a dense block and bean hematite sorting
I. Introduction
With the development of national economic construction, steel demand is growing, shortage of iron ore resources have become increasingly prominent, the development and use of local iron ore resources is imperative. The sedimentary metamorphic iron ore deposits in a certain area of ​​Anhui Province have a certain scale and have not been exploited. In order to fully exploit and utilize the mine resources and better serve the local economic construction and development, a mining company commissioned the Maanshan Mine Research Institute of Sinosteel to conduct iron ore beneficiation process tests. When the final result of the ore dressing test is 63.18% of the concentrate grade, the concentrate yield is 20.15%, and the recovery rate is 29.97%. The iron concentrate grade was 60.87%, the concentrate yield was 29.39%, and the recovery rate was 42.12%.
2. Study on mineralogical characteristics of ore dressing process
(1) Raw ore properties
The results of multi-element analysis of raw ore are shown in Table 1. The results of sieve size analysis of 2~0mm ore are shown in Table 2.
(2) Ore structure, structure and natural type
Ore structure: There is a dense block structure. According to the mineral composition, structure and structural characteristics of the ore, the ore is confirmed by mineral grinding tablets to be a scorpion-like and dense block hematite. The test sample is mainly the latter.
Table 1 Multi-element analysis results of raw ore
element | TFe | SFe | FeO | Al 2 O 3 | CaO | MgO | SiO 2 | P | S | Burnt out |
content(%) | 42.46 | 41.93 | 0.92 | 5.62 | 0.16 | 0.28 | 28.53 | 0.018 | 0.019 | 1.82 |
This mainly of iron ore can be seen from Table 1, followed by silica and aluminum oxide and small amounts of sulfur, phosphorus and the like. The mineral iron grade was tested to be 42.46%.
Table 2 results of 0~2mm particle size analysis of ore
Size (mm) | Yield(%) | Iron grade (%) | Recovery rate(%) |
+0.355 | 68.84 | 43.30 | 70.14 |
-0.355+0.125 | 18.59 | 38.20 | 16.71 |
-0.125+0.098 | 2.02 | 41.65 | 1.98 |
-0.098+0.076 | 1.51 | 44.37 | 1.57 |
-0.076+0.0385 | 4.52 | 44.56 | 4.73 |
-0.0385 | 4.52 | 45.89 | 4.87 |
total | 100.00 | 42.50 | 100.00 |
The results of the ore size analysis of Table 2 show that the iron grade distribution is relatively uniform in the range of 0-2 mm.
Third, the ore dressing process test research
According to the nature of the ore, the ore dressing test was carried out by a single re-election, magnetic separation-re-election, magnetic separation-flotation combined sorting process. Firstly, the grinding fineness test is carried out to determine the suitable particle size range. According to the particle size condition test results, a series of tests are carried out on the process conditions of the three processes.
(1) Re-election grinding fineness test
The results of re-election grinding fineness test are shown in Table 3.
Table 3 Results of re-election grinding fineness test
-0.076mm (%) | product name | Yield(%) | Iron grade (%) | Recovery rate(%) |
65 | Concentrate Medium mine Tailings Raw ore | 47.15 23.80 29.05 100.00 | 52.70 21.72 42.84 42.47 | 58.51 12.18 29.31 100.00 |
78 | Concentrate Medium mine Tailings Raw ore | 45.30 22.30 32.40 100.00 | 52.34 22.02 42.94 42.53 | 55.26 12.03 32.71 100.00 |
87 | Concentrate Medium mine Tailings Raw ore | 34.71 22.11 35.76 | 55.32 36.00 42.58 42.58 | 45.09 19.31 35.60 100.00 |
92 | Concentrate Medium mine Tailings Raw ore | 11.80 46.40 41.80 100.00 | 64.65 39.86 35.91 42.47 | 17.97 39.22 42.81 100.00 |
The test results in Table 3 show that with the improvement of grinding fineness, the grade of concentrate is gradually increased, and the recovery rate is obviously reduced. When the fineness -0.076mm accounts for 65%, the concentrate grade is 52.70%, and the recovery rate is 58.51%. When the fineness is -0.076mm, 92%, the concentrate grade is 64.65%, and the recovery rate is only 17.97%. Therefore, the grinding grain size suitable for ensuring the concentrate grade is -0.076mm and more than 90%.
(II) Experimental study on magnetic-floating process
The ore sample is a weak magnetic mineral. The final qualified iron concentrate cannot be obtained by magnetic separation. The purpose of magnetic separation is to select: one is to enrich the iron mineral, and the other is to remove part of the slime. When the grinding fineness 0.076mm accounted for 92%, the magnetic separation adopts high gradient strong magnetic separator, the field strength is 875.8KA/m, the flow is a rough sweep, and some coarse and fine magnetic sand and tailings are obtained. As the flotation of the ore, the magnetic separation tailings as the final tailings, the results of the magnetic separation test are shown in Table 4.
Table 4 Magnetic separation test results
Magnetic field strength KA/m | product name | Yield(%) | Iron grade (%) | Recovery rate(%) |
875.8 | Concentrate Tailings Raw ore | 56.75 43.25 100.00 | 56.91 23.82 42.60 | 75.82 24.18 100.00 |
The flotation test is carried out when the ore grade is 56.91%. The flotation reagent includes the ore adjuster NaOH, the inhibitor starch, the activator CaO, and the collector anion MZ-21. The results of the flotation test are shown in Table 5.
Table 5 Flotation test results
Pharmacy and dosage g/t | product name | Yield(%) | Iron grade (%) | Recovery rate(%) |
NaOH 1000, starch 1500, CaO 500 MZ-21 400 | Concentrate Tailings Raw ore | 79.52 20.48 100.00 | 57.80 53.46 56.91 | 80.76 19.24 100.00 |
It can be seen from the test results in Table 5 that the flotation grade is only increased by 0.59 percentage points when the ore grade is 56.91%, although the removal of a large amount of slime by magnetic separation, the grinding fineness -0.076mm has reached 92%. ,. The flotation effect is not obvious. It is not suitable to use a flotation method for treating dense colloidal and bismuth hematite. Cationic reverse flotation is essentially the same as anion flotation.
(III) Experimental study on magnetic separation-reselection process
Magnetic separation: high gradient magnetic separator, field strength 875.8KA/m, re-election shaker. When the grinding fineness is -0.076mm90%, the magnetic separation is coarsely selected to obtain coarse concentrate and tailings, and the coarse concentrate is re-ground into the re-election operation. The results of the magnetic separation test are shown in Table 6.
Table 6 Magnetic separation test results
Magnetic field strength KA/m | product name | Yield(%) | Iron grade (%) | Recovery rate(%) |
875.8 | Concentrate Tailings Raw ore | 57.58 42.42 100.00 | 54.80 26.45 42.77 | 73.77 26.23 100.00 |
Re-election: The re-election equipment adopts a shaker (the same below), and the test results of the shaker are shown in Table 7.
Table 7 Shake test results
product name | Yield(%) | Iron grade (%) | Metal ratio (%) | Recovery rate(%) | ||||
γ | accumulation | β | accumulation | Ï | accumulation | ε | accumulation | |
Concentrate 1 | 15.50 | 63.39 | 9.83 | 18.01 | ||||
Concentrate 2 | 19.75 | 35.25 | 62.22 | 62.75 | 12.29 | 22.12 | 22.52 | 40.53 |
Concentrate 3 | 22.68 | 57.93 | 56.13 | 60.16 | 12.73 | 34.85 | 23.33 | 63.86 |
Medium mine | 20.14 | 78.07 | 39.52 | 54.84 | 9.96 | 42.81 | 14.59 | 78.45 |
Tailings | 21.93 | 53.61 | 11.76 | 21.55 | ||||
Give mine | 100.00 | 54.57 | 54.57 | 100.00 | ||||
The test results in Table 7 show that when the fineness of grinding -0.076mm accounts for 90%, after the strong magnetic separation, the coarse concentrate enters the shaker, and the iron concentrate yield is 15.50%, the grade is 63.39%, and the recovery rate is 18.01. The % index or concentrate yield is 35.25%, the concentrate grade is 62.75%, and the recovery rate is 40.53%.
Table 8 Magnetic separation - re-election test results
Iron grade (%) | Recovery rate(%) |
63.39 | 13.29 |
62.75 | 29.90 |
60.16 | 47.10 |
(IV) Experimental study on re-election (shaker) process
It can be seen from the grinding fineness test that when the mine uses a section of grinding to reach the monomer dissociation, the tailings loss is greater when the re-election is selected. For this reason, stage grinding is preferred. The shaker test was carried out under the condition of grinding fineness -0.076mm and 65%. The process adopts three-stage grinding three-stage sorting, that is, the concentrate obtained by the first shaker, as the concentrate, the middle mine combined with the grinding After the mine, as the second section of the ore to the ore (grinding fineness -0.076mm accounted for 80%), tailings as the final tailings, the second section of the selected concentrate as a concentrate product, the middle mine combined with grinding As the third section of the ore (grinding fineness -0.076mm accounted for 90%), the second selected middle mine and the third selected middle mine merged into the total middle mine, and finally three separate The concentrate of the operation is merged into the final concentrate,
The re-election process and the re-selection number quality process are shown in Table 8 and Figure 1, respectively.
Table 9 Re-election test results
Final product | product name | Yield(%) | Iron grade (%) | Recovery rate(%) | |||
γ | accumulation | β | accumulation | ε | accumulation | ||
Concentrate | Concentrate 1 Concentrate 2 Concentrate 3 Concentrate 4 | 7.58 10.20 2.37 9.24 | 20.15 | 63.72 62.89 62.69 55.88 | 63.18 | 11.37 15.09 3.51 | 29.97 |
total | 29.39 | 60.87 | 42.12 | ||||
Middle mine | Middle mine 1 Middle mine 2 | 11.77 6.00 | 17.77 | 35.60 46.17 | 9.87 6.52 | 16.39 | |
total | 17.77 | 41.50 | 16.39 | ||||
Tailings | Tailings | 52.84 | 33.34 | 41.49 | |||
total | 100.00 | 42.47 | 100.00 | ||||
It can be seen from the results of Table 9 that using the three-stage grinding re-election process, the iron concentrate grade is 63.18%, the concentrate yield is 20.15%, the recovery rate is 29.97%, or the iron concentrate grade is 60.87%, and the concentrate yield is 29.39%. , the recovery rate of 42.12% of the indicator
Fourth, the conclusion
(1) Using the three-stage refining three-stage re-election process, the concentrate yield is 20.15%, the concentrate grade is 63.18%, the recovery rate is 29.97%, or the iron concentrate grade is 60.87%, the concentrate yield is 29.39%, and the recovery rate is 42.12%. . However, the single re-election process requires a three-stage grinding process.
(2) The "magnetic-heavy" sorting process, which can abandon a large number of tailings after magnetic first, is beneficial to re-election, and the process is simple, but the investment is large.
(3) Using the "magnetic-floating" sorting result, the flotation iron grade is only increased by 0.89% at 56.91% of the magnetic fines, and the separation of the dense colloidal and the pseudo-hematite by the flotation method is not ideal.
(4) The selection of braided and dense block hematite is difficult to beneficiated. There is no good method for sorting this type of ore, and the recovery rate is low. If the mineral is selected, the concentrate grade should be 60%, otherwise the concentrate recovery rate will be too large.
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