CN-121995038-A - Quantitative analysis method for occurrence state of gold in ore deposit

Abstract

The invention relates to the technical field of mineral analysis, in particular to a quantitative analysis method for occurrence state of gold in a mineral deposit. The quantitative analysis method for the occurrence state of gold in the ore deposit comprises the steps of preprocessing an ore sample and obtaining the total content of gold in the ore sample. And performing gold super-enrichment treatment on the pretreated ore sample to obtain a super-enriched ore sample. And respectively manufacturing resin targets for the pretreated ore sample and the super-enriched ore sample, and analyzing each resin target by using TIMA. Micro-domain in situ analysis was performed on sulfide resin targets using LA-ICP-MS. The quantitative analysis of the presence status of gold in ore samples was performed in combination with the data obtained from TIMA and LA-ICP-MS analyses. Compared with the traditional qualitative or semi-quantitative method, the scheme has higher resolving power and application universality, is suitable for researching different types of gold deposits, and provides reliable data support for optimizing the subsequent dressing and smelting process.

Inventors

• ZHANG YIFAN
• FAN YU
• JIANG JIAN
• WANG SHIWEI
• XU LONG
• ZHANG LIANG
• Zhou Taofa
• HUA JIAN

Assignees

• 合肥工业大学
• 铜陵有色金属集团股份有限公司矿产资源中心

Dates

Publication Date

20260508

Application Date

20260410

Claims (10)

1. 1. A method for quantitatively analyzing the occurrence status of gold in a deposit, comprising: S1, preprocessing an ore sample and obtaining the total content of gold in the ore sample, and performing gold super-enrichment treatment on the preprocessed ore sample to obtain a super-enriched ore sample, wherein the super-enriched ore sample comprises gold concentrate, sulfide and silicate; S2, respectively manufacturing resin targets for the pretreated ore sample and the super-enriched ore sample, and scanning each resin target by utilizing a mineral automatic quantitative analysis system to obtain the mineral composition of gold-loaded minerals in the pretreated ore sample and the mass fraction of each mineral, and the quantity, the type and the particle size distribution of microscopic gold in the super-enriched ore sample; S3, carrying out micro-region in-situ analysis on the sulfide resin target by utilizing LA-ICP-MS to obtain the gold content of each gold-carrying mineral contained in the sulfide; S4, multiplying the gold content of any gold-bearing mineral by the mass fraction of the corresponding gold-bearing mineral in the ore sample, and dividing the product by the total gold content of the ore sample to obtain the gold ratio of the gold-bearing mineral in the ore sample; S5, repeating the step S4 to obtain the ratio of gold in each gold-carrying mineral in the ore sample, and further respectively obtaining the ratio of lattice gold and microscopic gold in the ore sample, so as to realize quantitative analysis of the occurrence state of gold in the ore sample.
2. 2. The method according to claim 1, wherein the lattice Jin Zhanbi of the ore sample is a sum of the ratios of gold in the gold-bearing minerals, and the ratio of microscopic gold in the ore sample is 1-lattice gold.
3. 3. The quantitative analysis method for occurrence of gold in a deposit according to claim 1, characterized in that the quantitative analysis method for occurrence of gold in a deposit enables quantitative analysis of occurrence of gold in an ore sample having a gold grade of 0.1 g/t.
4. 4. The quantitative analysis method for occurrence of gold in ore deposit according to claim 1, characterized in that the pretreatment process of the ore sample is that the ore sample is subjected to coarse crushing, fine grinding, screening and shrinkage in sequence to obtain a pretreated ore sample, wherein the shrinkage step of the ore sample follows the equation of the formula of the key Qiao Te.
5. 5. The method for quantitatively analyzing the occurrence of gold in a deposit according to claim 4, wherein the kinds of microscopic gold include natural gold, silver gold ore and tellurium gold ore.
6. 6. The quantitative analysis method for occurrence status of gold in ore deposit according to claim 1, wherein the particle size range of the ore sample after coarse crushing is 1-2 cm, the particle size range of the ore sample after fine crushing is 2-5 mm, and 80% of the ore sample after fine grinding can pass through 150 μm sieve.
7. 7. The quantitative analysis method for occurrence status of gold in ore deposit according to claim 1, wherein the process of the super-enrichment treatment is characterized in that gold in an ore sample is pre-enriched based on gravity beneficiation technology, and then the pre-enriched ore sample is elutriated to obtain the super-enriched ore sample, the super-enriched ore sample comprises gold concentrate, sulfide and silicate, wherein the particle number of microscopic gold in the gold concentrate exceeds 95% of the total microscopic gold particle number, and the silicate does not contain microscopic gold.
8. 8. The quantitative analysis method for occurrence of gold in ore deposit according to claim 7, characterized in that during the super-enrichment treatment, gold in ore samples is pre-enriched by using a nielsen concentrator, and pre-enriched ore samples are elutriated by using a super-gold concentrator.
9. 9. The quantitative analysis method for occurrence of gold in ore deposit according to claim 1, wherein the resin target is prepared by sequentially subjecting the pretreated ore sample to cementation and polishing.
10. 10. The quantitative analysis method for occurrence status of gold in ore deposit according to claim 1, wherein the mineral automatic quantitative analysis system adopts a dot matrix scanning mode when scanning a resin target made of a pretreated ore sample and adopts a bright phase searching mode when scanning a resin target made of a super-enriched ore sample.

Description

Quantitative analysis method for occurrence state of gold in ore deposit Technical Field The invention relates to the technical field of mineral analysis, in particular to a quantitative analysis method for occurrence state of gold in a mineral deposit. Background The occurrence states of gold in nature mainly include visible gold, microscopic gold and lattice gold. The research category of Jin Fu states covers the types of gold minerals in ores, the duty ratio characteristics of different types of gold, the granularity parameters of microscopic gold, the types and granularity of gold-bearing minerals and the gold content thereof. Quantitatively finding out the occurrence state of gold in the ore deposit, has important scientific value for revealing the ore forming process and the enrichment mechanism of gold and also has important economic value for later dressing and smelting recovery. However, studies of the occurrence status of gold have long been limited to the category of qualitative descriptions. The research means mainly depends on microscopic identification of a large number of optical sheets, an extra-high grade sample is often required to be selected as a research object in actual operation, so that the sample representativeness is insufficient, meanwhile, the process analysis and test flow is complex, time and labor are consumed, the problems are more prominent for the investigation of the occurrence state of low-grade associated gold in a deposit, and the research difficulty is remarkably increased. Therefore, the current research on the occurrence status of gold is mostly at the qualitative-semi-quantitative (estimation) level, and the accurate quantitative technology of the occurrence status of gold cannot be realized. Many researchers often suggest that gold occurs primarily in the form of lattice gold through observation of light flakes, and this simple qualitative description presents many difficulties in understanding the mechanism of gold enrichment in the deposit and the ore-forming process. Disclosure of Invention The invention provides a quantitative analysis method for occurrence states of gold in a deposit, which aims to solve the technical problem that the quantitative analysis of occurrence states of gold in the deposit is difficult to carry out in the prior art. The quantitative analysis method for the occurrence state of gold in the ore deposit is realized by adopting the following technical scheme that the quantitative analysis method comprises the following steps of S1, preprocessing an ore sample, obtaining the total content of gold in the ore sample, and obtaining a super-enriched ore sample, namely gold concentrate, sulfide and silicate, after performing gold super-enrichment processing on the preprocessed ore sample. S2, respectively manufacturing resin targets for the pretreated ore sample and the super-enriched ore sample, and scanning each resin target by utilizing a mineral automatic quantitative analysis system, so as to obtain the mineral composition of gold-loaded minerals in the pretreated ore sample, the mass fraction of each mineral, and the quantity, the type and the particle size distribution of microscopic gold in the super-enriched ore sample. And S3, carrying out micro-region in-situ analysis on the resin target of the super-enriched sulfide by utilizing LA-ICP-MS to obtain the gold content of each gold-carrying mineral contained in the sulfide. And S4, multiplying the gold content of any gold-bearing mineral by the mass fraction of the corresponding gold-bearing mineral in the ore sample, and dividing the product by the total gold content of the ore sample to obtain the gold duty ratio of the gold-bearing mineral in the ore sample. S5, repeating the step S4 to obtain the ratio of gold in each gold-carrying mineral in the ore sample, and further respectively obtaining the ratio of lattice gold and microscopic gold in the ore sample, so as to realize quantitative analysis of the occurrence state of gold in the ore sample. As a further improvement of the invention, the ratio of the lattice gold in the ore sample is the sum of the ratios of gold in each gold-carrying mineral in the ore sample obtained in the step S5, and the ratio of the microscopic gold in the ore sample is 1-the ratio of the lattice gold. As a further improvement of the invention, the quantitative analysis method of the occurrence state of gold in the ore deposit can quantitatively analyze the occurrence state of gold in an ore sample with gold grade of 0.1 g/t. As a further improvement of the invention, the pretreatment process of the ore sample comprises the steps of sequentially carrying out coarse crushing, fine crushing, screening and shrinkage on the ore sample to obtain the pretreated ore sample, wherein the shrinkage step of the ore sample follows the formula of Qiao Te. As a further improvement of the present invention, the types of microscopic gold include natural gold, silver gold