CN109954591B - Flotation method for reducing sulfur content in magnetic separation iron ore concentrate - Google Patents
Flotation method for reducing sulfur content in magnetic separation iron ore concentrate Download PDFInfo
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- B03D1/02—Froth-flotation processes
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Abstract
The invention discloses a flotation method for reducing the sulfur content in magnetic separation iron ore concentrate, which belongs to the technical field of mineral processing and comprises the following steps: (1) mixing the magnetic separation iron ore concentrate; (2) roughing operation: adding an activating agent, a collecting agent and a foaming agent into the ore pulp obtained in the step (1), and performing air flotation to obtain a foam product, namely concentrate 1; (3) sweeping and selecting: and continuously adding an activating agent, a collecting agent and a foaming agent into the product in the tank after the roughing is finished to perform scavenging, wherein the foam product obtained by scavenging is concentrate 2, the concentrate 1 and the concentrate 2 are combined to form sulfur concentrate, and the product in the tank after the scavenging is finished is iron concentrate. The sulfur content in the iron ore concentrate can be reduced to be below 0.3%, and the iron recovery rate in the iron ore concentrate is more than 98.5%. Meanwhile, the adopted medicament is clean, nontoxic and convenient to transport; toxic gas is not generated, and the operating environment of a production workshop is better; the flotation process has stable foam and is easy to operate; the influence on the acidity and the alkalinity of ore pulp is small, and the corrosion phenomenon of equipment can be effectively slowed down.
Description
Technical Field
The invention belongs to the technical field of mineral processing, and particularly relates to a flotation method for reducing the sulfur content in magnetic separation iron ore concentrate.
Background
The sulfur has great harm to the performance of steel, the steel with high sulfur content has low strength at high temperature, is easy to generate hot brittleness during rolling or forging, and simultaneously, the high sulfur content brings great difficulty to blast furnace smelting, so the sulfur content in the iron ore concentrate is less and better. The iron ore concentrate with high sulfur content can be used after being treated, and the sulfur content in the iron ore concentrate is generally required to be below (0.2-0.4%). The iron ore is crushed, ground, magnetically separated, floated, reselected and the like to obtain the iron ore concentrate. Meanwhile, various metal sulfides are often associated in the iron ore, so that the sulfur content in the magnetic separation iron ore concentrate exceeds the standard, and the subsequent production requirement cannot be met. For most iron concentrates, the occurrence state of sulfur mainly exists in the form of pyrite and pyrrhotite, and the separation of sulfur from iron concentrates is usually realized by adopting a flotation method, so that the content of sulfur in the iron concentrates is reduced.
The common collecting agents for the pyrite flotation include xanthate, black powder, ethionine and the like, and of the three agents, the black powder has the weakest collecting capability on the black powderAnd can only be carried out in weakly alkaline media. Pyrrhotite is easily oxidized and argillized and is an iron sulfide mineral which is difficult to float. The flotation of pyrrhotite in alkaline and weakly acidic ore pulp requires first using Cu2+Activating or activating with small amount of sodium sulfide, and collecting with high-grade xanthate. Copper sulfate is an effective activating agent, but the activating effect is easy to disappear when the dosage is larger, so the activating effect on pyrrhotite can be well improved by adopting a sectional adding method. The pH of the medium has a significant effect on the activation of the copper sulfate. An increase in pH reduces the activation of copper sulfate, which is reduced because of the slow activation rate of copper sulfate in alkaline slurries.
Sulfuric acid is the most commonly used activator in the pyrite flotation process, but the pyrite is activated by the sulfuric acid, concentrated sulfuric acid can generate strong chemical reaction when being added into a stirring tank, acid mist in a factory is diffused, the local area of the adding point of the concentrated sulfuric acid has high concentration gradient, and the concentrated sulfuric acid and pyrite in ore pulp react violently to release virulent H2And (4) S gas. After a large amount of sulfuric acid is added, calcium and magnesium minerals in the ore pulp react to generate corresponding insoluble sulfate, so that on one hand, equipment and pipelines are seriously scaled, the equipment maintenance is not facilitated, the downstream operation is influenced, and on the other hand, part of the insoluble sulfate is more difficult to remove after entering a blast furnace. When the iron ore concentrate contains fluorite and other fluoridated minerals, fluorite can partially generate hydrofluoric acid (HF) due to the fact that the concentration of a local area and the temperature of ore pulp are higher after concentrated sulfuric acid is added. Hydrofluoric acid (HF) has an irritating odor and is highly corrosive, causing severe damage to teeth and bones, such as by vapor inhalation or contact with the skin which can form ulcers that are difficult to heal, and can strongly corrode metals, glass, and silicon-containing objects. Concentrated sulfuric acid has strong corrosivity and strong irritation, and can become a great hazard source in the processes of transportation, storage and use.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a flotation method for reducing the sulfur content in magnetic separation iron ore concentrate.
In order to achieve the purpose, the invention provides the following technical scheme:
the flotation method for reducing the sulfur content in the magnetic separation iron ore concentrate provided by the invention comprises the following steps:
(1) mixing the magnetic separation iron concentrate to obtain ore pulp;
(2) roughing operation: adding an activating agent, a collecting agent and a foaming agent into the ore pulp obtained in the step (1), and performing air flotation to obtain a foam product, namely concentrate 1;
the activating agent is one of sodium thiosulfate and ferrous sulfate or the combination of the sodium thiosulfate and the ferrous sulfate;
(3) sweeping and selecting: and continuously adding an activating agent, a collecting agent and a foaming agent into the product in the tank after the roughing is finished to perform scavenging, wherein the foam product obtained by scavenging is concentrate 2, the concentrate 1 and the concentrate 2 are combined to form sulfur concentrate, and the product in the tank after the scavenging is finished is iron concentrate.
Preferably, the collector is xanthate MA-3.
Preferably, the foaming agent is methyl isobutyl carbinol MIBC.
Preferably, in the step (1), the concentration of the pulp after size mixing is 29-46%.
Preferably, in step (2), the roughing operation: the addition amount of the activating agent is 0-400 g/t, the addition amount of the MA-3 is 60-140 g/t, and the addition amount of the MIBC is 20-60 g/t.
Preferably, in step (3), the sweep operation: the addition amount of the activating agent is 0-200 g/t, the addition amount of the MA-3 is 30-70 g/t, and the addition amount of the MIBC is 10-30 g/t.
The beneficial technical effects of the invention are as follows:
the invention provides a flotation method for reducing the sulfur content in magnetic separation iron ore concentrate, wherein the sulfur content in the iron ore concentrate can be reduced to be below 0.3%, and the iron recovery rate in the iron ore concentrate is more than 98.5%. Meanwhile, the adopted medicament is clean, nontoxic and convenient to transport; no generation of toxic gas (H)2S、HF、SO2Etc.), the operating environment of the production workshop is better; the flotation process has stable foam and is easy to operate; the influence on the acidity and the alkalinity of ore pulp is small, and the corrosion phenomenon of equipment can be effectively slowed down.
Drawings
FIG. 1 is a process flow diagram of an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
The experimental methods used in the examples of the present invention are all conventional methods unless otherwise specified, and the materials, reagents, and the like used therein are commercially available without otherwise specified.
The results of the multielement analysis of the iron concentrate obtained by low-intensity magnetic separation used in the examples are shown in table 1, and it can be seen from table 1 that the iron grade in the sample is 67.81%, and the sulfur grade is 0.67%.
TABLE 1 Multi-element analysis of samples
Example 1
The flotation method for reducing the sulfur content in the magnetic separation iron concentrate, as shown in fig. 1, includes the following steps:
(1) mixing the magnetic separation iron ore concentrate to obtain ore pulp with the concentration of 29%;
(2) roughing operation: adding an activating agent, a collecting agent and a foaming agent into the ore pulp obtained in the step (1), wherein the activating agent is sodium thiosulfate and ferrous sulfate, the using amount of the collecting agent MA-3 is 100g/t, the using amount of the foaming agent MIBC is 40g/t, performing air flotation, and obtaining a foam product through rough separation, namely concentrate 1;
(3) sweeping and selecting: and continuously adding an activating agent, a collecting agent and a foaming agent into the product in the groove after the roughing is finished for scavenging, reducing the amount of the traditional Chinese medicine agent in scavenging by half, obtaining a foam product by scavenging, namely concentrate 2, combining the concentrate 1 and the concentrate 2 to form sulfur concentrate, and obtaining the product in the groove after the scavenging is finished, namely iron concentrate.
The results of the flotation tests are shown in table 2 and can be seen from the test results: the best flotation effect is obtained when sodium thiosulfate is used as an activating agent. Under the conditions that the using amount of activating agent sodium thiosulfate is 400g/t, the using amount of collecting agent MA-3 is 100g/t and the using amount of foaming agent MIBC is 40g/t, the grade of sulfur in iron ore concentrate is 0.21%, the recovery rate of sulfur in sulfur ore concentrate is 69.5%, the grade of iron in iron ore concentrate is 67.99%, and the recovery rate of iron in iron ore concentrate is 99.0%.
TABLE 2 results of flotation desulfurization tests with different activators
Example 2
The flotation method for reducing the sulfur content in the magnetic separation iron concentrate comprises the following steps:
(1) mixing the magnetic separation iron ore concentrate to obtain ore pulp with the concentration of 29%;
(2) roughing operation: adding an activating agent, a collecting agent and a foaming agent into the ore pulp obtained in the step (1), wherein the activating agent is sodium thiosulfate, the using amount of the activating agent is (0g/t, 100g/t, 200g/t, 300g/t and 400g/t), the using amount of the collecting agent MA-3 is 100g/t, the using amount of the foaming agent MIBC is 40g/t, performing air flotation, and obtaining a foam product through rough separation as concentrate 1;
(3) sweeping and selecting: and continuously adding an activating agent, a collecting agent and a foaming agent into the product in the groove after the roughing is finished for scavenging, reducing the amount of the traditional Chinese medicine agent in scavenging by half, obtaining a foam product by scavenging, namely concentrate 2, combining the concentrate 1 and the concentrate 2 to form sulfur concentrate, and obtaining the product in the groove after the scavenging is finished, namely iron concentrate.
The results of the flotation tests are shown in Table 3 and can be seen from the test results: when the using amount of the activating agent sodium thiosulfate is 400g/t, the grade of sulfur in the iron ore concentrate is 0.24%, the recovery rate of sulfur in the sulfur ore concentrate is 65.12%, the grade of iron in the iron ore concentrate reaches 66.88%, the recovery rate of iron reaches 99.08%, and the best desulfurization effect is achieved.
TABLE 3 amount of activator used flotation desulfurization test results
Example 3
The flotation method for reducing the sulfur content in the magnetic separation iron concentrate comprises the following steps:
(1) mixing the magnetic separation iron ore concentrate to obtain ore pulp with the concentration of 29%, 32%, 36%, 39%, 43% and 46%;
(2) roughing operation: adding an activating agent, a collecting agent and a foaming agent into the ore pulp obtained in the step (1), wherein the using amount of sodium thiosulfate in the activating agent is 400g/t, the using amount of MA-3 in the collecting agent is 100g/t, the using amount of MIBC in the foaming agent is 40g/t, performing air flotation, and obtaining a foam product through rough separation, namely concentrate 1;
(3) sweeping and selecting: and continuously adding an activating agent, a collecting agent and a foaming agent into the product in the groove after the roughing is finished for scavenging, reducing the amount of the traditional Chinese medicine agent in scavenging by half, obtaining a foam product by scavenging, namely concentrate 2, combining the concentrate 1 and the concentrate 2 to form sulfur concentrate, and obtaining the product in the groove after the scavenging is finished, namely iron concentrate.
The results of the flotation tests are shown in Table 4 and can be seen from the test results: when the concentration of the flotation pulp reaches 36%, the grade of sulfur in the iron ore concentrate is 0.26%, the recovery rate of sulfur in the sulfur ore concentrate is 62.6%, the grade of iron in the iron ore concentrate is 66.93%, the recovery rate of iron in the iron ore concentrate reaches 99.1%, and the best flotation desulfurization effect is achieved.
Table 4 influence of flotation pulp concentration on sulfur grade and sulfur recovery in sulfur concentrate
Example 4
The flotation method for reducing the sulfur content in the magnetic separation iron concentrate comprises the following steps:
(1) mixing the magnetic separation iron ore concentrate to obtain pulp with the concentration of 36%;
(2) roughing operation: adding an activating agent, a collecting agent and a foaming agent into the ore pulp obtained in the step (1), wherein the using amount of the activating agent sodium thiosulfate is 400g/t, the using amount of the collecting agent is 100g/t (MA-3, MA, butyl xanthate, butyl ammonium nigride and ethyl sulfur nitrogen), the using amount of the foaming agent MIBC is 40g/t, performing air flotation, and obtaining a foam product through rough flotation, namely concentrate 1;
(3) sweeping and selecting: and continuously adding an activating agent, a collecting agent and a foaming agent into the product in the groove after the roughing is finished for scavenging, reducing the amount of the traditional Chinese medicine agent in scavenging by half, obtaining a foam product by scavenging, namely concentrate 2, combining the concentrate 1 and the concentrate 2 to form sulfur concentrate, and obtaining the product in the groove after the scavenging is finished, namely iron concentrate.
The results of the flotation tests are shown in Table 5 and can be seen from the test results: when 100g/t MA-3 is added, the grade of sulfur in the iron ore concentrate is 0.28%, the recovery rate of sulfur in the sulfur ore concentrate is 52.9%, the grade of iron in the iron ore concentrate reaches 67.99%, the recovery rate of iron in the iron ore concentrate reaches 99.3%, and the best desulfurization effect is achieved.
TABLE 5 results of flotation desulfurization test with different collectors
Example 5
The flotation method for reducing the sulfur content in the magnetic separation iron concentrate comprises the following steps:
(1) mixing the magnetic separation iron ore concentrate to obtain pulp with the concentration of 36%;
(2) roughing operation: adding an activating agent, a collecting agent and a foaming agent into the ore pulp obtained in the step (1), wherein the using amount of the activating agent sodium thiosulfate is 400g/t, the using amount of the collecting agent MA-3 is (60g/t, 80g/t, 100g/t, 120g/t and 140g/t), the using amount of the foaming agent MIBC is 40g/t, performing air flotation, and obtaining a foam product through rough concentration which is concentrate 1;
(3) sweeping and selecting: and continuously adding an activating agent, a collecting agent and a foaming agent into the product in the groove after the roughing is finished for scavenging, reducing the amount of the traditional Chinese medicine agent in scavenging by half, obtaining a foam product by scavenging, namely concentrate 2, combining the concentrate 1 and the concentrate 2 to form sulfur concentrate, and obtaining the product in the groove after the scavenging is finished, namely iron concentrate.
The results of the flotation tests are shown in Table 6 and can be seen from the test results: when the using amount of the collecting agent MA-3 is 80g/t, the sulfur grade of the iron ore concentrate is 0.24%, the recovery rate of sulfur in the sulfur ore concentrate is 68.0%, the iron grade in the iron ore concentrate reaches 67.06%, the recovery rate of iron in the iron ore concentrate reaches 98.9%, and the flotation desulfurization effect is the best.
TABLE 6 amount of collector used flotation desulfurization test results
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (4)
1. A flotation method for reducing the sulfur content in magnetic separation iron ore concentrate is characterized by comprising the following steps:
(1) mixing the magnetic separation iron concentrate to obtain ore pulp;
(2) roughing operation: adding an activating agent, a collecting agent and a foaming agent into the ore pulp obtained in the step (1), and performing air flotation to obtain a foam product, namely concentrate 1;
the activating agent is sodium thiosulfate;
(3) sweeping and selecting: continuously adding an activating agent, a collecting agent and a foaming agent into the product in the tank after the roughing is finished to perform scavenging, wherein a foam product obtained by scavenging is a concentrate 2, the concentrate 1 and the concentrate 2 are combined to form a sulfur concentrate, and the product in the tank after the scavenging is finished is an iron concentrate;
the collecting agent is xanthate MA-3;
the foaming agent is methyl isobutyl carbinol MIBC.
2. The flotation method for reducing the sulfur content in the magnetic separation iron concentrate according to claim 1, wherein in the step (1), the concentration of the pulp after size mixing is 29-46%.
3. The flotation method for reducing the sulfur content in the magnetic separation iron concentrate according to claim 1, wherein in the step (2), the roughing operation comprises the following steps: the addition amount of the activating agent is 0-400 g/t, the addition amount of the MA-3 is 60-140 g/t, and the addition amount of the MIBC is 20-60 g/t.
4. The flotation method for reducing the sulfur content in the magnetic separation iron concentrate according to claim 1, wherein in the step (3), the scavenging operation comprises the following steps: the addition amount of the activating agent is 0-200 g/t, the addition amount of the MA-3 is 30-70 g/t, and the addition amount of the MIBC is 10-30 g/t.
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