CN112551921A - Carbonization activation beneficiation technology for high-silicon magnesite - Google Patents
Carbonization activation beneficiation technology for high-silicon magnesite Download PDFInfo
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- CN112551921A CN112551921A CN202011335849.6A CN202011335849A CN112551921A CN 112551921 A CN112551921 A CN 112551921A CN 202011335849 A CN202011335849 A CN 202011335849A CN 112551921 A CN112551921 A CN 112551921A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/104—Ingredients added before or during the burning process
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
Abstract
The invention discloses a high-silicon magnesite carbonization-activation beneficiation technology, which is used for preparing high-activity MgO powder through co-grinding, magnetic separation, carbonization-activation, flotation and light burning. The dosage of the flotation reagent used in the method is 30-50% of the dosage of the traditional flotation reagent, so that the influence of the reagent on the performance of finished concentrate and tailings is reduced; the temperature is controlled more stably through microwave heating, and the product quality is more guaranteed; the high-activity MgO prepared by lightly burning magnesite concentrate in a suspension kiln has higher activity in 8-12 seconds by a citric acid method; the tailings formed by the process can be used in the field of desulfurization, and the desulfurization rate is more than 80 percent; the process has the advantages of simple flow, low cost and good social and economic benefits.
Description
Technical Field
The invention relates to the field of magnesite beneficiation, in particular to a high-silicon magnesite carbonization and activation beneficiation technology.
Background
Magnesite as one kind of material for metallurgy, building material and chemical industryImportant nonmetallic minerals in industries such as industry and the like play an important role in national economy production and life. Magnesite is one of the dominant mineral resources in China, the reserve accounts for about 75% of the total world amount, and Liaoning province is the region with the most magnesite reserve in China, and accounts for about 85.6% of the whole country. Magnesite belongs to non-renewable resources, and the storage amount of high-grade magnesite is obviously reduced by long-term large-scale mining. Only high-grade magnesite with MgO content higher than 46% can be used as commercial grade magnesite. The high-silicon magnesite accounts for over 1/3 of magnesite reserves in China, belongs to low-grade magnesite, and SiO of the low-silicon magnesite2More than 3% of SiO2Higher levels can reduce the performance of the article. Along with the gradual increase of the use amount of commercial-grade magnesite, the comprehensive utilization of high-silicon magnesite has important significance.
The determination of the magnesite beneficiation mode mainly needs to consider the impurity chemical composition, physical characteristics and concentrate grade of the ore. At present, the main ore dressing modes are flotation, thermal separation, gravity separation, electric separation and the like. The flotation method is used for screening and purifying according to the difference of the surface physical and chemical properties of magnesite and impurity minerals, and is the most extensive beneficiation method at present. The proper ore dressing process can solve the problem of separating silicate gangue mineral from magnesite, increase MgO content in the concentrate and remove SiO2And the like, thereby improving the magnesite grade. However, the current problems of flotation processes are mainly reflected in: firstly, uncertainty of influence of a beneficiation reagent on the performance of finished concentrate; secondly, the comprehensive utilization technology of flotation tailings needs to be further improved. Therefore, the research and the application of a high-silicon magnesite carbonization and activation beneficiation technology are urgent.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a high-silicon magnesite carbonization and activation beneficiation technology which is simple to operate and low in cost.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a high-silicon magnesite carbonization-activation beneficiation technology is characterized by comprising the following specific operation steps:
firstly, grinding 95-99% of high-silicon magnesite with the granularity less than 20mm and 1-5% of anthracite with the granularity less than 20mm to 150-200 meshes in percentage by mass to obtain raw material powder;
the high-silicon magnesite is magnesite with silicon content more than 3%;
the carbon content of the anthracite is more than 90%, and the volatile matter is less than 10%;
removing iron in the material powder and iron impurities mixed in the crushing and co-grinding processes by magnetic separation to obtain material powder;
carbonizing and activating the material powder in a microwave heating mode to obtain carbonized and activated material powder;
performing ore dressing on the carbonized and activated material powder by using a reverse flotation process to obtain concentrate powder and tailing powder;
and step five, carrying out light burning on the concentrate powder at the temperature of 750-plus-one and 950 ℃ by adopting a suspension kiln, preserving the heat for 30-90min to obtain high-activity MgO powder, and carrying out light burning on the tailing powder at the temperature of 750-plus-one and 900 ℃ by adopting the suspension kiln, preserving the heat for 20-60min to obtain the active MgO powder.
The co-grinding equipment in the first step is a tube mill or a cylinder mill.
The heating system of the microwave heating in the step two is 2-10 ℃/min, the temperature is increased to 500 ℃ at 300-.
Anthracite reacts with air to generate carbon dioxide, magnesite powder is dispersed in carbon dioxide atmosphere, and the specific surface area of the powder after carbonization and activation is increased by 25-35%; impurities such as Si in the concentrate can be removed through reverse flotation; the high-activity MgO powder has smaller particle size, larger specific surface area and easy reaction.
Compared with the prior art, the invention has the beneficial effects that: 1) the impurities in the magnesite grain boundary are carbonized and activated, so that the impurities are easier to react with a flotation reagent, the dosage of the reagent is reduced, and the influence of the reagent on the performance of finished concentrate and tailings is reduced. Compared with the prior art, the dosage of the flotation reagent is 30-50% of that of the traditional flotation reagent; 2) the tailings prepared by the process have higher activity, and can be directly used as a desulfurizer for high-temperature flue gas, such as a flue gas desulfurizer used for sintered ores in metallurgical industry and a desulfurizer used in the coking field; 3) the stability of temperature is controlled by microwave heating, and the microwave heating has the characteristic of uniform heating temperature; 4) the high-activity MgO prepared by lightly burning magnesite concentrate in a suspension kiln has higher activity in 30-60 seconds by a citric acid method; the tailings produced by the process can be used in the field of desulfurization, and the desulfurization rate is more than 80 percent; 4) the process has the advantages of simple flow, low cost and good social and economic benefits.
Drawings
Fig. 1 is a flow chart of a carbonization activation beneficiation technique for high-silicon magnesite according to an embodiment of the present invention.
Detailed Description
The preparation process of the present invention is further illustrated below with reference to examples and figures:
example 1
Step one, grinding 95kg of high-silicon magnesite with the granularity less than 20mm and 5kg of anthracite with the granularity less than 20mm to 150-200 meshes through a tube mill to obtain raw material powder;
removing iron in the material powder and iron impurities mixed in the crushing and co-grinding processes by magnetic separation to obtain material powder;
step three, carbonizing and activating the material powder by adopting a microwave heating mode, heating to 400 ℃ at a heating rate of 5 ℃/min, and preserving heat for 3 hours, wherein the specific surface area of the carbonized and activated powder is increased by 30%;
step four, performing a reverse flotation process of 1-time roughing and 1-time fine selection on carbonized and activated material powder, wherein an SF-20 type flotation machine is adopted for flotation, 1000g/t hydrochloric acid is adopted to adjust the pH value of ore pulp to 6, stirring is continued for 5min, 600g/t water glass is added, stirring is performed for 3min, 400g/t dodecylamine is added, stirring is performed for 3min, finally, air inflation and foam scraping are performed for 10mm, and the amount of fine selection agent is half of that of the coarse selection, so that concentrate and tailings are obtained;
step five, lightly burning the concentrate powder at 750 ℃ by adopting a suspension kiln, and preserving heat for 30min to obtain high-activity MgO powder; and lightly burning the tailing powder at 750 ℃ by adopting a suspension kiln, and keeping the temperature for 20min to obtain active MgO powder.
In the embodiment, impurities in the magnesite grain boundary are carbonized and activated and are easier to react with a flotation reagent, and the dosage of the flotation reagent is 35% of that of the traditional flotation reagent; 75kg of concentrate and 25kg of tailings obtained by the flotation process; the activity of the obtained high-activity MgO powder is higher in 8 seconds by a citric acid method; the obtained active MgO powder is used in the field of desulfurization, and the desulfurization rate is 85%.
CN 109942210A "a method for preparing high-activity magnesium oxide from magnesite", the CAA value of which is 13-15s detected by citric acid. The activity of the high-activity MgO powder prepared by the method is 8s, and is higher than that of patent CN 109942210A; the tailings are fully utilized to prepare active MgO powder for the field of desulfurization, and the desulfurization rate is 85%.
Example 2
Step one, grinding 99kg of high-silicon magnesite with the granularity less than 20mm and 1kg of anthracite with the granularity less than 20mm to 150-200 meshes through a tube mill to obtain raw material powder;
removing iron in the material powder and iron impurities mixed in the crushing and co-grinding processes by magnetic separation to obtain material powder;
step three, carbonizing and activating the material powder by adopting a microwave heating mode, heating to 350 ℃ at a heating rate of 3 ℃/min, and preserving heat for 2 hours, wherein the specific surface area of the carbonized and activated powder is increased by 25%;
step four, performing a reverse flotation process of 1-time roughing and 1-time fine selection on carbonized and activated material powder, wherein an SF-20 type flotation machine is adopted for flotation, 1000g/t hydrochloric acid is adopted to adjust the pH value of ore pulp to 6, stirring is continued for 5min, 600g/t water glass is added, stirring is performed for 3min, 400g/t dodecylamine is added, stirring is performed for 3min, finally, air inflation and foam scraping are performed for 10mm, and the amount of fine selection agent is half of that of the coarse selection, so that concentrate and tailings are obtained;
step five, lightly burning the concentrate powder at 850 ℃ by adopting a suspension kiln, and keeping the temperature for 60min to obtain high-activity MgO powder; and lightly burning the tailing powder at 850 ℃ by adopting a suspension kiln, and keeping the temperature for 40min to obtain active MgO powder.
In the embodiment, impurities in the magnesite grain boundary are carbonized and activated, and are easier to react with a flotation reagent, and the dosage of the flotation reagent is 40% of that of the traditional flotation reagent; 70kg of concentrate and 30kg of tailings obtained by the flotation process; the activity of the obtained high-activity MgO powder is higher in 10 seconds by a citric acid method; the obtained active MgO powder is used in the field of desulfurization, and the desulfurization rate is 83 percent.
CN 109942210A "a method for preparing high-activity magnesium oxide from magnesite", the CAA value of which is 13-15s detected by citric acid. The activity of the high-activity MgO powder prepared by the method is 10s by a citric acid method, and is higher than that of patent CN 109942210A; the tailings are fully utilized to prepare active MgO powder which is used in the field of desulfurization, and the desulfurization rate is 83 percent.
Example 3
Step one, 97kg of high-silicon magnesite with the granularity less than 20mm and 3kg of anthracite with the granularity less than 20mm are ground to 150-mesh and 200-mesh through a tube mill to obtain raw material powder;
removing iron in the material powder and iron impurities mixed in the crushing and co-grinding processes by magnetic separation to obtain material powder;
step three, carbonizing and activating the material powder by adopting a microwave heating mode, heating to 450 ℃ at a heating rate of 8 ℃/min, preserving heat for 4 hours, and increasing the specific surface area of the carbonized and activated powder by 35%;
step four, performing a reverse flotation process of 1-time roughing and 1-time fine selection on the carbonized and activated material powder, adjusting the pH value of the ore pulp to 6 by adopting 1000g/t hydrochloric acid through an SF-20 type flotation machine in the flotation process, continuing stirring for 5min, adding 600g/t water glass, stirring for 3min, adding 400g/t dodecylamine, stirring for 3min, finally, performing air inflation and foam scraping for 10mm, wherein the dosage of a fine selection medicament is half of that of the coarse selection, and thus obtaining the concentrate and the tailings.
Step five, lightly burning the concentrate powder at 950 ℃ by adopting a suspension kiln, and preserving heat for 90min to obtain high-activity MgO powder; and lightly burning the tailing powder at 900 ℃ by adopting a suspension kiln, and keeping the temperature for 60min to obtain active MgO powder.
In the embodiment, impurities in the magnesite grain boundary are carbonized and activated and are easier to react with a flotation reagent, and the dosage of the flotation reagent is 50% of that of the traditional flotation reagent; 80kg of concentrate and 20kg of tailings obtained by the flotation process; the activity of the obtained high-activity MgO powder is higher in 12 seconds by a citric acid method; the obtained active MgO powder is used in the field of desulfurization, and the desulfurization rate is 80%.
CN 109942210A "a method for preparing high-activity magnesium oxide from magnesite", the CAA value of which is 13-15s detected by citric acid. The activity of the high-activity MgO powder prepared by the method is 12s by a citric acid method, and is higher than that of patent CN 109942210A; the tailings are fully utilized to prepare active MgO powder which is used in the field of desulfurization, and the desulfurization rate is 80%.
Claims (3)
1. A high-silicon magnesite carbonization-activation beneficiation technology is characterized by comprising the following specific operation steps:
firstly, grinding 95-99% of high-silicon magnesite with the granularity less than 20mm and 1-5% of anthracite with the granularity less than 20mm to 150-200 meshes in percentage by mass to obtain raw material powder;
the high-silicon magnesite is magnesite with silicon content more than 3%;
the carbon content of the anthracite is more than 90%, and the volatile matter is less than 10%;
removing iron in the material powder and iron impurities mixed in the crushing and co-grinding processes by magnetic separation to obtain material powder;
carbonizing and activating the material powder in a microwave heating mode to obtain carbonized and activated material powder;
performing ore dressing on the carbonized and activated material powder by using a reverse flotation process to obtain concentrate powder and tailing powder;
and step five, carrying out light burning on the concentrate powder at the temperature of 750-plus-one and 950 ℃ by adopting a suspension kiln, preserving the heat for 30-90min to obtain high-activity MgO powder, and carrying out light burning on the tailing powder at the temperature of 750-plus-one and 900 ℃ by adopting the suspension kiln, preserving the heat for 20-60min to obtain the active MgO powder.
2. The carbonization-activation beneficiation technology for high-silicon magnesite according to claim 1, wherein the co-grinding equipment in the first step is a tube mill or a barrel mill.
3. The carbonization-activation beneficiation technology for high-silicon magnesite according to claim 1, wherein the temperature rise system of microwave heating in the third step is 2-10 ℃/min, the temperature rises to 500 ℃ at 300-.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113083496A (en) * | 2021-04-02 | 2021-07-09 | 中建材蚌埠玻璃工业设计研究院有限公司 | Method for enriching magnesium-containing minerals in asbestos tailings |
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