陇南紫金难处理金精矿工艺矿物学研究

doi:10.11872/j.issn.1005-2518.2019.06.950

Abstract

Abstract:

Refractory gold ore is a kind of gold ore which can not be effectively extracted by conventional cyanidation process after fine grinding.High-sulfur ore is the most common refractory gold deposit in China.Refractory gold concentrate is an enrichment of gold grades greater than 10×10^-6 obtained by fine grinding re-election or flotation of refractory gold ore.In view of the complex mineral composition of refractory gold concentrate with high sulphur content and the characteristics that gold is often encapsulated in other minerals，the process mineralogy of a gold concentrate in Longnan Zijin was studied by means of multielement analysis，X-ray diffraction，mineral dissociation analysis and scanning electron microscopy.The mineral composition，the occurrence state of various phases and the associated law of gold were thoroughly analyzed，to provide theoretical basis for the selection of gold extraction process for gold concentrates.The results show that the S and As contents of the gold concentrate are 42.12% and 2.31% respectively，and the proportion of gold encapsulated by sulfide is 56.19%.The gold concentrate belongs to the refractory gold deposit encapsulated by sulfide.The main gangue in the gold concentrate are quartz and sericite.The main metal minerals in the gold concentrate are natural gold，silver-gold ore，pyrite and arsenopyrite，of which pyrite accounts for 79.6% and is the main carrier of gold minerals.The content of pyrite and arsenopyrite increased from 63.83% and 1.77% to 82.95% and 4.85% respectively，while the content of quartz and sericite decreased from 23.57% and 8.37% to 5.91% and 4.97%，respectively，when the particle size of the gold concentrate decreased from +0.075 mm to -0.045 mm.The size of gold minerals ranges from 1 to 10 microns，the Au content in gold minerals is 74% to 89%，the Ag content is 9% to 23%，and the Fe content is 1% to 9%.The main gold minerals are silver and gold deposits，accounting for 86.67%.In addition，there are a small amount of natural gold，accounting for 13.33%.The liberation degree of gold minerals is 30%.The encapsulated gold minerals are associated with pyrite，which is semi-encapsulated or completely encapsulated，and the encapsulated gold often occurs in the pores of pyrite grains.The degree of monomer dissociation of gold minerals increases with the decrease of sample size.That is，the regrinding of concentrate is beneficial to the exposure of gold particles，making gold particles fully contact the leaching solution，thus improving the leaching rate of gold.

Key words: high sulfur and arsenic, refractory gold deposit, gold concentrate, liberation degree, process mineralogy

CLC Number:

TD926

Xionghui XIE. Study on Technological Mineralogy of Gold Concentrate in Longnan Zijin[J].Gold Science and Technology, 2019, 27(6): 950-956.

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元素	w（B）/%	元素	w（B）/%	元素	w（B）/%
Au^*	18.64	MgO	0.62	Cu	0.051
As	2.31	Ag^*	18.00	Pb	0.20
TS	42.12	SiO₂	11.42	Cr	0.008
CaO	0.47	Al₂O₃	3.20	有机碳	0.14
Fe	36.04	Zn	0.18
TC	0.40	Cd^*	0.20

硫物相	含量/%	占比/%
S⁶⁺	0.14	0.34
S^2-	39.08	93.96
其他硫	2.37	5.70
总硫	41.59	100.00

矿物名称	矿物在原矿和不同粒级金精矿中的质量分数
矿物名称	原金精矿样	+0.075 mm	-0.075~+0.045 mm	-0.045 mm
合计	100.00	100.00	100.00	100.00
黄铁矿	79.60	63.83	80.34	82.95
毒砂	3.80	1.77	2.48	4.85
黄铜矿	0.12	0.03	0.04	0.18
黝铜矿	0.02	0.01	0.01	0.03
闪锌矿	0.35	0.28	0.27	0.40
方铅矿	0.12	0.09	0.11	0.14
赤铁矿、褐铁矿	0.08	0.14	0.10	0.05
自然金、银金矿	微量	微量	微量	微量
石英	9.69	23.57	10.93	5.91
绢云母	5.24	8.37	4.18	4.97
长石	0.08	0.10	0.20	0.02
碳酸盐	0.87	1.67	1.29	0.50
磷灰石	0.03	0.13	0.06	-

粒级/mm	占比/%
粒级/mm	黄铁矿	毒砂
合计	100.00	100.00
+0.075~-0.147	1.45	-
+0.044~-0.075	19.99	7.63
+0.02~-0.044	32.07	34.12
+0.01~-0.02	24.19	30.82
-0.01	22.29	27.43

矿物名称	占比/%
矿物名称	解离单体	与毒砂连生	与脉石连生	与黄铁矿连生
黄铁矿	85	0.6	14.4	-
毒砂	75	-	15	10

Study on Technological Mineralogy of Gold Concentrate in Longnan Zijin

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