Report Name: Experimental report on the ore dressing of Rooster Mountain iron - zinc ore in a certain area of ​​Henan Province
Completion time: 2007 10
Publisher: Guo Changqing Guiding Expert: Gong Meiling Huang Kaiguo Gu Zhongxiang Project Leader: Duan Zhu Report Pages: Foreword 52 pages
Foreword:
Entrusted by Henan Lushi County Mining Co., Ltd., Xi'an Tianzhou Mining Development Co., Ltd. conducted a mineral processing test on the Mupengou iron-zinc mine in Yaozhang Village, Du'ao Town, Lu'an from August 6 to October 2007. The purpose is to provide technical information for the development and utilization of the ore and the expansion and expansion of the ore dressing plant.
Governed by a mine monzogranite porphyry hydrothermal contacting account Magnetitite - Pb Zn - molybdenum - copper deposit. The ore is more complex in nature and contains more minerals. The skarnized porphyrite is formed by contact exchange and hydrothermal mineralization of carbonate rocks. The main metal mineral magnetite, pyrite, iron sphalerite, chalcopyrite, pyrrhotite, limonite red, milky containing chalcopyrite sphalerite like. Gangue minerals are: potassium feldspar, quartz, smectite, epidote, calcite, serpentine, diopside, hornblende, sphene like. The ore contains Zn 1.20%, Fe 15.32%, S 4.10%, Cu 0.11%, SiO 2 32.50%, MgO 17.11%, and CaO 7.80%.
The test uses the flotation-magnetic separation principle process. Flotation adopts three kinds of process schemes: 1. First sulfur post-zinc preferential flotation process; 2. First zinc post-sulfur preferential flotation process; 3. Zinc-sulfur mixed flotation-zinc-sulfur separation process. In order to improve the grade of zinc concentrate and iron concentrate, the zinc concentrate demagnetization and iron concentrate desulfurization test were also carried out. The results of the ore dressing test are shown in Table 1.
Zinc-iron ore dressing test results Table 1 Process plan | product name | Yield(%) | grade(%) | Recovery rate(%) |
Zn | Fe | S | Zn | Fe | S |
First sulfur post-zinc preferential flotation process | Zinc concentrate Sulfur concentrate Iron concentrate | 1.19 4.60 13.25 | 34.02 1.98 0.089 | 11.20 23.46 61.00 | 25.16 35.39 0.64 | 52.74 7.60 0.97 | 1.56 7.51 52.885 | 16.19 42.37 6.09 |
First zinc post-sulfur preferential flotation process | Zinc concentrate Sulfur concentrate Iron concentrate | 2.88 2.98 13.25 | 32.15 0.80 0.089 | 11.05 27.64 61.00 | 25.07 23.41 0.64 | 73.20 1.88 0.97 | 2.20 5.40 52.85 | 17.61 17.17 6.09 |
Mixed flotation-zinc-sulfur separation process | Zinc concentrate Sulfur concentrate Iron concentrate | 2.33 8.33 13.25 | 40.54 1.32 0.089 | 11.40 33.70 61.00 | 27.66 30.89 0.64 | 76.93 8.89 0.97 | 1.67 18.25 52.85 | 16.77 65.68 6.09 |
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Conclusion:
(1) Henan Lushi Rooster Mountain Zinc-iron ore is subject to the contact of hydrothermal liquid magnet-lead-zinc-molybdenum-copper deposits. There are many kinds of metal minerals in the ore, the ore is complex in nature, and the inlay is closely related. The main metal minerals are magnetite, pyrite, iron sphalerite, chalcopyrite, pyrrhotite, red limonite, sphalerite containing opal chalcopyrite, galena, molybdenite Wait. The main gangue minerals as potassium feldspar, quartz, olivine, tremolite, ophiolite, calcite, hornblende, apatite, dolomite, smectite, curtain edge, sphene like.
(2) The zinc mineral in the ore is iron sphalerite, and the color is dark brown to black. The ratio of FeS to ZnS is between 1:5 and 1:2. Since the mineral itself contains iron (>10%), it not only reduces the floatability of the zinc mineral, but also affects the zinc concentrate grade. This is one of the reasons why the zinc concentrate grade is not high.
(3) The pyrrhotite in the ore accounts for about 5% of total iron, and the ratio of Fe to S varies greatly. Fe 5 S 6 ~Fe 16 S 17 , the floatability of pyrrhotite also follows the atom. The ratio S/Fe increases and strengthens, that is, the higher the S, the better the floatability of the pyrrhotite, not only easy to enter the zinc concentrate during the flotation process, but also due to magnetic agglomeration and magnetic adsorption. The fine-grained magnetite is adsorbed on the surface of the pyrrhotite, so that the iron content of the zinc concentrate is generally about 20%. The results of iron phase analysis of zinc concentrate indicate that pyrrhotite accounts for 9% of total iron in zinc concentrate containing about 30% zinc, and magnetite accounts for 54% of total iron. This property of ore is another major cause of the low grade of zinc concentrate.
(4) The pyrrhotite in the ore has another characteristic. The higher the Fe, the worse the floatability of the pyrrhotite, and the stronger the magnetism, the easier it is to be selected into the iron concentrate during the magnetic separation process. It has a great impact on the quality of iron concentrates, which is also the main difficulty in reducing the sulfur content of iron concentrates. Even under the conditions of grinding fineness - 320 mesh and above 95%, it is difficult to reduce the sulfur content in iron concentrate by multi-plan flotation desulfurization. The iron phase analysis of iron concentrate shows that the sulfur in the iron concentrate is mainly pyrrhotite. After the high temperature roasting of the iron concentrate, the sulfur content is still about 0.6-0.8%. This part of sulfur is likely to form a homologous or solid solution with magnetite.
(V), the test uses three flotation process, (1), the first priority post-sulfur zinc flotation process; (2), the first zinc after sulfur preferential flotation process; (3), zinc-sulfur mixed flotation-zinc Sulfur separation process. The three processes were all closed-circuit tests, and the pyrite was mainly recovered from zinc and iron to achieve the purpose of making full use of mineral resources.
(6) Due to the complex nature of the ore, the separation of zinc, zinc, zinc, iron, and zinc is difficult. The three processes have a simple structure of mixed flotation-zinc-sulfur separation process, less consumption of chemicals, and better selection criteria, which is beneficial to industrial production.
(VII) The results of analysis of the original ore iron phase indicate that the iron in the ore is mainly magnetic iron, but the non-recyclable iron accounts for more than 40% of the total iron content, that is, only about half of the iron is recyclable, therefore, iron The recovery rate cannot exceed 60%.
(8) Zinc-sulfur mixed flotation adopts 31 #é»‘è¯ as the collector to facilitate the recovery of sphalerite; the use of activated carbon for the extraction of mixed concentrate is also an important link; zinc-sulfur separation operation adds 10g/t of sodium cyanide It is also effective to work with lime to enhance the inhibition of pyrite. Although sodium cyanide is toxic, it is used in a very small amount and does not cause much harm to the environment. Copper sulfate (CuSO 4 ) has a significant effect on the separation of zinc and sulfur, and the dosage should be strictly controlled.
(9) The magnetic separation and de-ironing test of zinc concentrate is effective for improving the grade of zinc concentrate and reducing the iron content in zinc concentrate. The grade of zinc concentrate can be increased from about 35% of magnetic separation to 40% after magnetic separation. The iron content in the zinc concentrate is also reduced from 16% before magnetic separation to about 11% after magnetic separation, and the total recovery of zinc is over 76%.
(10) The process plan adopted in this test and the obtained technical indicators have improved the reliable technical data for the development and utilization of the mine and the on-site reconstruction and expansion. Compared with the same type of ore at home and abroad, the selection index is better, except for zinc and iron. In addition to effective recovery, pyrite is also recovered comprehensively. From the perspective of reducing the cost of mineral processing, it is recommended to use a mixed flotation-zinc-sulfur separation process.Freshwater Trolling Motor
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