CN111792658A - Production method of high-purity magnesia - Google Patents
Production method of high-purity magnesia Download PDFInfo
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- CN111792658A CN111792658A CN202010542188.8A CN202010542188A CN111792658A CN 111792658 A CN111792658 A CN 111792658A CN 202010542188 A CN202010542188 A CN 202010542188A CN 111792658 A CN111792658 A CN 111792658A
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- magnesite
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/02—Magnesia
- C01F5/06—Magnesia by thermal decomposition of magnesium compounds
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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Abstract
A process for preparing high-purity magnesite features that under the condition of limited mining of high-quality magnesite ore, the floated magnesite powder and the by-product of large crystal are reused to obtain high-purity magnesite, and the by-product of large crystal is 10-200mm in granularity. The physicochemical indexes of the large crystal auxiliary material are that the ignition loss is less than or equal to 0.15wt percent, and the MgO is more than or equal to 92.0wt percent. The magnesite flotation powder and the large crystal auxiliary material powder are prepared from the following components in percentage by mass: magnesite flotation powder 0-100%, and large crystal auxiliary material powder 0-100%. The method saves mineral resources, increases the yield of high-purity magnesite, and solves the problem that the auxiliary material of large-crystal products is difficult to treat.
Description
Technical Field
The invention relates to the technical field of primary processing and smelting of a magnesium ore refractory material, in particular to a production method of high-purity magnesia.
Background
The high-purity magnesite is generally prepared by high-temperature calcination of magnesite, brucite or magnesium hydroxide prepared by reaction of seawater and lime cream, and the MgO content of the magnesite is more than 98%.
China is one of the countries in the world where magnesite resources are rich, the magnesite resource reserves of Liaoning province account for 80% of the total reserves in the country, and the resource buried layer is shallow and easy to mine. At present, high-quality magnesite becomes one of main raw materials for preparing high-purity magnesite. However, during the primary selection of magnesite, a large amount of byproduct magnesite flotation powder is generated, the flotation powder is not easy to sinter due to low grade and is powdery, the flotation powder is discarded in the early stage, and part of fused magnesia manufacturers are used as auxiliary raw materials for preparing low-grade fused magnesia in the later stage. The part of mineral products can not be used for producing high-purity magnesite, and the mining of magnesite is a great waste.
In addition, each fused mound in the production process of the large crystals has about 20 percent of auxiliary products besides the finished product and the large crystal sand, the yield value of the auxiliary materials is extremely low due to low bulk density, and if the melting sintering is continued, the quality of the finished product of the large crystals is influenced due to overhigh impurities. Therefore, the treatment of the side product of the large crystal product is also a problem which is difficult to solve by manufacturers.
Disclosure of Invention
The invention aims to provide a method and a device for producing high-purity magnesite, which utilize magnesite flotation powder and large-crystal product auxiliary materials to reuse under the condition of limited exploitation of high-quality magnesite raw materials, produce high-purity magnesite, save mineral resources, increase the yield of high-purity magnesite, and solve the problem that the large-crystal product auxiliary materials are difficult to treat.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production method of high-purity magnesite is processed by magnesite flotation powder and/or large crystal auxiliary materials, and the specific method comprises the following steps:
1) crushing and grinding the large crystal auxiliary material by using a ball mill until the granularity is 200 meshes;
2) flotation powder of magnesite, large-crystal auxiliary material powder obtained in the step 1) and water are mixed according to the weight ratio of 1: 6 to 8 mass ratio, and introducing CO2Stirring for more than 30 minutes;
3) standing for precipitation, separating solid from liquid, heating and distilling the separated water solution to generate magnesium carbonate crystals;
4) and (2) crushing the magnesium carbonate after crystallization and sintering to obtain light magnesium oxide powder, pressing the light magnesium oxide powder into balls by using a ball press machine, curing and drying after the ball pressing is finished, then putting the dried magnesium balls into a kiln, calcining in a vertical kiln, cooling to 150-plus-material temperature of 200 ℃ by using a cooling zone, and discharging from the kiln by using a discharging machine to obtain the high-purity magnesia.
The large-crystal auxiliary material is a product auxiliary material for producing large-crystal fused magnesium, and the granularity is 10-200 mm.
The physicochemical indexes of the large crystal auxiliary material are that the ignition loss is less than or equal to 0.15wt percent, and the MgO is more than or equal to 92.0wt percent.
The magnesite flotation powder and the large crystal auxiliary material powder are prepared from the following components in percentage by mass: magnesite flotation powder 0-100%, and large crystal auxiliary material powder 0-100%.
The heating distillation in the step 3) is 95-110 ℃.
The sintering temperature of the magnesium carbonate crystallization in the step 4) is 750-800 ℃, and the calcining temperature in the shaft kiln is 1950-2050 ℃.
Compared with the prior art, the invention has the beneficial effects that:
a method and a device for producing high-purity magnesite are disclosed, which utilize magnesite flotation powder and large crystal product auxiliary materials to be reused under the condition of limited mining of high-quality magnesite raw materials, thereby producing high-purity magnesite, saving mineral resources, increasing the yield of high-purity magnesite, and solving the problem that the large crystal product auxiliary materials are difficult to process.
Drawings
FIG. 1 is a schematic view of a production apparatus of the present invention.
In the figure: 1-stirring paddle, 2-motor, 3-C2An O gas inlet pipe, 4-gear transmission, 5-a digestion tank, 6-impurity solid precipitate, 7-a distillation still, 8-a crusher, 9-a ball press, 10-a shaft kiln, 11-a rotary joint, 12-a liquid discharge port and 13-a solid discharge port.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
a production method of high-purity magnesite is processed by magnesite flotation powder and/or large crystal auxiliary materials, and the specific method comprises the following steps:
1) crushing and grinding the large crystal auxiliary material by using a ball mill until the granularity is 200 meshes;
2) flotation powder of magnesite, large-crystal auxiliary material powder obtained in the step 1) and water are mixed according to the weight ratio of 1: 6 to 8 mass ratio, and introducing CO2Stirring for more than 30 minutes; in the process, MgO, water and CO in the flotation powder and the large crystal auxiliary material powder2Reacting to generate basic magnesium carbonate (MgHCO)3) Dissolved in water.
3) Standing for precipitation, separating solid and liquid, and collecting the separated water solution (MgHCO)3Aqueous solution) is heated and distilled to generate magnesium carbonate crystals;
4) and (2) crushing the magnesium carbonate after crystallization and sintering to obtain light magnesium oxide powder, pressing the light magnesium oxide powder into balls by using a ball press machine, curing and drying after the ball pressing is finished, then putting the dried magnesium balls into a kiln, calcining in a vertical kiln, cooling to 150-plus-material temperature of 200 ℃ by using a cooling zone, and discharging from the kiln by using a discharging machine to obtain the high-purity magnesia.
The large-crystal auxiliary material is a product auxiliary material for producing large-crystal fused magnesium, and the granularity is 10-200 mm.
The physicochemical indexes of the large crystal auxiliary material are that the ignition loss is less than or equal to 0.15wt percent, and the MgO is more than or equal to 92.0wt percent.
The magnesite flotation powder and the large crystal auxiliary material powder are prepared from the following components in percentage by mass: magnesite flotation powder 0-100%, and large crystal auxiliary material powder 0-100%.
The heating distillation in the step 3) is 95-110 ℃.
The sintering temperature of the magnesium carbonate crystallization in the step 4) is 750-800 ℃, and the calcining temperature in the shaft kiln is 1950-2050 ℃.
As shown in figure 1, the device adopted by the production method of the high-purity magnesite comprises a digestion tank 5, a distillation still 7, a crusher 8, a ball press machine 9 and a shaft kiln 10, wherein the digestion tank 5 comprises a tank body, a stirring paddle 1, a rotary joint 11, CO2Intake pipe 3, motor 2, stirring rake 1 sets up in the jar body, motor 2 passes through gear drive 4 and connects stirring rake 1, stirring rake 1 is hollow structure, and there is the venthole bottom, and the upper end is through rotatory switchingHead 3 to CO2The gas inlet pipe 3 is provided with a liquid outlet 12 at the middle lower part of the tank body, and a solid discharge port 13 at the bottommost part of the tank body; the liquid outlet 12 of the tank body is connected with a distillation kettle 7 through a pipeline, the distillation kettle 7 feeds materials to a crusher 8, the crusher 8 feeds materials to a ball press machine 9, and the ball press machine 9 feeds materials to a shaft kiln 10.
The device of the invention is to put magnesite flotation powder, large crystal auxiliary material powder and water into a digestion tank 5, and CO is added by a stirring paddle 12Introducing the mixture into the tank body for stirring, wherein the mode can ensure that the materials in the tank body are mixed with water and CO2The full contact makes the reaction more thorough, and is beneficial to the purification of MgO in magnesite flotation powder and large crystal auxiliary material powder materials.
The material in the digestion tank 5 is stirred for reaction, then is kept stand, and MgHCO at the upper layer is discharged through a liquid outlet 123The aqueous solution is separated from the lower impurity solid precipitate 6, and the impurity solid precipitate 6 is discharged through a solid discharge port 13 at the bottom of the tank. Valves are arranged at the liquid outlet 12 and the solid discharge port 13.
The shaft kiln 10 of the present invention is fired using a high temperature oil shaft kiln.
The physicochemical indexes of the high-purity fused magnesia produced by the invention are as follows: the ignition loss is less than or equal to 0.15 wt%, the MgO is more than or equal to 98 wt%, and the volume density is more than or equal to 3.45g/cm3。
Claims (6)
1. The production method of high-purity magnesite is characterized by utilizing magnesite flotation powder and/or large crystal auxiliary materials to process, and the specific method comprises the following steps:
1) crushing and grinding the large crystal auxiliary material by using a ball mill until the granularity is 200 meshes;
2) flotation powder of magnesite, large-crystal auxiliary material powder obtained in the step 1) and water are mixed according to the weight ratio of 1: 6 to 8 mass ratio, and introducing CO2Stirring for more than 30 minutes;
3) standing for precipitation, separating solid from liquid, heating and distilling the separated water solution to generate magnesium carbonate crystals;
4) and (2) crushing the magnesium carbonate after crystallization and sintering to obtain light magnesium oxide powder, pressing the light magnesium oxide powder into balls by using a ball press machine, curing and drying after the ball pressing is finished, then putting the dried magnesium balls into a kiln, calcining in a vertical kiln, cooling to 150-plus-material temperature of 200 ℃ by using a cooling zone, and discharging from the kiln by using a discharging machine to obtain the high-purity magnesia.
2. The method for producing high purity magnesite according to claim 1, wherein the secondary material of macrocrystals is a secondary material of a product for producing macrocrystalline fused magnesia, and the particle size is 10-200 mm.
3. The method for producing high-purity magnesite clinker as claimed in claim 2, wherein the physicochemical indexes of the large crystal auxiliary material are that the ignition loss is less than or equal to 0.15 wt%, and the MgO is more than or equal to 92.0 wt%.
4. The production method of high-purity magnesite according to claim 1, wherein the mass ratio of the magnesite flotation powder to the large crystal auxiliary material powder is as follows: magnesite flotation powder 0-100%, and large crystal auxiliary material powder 0-100%.
5. The method for producing high purity magnesite according to claim 1, wherein the temperature of the heated distillation in the step 3) is 95-110 ℃.
6. The method as claimed in claim 1, wherein the sintering temperature of the magnesium carbonate crystals in the step 4) is 750-800 ℃ and the calcination temperature in the shaft kiln is 1950-2050 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115353300A (en) * | 2022-09-29 | 2022-11-18 | 信德(深圳)城市建筑环保科技有限公司 | Method for preparing high-activity magnesium oxide based on low-grade magnesite |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3976251A (en) * | 1973-12-19 | 1976-08-24 | Financial Mining - Industrial And Shipping Corporation | Separation of magnesite from its contaminants by reverse flotation |
| CN1408666A (en) * | 2001-09-29 | 2003-04-09 | 沈阳市苏家屯区胜利砂轮厂 | process for producing magnesium oxide from waste magnesite ore |
| CN107298451A (en) * | 2017-06-12 | 2017-10-27 | 沈阳化工大学 | A kind of double Application ways of low-grade magnesite magnesium carbon |
| CN107311207A (en) * | 2017-06-12 | 2017-11-03 | 沈阳化工大学 | A kind of low-grade magnesite and boron magnesium ore method of comprehensive utilization |
| CN207713258U (en) * | 2018-01-10 | 2018-08-10 | 海城镁矿耐火材料总厂 | A kind of highly-purity magnesite hoisting transportation device |
| CN207716871U (en) * | 2018-01-10 | 2018-08-10 | 海城镁矿耐火材料总厂 | A kind of electric melting magnesium furnace uniform distribution device |
| CN110395917A (en) * | 2019-07-26 | 2019-11-01 | 鞍山盈丰新材料科技有限公司 | A kind of high-purity electrosmelted magnesite clinker and method using the production of magnesia substandard goods |
-
2020
- 2020-06-15 CN CN202010542188.8A patent/CN111792658B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3976251A (en) * | 1973-12-19 | 1976-08-24 | Financial Mining - Industrial And Shipping Corporation | Separation of magnesite from its contaminants by reverse flotation |
| CN1408666A (en) * | 2001-09-29 | 2003-04-09 | 沈阳市苏家屯区胜利砂轮厂 | process for producing magnesium oxide from waste magnesite ore |
| CN107298451A (en) * | 2017-06-12 | 2017-10-27 | 沈阳化工大学 | A kind of double Application ways of low-grade magnesite magnesium carbon |
| CN107311207A (en) * | 2017-06-12 | 2017-11-03 | 沈阳化工大学 | A kind of low-grade magnesite and boron magnesium ore method of comprehensive utilization |
| CN207713258U (en) * | 2018-01-10 | 2018-08-10 | 海城镁矿耐火材料总厂 | A kind of highly-purity magnesite hoisting transportation device |
| CN207716871U (en) * | 2018-01-10 | 2018-08-10 | 海城镁矿耐火材料总厂 | A kind of electric melting magnesium furnace uniform distribution device |
| CN110395917A (en) * | 2019-07-26 | 2019-11-01 | 鞍山盈丰新材料科技有限公司 | A kind of high-purity electrosmelted magnesite clinker and method using the production of magnesia substandard goods |
Non-Patent Citations (1)
| Title |
|---|
| 陈昌林等: "高纯镁砂制备生产工艺", 《耐火与石灰》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115353300A (en) * | 2022-09-29 | 2022-11-18 | 信德(深圳)城市建筑环保科技有限公司 | Method for preparing high-activity magnesium oxide based on low-grade magnesite |
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| CN111792658B (en) | 2022-10-11 |
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