Expert guidance: exchanging views, Gong Meiling, Dai Zheng Guang, Huji You, Gu Zhong-xiang; Project Leader: Zhang World Bank
I. Introduction
Entrusted by Xinjiang XXXXXX Company, Xi'an Tianzhou Mining Technology Development Co., Ltd. conducted an ore selectivity test on Xinjiang XXXX molybdenum ore in July 2008. The purpose is to study the ore selectivity test. The mine provides a set of economically reasonable and technically feasible processes to provide a scientific basis for mine development and utilization.
In the test process, the detailed experimental mineralogy and molybdenum ore X-ray diffraction analysis, chemical multiple analysis and molybdenum phase analysis were carried out on the test samples. The ore type, ore minerals and gangue minerals have been identified, the ore relationship, the ore mineral structure and the embedding characteristics, and the structure of the ore, so that researchers have a comprehensive understanding of the nature of the molybdenum ore. It has played a guiding role in the formulation of the process.
Xinjiang XXXX molybdenum, is a granite porphyry is a type of host rock ore, copper ore minerals are yellow ore, molybdenite, pyrite, sphalerite, ore and crushed rock are strongly altered crack , metal molybdenite minerals were independently mineral phase occurs, sphalerite content is extremely low, but mostly pyrite and symbiotic modalities. The chalcopyrite is all finely granulated, and it is dispersed into its crystal granules. This chalcopyrite is difficult to recycle and affects the grade of molybdenum concentrate. Pyrite is all present in the form of a recrystallized aggregate. The gangue mineral particles are encapsulated in chalcopyrite. The ore preparations are: 0.097% molybdenum, 0.038% copper, and 0.29 g/t gold.
According to the nature of Xinjiang XXXX molybdenum ore, the test uses two kinds of processes, namely copper-reducing molybdenum molybdenum process and copper-molybdenum mixed-re-copper and molybdenum separation process. The closed-circuit index of copper-free molybdenum-molybdenum process is molybdenum concentrate grade. 46.77%, molybdenum recovery rate of 88.80%, copper-molybdenum mixed flotation process open circuit indicators for molybdenum concentrate grade 46.91%, molybdenum recovery rate of 51.05%, copper concentrate grade 3.22%, copper recovery rate of 45.07%. The recommended process is: copper-copper molybdenum process.
Second, the sample is taken and prepared
(1) Adoption of test samples
The adoption of this test sample was taken by XXXXXXXX company. The samples sent for the first time were tested and the grades were low and the representation was not enough. After communicating with XXXXXXXX company, the second sampling was carried out. The second sampling was taken from 24 points and 300kg respectively. The results of each sampling are shown in Table 1. The representativeness of the test sample is the responsibility of the sampling unit.
(2) Preparation of test samples
The test samples of 24 points were crushed separately according to the specifications, and the samples of each point were mixed and taken out for chemical analysis. The process flow of the test sample crushing process is shown in Fig. 1.
After consultation with XXXXXXXX company, the test sample ore molybdenum grade is allocated to about 0.095%-0.10%, and the test sample preparation is shown in Table 2.
Table 1 Second sampling details
Sample number | Sample number | Sample size (kg) | Molybdenum grade (%) |
11 | Y6050 | 11.0 | 0.032 |
12 | Y6056 | 6.5 | 0.056 |
13 | Y7219 | 9.0 | 0.220 |
14 | Y7220 | 10.5 | 0.034 |
15 | Y7029 | 9.0 | 0.094 |
16 | Y7037 | 14.5 | 0.068 |
17 | Y7038 | 14.5 | 0.150 |
18 | Y7039 | 13.0 | 0.065 |
19 | Y7040 | 11.5 | 0.110 |
20 | Y7041 | 11.0 | 0.065 |
twenty one | Y7344 | 11.5 | 0.12 |
twenty two | Y7353 | 12.0 | 0.13 |
twenty three | Y7354 | 12.0 | 0.08 |
twenty four | Y7355 | 13.0 | 0.074 |
25 | Y7356 | 8.5 | 0.087 |
26 | Y7357 | 11 | 0.099 |
27 | Y7244 | 12 | 0.028 |
28 | Y7245 | 3 | 0.030 |
29 | Y7246 | 14.5 | 0.051 |
30 | Y7250 | 14.5 | 0.033 |
31 | Y8100 | 12 | 0.074 |
32 | Y8101 | 12 | 0.062 |
33 | Y7358 | 13 | 0.050 |
34 | Y7359 | 12.5 | 0.15 |
Table 2 Test sample preparation table
Sample number | Sample loading amount (kg) | Molybdenum grade (%) |
Y6056 | 6.5 | 0.056 |
Y7219 | 9.0 | 0.220 |
Y7220 | 10.5 | 0.034 |
Y7029 | 9.0 | 0.094 |
Y7037 | 14.5 | 0.068 |
Y7038 | 14.5 | 0.150 |
Y7039 | 13.0 | 0.065 |
Y7040 | 11.5 | 0.110 |
Y7041 | 11.0 | 0.065 |
Y7344 | 11.5 | 0.12 |
Y7353 | 12.0 | 0.13 |
Y7354 | 12.0 | 0.08 |
Y7355 | 13.0 | 0.074 |
Y7356 | 8.5 | 0.087 |
Y7357 | 11.0 | 0.099 |
Ore grade | | 0.097 |
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Third, the conclusion
(1) Summary of Process Mineralogy Research
Xinjiang XXXX molybdenum ore is a type of ore with granite as the ore-bearing rock. The ore minerals are mainly chalcopyrite, molybdenum, pyrite, sphalerite and ore-bearing rocks, all of which are broken and strongly cracked. Among the metal minerals, molybdenum ore is formed as an independent mineral, and the content of sphalerite is extremely small, but it is symbiotic with pyrite. The chalcopyrite is all fine-grained, accounting for 33.33% of less than 0.048 mm and accounting for 66.67% of less than 0.074 mm. Derived from the nature of the ore, the mine is easy to dressing stone. The occurrence of chalcopyrite is complicated. Some of them are sphalerite inclusions, and some of them are sphalerite. Most of the chalcopyrites appear in the crystallization zone of gangue minerals in a dispersed form, and the particles are very fine. Although chalcopyrite is a recyclable mineral, the recovery of chalcopyrite is also difficult due to the small size of the chalcopyrite particles and the symbiosis with the gangue.
(2) Laboratory test results
According to the nature of the ore, this test uses two processes: copper-suppressing molybdenum process and copper-molybdenum mixing-re-copper-molybdenum separation process. The closed-circuit test index of copper-free molybdenum process is: molybdenum concentrate grade 46.77%, molybdenum recovery rate of 88.80%. Copper-molybdenum mixed flotation and copper-molybdenum separation open circuit test indicators: molybdenum concentrate grade 46.91%, molybdenum recovery rate 51.15%, copper concentrate grade 3.22%, copper recovery rate 45.07%, copper concentrate gold 0.69g / t. Due to the small yield of copper and molybdenum, it is impossible to conduct a closed circuit test.
(3) Suggestion and recommended process
1. This test uses two kinds of process flow test comparisons. The purpose is to recover the molybdenum and make the molybdenum concentrate reach the qualified product and carry out the impurity removal. In addition, we also considered the comprehensive recycling to make the copper in molybdenum waste. The index of molybdenum concentrate obtained by the copper-free molybdenum molybdenum process is 46.77%, and the molybdenum recovery rate is 88.8%. Compared with the same type of mine in China, the index is ideal. In this test, the selection of molybdenum was selected 5 times. It is recommended to use 8-9 times of selection in the design, which will improve the quality of molybdenum products. Through on-site adjustment, the molybdenum grade can be increased to more than 50%. The rate is above 85%.
2. Through the mixed flotation test of copper and molybdenum, copper and molybdenum can be effectively separated. Since the copper in the ore is only 0.038%, and the comprehensive economic analysis has not been achieved, the copper in the mine has no economic recovery value.
3. Therefore, through trial research and comparison, the recommended process is a copper-free molybdenum-molybdenum process.
4. The recommended process is flotation process, mature technology, convenient operation, no toxic and harmful elements, no toxic agents in flotation, tailings water can be returned to the process for full use, no pollution to the environment, tail water can reach “zero†Emissions are environmentally friendly cleaning processes.
(IV) The samples of this test were taken by Jingsha County XXXX Co., Ltd., and the technical personnel were scientifically taken. The representativeness of the samples was good, and the original ore molybdenum grade was 0.097%, which was in line with the geological average grade. Through the test, the molybdenum can be effectively recovered. Therefore, the mine has the value of development and utilization, and this test can be used as the design basis of the concentrator.
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