缅甸实皆省某金矿工艺矿物学研究

doi:10.11872/j.issn.1005-2518.2020.02.094

Abstract

Abstract:

As trade friction between China and the United States escalates，international concerns about the creditworthiness of the United States will have a negative impact on the status of the dollar as a national currency，countries may increase their holdings of gold and demand for gold will increase.Myanmar is one of the most promising countries for China’s direct mining investment.The gold resources in Burma are abundant and widely distributed.At present，there are few reports on the development and utilization of gold mines in Myanmar.It is of great significance to strengthen basic research on overseas mineral resources and avoid technical risks.Mineral development investment risk is bigger due to lack of basic materials of process mineralogy of a gold mine in sagaing province，Myanmar.The chemical composition，mineral composition，particle size distribution，physical phase and dissociation degree of gold and structure of ore were studied by means of X-ray diffraction （XRD），scanning electron microscope （SEM） and chemical analysis to find out the process mineralogy characteristics of a gold mine in Sagaw Province，Myanmar.The results show that the grade of gold is 5.13×10^-6，which is the main valuable element.The ore has autogenous grain structure，block structure，patchy structure and disseminated structure.The mineral composition of the ore is simple，the metal minerals are mainly pyrite （14.75%），a small amount of chalcopyrite，magnetite and porphyry，and the gangue minerals are mainly quartz，plagioclase，calcite，chlorite and white mica.The distribution rate of gold in heavy minerals is 3.94%.Free gold is hornlike，massive，flaky and circular, the fineness of gold is good （more than 93%）.Gold is easy to dissociate.Most of the gold in the non-heavy minerals has been dissociated，the distribution rate of free gold is 92.68%.The distribution rate of gold parcel is 3.38%.The monomer dissociation degree of fine-grained gold is also relatively high.In the -0.074 mm grain size，The monomer gold content is 98.72%，the adherent-gold content is 1.28%.After 60 h of full-mud cyanidation，the gold leaching rate reached 90.19%，which was close to the rule of gold monomer dissociation degree in the gold mine.It is necessary to continue to strengthen the research on the theory and technology of selecting and metallurgy of a gold mine in shijie province and improve its technical and economic indexes.

Key words: Myanmar, gold mine, process mineralogy, sulfide, mineral liberation

CLC Number:

TF11

Kaibin FU,Weiqing WANG,Taotao ZHAO,Meiqiao LONG,Puyao HOU,Mingxia DU. Mineralogical Characterization of a Gold Ore in Sagaw Province，Myanmar[J].Gold Science and Technology, 2020, 28(2): 278-284.

Figures/Tables 8

Table 1

Table 2

Table 3

Fig.1

Table 4

Fig.2

Table 5

Determination results of dissociation degree of gold monomer"

粒级/mm	单体占比/%	连生体
		连生体占比/%	连生关系占比/%		连生体体积（V）大小分布率/%
		连生体占比/%	脉石	金+脉石	V> $34$	$34$ >V> $12$	$12$ ≥V> $14$	V< $14$
+0.42	0	100	99.51	0.49	-	-	6.23	93.77
-0.42～+0.096	32.56	67.44	99.34	0.66	0.54	2.54	6.54	90.38
-0.096～+0.074	96.73	3.27	99.21	0.79	16.54	18.97	25.87	38.62
-0.074	98.72	1.28	99.56	0.44	22.54	32.47	38.54	6.45

Table 5

Fig.3

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化学成分	质量分数	化学成分	质量分数
SiO₂	47.65	P₂O₅	0.29
Fe₂O₃	10.38	MnO	0.16
Al₂O₃	13.36	Cr₂O₃	0.09
CaO	11.37	Co₃O₄	0.06
SO₃	7.67	BaO	0.05
MgO	3.34	ZrO₂	0.02
NaO	3.22	Au*	5.13
K₂O	1.45	C	<0.05
TiO₂	0.99	As	<0.05

金属矿物	分子式	质量分数	脉石矿物	分子式	质量分数
黄铁矿	FeS₂	14.75	石英	SiO₂	31.53
黄铜矿	CuFeS₂	少量	斜长石	Na[AlSi₃O₈]-Ca[Al₂Si₂O₈]	18.73
磁铁矿	Fe₃O₄	少量	方解石	CaCO₃	13.43
斑铜矿	Cu₅FeS₄	少量	绿泥石	Y₃（Z₄O₁₀）（OH）₂·Y₃（OH）₆	8.47
自然金	Au	<0.01	白云母	KAl₂（AlSi₃O₁₀）（OH）₂	9.79
其他金属矿物		3.3

矿相		金品位/×10^-6	分布率/%
单体金	粗颗粒单体金	0.30	10.87
	微细单体金	4.40	85.75
	总单体金	3.94	96.62
包裹金	碳酸盐包裹金	0.0077	0.15
	石英和硅酸盐矿物包裹金	0.012	0.24
	硫化矿包裹金	0.15	2.99
	褐铁矿包裹金	0.00	0.00
	总包裹金	0.13	3.38
合计		4.07	100.00

-0.074 mm含量占比/%	筛析粒级/mm	产率/%	品位/×10^-6	金分布率/%	金累计分布率/%
70	+0.165	5.63	5.12	5.30	5.30
	-0.165～+0.074	25.19	5.37	24.84	30.14
	-0.074～+0.038	27.84	5.26	26.9	57.04
	-0.038～+0.025	21.66	5.55	22.1	79.14
	-0.025	19.68	5.77	20.86	100.00
	原矿	100	5.44	100	-
80	+0.165	5.46	5.34	5.30	5.30
	-0.165～+0.074	13.49	5.19	12.81	18.11
	-0.074～+0.038	28.84	5.39	28.43	46.54
	-0.038～+0.025	24.66	5.79	26.11	72.65
	-0.025	27.55	5.43	27.35	100.00
	原矿	100	5.47	100	-
90	+0.165	4.85	5.54	4.84	4.84
	-0.165～+0.074	5.27	5.66	5.37	10.21
	-0.074～+0.038	29.37	5.37	28.38	38.59
	-0.038～+0.025	28.81	5.32	27.58	66.17
	-0.025	31.7	5.93	33.83	100.00
	原矿	100	5.56	100	-

Mineralogical Characterization of a Gold Ore in Sagaw Province，Myanmar

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