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This patent is a method of flotation of molybdenite in a rough selection operation without the use of a collector . Coarse concentrates that are not contaminated by collectors have a high recovery rate, and are selected to obtain high-grade concentrates, while the coarsely selected tailings are re-flotated, and the remaining molybdenum ore and other valuable gold Genus can be well recycled.
I. Introduction to the invention
The invention expects a small amount of foaming agent to be used instead of a collector (such as oil) to float the molybdenum ore under the condition of coarse grinding particle size, so that the concentrate produced does not contain the collector, and then After grinding, continue to select. The tailings without flotation flotation are mixed and floated to obtain a sulfide mixed concentrate, which is further processed to recover the remaining molybdenum ore and other valuable sulfide minerals. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are schematic diagrams of the process flow recommended by the invention.
Second, the introduction to the drawing
The drawing is a schematic diagram of the process flow recommended by the invention.
Schematic diagram of non-collector flotation molybdenum ore
Third, the invention narrative
The invention will be described below with reference to the accompanying drawings. The ore (11) contains 0.05 to 0.5 MoS 2 and 0.5 to 4.0 FeS 2 , and the sulfides of zinc , copper and lead are at least 0.2% each, and the silver content is 0.5 oz/ton. Wet grinding (12) concentration is 60% to 70%. In the sorting process without collector flotation (13), only a small amount of foaming agent is added, and the grinding fineness is about 60% to 80%-100 mesh. Typically 60% to 70%, 0.1 lb/ton of pine oil or other blistering such as methyl isobutyl carbamide, channel 250 or aerofrother is added. The flotation of no catching jing should be regarded as a roughing operation, which produces coarse concentrate (14). The coarse concentrate recovers most of the molybdenite in the ore and then enters the regrind operation (15), and the fineness is 98% to 99% - 100 mesh. Selected (16) to obtain high-grade molybdenum concentrate (17) containing 98% MoS 2 , Cu < 0.05%, and SiO 2 < 2%, which meets the quality requirements of Class B products. Grade B molybdenum concentrates can be used to make dry lubricants.
The tailings (18) with no collector coarse selection and the selected tailings (19) are combined, and flotation oil or xanthate is added to carry out mixed flotation of sulfide minerals (20) to obtain coarse concentrate (21). Contains the remaining molybdenite and other metal sulfides and silver. The coarse concentrate is reground (22), and the eagle fineness is 85% to 90%-100 mesh, and then it is selected into the selected circuit (23), and the concentrate (24) is sent to the Cu-Mo separation ( 25), obtaining a sulfide concentrate (26) and a molybdenum concentrate (27). The molybdenum concentrate is then re-selected into the beneficiation circuit (28) for sorting to obtain the final molybdenum concentrate (29). The selected tailings (30) are returned to the Cu-M0 separation operation. The final aluminum concentrate should have a MoS 2 grade of over 90% and a copper and silicon content of no more than 0.1% and 7%, respectively.
Fourth, examples
16 tests were performed, each weighing 2 kg. The ore grade of the sample: 0.3% MoS 2 , 2.2% FeS 2 , 0.007% Cu, 0.003% Pb, 0.012% Zn, 0.03 Ag oz/ton. Grinding with a rod mill, grinding concentration of 65%, grinding fineness of 65%-100 mesh, using a Denver-1 flotation machine (1000 g), flotation concentration of 35%, adjusting the pH with lime to 8. Add 0.04 lbs/ton of pine oil for flotation without collectors and select for 2 minutes. The average test results for the 16 tests are listed in Table 1.
Table 1 No collector flotation test results
Mixed flotation was carried out on steam oil for crude tailings or sulfide ore. The results of several tests are shown in Table 2.
Table 2 Results of mixed tailings test of coarse tailings
Note: The ore grade is 0.070% MoS 2 , flotation time is 4 minutes, pH=8 (lime adjustment)
The test results in Tables 1 and 2 indicate that the recovery rate of molybdenite can reach 88% to 93%.
Example 2
The crude concentrate (14) without collectors contains 18.4% MoS 2 , which is opened in the pilot plant for three-stage re-grinding and five selective treatments.
The test results are shown in Table 3. The test results show that the product quality meets the requirements of Class B aluminum concentrate.
Table 3 No collectors, fine concentrates, selected test grades
Note: Ordinary molybdenum concentrate contains 20% FeS 2 , 0.15% Cu, 6.5% Si.
The mixed sulfide coarse concentrate was re-milled in two stages and three times (work 22-29) to obtain another aluminum concentrate. The test results are shown in Table 4. The test shows that the product quality meets the requirements of ordinary molybdenum concentrate.
In the non-collector flotation process, data on the grade, recovery and sorting time of molybdenum concentrates were taken from other tests (0.06 lb/ton for pine oil, 0.01 lb/ton for Xintex and 0.3 lbs for sodium silicate). Tons are added to the grinding machine). The test results show that when the grinding fineness -100 mesh accounts for 65% and the sorting time is 2 minutes, the recovery rate of coarse concentrate (14.2% MoS 2 ) can reach 81.6%; when the sorting time is 6 minutes and 10 minutes The recovery rates were 86.1% and 87%, respectively, while the coarse concentrate grades were correspondingly reduced to 9.9% and 7.5%.
In the non-collector flotation test, the other sulfurized mineral sorting time and recovery data are as follows. When the selection time was 2 minutes, the recoveries of FeS 2 , Cu, Pb, Zn and Ag in the coarse concentrate were 01.4%, 33.7%, 5.2%, 27.5% and 3.7%, respectively. The recovery rate of sulphide ore increases with the increase of flotation time.
In the previous selective flotation process, molybdenite was selectively floated from the ore, while other sulfide minerals were inhibited by the agent together with the non-sulfide ore. The agents used for rough selection are steam oil, octacux, pine oil and sodium silicate, and occasionally sodium cyanide and Knox. The mixed coarse concentrate is selected for the production of ordinary grade aluminum concentrate. The selected agents are Road 250, Steam Oil, Sodium Cyanide and Knox.
The rough selection test with steam oil shows that the grade and recovery rate of the molybdenum concentrate is 65%-100 mesh with the fineness of the selection, and the selection time is 2 minutes. The recovery rate of the molybdenite is 89%, the grade of coarse concentrate is 13.6%. When the selection time is 6 and 10 minutes, the recovery rates of molybdenum ore are 93.0% and 94.4%, respectively. The test slurry concentration was 35%, and the dosage of the agent was 0.66 lb / ton of steam oil, 0.06 lb / ton of pine oil, 0.01 lb / ton of Xintex, 0.3 lb / ton of sodium silicate, and pH 8 (adjusted with lime) ).
As mentioned above, when the sorting time is 2, 6 and 10 minutes, the recovery rates of the coarse-grained molybdenite without collector are 81.6%, 86.1% and 87%, respectively, when the concentrate (steam oil) is added. After 2 minutes of flotation, the recovery rate of molybdenum ore was 7.4% higher than that of non-collector flotation, and the recovery rate was basically the same at 6 and 10 minutes of flotation time (6.9% and 7.4%).
In the steam oil test, the recovery rate of other sulfide minerals and the change time of the selection time are: when the flotation is 2 minutes, the recovery rates of FeS 2 , Cu, Pb, Za and Ag in the coarse concentrate are 4.7%, 24.2, respectively. %, 14.9%, 0.8%, and 6%. The recovery of these sulfide minerals also increases with increasing flotation time.
The test results show that the selectivity of molybdenite is much higher than that of the selective flotation process. Molybdenum concentrate must be removed from other sulfide minerals that are entrained before it becomes a commodity. Even if flotation oil is added to the selection to enhance the selection effect of the non-collector flotation concentrate, in the final concentrate, the flotation oil content is higher than the selective flotation process or mixing (sulfurized minerals) The flotation process is much lower, such as only 1% to 3%.
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