CN110002772B - Method for preparing magnesium oxide from low-grade magnesite - Google Patents
Method for preparing magnesium oxide from low-grade magnesite Download PDFInfo
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- CN110002772B CN110002772B CN201910302189.2A CN201910302189A CN110002772B CN 110002772 B CN110002772 B CN 110002772B CN 201910302189 A CN201910302189 A CN 201910302189A CN 110002772 B CN110002772 B CN 110002772B
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- 239000001095 magnesium carbonate Substances 0.000 title claims abstract description 43
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 title claims abstract description 43
- 235000014380 magnesium carbonate Nutrition 0.000 title claims abstract description 43
- 229910000021 magnesium carbonate Inorganic materials 0.000 title claims abstract description 43
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 27
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 238000007885 magnetic separation Methods 0.000 claims abstract description 22
- 238000001354 calcination Methods 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000012216 screening Methods 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims description 43
- 241001584775 Tunga penetrans Species 0.000 claims description 22
- 239000006148 magnetic separator Substances 0.000 claims description 16
- 239000012141 concentrate Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005188 flotation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000008396 flotation agent Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
-
- 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
- C04B2/102—Preheating, burning calcining or cooling of magnesia, e.g. dead burning
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention provides a method for preparing magnesium oxide from low-grade magnesite, which comprises the following steps: crushing and classifying, calcining, screening and classifying, reselecting, magnetically separating, mixing and calcining and the like. The invention adopts the pre-calcining-classifying-reselecting-magnetic separation-re-calcining process, firstly, the low-grade magnesite is calcined under the low-temperature condition, mgCO 3 can be incompletely decomposed to generate CO, the CO can play a role of reducing gas, the weak magnetic iron ore in the magnesite is reduced into strong magnetic iron ore, then the classification is carried out, different reselection and magnetic separation processes are selected according to the characteristics of the magnesite with different particle grades, finally, the purified magnesite is mixed and calcined, the obtained magnesia grade is more than 98.5%, the low-grade magnesite is fully utilized, the low-grade magnesite is reasonably utilized as resources, the utilization rate of the resources is improved, the occupied area is reduced, and the invention has better social benefit and economic benefit.
Description
Technical Field
The invention relates to the technical field of low-grade magnesite beneficiation, in particular to a method for preparing magnesium oxide from low-grade magnesite.
Background
The magnesite resources in China are rich in reserves, the reserves are proved to be about 31 hundred million t and account for one fourth of the total reserves in the world, the reserves are mainly distributed in Liaoning and Shandong provinces, the total reserves account for about 95.11% of the total reserves in the world, liaoning provinces are mainly concentrated in Liaoning south areas, such as areas of sea cities, barracks and the like, the reserves are proved to be 12, the reserves are 25.77 hundred million t, the reserves account for about 85% of the total reserves in the world, and the reserves account for 20% of the total reserves in the world. However, due to the continuous development of magnesite resources and the continuous improvement of the requirements of magnesium salt products with high added value on raw materials, the magnesite (the content of magnesium oxide is 43% -47.8%) which can directly meet the production requirements is less and less. Meanwhile, due to rough management of magnesite resources, high-quality resources are relatively short. It is more remarkable that the large amount of waste of the low-grade magnesite not only causes huge waste of resources, but also pollutes the surrounding environment. The main impurities in the magnesite comprise CaO, al 2O3、SiO2、Fe2O3 and the like, and the high impurity content directly leads to the reduction of MgO content in the magnesite, thereby leading to the consequences of the reduction of the quality of derived products, the increase of production cost, the damage of ecological environment and the like. Regarding the purification method of low-grade magnesite, flotation and chemical purification are mainly adopted in the industry at present, the investment of flotation process equipment is large, the process flow is complex, the production cost is high, and a flotation agent and a large amount of water resources are needed to be used, so that environmental pollution and waste of water resources are caused. The chemical purification method has more complex process flow, difficult control of process parameters, difficult zero discharge of chemical agents in the production process and high production cost, so that the chemical purification method is not applied to industrial production substantially.
Disclosure of Invention
The invention aims to provide a method for preparing magnesium oxide from low-grade magnesite, which aims to solve the problems in the background technology.
The technical scheme of the invention is realized as follows:
A method for preparing magnesium oxide from low-grade magnesite comprises the following steps:
(1) Crushing and screening magnesite to obtain a roasting raw material;
(2) Feeding the roasting raw material in the step (1) into a rotary kiln for roasting for 30-40 min, and then cooling to room temperature;
(3) Crushing magnesite after calcining in the step (2), and grading by a double-layer vibration sieve to obtain a raw material of-6 mm, a raw material of 6-12 mm and a raw material of 12-20 mm;
(4) Sending the raw material with the diameter of-6 mm into a jigger for reselection and sorting to obtain a light product with the diameter of-6 mm and a heavy product with the diameter of-6 mm;
(5) Feeding the raw materials with the thickness of 6-12 mm into a shaking table for reselection and sorting to obtain a light product with the thickness of 6-12 mm and a heavy product with the thickness of 6-12 mm;
(6) Sending the raw materials with the diameter of 12-20 mm into a jigger for reselection and sorting to obtain light products with the diameter of 12-20 mm and heavy products with the diameter of 12-20 mm;
(7) Feeding the light products of the step (4) -6mm into a magnetic separator for magnetic separation to obtain magnetic concentrate of-6 mm and magnetic tailings of-6 mm;
(8) Feeding the light products with the diameter of 6-12 mm in the step (5) into a magnetic separator for magnetic separation to obtain magnetic concentrate with the diameter of 6-12 mm and magnetic tailings with the diameter of 6-12 mm;
(9) Filtering and drying the tailings subjected to magnetic separation in the steps (7) -6mm and the light products subjected to the steps (6) and 12-20 mm, wherein the moisture is less than 5%, and then uniformly mixing the tailings subjected to magnetic separation in the steps (8) and 6-12 mm to obtain a mixture;
(10) And (3) sending the mixture obtained in the step (9) into a rotary kiln for calcination for 1-2 hours, and then cooling to room temperature to obtain a magnesium oxide product.
Preferably, the particle size of the roasting raw material in the step (1) is less than 20mm.
Preferably, the calcining temperature in the step (2) is 580-680 ℃.
Preferably, the jigger in the step (4) is a double-vibration jigger, and the concentration of ore pulp of the jigger is 20% -25%.
Preferably, the cradle in the step (5) is a wind power cradle.
Preferably, the jigger in the step (6) is a diaphragm jigger, and the concentration of ore pulp of the jigger is 20% -25%.
Preferably, the magnetic separator in the step (7) is a high-gradient magnetic separator, and the magnetic field strength is 1.2T-1.5T.
Preferably, the magnetic separator in the step (8) is a dry magnetic separator, and the magnetic field strength is 0.8T-1.0T.
Preferably, the calcining temperature in the step (10) is 750-850 ℃.
The beneficial effects of the invention are as follows:
The invention adopts the pre-calcining-classifying-reselecting-magnetic separation-re-calcining process, firstly, the low-grade magnesite is calcined under the low-temperature condition, mgCO 3 can be incompletely decomposed to generate CO, the CO can play a role of reducing gas, the weak magnetic iron ore in the magnesite is reduced into strong magnetic iron ore, then the classification is carried out, different reselection and magnetic separation processes are selected according to the characteristics of the magnesite with different particle grades, finally, the purified magnesite is mixed and calcined, the obtained magnesia grade is more than 98.5%, the low-grade magnesite is fully utilized, the low-grade magnesite is reasonably utilized as resources, the utilization rate of the resources is improved, the occupied area is reduced, and the invention has better social benefit and economic benefit.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The magnesium oxide content of the Liaoning low-grade magnesite is 41.08%, the SiO 2 content is 3.01%, the CaO content is 3.22% and the TFe content is 1.25%.
Example 1
A method for preparing magnesium oxide from low-grade magnesite comprises the following steps:
(1) Crushing and screening magnesite to obtain a roasting raw material;
(2) Feeding the roasting raw material in the step (1) into a rotary kiln for roasting for 40min, wherein the roasting temperature is 580 ℃, and then cooling to room temperature;
(3) Crushing magnesite after calcining in the step (2), and grading by a double-layer vibration sieve to obtain a raw material of-6 mm, a raw material of 6-12 mm and a raw material of 12-20 mm;
(4) Sending the raw material with the thickness of-6 mm into a re-vibrating jigger for re-selecting, wherein the concentration of ore pulp is 20%, and obtaining a light product with the thickness of-6 mm and a heavy product with the thickness of-6 mm;
(5) The method comprises the steps of (1) conveying raw materials with the thickness of 6-12 mm into a wind power shaking table for reselection and sorting to obtain light products with the thickness of 6-12 mm and heavy products with the thickness of 6-12 mm;
(6) Feeding the raw materials with the thickness of 12-20 mm into a diaphragm jigger for reselection and sorting, wherein the concentration of ore pulp is 20%, and obtaining light products with the thickness of 12-20 mm and heavy products with the thickness of 12-20 mm;
(7) Feeding the light products with the thickness of between 4 and 6mm in the step (4) into a high-gradient magnetic separator for magnetic separation, wherein the magnetic field strength is 1.5T, and obtaining magnetic concentrate with the thickness of between 6mm and magnetic tailings with the thickness of between 6 mm;
(8) Feeding the light products with the thickness of 6-12 mm in the step (5) into a dry magnetic separator for magnetic separation, wherein the magnetic field strength is 1.0T, and 6-12 mm magnetic concentrate and 6-12 mm magnetic tailings are obtained;
(9) Filtering and drying the tailings subjected to magnetic separation in the steps (7) -6mm and the light products subjected to the steps (6) and 12-20 mm, wherein the moisture is less than 5%, and then uniformly mixing the tailings subjected to magnetic separation in the steps (8) and 6-12 mm to obtain a mixture;
(10) And (3) feeding the mixture obtained in the step (9) into a rotary kiln for calcination for 2 hours, wherein the calcination temperature is 750 ℃, and then cooling to room temperature to obtain a magnesium oxide product.
The light burned magnesia prepared in the embodiment has 98.55 percent of magnesia, 0.30 percent of CaO, 0.29 percent of SiO 2 and 0.30 percent of TFe.
Example 2
A method for preparing magnesium oxide from low-grade magnesite comprises the following steps:
(1) Crushing and screening magnesite to obtain a roasting raw material;
(2) Feeding the roasting raw material in the step (1) into a rotary kiln for roasting for 35min, wherein the roasting temperature is 630 ℃, and then cooling to room temperature;
(3) Crushing magnesite after calcining in the step (2), and grading by a double-layer vibration sieve to obtain a raw material of-6 mm, a raw material of 6-12 mm and a raw material of 12-20 mm;
(4) Sending the raw material with the thickness of-6 mm into a re-vibrating jigger for re-selecting, wherein the concentration of ore pulp is 25%, and obtaining a light product with the thickness of-6 mm and a heavy product with the thickness of-6 mm;
(5) The method comprises the steps of (1) conveying raw materials with the thickness of 6-12 mm into a wind power shaking table for reselection and sorting to obtain light products with the thickness of 6-12 mm and heavy products with the thickness of 6-12 mm;
(6) Feeding the raw materials with the thickness of 12-20 mm into a diaphragm jigger for reselection and sorting, wherein the concentration of ore pulp is 25%, and obtaining light products with the thickness of 12-20 mm and heavy products with the thickness of 12-20 mm;
(7) Feeding the light products with the thickness of between 4 and 6mm in the step (4) into a high-gradient magnetic separator for magnetic separation, wherein the magnetic field strength is 1.3T, and obtaining magnetic concentrate with the thickness of between 6mm and magnetic tailings with the thickness of between 6 mm;
(8) Feeding the light products with the thickness of 6-12 mm in the step (5) into a dry magnetic separator for magnetic separation, wherein the magnetic field strength is 0.9T, and 6-12 mm magnetic concentrate and 6-12 mm magnetic tailings are obtained;
(9) Filtering and drying the tailings subjected to magnetic separation in the steps (7) -6mm and the light products subjected to the steps (6) and 12-20 mm, wherein the moisture is less than 5%, and then uniformly mixing the tailings subjected to magnetic separation in the steps (8) and 6-12 mm to obtain a mixture;
(10) And (3) feeding the mixture obtained in the step (9) into a rotary kiln for calcination for 1.5 hours, wherein the calcination temperature is 800 ℃, and then cooling to room temperature to obtain a magnesium oxide product.
The light burned magnesia prepared in this example has 98.59% magnesia content, 0.28% CaO content, 0.27% SiO 2 content and 0.27% TFe content.
Example 3
A method for preparing magnesium oxide from low-grade magnesite comprises the following steps:
(1) Crushing and screening magnesite to obtain a roasting raw material;
(2) Feeding the roasting raw material in the step (1) into a rotary kiln for roasting for 30min, wherein the roasting temperature is 680 ℃, and then cooling to room temperature;
(3) Crushing magnesite after calcining in the step (2), and grading by a double-layer vibration sieve to obtain a raw material of-6 mm, a raw material of 6-12 mm and a raw material of 12-20 mm;
(4) Sending the raw material with the thickness of-6 mm into a re-vibrating jigger for re-selecting, wherein the concentration of ore pulp is 30%, and obtaining a light product with the thickness of-6 mm and a heavy product with the thickness of-6 mm;
(5) The method comprises the steps of (1) conveying raw materials with the thickness of 6-12 mm into a wind power shaking table for reselection and sorting to obtain light products with the thickness of 6-12 mm and heavy products with the thickness of 6-12 mm;
(6) The method comprises the steps of (1) sending 12-20 mm raw materials into a diaphragm jigger for reselection and sorting, wherein the concentration of ore pulp is 30%, and a 12-20 mm light product and a 12-20 mm heavy product are obtained;
(7) Feeding the light products with the thickness of between 4 and 6mm in the step (4) into a high-gradient magnetic separator for magnetic separation, wherein the magnetic field strength is 1.2T, and obtaining magnetic concentrate with the thickness of between 6mm and magnetic tailings with the thickness of between 6mm and 6 mm;
(8) Feeding the light products with the thickness of 6-12 mm in the step (5) into a dry magnetic separator for magnetic separation, wherein the magnetic field strength is 0.8T, and 6-12 mm magnetic concentrate and 6-12 mm magnetic tailings are obtained;
(9) Filtering and drying the tailings subjected to magnetic separation in the steps (7) -6mm and the light products subjected to the steps (6) and 12-20 mm, wherein the moisture is less than 5%, and then uniformly mixing the tailings subjected to magnetic separation in the steps (8) and 6-12 mm to obtain a mixture;
(10) And (3) feeding the mixture obtained in the step (9) into a rotary kiln for calcination for 1h, wherein the calcination temperature is 850 ℃, and then cooling to room temperature to obtain a magnesium oxide product.
The light burned magnesia prepared in this example has 98.63% magnesia content, 0.27% CaO content, 0.26% SiO 2 content and 0.25% TFe content.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (1)
1. A method for preparing magnesium oxide from low-grade magnesite comprises the following steps:
(1) Crushing and screening magnesite to obtain a roasting raw material, wherein the magnesia content of the magnesite is 41.08%, and the granularity of the roasting raw material is less than 20mm;
(2) Feeding the roasting raw material obtained in the step (1) into a rotary kiln for roasting for 30-40 min, and then cooling to room temperature, wherein the roasting temperature is 580-680 ℃;
(3) Crushing magnesite after calcining in the step (2), and grading by a double-layer vibration sieve to obtain a raw material of-6 mm, a raw material of 6-12 mm and a raw material of 12-20 mm;
(4) Sending the raw material with the diameter of-6 mm into a jigger for reselection and sorting to obtain a light product with the diameter of-6 mm and a heavy product with the diameter of-6 mm, wherein the jigger is a double-vibration jigger, and the concentration of ore pulp of the jigger is 20% -25%;
(5) The method comprises the steps of (1) conveying raw materials with the thickness of 6-12 mm into a shaking table for reselection and sorting to obtain light products with the thickness of 6-12 mm and heavy products with the thickness of 6-12 mm, wherein the shaking table is a wind shaking table;
(6) The method comprises the steps of (1) sending 12-20 mm raw materials into a jigger for reselection and sorting to obtain 12-20 mm light products and 12-20 mm heavy products, wherein the jigger is a diaphragm jigger, and the concentration of ore pulp of the jigger is 20% -25%;
(7) Feeding the light products with the thickness of between 4 and 6mm into a magnetic separator for magnetic separation to obtain magnetic concentrate with the thickness of between 6 and 6mm and magnetic tailings with the thickness of between 6 and 6mm, wherein the magnetic separator is a high-gradient magnetic separator, and the magnetic field strength is 1.2T-1.5T;
(8) Feeding the light products with the diameter of 6-12 mm in the step (5) into a magnetic separator for magnetic separation to obtain magnetic concentrate with the diameter of 6-12 mm and magnetic tailings with the diameter of 6-12 mm;
(9) Filtering and drying the tailings subjected to magnetic separation in the steps (7) -6mm and the light products subjected to the steps (6) and 12-20 mm, wherein the moisture is less than 5%, and then uniformly mixing the tailings subjected to magnetic separation in the steps (8) and 6-12 mm to obtain a mixture;
(10) And (3) feeding the mixture obtained in the step (9) into a rotary kiln to calcine for 1-2 h, and then cooling to room temperature to obtain a magnesium oxide product, wherein the calcination temperature is 750-850 ℃.
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| CN110498621B (en) * | 2019-09-02 | 2021-11-05 | 于景坤 | Preparation method of superfine purified concentrate powder sintered magnesia |
| CN112320826A (en) * | 2020-10-29 | 2021-02-05 | 刘峰 | Method for jointly preparing high-purity magnesium oxide and refined ammonium sulfate by using low-grade magnesite |
| CN115572080B (en) * | 2022-11-09 | 2024-01-16 | 营口菱镁化工集团有限公司 | Preparation method of feed-grade magnesium oxide |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB380868A (en) * | 1931-06-06 | 1932-09-29 | Octave Tagnon | Improvements in and relating to the decomposition of magnesium carbonate-containing ores |
| RU2595120C1 (en) * | 2015-06-17 | 2016-08-20 | Общество С Ограниченной Ответственностью "Группа "Магнезит" | Method of thermomechanical enrichment of magnesite in indirect heating furnaces |
-
2019
- 2019-04-16 CN CN201910302189.2A patent/CN110002772B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB380868A (en) * | 1931-06-06 | 1932-09-29 | Octave Tagnon | Improvements in and relating to the decomposition of magnesium carbonate-containing ores |
| RU2595120C1 (en) * | 2015-06-17 | 2016-08-20 | Общество С Ограниченной Ответственностью "Группа "Магнезит" | Method of thermomechanical enrichment of magnesite in indirect heating furnaces |
Non-Patent Citations (1)
| Title |
|---|
| 菱镁矿阶梯化煅烧制备活性氧化镁;邓玉芬等;非金属矿;第40卷(第1期);第16-18页 * |
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