tailings Thickening Based on Static Settlement Test[J].Gold Science and Technology, 2021, 29(2): 266-274.

Figures/Tables 9

Table 1

Fig.1

Table 2

Slurry settlement under different dosage of flocculant in mine 3"

料浆浓度 /%	沉降时间	絮凝剂添加量为20 g/t				絮凝剂添加量为30 g/t				絮凝剂添加量为40 g/t
料浆浓度 /%	沉降时间	体积 /mL	沉降高度/cm	密度 /（g·cm^-3）	浓度 /%	体积 /mL	沉降高度/cm	密度 /（g·cm^-3）	浓度 /%	体积 /mL	沉降高度/cm	密度 /（g·cm^-3）	浓度 /%
15.6	0 s	1 000	0	1.100	15.6	1 000	0	1.100	15.6	1 000	0	1.100	15.6
	20 s	760	6.91	1.131	20.0	600	11.52	1.166	24.5	700	8.64	1.142	21.5
	40 s	560	12.67	1.178	26.0	480	14.98	1.208	29.6	540	13.25	1.185	26.8
	60 s	490	14.69	1.203	29.1	430	16.42	1.232	32.4	470	15.26	1.212	30.1
	2 min	400	17.28	1.249	34.3	380	17.86	1.262	35.8	400	17.28	1.249	34.3
	4 min	340	19.01	1.293	39.0	330	19.3	1.302	39.9	340	19.01	1.293	39.0
	6 min	314	19.76	1.318	41.5	310	19.87	1.322	41.9	310	19.87	1.322	41.9
	8 min	297	20.25	1.336	43.3	300	20.16	1.332	42.9	296	20.28	1.337	43.4
	10 min	288	20.51	1.346	44.3	294	20.33	1.339	43.6	291	20.42	1.343	43.9
12.7	0 s	1000	0	1.08	12.7	1 000	0	1.08	12.7	1 000	0	1.08	12.7
	20 s	670	9.5	1.119	18.3	500	14.4	1.159	23.7	510	14.11	1.156	23.3
	40 s	450	15.84	1.177	25.9	370	18.14	1.215	30.5	390	17.57	1.204	29.2
	60 s	382	17.8	1.209	29.7	330	19.3	1.242	33.5	350	18.72	1.228	31.9
	2 min	300	20.16	1.266	36.1	279	20.76	1.286	38.2	298	20.22	1.267	36.3
	4 min	260	21.31	1.307	40.4	248	21.66	1.321	41.8	260	21.31	1.307	40.4
	6 min	238	21.95	1.335	43.2	238	21.95	1.335	43.2	240	21.89	1.332	42.9
	8 min	232	22.12	1.344	44.0	233	22.09	1.342	43.9	238	21.95	1.335	43.2
	10 min	231	22.15	1.345	44.1	231	22.15	1.345	44.1	237	21.97	1.336	43.3
9.7	0 s	1 000	0	1.06	9.7	1 000	0	1.06	9.7	1 000	0	1.06	9.7
	20 s	550	12.96	1.109	16.9	320	19.58	1.187	27.1	360	18.43	1.166	24.5
	40 s	340	19.01	1.176	25.7	280	20.74	1.213	30.3	310	19.87	1.193	27.8
	60 s	290	20.45	1.206	29.4	258	21.37	1.232	32.4	270	21.02	1.221	31.2
	2 min	230	22.18	1.26	35.5	225	22.32	1.266	36.1	223	22.38	1.268	36.4
	4 min	199	23.07	1.3	39.7	200	23.04	1.299	39.6	199	23.07	1.3	39.7
	6 min	185	23.47	1.323	42.0	190	23.33	1.314	41.2	185	23.47	1.323	42.0
	8 min	179	23.64	1.334	43.1	182	23.56	1.328	42.5	179	23.64	1.334	43.1
	10 min	174	23.79	1.343	44.0	182	23.59	1.33	42.5	174	23.79	1.343	44.0
6.7	0 s	1 000	0	1.041	6.7	1 000	0	1.041	6.7	1 000	0	1.041	6.7
	20 s	300	20.16	1.135	20.5	260	21.31	1.156	23.2	280	20.74	1.145	21.8
	40 s	210	22.75	1.193	27.8	200	23.04	1.203	29.0	200	23.04	1.203	29.0
	60 s	190	23.33	1.213	30.2	180	23.62	1.225	31.6	170	23.9	1.238	33.1
	2 min	170	23.9	1.238	33.1	160	24.19	1.253	34.8	160	24.19	1.253	34.8
	4 min	150	24.48	1.27	36.6	147	24.57	1.276	37.2	145	24.62	1.279	37.6
	6 min	140	24.77	1.289	38.6	141	24.74	1.287	38.4	140	24.77	1.289	38.6
	8 min	139	24.8	1.292	38.8	140	24.77	1.289	38.6	139	24.8	1.292	38.8
	10 min	138	24.83	1.294	39.1	139	24.8	1.292	38.8	138	24.83	1.294	39.1

Table 2

Fig.2

Fig.3

Fig.4

Fig.5

Fig6

Table 3

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矿山编号	密度γ /（g·cm^-3）	粒径/mm		最佳矿浆稀释浓度C₀/%	底流浓度C₁/%	最佳絮凝剂类型	絮凝剂单耗 /（g·t^-1）	固体通量 q_t/（t·m^-2·h^-1）
矿山编号	密度γ /（g·cm^-3）	中值粒径d₅₀	控制粒径d₆₀	最佳矿浆稀释浓度C₀/%	底流浓度C₁/%	最佳絮凝剂类型	絮凝剂单耗 /（g·t^-1）	固体通量 q_t/（t·m^-2·h^-1）
矿山1	2.010	0.0282	0.0391	17.5	53.1	AG9020	20.000	2.75
矿山2	2.611	0.0335	0.0423	14.0	53.5	83376	20.000	4.30
矿山3	2.322	0.0217	0.0302	10.1	42.7	83376	30.000	3.65
矿山4	2.871	0.0492	0.0625	16.5	59.5	83376	10.000	5.95
矿山5	2.880	0.0443	0.0540	13.2	55.3	6013S	15.000	5.47
矿山6	2.560	0.0548	0.0723	14.0	59.3	AG9020	10.000	4.76
矿山7	2.689	0.1088	0.1407	16.7	68.0	76	10.000	6.68
矿山8	2.451	0.1012	0.1288	14.0	64.7	AG6025	10.000	5.30
矿山9	3.009	0.0847	0.1055	16.7	63.8	83376	7.500	7.27

矿山编号	真密度 /（g·cm^-3）	中值粒径d₅₀	控制粒径d₆₀	底流浓度/%			单位面积尾砂通过量/（t·m^-2·h^-1）
矿山编号	真密度 /（g·cm^-3）	中值粒径d₅₀	控制粒径d₆₀	试验值	计算值	相对误差	试验值	计算值	相对误差
矿山1	1.010	0.0282	0.0391	53.1	50.35	5.18	2.75	2.74	0.54%
矿山2	1.611	0.0335	0.0423	53.5	53.81	0.58	4.30	4.30	0.05%
矿山3	1.322	0.0217	0.0302	42.7	44.06	3.18	3.65	3.63	0.62%
矿山4	1.871	0.0492	0.0625	59.5	58.58	1.55	5.95	5.61	5.67%
矿山5	1.880	0.0443	0.0540	55.3	57.70	4.35	5.47	5.31	2.85%
矿山6	1.560	0.0548	0.0723	59.3	59.22	0.13	4.76	4.96	4.30%
矿山7	1.689	0.1088	0.1407	68.0	67.26	1.10	6.68	6.64	0.63%
矿山8	1.451	0.1012	0.1288	64.7	66.22	2.34	5.30	5.52	4.21%
矿山9	2.009	0.0847	0.1055	63.8	62.79	1.59	7.27	7.34	0.91%

Prediction of Technical Parameters of Full Tailings Thickening Based on Static Settlement Test

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