Angang sintering plant, Qidashan beneficiation plant, steel companies Jiuquan concentrator, are used as catalyst a weak magnetic iron magnetic separation process, the resultant magnetic concentrate grade is generally about TFe61%. In order to solve the deep processing problem of roasting magnetic separation concentrate, the roasting magnetic separation concentrate cation reverse flotation project of the magnetic separation workshop of Angang Sintering Plant was officially put into operation on October 16, 1979.
After several years of industrial production practices, as well as continuous improvement and improvement of industrial processes and equipment, the annual production statistics of commodity concentrate grades are stable at TFe65~66%, basically meeting the design specifications and the requirements of “fine materials†for blast furnace smelting. , achieved significant comprehensive economic benefits.
(1) Characteristics of roasting magnetic separation concentrate
The roasting ore is an artificial magnetite made by reduction roasting of weak magnetic iron ore. Compared with natural magnetite, its remanence and coercive force are larger, and the magnetization coefficient is relatively smaller. After magnetic induction, the coercive force is usually 14 to 27 kA/m, which is 2.5 to 5 times that of natural magnetite, which causes the magnetic agglomeration of fine-grained magnetic separation concentrate to be more serious. With the inclusion of mineral or quartz particles, it has caused certain difficulties in the selection of fine screening or re-flotation.
About 50% of the original ore processed by the magnetic separation workshop of Anshan Iron and Steel Co., Ltd. is the artificial magnetite of the Donganshan and Qidashan lean hematite by reduction and roasting; the other half is the natural magnetite of the Yanshan iron ore. The magnetic separation concentrate is a product obtained by processing the above mixed ore.
(II) Design of reverse flotation engineering for roasting magnetic separation concentrate
In March 1978, Anshan Iron and Steel Sintering Plant conducted a cation reverse flotation industrial test for processing 10t magnetic separation concentrate per hour in the magnetic separation workshop. The selected mixed ore (calculated magnetite and natural magnetite each half) magnetic separation concentrate grade TFe63%. After being selected by the reverse flotation process, the final concentrate containing 67-68% of iron and less than 5% of SiO 2 can be obtained, and the recovery rate of reverse flotation operation is 97-98%. Accordingly the reverse flotation selection of projects designed by the Anshan Mine Design and Research Institute of black metallurgy.
The principle flow adopted in the design is: graded grinding-reverse flotation-weakening-medium magnetic separation. Anti-flotation concentrate, magnetic separation of tailings, return of medium mine, self-recycling, re-election.
The selection criteria determined by the design are:
Selected roasting magnetic separation concentrate grade TFe62%
Final concentrate grade TFe66～67%
Reverse flotation tailings grade TFe14～20%
Reverse flotation recovery rate 97~98.5%
Reverse flotation concentrate yield 92%
The pharmaceutical system for reverse flotation is determined as:
The collector is dodecylamine, which is an aliphatic amine with a carbon chain length of C 11 C 13 produced by Dalian Oil Chemical Factory. The amount of concentrate selected per ton is 80-100g.
Pre-formulation of the drug, mixing the synthetic dodecylamine with hydrochloric acid by 5:1 (by weight ratio of pure hydrochloric acid), adding a small amount of water, stirring for a certain period of time, then adding water to prepare a concentration of 1% (by amine) The aqueous solution is placed for several hours and used after it has been completely dissolved.
The total estimated investment for the design of all projects is 5.17 million yuan. [next]
(III) Production practice of reverse flotation of roasting magnetic separation concentrate
The cation reverse flotation process of the mixed magnetic separation concentrate of roasting ore and natural magnetite in Angang Sintering Plant has been operating normally since October 16, 1979. It is operating normally, operating smoothly, and the indicators are stable. Technical and economic indicators have reached or approached the design requirements. In the past 9 years, it has produced nearly 9 million tons of high-grade iron concentrate, providing "fine material" for the production of ironmaking in Anshan Iron and Steel.
A Process Profile The current roasting magnetic separation concentrate reverse flotation process is based on the particle size composition and metal distribution characteristics of magnetic separation concentrates, which are selected by comparison of seven process structure schemes and semi-industrial tests. The principle process is shown in Figure 1, and Figure 2 is the device contact diagram.
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B Operation status a Factors affecting the reverse flotation operation Flotation granularity: The particle size of the ore selected by the reverse cation flotation must reach 80-85% of 200 mesh, because the floatability of the +200 mesh coarse-grained quartz is poor. The amount of foam and the grade of foam also increase, which increases the cyclic load of the process.
Flotation concentration: Through production test, when the concentration percentage of the slurry is less than 35%, the coarse-grained quartz is not easy to float; when the concentration is as high as 50%, the bubble dispersion is poor. Generally, it is preferably 35 to 45%.
Pharmacy system: The amount of amine collector added varies with the quality of the agent, the nature of the ore, and the particle size and concentration of the slurry. Under normal circumstances, the average unit consumption of dodecylamine is about 160g / t, using a centralized dosing. Compared with the one-time dosing and the sub-dosing, the screening effect did not change much.
Flotation time: 60 sets of 6A flotation machines with a volume of 2.8 m 3 were selected. 10 units per system, total effective volume 28m 3 , calculation of flotation time 22min. Since dodecylamine is a preferred surface active material, it has the dual function of a collector and a foaming agent in the reverse flotation process. After the addition of the slurry, the mineral of interest is rapidly mineralized and floated. The results of the trough-by-groove analysis indicated that about 50% of the gangue and its associated organisms floated from the 1st to 4th tanks, and the magnetic separation concentrate grades in the 5-8 tanks were enriched to 65.50%. The groove-by-slot analysis data for reverse flotation is shown in Figure 3.
b Weak magnetic-medium magnetic sweeping operation The anti-flotation foam products have an iron content of nearly 39% and a metal content of 33%. Among them, there are lean, rich and continuous weak magnetic iron minerals with poor degree of reduction. Therefore, the sweeping operation of the foam consists of a weak magnetic-medium magnetic-dewatering tank. Among them, the weak magnetic separator is used to eliminate residual foam and select most of the ferromagnetic minerals. The tailings of the weak magnetic separator are fed into the middle magnetic ring, and the strength of the medium magnetic field is maintained at 160 kA/m. That is to say, a small amount of tailings with a grade of about 11% is discarded, and a large amount of medium ore can be recovered, and regrind and re-selected.
c The main problems reflected in the mine processing operations are:
(1) After the return of the mine, the selected grade of the reverse flotation is reduced to about 55% of TFe. It is necessary to increase the concentrate grade by more than 10% after a period of reverse flotation, and to ensure that the iron content of the final concentrate reaches 66%, it must be scraped. a large amount of foam in the mine, the yield range is 30 to 70%, generally 50%;
(2) It has been determined that there are 11.6% of the poor and rich Liansheng body in the mine. This requires re-grinding, but a large part of it is monomeric iron minerals and quartz, and it has not been re-selected. Feeding into the regrind machine, which increases the load on the regrinder and causes overgrinding and muddy. Therefore, it is very beneficial to improve the operation of the cyclone and to strictly classify the medium ore to re-grind and re-select the coarse particles.
C Production Indicators After the anti-flotation selection process is put into production, with the gradual improvement of the process and the improvement of management and operation level, all major production technical indicators have reached or approached the design level. The production practice in the past 9 years shows that the selective flotation process of roasting magnetic separation concentrate is successful. The final concentrate grade can be stable between 65.8 and 66.2%, and the quality pass rate of the product is up to 99.47%. The grade rate is up to 90.47%, the selected process operation rate is 97%, and the operating rate is 91%. Compared with before the reverse flotation process, the concentrate grade increased by about 3.5%, the iron recovery rate decreased by nearly 1.4%, the single mill output of the ball mill decreased by about 0.5t/h, and the concentrate water increased by about 0.3. %.
Between September 1987 and November-December 1987, the semi-industrial test of 10 t/h scale was carried out twice in alignment with Dashan roasting magnetic separation concentrate. The test process is to take the fine sediment from the original dewatering-weakening-fine-screening process as the ore. After the classification, re-grinding and dewatering tank treatment, the anti-flotation agent is added with dodecylamine (150g/t). And hydrochloric acid (amount of 90g / t), selected particle size -200 mesh accounted for 87 ± 1%, pulp concentration of 40 ± 2%, flotation at room temperature.
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