I. Introduction
It belongs to a large complex skarn sulfur iron sulphide copper ore, copper sulfur flotation process undergone full hybrid flotation, selective flotation process step to float the like may be (or mixture selected portion) of the transformation process. The original design of the mixed flotation process can not fully adapt to the ore properties, the consumption of chemicals is high, the flotation index is low, and the step-by-step priority flotation process is put into production for about two years. The practice shows that the process has greatly improved the indicators of copper and silver . However, in the production, the crude alkalinity of copper is difficult to control, and the sulfur recovery rate is unstable; the advantages of the step-by-step preferential flotation process are absorbed to carry out the modification of the floatable (or partially mixed) process, thereby ensuring copper recovery. On the basis of stable rate, the sulfur recovery rate has been greatly improved. During the period, the full-priority flotation process has also been applied in the industry for a short period of time.
In order to further improve the index, after a pilot study, a process scheme using copper collector EP open-circuit preferential flotation was proposed. Efficient selective copper collector EP can expand the floatation between copper and sulfur minerals. After a period of grinding, the copper mineral monomer dissociation can reach 80%-85%, with selective copper collector EP. Selectively capture the copper minerals that have been dissociated from the monomer, and adopt the open-circuit preferential flotation process structure, which not only improves the copper recovery rate, but also avoids the inhibition of sulfur in the middle-mineral cycle, thereby increasing sulfur. Recovery rate. Many test results in the laboratory obtained good test results. On the basis of the completion of the adaptive verification test on site, the industrial test achieved the expected results, the copper concentrate grade increased by 1.11 percentage points, the copper recovery rate increased by 1.58 percentage points, and the sulfur recovery rate increased. 10.86 percentage points.
Second, the research program discusses
In comparison, the hybrid flotation process (Fig. 1) is easy to operate and has a high process adaptability. Therefore, it has the longest use time in production, but the process does not consider the difference in floatability of copper and sulfur minerals. When floating up, they are competitive with each other. A large amount of sulfur rises to make the copper flotation lag, which will lead to high copper content in the tailings. The coarse concentrate of the mixed flotation is large, and more collectors will be brought into the separation flotation. The difficulty of separating copper and sulfur is increased, and the flotation index of the process is low.
Part of the mixed flotation process (Fig. 2) takes into account the difference in floatability of copper and sulfur minerals. The use of the hunger-administered pharmaceutical system reduces the yield of the separation flotation, the process stability is good, and the use effect is better. The application time in production is long, but there is still a problem that the separation of copper and sulfur is difficult and the index is not ideal.
For high-sulfur ore, the high-precision flotation process (Figure 3) has high test indicators and should be the preferred option in theory. In fact, the long-term research and practice adopts a step-by-step priority process (Figure 4), semi-priority. The process (essentially the same as in Figure 4, the pharmaceutical system is different), the partial priority process (similar to Figure 4), the floatable process (similar to Figure 4), and the full priority flotation process (Figure 3), the commonalities of these processes are The process structure of copper preferential flotation is only different in the selected pharmaceutical system. The priority of copper is different. This undoubtedly indicates that the preferential flotation of copper is conducive to improving the index. The industrialization process is due to the limitation of the pharmacy and the unreasonable structure of the process. The problems of unstable copper index and low sulfur index were exposed.
Through the analysis of disproportionation degree of ore grinding, after a period of grinding, the dissociation degree of copper mineral monomer can reach about 85%, which provides conditions for the application of selective flotation technology, and the monomer is dissociated by EP. The coarse-grained copper mineral was selected for flotation, and the copper open-circuit preferential flotation process was proposed through experiments.
Third, copper open circuit priority flotation test
The copper open-circuit preferential flotation process (Fig. 5) consists of two parts: copper selective flotation, medium-mineral sorting and copper tailings. The innovation of this process is to study the high-selectivity high-efficiency copper that is suitable for the nature of the mine. The collector EP, due to the special action of the drug, does not require other collectors to assist in preferential copper selection, and has sufficient foaming properties. The medium ore mine can sort out qualified sulfur concentrates, adopting the open-circuit priority process structure, avoiding the strong suppression of sulfur in the middle-mineral circulation, thereby increasing the sulfur recovery rate.
Considering the factors of easy industrialization, the tests of two sorting schemes of copper coarse concentrate sorting (Fig. 5) and combined sorting (Fig. 6) were carried out. The performance of the ore sample is in accordance with the ore properties of the 2-3 years of mining. The copper grade is 0.61%, the sulfur grade is 10.20%, the copper oxidation rate is 6.28%, the copper phase analysis results are shown in Table 1, and the closed circuit test results are shown in the table. 2, Table 2 indicators are significantly better than the closed-circuit test results of the field process Table 3 indicators.
Fourth, the new process site adaptability test
For the copper open-circuit preferential flotation process plan, two adaptive tests were carried out on site with EP high-efficiency collector, and the test achieved the expected results.
For the first time, the original ore sample was taken from the ball mill to the ore belt. The copper grade was 0.49%, the sulfur grade was 9.89%, the phase analysis was shown in Table 4, and the copper oxidation rate was 4.49%. The test results are shown in Table 5.
For the second time, the original ore sample was taken from the ball mill belt to obtain the copper grade 0.618% and sulfur grade 9.10%. The copper phase results are shown in Table 6. The copper oxidation rate was 9.71%. The test results are shown in Table 7.
As can be seen from Tables 6 and 7, the new process has great advantages.
V. Industrial test
The plant selection scale is 10000t/d, the 2# system is selected as the test system (scale 5000t/d), and the 1# system is used as the comparison system (scale 5000t/d). The EP agent is used for the open-circuit priority flotation industrial test.
This industrial test has carried out a total of 74 shifts in 26 days. The test system (2# system) has processed 126,282 tons of mines, and the comparative system (1# system) has processed 124,686 tons of ore. The calculations based on the test results of the production samples are based on calculations. For the selected indicators, the cumulative (weighted) indicators of 74 shifts for 26 consecutive days are shown in Table 8.
Conclusion
(1) After 20 years of unremitting efforts by a mine, the economic and technical indicators of mineral processing have reached a fairly high level. After the technical proposal of the small test, several adaptive verification tests were carried out, and the industrial test was successful, which proved that the new process has strong adaptability to the mine.
(2) EP agents can increase the floatation of copper-sulfur minerals, have strong selectivity to copper, are more suitable for the mine, are easy to operate, and are favorable for flotation stability, and are excellent collectors for the new process.
(3) The new process index has been significantly improved. The cumulative weighted index of 74 shifts for 26 consecutive days is: copper concentrate contains 21.42% copper, copper recovery rate is 82.88%, sulfur concentrate contains 36.47% sulfur, and sulfur recovery rate is 75.72%. Compared with the comparison process (original process), the copper grade of copper concentrate is 1.11 percentage points higher, the copper recovery rate is 1.58 percentage points higher, and the sulfur recovery rate is 10.86 percentage points higher.
references:
[1] Zhu Yushuang, Zhu Jianguang, chemistry of flotation reagents [M], Central South University of Technology Press, 1987.
[2] CY Sun, CD Li, etc. Application of a new Separation Method of Fine Complex Copper Sulphide Ores to Industrial Process, XXIV INTERNATIONAL MINERAL PROCESSING CONGRESS VOLUME1 2008(1): P1201-1204.
GR (SHANDONG) NEW MATERIAL CO., LTD , https://www.grmaterial-film.com