First, the nature of the ore
A Copper zinc - iron ore metals copper, zinc and iron grade of 0.11%, 0.82% and 49.50%, respectively. The main metal minerals in the ore are magnetite, chalcopyrite, iron sphalerite, pyrrhotite, pyrite, iron ore, etc. The main gangue minerals are tremolite , actinolite and diopside. Calcite , dolomite, calcium iron garnet, olivine, serpentine, talc , phlogopite , chlorite.
The chemical analysis results of the main elements of the ore are shown in Table 1. It can be seen from Table 1 that the main valuable elements in the ore are iron, copper and zinc; the iron grade is 49.50%, and the grades of zinc and copper are lower, 0.82% and 0.11% respectively, which can be considered for comprehensive recovery; other metal elements The content is relatively low. Rock-forming components SiO 2, CaO, MgO and the content of Al 2 O 3 were lower, gangue minerals should contain no aluminum or less aluminum silicate minerals and carbonate minerals mainly.
The chemical phase analysis results of iron, copper and zinc are shown in Tables 2 to 4, respectively.
The results show that the oxidation rate of copper and zinc minerals in the ore is relatively low, and iron is mainly produced in the form of magnetite. Because a small amount of iron is present in the pyrrhotite, the pyrrhotite may enter the magnetic separation during magnetic separation. In the concentrate, this will affect the quality of the iron ore.
The mineral composition in the ore is complex, and copper, zinc and iron are mainly present in the form of separate minerals. Owner chalcopyrite copper, lead as the main mineral galena, sphalerite minerals are zinc, iron mainly magnetite, followed by pyrrhotite, pyrite, marcasite etc. sulfides, There are also some irons found in silicate minerals. The gangue minerals are mainly tremolite, actinolite, diopside, calcite, dolomite, calcium iron garnet, olivine, serpentine, talc, phlogopite, chlorite, etc. Stone and garnet silicate minerals are the main, followed by calcite and dolomite-based carbonate minerals.
The structure of the ore is dominated by a dense block structure, followed by a strip-like structure. The structure of the ore is mainly vein structure, self-form, semi-automorphic granular structure, milk droplet structure and metasomatic filling structure. The mineral composition and symbiotic relationship in the ore have the following characteristics:
(1) The low-zinc magnetite ore is mainly composed of a massive structure, the ore content in the ore is high, the inlaid grain size is coarse, and the common gangue minerals are wrapped in the coarse-grained magnetite, except for the partial inlay with fine-grained flash. In addition to zinc ore, there is very little other metal sulfide in the ore.
(2) Among the sphalerite mineralized magnetite, magnetite is still the highest content of metal minerals, and there are sulfides and gangue minerals such as pyrrhotite, sphalerite, pyrite, etc. Inclusion. The gangue minerals in the ore are mainly silicates and carbonate minerals, and the mineralization of sulfides is related to the later mineralization of carbonates.
(3) The metal minerals in the zinc-bearing magnetite ore are mainly magnetite, containing a small amount of fine-grain sphalerite, and some fine-grained sphalerite and gangue minerals are sufficiently dissociated. There is a small amount of yellow in the ore. Copper ore; pyrite; coarse-grained magnetite is often wrapped with fine-grained gangue minerals, partially wrapped with fine-grain sphalerite.
(4) The size of the sphalerite is relatively coarse and closely related to magnetite, but the two are easily separated from each other in the grinding industry. The coarse sphalerite is often wrapped with fine pyrite. Sulfide, such as chalcopyrite, occasionally sees intercalated organic carbon on the edge of coarse sphalerite.
The size of magnetite and sphalerite is relatively coarse, while the size of chalcopyrite is finer. The share of magnetite in the grade of +0.074mm is 79.34%, and the share of sphalerite is 79.32%. The chalcopyrite is 30.04%; in the -0.010mm class, the chalcopyrite has the highest occupancy rate of 3.17%, while the sphalerite and magnetite have a very low occupancy rate.
Second, the test results and discussion
(1) Formulation of the test plan
For the characteristics of ore, the available process flow includes flotation-magnetic separation process and magnetic separation-flotation process. The flotation process generally has mixed flotation, preferred flotation, and other floatable processes. This experiment first carried out the exploration experiment of two beneficiation schemes: magnetic selection, floating and first floating and magnetic. The test results show that the loss rate of copper and zinc in iron concentrate is larger when using the first magnetic post-floating process, which is 41.30% and 28.52%, respectively, which affects the recovery of copper and zinc. The first floating magnetic process is effectively avoided. The loss of copper and zinc in iron concentrate, and considering that the magnetic separation tailings in the first magnetic after-floating process need to be densely processed before the flotation, which is different from the first floating magnetic process in the field. The test mainly carried out detailed research on the post-floating magnetic process.
(2) Grinding fineness test
The rough selection of grinding fineness test conditions are lime dosage of 700g / t (added to the ball mill ), water glass dosage of 1000g / t, zinc sulfate dosage of 1000g / t, inhibitor HD-1 dosage of 1000g / t, The amount of copper collector BD6 is 32g/t, the amount of oil No. 2 is 20g/t, and the flotation time is 5min. The relationship between different grinding fineness and sorting index is shown in Figure 1.
It can be seen from Fig. 1 that with the increase of grinding fineness, the copper grade and copper recovery rate in copper coarse concentrate increase, and the coarse copper concentrate is obtained when the fineness of grinding reaches -0.074mm and the grain size accounts for 80%. The copper grade and copper recovery rate are the highest, so the grinding fineness is -0.074mm and the grain size accounts for 80%.
(III) Inhibitor type and dosage test
The dosage was tested by using inhibitors such as lime, water glass, zinc sulphate and HD-1. The test results are shown in Fig. 2.
According to the results of different inhibitor dosage tests, the amount of these inhibitors was determined, which were CaO700g/t, ZnSO 4 1000g/t, ZnSO 4 1000g/t, HD-11000g/t. The inhibitor HD-1 is an inhibitor of a meta-salt sphalerite.
(4) Type test of copper collector
The collector type test was carried out using BK6, Dinghuang medicine, Yihuang medicine and butylamine black medicine. The dosage of the collector was 32g/t, and the test results are shown in Table 5. It can be seen from Table 5 that BK6 has better collection ability, so BK6 is selected as the copper collector. BK6 is an oily liquid that is easily dispersed in water.
(5) Copper selection test
The copper selection test was carried out by adding zinc sulfate 200g/t, HD-1 300g/t, and selecting time 3min. The test results are shown in Table 6.
(6) Zinc flotation test
Using lime as an inhibitor of pyrite, copper sulfate as activator, diced yellow as a collector, and No. 2 oil as a foaming agent, the zinc flotation condition test was carried out, and finally the process condition of zinc flotation was determined to be lime. The dosage is 1000g/t, the amount of copper sulfate is 200g/t, the dosage of Dinghuang is 10-20g/t, and the rough selection time is 6min.
(7) Rock field strength test
The magnetic field strength test results are shown in Fig. 3. The magnetic field strength is selected as 63.6KA/m. At this time, the iron concentrate grade is 63.91%, and the sulfur content is less than 0.5%, which has reached the qualified iron concentrate quality standard.
(8) Magnetic separation selection test
In order to obtain a high-grade iron concentrate with an iron grade of not less than 66% and a sulfur grade of not more than 0.4%, a fine coarseness test of iron coarse concentrate desulfurization flotation is carried out, the process conditions are pH=5.5, and the water glass dosage is 300 g/t. The dosage of Dinghuang was 100g/t, the amount of No. 2 oil was 60g/t, the flotation time was 6min, and the magnetic field strength of magnetic selection was 63.6KA/m. The test results are shown in Figure 4. The results show that fine grinding is beneficial to improve the grade of iron concentrate, and the fineness of grinding -0.038mm is 82%.
(9) Closed circuit test results
The principle of closed-circuit test principle is shown in Figure 5, and the results are shown in Table 7.
Third, the conclusion
(1) The test ore is a polymetallic sulfide ore. The main recovered metal elements are copper, zinc and iron, and their contents are 0.11%, 0.82% and 49.50%, respectively. The main metal minerals are magnetite, chalcopyrite, iron sphalerite, pyrrhotite, pyrite, iron ore, etc. The main gangue minerals are amphibole, actinolite, diopside, calcite, Dolomite, calcium iron garnet, olivine, serpentine, talc, phlogopite, chlorite.
(2) Qualified copper concentrate, zinc concentrate and high-grade iron concentrate are obtained by using copper-zinc-optimized flotation-zinc tailings magnetic separation-iron coarse concentrate re-grinding-magnetic selection process.
references
[1] Beijing Research Institute of Mining and Metallurgy, a small-scale test report on iron ore dressing in Heilongjiang [R].2008.
[2] Hu Xigeng, selection of non-ferrous metal sulfide ore [M]. Beijing: Metallurgical Industry Press, 1992: 230-250.
Drying Machines,are the key drying machines in a washing recycling plant.
We have Vertical type and Horizontal type supply for varies kinds of plastic application like PP PE flakes/film, PET flakes drying. The strong long shaft with many paddles on it and surrounded are the mesh screeen.The rotating speed will meet 1200rpm above which will remove the high water contents in recycled materials after washing.
Drying Machines
Drying Machines,Pipe Drying Machine,Plastic Drying Machine,Pipe Drying Equipment
Suzhou Beakeland Machinery Co., Ltd. , http://www.beakelandpm.com