Optional test of ore in Tongbaoshan copper-molybdenum ore

I. Introduction

Copper and molybdenum are elements that are less distributed in nature. The Duobaoshan copper-molybdenum mine in Heilongjiang is a super-large, low-grade porphyry copper-molybdenum bed with large ore reserves, low grade and shallow burial. Due to the low grade, copper-molybdenum separation has not found a reasonable process. With the development of mineral processing technology, Western Mining Corporation, Fujian Zijin Mining Co., Ltd., Heilongjiang Mining Group Company and other five units strong hand, and common development of multi-Copper, aluminum deposits, assign someone with the beneficiation joint expert Central South University, A selective study on the mine was carried out. After nearly one year of research, a series of small experiments on the mineral was used to finalize a reasonable copper-molybdenum separation process and expand the company based on the completion of the simulation laboratory. Select the test and get better results.

Second, the nature of the ore

The Duobaoshan super-large copper-molybdenum deposit is located in the arc-shaped tectonic belt of the Heihe-Nenjiang Haixi period splicing belt and the Nenjiang-Huma strike-slip fault. There is a Sangou skarn type iron -copper deposit in the north and a Tongshan porphyry copper deposit in the south. The deposit exists in the island arc volcanic sedimentary rocks and is formed in a porphyry copper deposit in the collisional uplift orogenic environment. At present, the proven reserves of 230×10 4 t are typical ultra-large porphyry copper deposits in China. Ore mainly native sulfide ores, metallic minerals mainly chalcopyrite, bornite, pyrite, cuprite, covellite, molybdenite and the like; non-metallic minerals are feldspar, quartz, mica, white water, Calcite and epidote. The emission spectra and chemical analysis were carried out on the samples used in the experiments.

Third, optional research

(1) Grinding fineness test

The cumulative distribution rates of copper and molybdenum metals in each grade product are shown in Figures 1 and 2 (omitted) under different grinding time. The cumulative distribution ratios of copper and molybdenum metals in -0.15 mm (100 mesh) and -0.076 mm (200 mesh) products are shown in Table 2 (omitted).

It can be seen from the distribution of metal in the grinding products that when the grinding time reaches 10 min or more and the content of -0.076 mm (200 mesh) in the grinding product is above 63.48%, it is in the optimal flotation particle size range -0.15 mm (100 mesh). The cumulative distribution rate of copper and molybdenum metal in the product has reached more than 94%; even when the grinding time reaches 8min or more, the content of -0.076mm (200 mesh) in the grinding product is above 57.51%, which is in the best flotation The cumulative distribution of copper and molybdenum metals in the particle size range of -0.15mm (100 mesh) can reach about 90%, which creates conditions for the flotation recovery of copper and molybdenum minerals in the case of coarse grinding.

Table 1 Grinding fineness test results

(2) Selection of pulp pH value

Considering the nature of the ore and the configuration of the field equipment, the grinding fineness of this test is -0.076mm, which accounts for 68%, that is, the grinding time is determined to be 6min. The pH adjuster is lime, and the addition point is ball mill . The relationship between the amount of lime and the pH value of the slurry is shown in Table 2.

Table 2 Relationship between lime dosage and pH

Considering the relationship between the floatability of copper and molybdenum minerals and the pH value of the slurry, the amount of lime should be 2kg/t, that is, the flotation is carried out in a weakly alkaline medium with a pH of about 9.

(3) Determination of the flotation process

According to the nature of the ore, the main valuable minerals in the ore are copper, molybdenum and precious metals. In order to facilitate the separation of copper and molybdenum, combined with our successful experience in other mines in China (such as Jiangxi Dexing Copper Mine and Shaanxi Jinduicheng Molybdenum Company), It is advisable to use a molybdenum-copper or the like which can be floated and then separated to enhance the process of selecting copper. In the floatable stage such as molybdenum and copper, the collector with strong selectivity to molybdenum mineral is selected to increase the recovery rate of molybdenum as much as possible, and at the same time facilitate the subsequent separation of copper and molybdenum. In the stage of strengthening copper selection, the harvesting capacity can be selected according to the nature of the ore. Strong collectors (such as butyl xanthate) to enhance copper recovery.

(4) Choice of floatable stage collectors such as molybdenum-copper

Test selected collector include kerosene, diesel, TBC114, Mac14, CSU31 (CSU31 Central South University, newly developed for the nature of the ore Duobaoshan agents) and the like, as shown in the test process shown in Figure 1.

The test results show that the use of kerosene or diesel oil as a floatable collector such as molybdenum and copper makes it difficult to achieve a high level of molybdenum recovery. The use of Shan TBC114 and Mac14 as collectors improves the recovery of molybdenum, but in mixed concentrates. The low molybdenum content makes it difficult to carry out subsequent separation operations. The CSU31 collector developed for the ore properties of Duobaoshan Copper Mine takes into account the grade and recovery rate of molybdenum in mixed concentrates, and is a better collector in floatable operations such as molybdenum and copper.

(5) Open circuit test

CSU31 was used as the floatable collector such as molybdenum copper, and butyl xanthate was used as the enhanced copper collector. The open circuit test was carried out according to the procedure shown in Fig. 4. It can be seen that using CSU31 as a collector, copper-molybdenum mixed concentrate containing 39.59% copper, 1.53% molybdenum and 86.56% molybdenum recovery rate can be obtained through two selections, which lays a foundation for the subsequent copper-molybdenum separation operation. At the same time, the copper recovery rate in the enhanced copper selection stage needs to be improved.

(6) Full-process closed-circuit test results

After a large number of exploratory tests, a series of collector dosages, foaming agent dosage, copper-molybdenum mixed concentrate selection times, copper and molybdenum separation sodium sulfide dosage, copper and molybdenum separation selection times, and enhanced copper selection were also carried out. Stage condition test and other research, and finally finalize the full-process closed-circuit test process shown in Figure 2. The full-process closed-circuit test results show that:

1. It can be floated and re-separated by molybdenum-copper, etc. - strengthen the copper selection process, select CSU31 as the floatable collector such as molybdenum-copper, etc., and then grind after the lower dosage of sodium sulfide (700g/t), after 6 In the second selection, molybdenum concentrate containing 48.63% molybdenum, 0.73% copper and 71.52% molybdenum recovery rate can be obtained, and at the same time, a part of copper containing 29.93% copper, 0.081% molybdenum and 76.87% copper recovery rate is obtained. Concentrate. 2. In the copper selection operation, butyl yellow drug was used as the collector, and the second part of copper concentrate containing 15.88% copper, 0.022% molybdenum and 9.77% copper recovery was obtained. The two parts of copper concentrate are mixed, the copper grade is 27.40%, and the copper recovery rate is 86.64%.

Fourth, the conclusion

In view of the fact that this test is of laboratory scale, closed-circuit test and re-election test are carried out on the basis of more detailed conditional tests. The results show that for the sample taken, molybdenum-copper and other floatable and re-separation--enhanced copper selection process are adopted. The effective recovery of copper-molybdenum minerals can be realized, in which the copper concentrate grade is 27.40%, the copper recovery rate is 86.44%, the molybdenum concentrate grade is 48.63%, and the molybdenum recovery rate is 71.52%. There are still the following problems to be solved during production: (1) detailed grinding work index data; (2) necessary verification test before production; (3) reasonable process structure verification when molybdenum selection; (4) reasonable on-site production Distribution plan; and so on. Due to the unique ore properties and metallogenic conditions of Duobaoshan, detailed follow-up experimental studies are recommended.

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