Application of New Chelating Agent B-130 to Improve Flotation Index of Refractory Copper Oxide Ore

Green Copper Mine is a large skarn iron deposit copper, copper and iron rich gold silver and other valuable elements, mining scale 4000t / d, mined ore refractory considerable proportion of copper oxide ores. The nature of this part of the ore is complex, the content of difficult copper minerals is high, the oxidation rate, the combination rate, the mud content is high, and the ore recovery is difficult. The original design uses the "self-grinding + conventional vulcanization flotation" process to treat refractory copper ore. The copper concentrate grade is generally 10% to 15%, and the copper recovery rate is generally 30% to 40%. High production costs seriously affect mine efficiency. As a result, a large amount of ore is unmanageable and can only be stored in the yard.

In response to this mineral processing technology problem, the mine cooperated with relevant scientific research units and adopted the new chelating agent B-130 as a suitable collector for refractory copper oxide ore. It carried out small-scale tests, semi-industrial tests and industrial tests, and achieved satisfactory results. The results were promoted and applied in on-site production, and the ore recovery index was significantly improved.

First, B-130 drug

B-130 was developed by the Institute of Sichuan Nonferrous Metallurgy a novel chelating collector, a petrochemical products, solid and liquid forms, strongly alkaline. The raw material of the medicament has wide source and low price; the ignition point and the boiling point are high, the transportation and storage are safe; the water is easy to dissolve, the preparation is convenient to add; the non-irritating odor is popular among the operators.

B-130 is a new type of beneficiation ore dressing agent for copper oxide ore. The mechanism of action is to enable the mineral surface vulcanization film to adsorb the collector rapidly and firmly during the flotation process, thereby increasing the refractory copper mineral. The floating speed and flotation efficiency; the second is to eliminate the interference of the slime on the flotation process, and have strong selective collection performance for minerals such as malachite and pseudo malachite.

Second, the nature of the ore

Table 1, Table 2 and Table 3 respectively show the multi-element analysis, main mineral content analysis and copper phase analysis results of the refractory copper oxide ore in Tonglu Mountain.

Table 1 Multi-element analysis of raw ore analysis /%

Table 2 Analysis results of main mineral content in ore (mining field) /%

Table 3 Analysis results of raw ore copper phase /%

The main useful minerals in the ore are malachite, pseudo malachite, cuprite, copper blue, chalcopyrite, chalcopyrite, natural copper, porphyrite, azurite, magnetite, associated gold and silver minerals; The gangue minerals are quartz , chalcedony, kaolinite, montmorillonite, calcite , chlorite, feldspar, etc.

Malachite is the most important copper mineral in the ore. It is radial, and the cement is embedded in the hematite cracks and holes. A small amount is embedded in the gangue to form a film. Occasionally, it is symbiotic with copper and blue, and has a wide particle size distribution. However, it is mainly 0.03 to 0.15 mm. Pseudo-malachite occupies a considerable proportion of copper minerals in oxidized ore, widely distributed, and has various forms of compaction, such as dense block, hull, and flake. The grain size of the inlay is generally 0.04 mm and the minimum is 0.003 mm. The ore in the ore generally has a ring shape, a fiber shape, a radial shape, a gel shape or a star point shape, and the particle size is generally 0.02 to 0.15 mm, which is complicated in relationship with the goethite embedding, and it is difficult to dissociate the monomer. There are three types of embedding of associated gold in the ore: fissure gold is distributed in the mineral fissure, intergranular gold is distributed between other mineral particles, and the gold is embedded in the middle of the mineral crystal, and the particle size distribution is fine.

Due to the geological fault activity, the ore body is broken, the surface is exposed, and it is subjected to deep dripping oxidation. The ore mud is very serious. The ore-concentrated ore sample has a grain-level ore occupation rate of 75% or less and -0.833 mm. Up to 34.22%.

Third, small trials

(1) Open circuit test

Test ore sample: The refractory copper oxide ore is taken from the No. 1 ore body of the open pit, and the test ore sample is prepared by crushing-mixing.

Test procedure: Based on the on-site production situation, a section of grinding, three rough selections, and a selected open process were selected through experiments. The grinding fineness -0.074 mm accounted for 67%.

Pharmacy conditions: Four groups of pharmaceutical regimens were determined by orthogonal test and are given in Table 4.

Table 4 Small Test Pharmacy Program / (g·t ^-1 )

Table 5 Small comparison test results /%

The test results (Table 5) show that compared with the conventional vulcanization method, the B-130 method has a copper recovery rate of more than 10% when the copper concentrate grade is basically the same, while Na ₂ S, butyl xanthate, and pine oil The dosage has decreased to varying degrees.

(2) Closed circuit test

In order to further verify the results of the open circuit test, a closed-circuit test was carried out by taking the test ore sample from the mine. The oxidation rate, binding rate and mud content of the ore sample are higher than that of the stope ore, and it is an refractory copper oxide ore that has been accumulated over the years. The results of closed-circuit tests show that the copper ore concentrate is improved by 3.65% and the copper recovery rate is increased by more than 10% compared with the conventional vulcanization method in the treatment of arsenic copper oxide ore. The Na ₂ S and butyl yellow drugs are also improved. Pine oil has also declined to varying degrees.

Fourth, industrial practice

(1) Semi-industrial test

The refractory copper oxide ore was selected from the yard for 200t, crushed and mixed to make a semi-industrial test sample. The test process is a closed-circuit grinding, a rough selection, two sweeps, and a selection. The test was conducted in four production shifts in three shifts in three stages: (1) conventional vulcanization flotation test; (2) liquid B-130 test; and (3) solid B-130 test.

The test results show that the Huai body B-130 and the solid B-130 flotation copper-green mountain refractory copper oxide ore index is equivalent, the B-130 method is higher than the conventional vulcanization method flotation copper green mountain refractory copper oxide ore copper recovery rate 8 %~10%, at the same time, the recovery rate of associated gold and silver also increased.

(2) Industrial test

The industrial test was carried out in the self-grinding system of the Tonglushan Mine. The ore was treated as a difficult-to-select copper oxide ore. The test lasted for 10 days and a total of 30 production classes were carried out to treat 12,000 tons of ore. During the test, the B-130 method and the conventional vulcanization method were used for the diving.

Self-grinding system flow (given by Figure 1): 1 wet self-grinding machine , 1 lattice ball mill and 1 double spiral classifier to form a semi-closed circuit self-grinding process; rough selection of 5 JJF-16 flotation machines, sweep Select 4 JJF-16 flotation machines and select 6 JJF-4 flotation machines to form a flotation process.

The industrial test results are shown in Table 6. The results show that B-130 can improve the copper recovery rate of the refractory copper oxide ore in the Tonglushan Mine, which is 5.25%, the gold recovery rate is 6%, and the copper concentrate grade is 0.8%.

(3) Production application

After the successful industrial test of the self-grinding system of Tonglushan Mine, B-130 was successively applied in the series of 2, 3, and 4 oxidized ore flotation of self-grinding system. Table 7 shows the comparison of typical production statistics indicators before and after the addition of B-130 in the self-grinding system. The statistical indicators show that adding B-130 agent 300-400g/t in the refractory copper oxide ore flotation improves the copper recovery rate. 10.53%, gold recovery rate of 8% to 10%, while Na ₂ S, butyl xanthate, and pine oil have decreased to varying degrees. In the case of general copper oxide ore, the addition of an appropriate amount of B-130 also significantly improved the ore recovery index.

Table 6 Industrial test results /%

Table 7 Comparison of production statistics before and after adding B-130 to the self-grinding system/%

(5) Conclusion

The new chelating agent B-130 has strong selective storage performance for refractory copper oxide minerals, can accelerate the floating speed of refractory copper minerals, and can effectively eliminate the interference of slime on flotation. It is difficult to select copper oxide minerals. Efficient collector.

After the application of B-130 in Tonglushan Mine, the ore recovery and recovery index of refractory copper oxide ore is greatly improved. The agent has a promotion value in other similar refractory copper oxide mines.

Tang Yanbin

(Daye Nonferrous Metals Corporation, Huangshi, Hubei 435005)

references

[1] Hu Xigeng. Flotation Theory and Practice [M]. Changsha: Central South University of Technology Press, 1991.

[2]Tang Yanbin. Discussion on Beneficiation Process of Tonglushan Copper Oxide Ore[J]. China Mine Engineering, 2004, (4): 13-16.