CN1172768A - Method for producing electric smelting high-purity magnesite suitable for plateau environment - Google Patents
Method for producing electric smelting high-purity magnesite suitable for plateau environment Download PDFInfo
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- CN1172768A CN1172768A CN 97115279 CN97115279A CN1172768A CN 1172768 A CN1172768 A CN 1172768A CN 97115279 CN97115279 CN 97115279 CN 97115279 A CN97115279 A CN 97115279A CN 1172768 A CN1172768 A CN 1172768A
- Authority
- CN
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- Prior art keywords
- precipitate
- purity magnesite
- value
- magnesium
- solution
- Prior art date
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- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 title claims abstract description 18
- 239000001095 magnesium carbonate Substances 0.000 title claims abstract description 18
- 235000014380 magnesium carbonate Nutrition 0.000 title claims abstract description 18
- 229910000021 magnesium carbonate Inorganic materials 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000003723 Smelting Methods 0.000 title claims abstract description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 24
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 22
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 13
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 11
- 238000001354 calcination Methods 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000002244 precipitate Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 16
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 14
- 239000000395 magnesium oxide Substances 0.000 claims description 12
- 229960002337 magnesium chloride Drugs 0.000 claims description 10
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000000047 product Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 230000002140 halogenating effect Effects 0.000 claims description 3
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 claims description 3
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 239000002585 base Substances 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 239000012670 alkaline solution Substances 0.000 claims 1
- 239000008188 pellet Substances 0.000 claims 1
- 239000013049 sediment Substances 0.000 abstract 2
- 239000013078 crystal Substances 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 241001131796 Botaurus stellaris Species 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 235000011116 calcium hydroxide Nutrition 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- ZEMPKEQAKRGZGQ-AAKVHIHISA-N 2,3-bis[[(z)-12-hydroxyoctadec-9-enoyl]oxy]propyl (z)-12-hydroxyoctadec-9-enoate Chemical compound CCCCCCC(O)C\C=C/CCCCCCCC(=O)OCC(OC(=O)CCCCCCC\C=C/CC(O)CCCCCC)COC(=O)CCCCCCC\C=C/CC(O)CCCCCC ZEMPKEQAKRGZGQ-AAKVHIHISA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 241001122767 Theaceae Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000008234 soft water Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a method for producing electric smelting high-purity magnesite suitable for plateau environment, in particular to a method for producing electric smelting high-purity magnesite by reacting magnesium chloride with sodium carbonate to generate sediment and calcining sediment magnesium carbonate. The invention is easy to master, has low investment and high efficiency, and is particularly suitable for production in plateau environment.
Description
The invention relates to a preparation method of an oxide, in particular to a novel process for producing electric melting high-purity magnesite suitable for a plateau environment.
The most common method for producing high purity magnesite at present is limestone method, such as that used in high purity magnesite factory of gelmu, Qinghai province, which mainly comprises calcining limestone (cushion stone) with calcium content of more than 45% to obtain hydrated lime calcium oxide (CaO) with activity of 465, reacting calcium oxide with water to prepare calcium hydroxide emulsion, and reacting the calcium hydroxide emulsion with magnesium oxide solution to generate magnesium hydroxide precipitate which is insoluble in water. Filtering, roasting and electrically melting the precipitate to prepare crystal magnesia, namely high-purity magnesite. The main reaction equation is as follows: however, this method has the following drawbacks:
1. the limestone contains many impurity elements, such as Fe3+、Al3+、Sio2And the like, so that the purity of the prepared magnesia is not high.
2. The calcining difficulty is high. In particular, in some plateau areas, the reasons of high altitude, low atmospheric pressure, low air temperature, oxygen deficiency and the like have great influence on the calcined lime dust CaO with the calcination activity of about 465, for example, the structure of a lime kiln can not use a coal kiln, and a rail type loading box body needs to use heavy oil as fuel. The kiln wall of the kiln is affected by high-grade low-temperature low pressure, so that accidents are caused, the kiln wall is burst, rails are deformed, and a box body is melted. And the calcined lime CaO has low external slaking and internal generating use value.
3. The method has the advantages of large consumption of people, materials and materials, more production links, large amount of occupied funds, unobvious effect and large actual operation difficulty.
The invention aims to overcome the defects of the method and provide a novel method for producing high-purity magnesite, which is easy to master, low in investment, high in efficiency and particularly suitable for plateau environments.
The invention relates to a method for producing electric smelting high-purity magnesite clinker suitable for plateau environment, which comprises the following process steps:
(1) halogenating: dissolving magnesium chloride hexahydrate in a strong base solution with the pH value of 8.5-10, and removing precipitate to obtain a clear magnesium chloride aqueous solution;
(2) alkali dissolution: adding sodium carbonate powder into warm water at 70-90 ℃, and stirring until the sodium carbonate powder is completely dissolved;
(3) mixing: mixing the two solutions in a molar ratio of 1: 1 in a reaction tank, and stirring, wherein the pH value is 10-12 during reaction to obtain a magnesium carbonate precipitate;
(4) and (3) dehydrating: filtering and washing the precipitate prepared in the step (2), and roasting at the temperature of 300-500 ℃ for 2-3 hours;
(5) electric melting: and (3) placing the dehydrated precipitation product in an electric melting furnace, calcining for 2-3 hours at 2800-3600 ℃ to obtain high-purity magnesium oxide, cooling, and crushing to obtain the high-purity magnesite.
The magnesium oxide produced by the method has the following general chemical formula:
1. easy operation, work efficiency are high: the method can save a large amount of manpower, can be normally carried out by reducing 15 people per shift to 3-4 people in the past, has the working efficiency of more than 2 times of the original working efficiency, is not limited by conditions such as plateau climate and the like, has low technical degree, can be mastered by common workers through simple learning and operation, and can stably and normally produce.
2. The production link is less, and the occupied capital is small. It is made from local materials, Na2Co3The method is characterized in that the finished product can be directly produced only by feeding raw materials back from a manufacturer (alkali factories exist in the Dengha city which is two hundred kilometers away from the grid city and belongs to one area), and only the occupied funds are the occupied funds.
3. Low production cost and low investment.
The production cost per ton of magnesium oxide produced is compared with the prior art as shown in Table 1.
TABLE 1 comparison of production costs
| Prior Art | The invention | |
| Original source Material Become into Book (I) | 1.4 ton calcium oxide 980 yuan Heavy oil 4.2 ton 2604 yuan | 2.65 ton sodium carbonate 3380 |
| Total up to | 3584 yuan | 3380 Yuan tea |
The magnesium oxide produced by the method has the technical indexes that: the purity is more than 98 percent, the content of calcium ions is less than 1 percent, and other transitional elements are less than 1 percent.
The present invention will be described in detail with reference to examples.
The raw material sodium carbonate used in the invention is produced by alkali factory of Dereama, and the magnesium oxide crystal is MgCl in Guermu area2·6H2Natural crystal O, sodium hydroxide as a commercial product, and water as calcium-removing soft water; the main equipment used in the invention is a reaction tank, a ball press, a kiln, an electric melting furnace, filtering equipment and the like, and the equipment is conventional equipment.
The bittern pool used in the invention is maintained in the open, a rectangular groove pool with the depth of 1.5 meters, the length of 6 meters and the width of 3 meters is dug downwards from the ground, a small groove is reserved at the bottom, the width and the depth of the groove are 30 centimeters multiplied by 10 centimeters, the whole bittern pool is built by bricks and cement, and the outside of the bittern pool is coated with anticorrosive paint.
The alkali dissolving container is a container which is welded by a steel plate and has a conical bottom and a cylinder more than 40 cm, a movable steel wire mesh is arranged at the position of 20 cm of the bottom, and the interior of the container is coated with anti-rust paint and then coated with anti-corrosion paint. A drain valve is provided at the bottom and the container size is dependent on the throughput.
Example 1:
(1) dissolving 21 g of sodium hydroxide in 40-degree (DEG C) water, and adjusting the pH value of the sodium hydroxide solution to 9.5;
(2) weighing 65 g of magnesium chloride hexahydrate crystals, slowly adding a sodium hydroxide solution with the pH value of 9.5, and stirring to completely dissolve magnesium chloride, wherein the pH value of the solution is measured to be 7;
(3) standing the solution obtained in the step (2) for half an hour, and filtering to obtain yellow impurities as the filter residue, wherein the impurities are Fe3+、Al3+、Pb2+、Zn2+And (4) hydroxide is added, and the filtrate is the obtained magnesium chloride solution.
(4) Dissolving 34 g of sodium carbonate in 68 ml of 70-90-degree water to prepare a sodium carbonate solution, slowly pouring the solution into 32 ml of magnesium chloride solution under a stirring state, generating white precipitate, and measuring the pH value of the solution to be 11.3;
(5) standing the precipitate for 20-30 min, filtering the precipitate, and washing with water;
(6) the water-washed precipitate is micro-dried in a kiln at 300 ℃ for 2 hours to remove moisture;
(7) and (3) calcining the micro-dried magnesium carbonate in an electric melting furnace at 2800 ℃ for 3 hours, wherein the working voltage of the electric melting furnace is 80V, the current is 5000 amperes, and cooling to obtain 12 grams of white magnesium oxide products.
Example 2:
the specific operation steps are the same as those of the embodiment 1, and the selected parameter change is as follows: the magnesium chloride crystal is dissolved by potassium hydroxide solution, the pH value is 10, the weight of the used magnesium chloride crystal is 5000 kg, the weight of sodium carbonate is 2650 kg, the pH value of thesolution is 12 after the magnesium chloride is precipitated by the sodium carbonate solution, the precipitate can be micro-dried in a kiln at 500 ℃ for 2 hours, and then calcined in an electric melting furnace at 3600 ℃ for 2 hours, so that 837 kg of magnesium oxide can be obtained.
Example 3:
the procedure of example 1 was repeated, and after washing the precipitate with filtered water, the precipitate was pressed into a spherical or round shape by a press and then sent to a kiln for micro-firing. The addition of this step can reduce the loss of the precipitate in the micro-firing and calcination, and improve the yield. 895 kg of magnesium oxide were obtained in this way using the parameters of example 2.
Example 4:
the operating procedure of example 1 was followed with the following parameters: the PH value of a sodium hydroxide solution for dissolving magnesium chloride crystals is 8.5, the PH value of the solution after magnesium chloride is precipitated by a sodium carbonate solution is 9, the precipitate is pressed into balls, and then is micro-dried in a kiln at 400 ℃ for 3 hours and then is calcined in an electric smelting furnace at 3200 ℃ for 3 hours.
Claims (5)
1. A method for producing electric smelting high-purity magnesite clinker suitable for plateau environment comprises the following process steps:
(1) halogenating: dissolving magnesium chloride hexahydrate in a strong base solution with the pH value of 8.5-10, and removing precipitate to obtain a clear magnesium chloride aqueous solution;
(2) alkali dissolution: adding sodium carbonate powder into warm water at 70-90 ℃, and stirring until the sodium carbonate powder is completely dissolved;
(3) mixing: mixing the two solutions in a molar ratio of 1: 1 in a reaction tank, and stirring, wherein the pH value is 10-12 during reaction to obtain a magnesium carbonate precipitate;
(4) and (3) dehydrating: filtering and washing the precipitate prepared in the step (2), and roasting at the temperature of 300-500 ℃ for 2-3 hours;
(5) electric melting: and (3) placing the dehydrated precipitation product in an electric melting furnace, calcining for 2-3 hours at 2800-3600 ℃ to obtain high-purity magnesium oxide, cooling, and crushing to obtain the high-purity magnesite.
2. The method according to claim 1, characterized in that the strong alkaline solution is a sodium hydroxide solution.
3. The method of claim 1, wherein the pH is controlled to be 9.5 during the halogenating step.
4. The method according to claim 1, wherein the pH value controlled in the step of dissolving the alkali is preferably 11.3.
5. A process according to any one of claims 1 to 4, characterised in that the magnesium carbonate precipitate is extruded into round or egg-shaped pellets in a ball press before being dewatered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97115279A CN1052456C (en) | 1997-08-29 | 1997-08-29 | Method for producing electric smelting high-purity magnesite suitable for plateau environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97115279A CN1052456C (en) | 1997-08-29 | 1997-08-29 | Method for producing electric smelting high-purity magnesite suitable for plateau environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1172768A true CN1172768A (en) | 1998-02-11 |
| CN1052456C CN1052456C (en) | 2000-05-17 |
Family
ID=5173266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97115279A Expired - Fee Related CN1052456C (en) | 1997-08-29 | 1997-08-29 | Method for producing electric smelting high-purity magnesite suitable for plateau environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1052456C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069613C (en) * | 1998-02-05 | 2001-08-15 | 吕洪凤 | Process for continuously smelting electrofused magnesia |
| CN107585779A (en) * | 2017-10-13 | 2018-01-16 | 中南大学 | A kind of preparation method containing chrome-magnesite |
| CN108706966A (en) * | 2018-08-22 | 2018-10-26 | 连云港市隆泰镁业有限公司 | A kind of preparation method and application of high-purity electrically molten magnesia |
| CN109019644A (en) * | 2018-08-20 | 2018-12-18 | 镇江裕太防爆电加热器有限公司 | A kind of magnesium tube material production equipment for high temperature heater (HTH) |
| CN109133121A (en) * | 2018-08-20 | 2019-01-04 | 镇江裕太防爆电加热器有限公司 | A kind of magnesium tube material production method for high temperature heater (HTH) |
| CN109790043A (en) * | 2016-09-12 | 2019-05-21 | 丹石产业株式会社 | Synthesize hydromagnesite particle and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU718373A1 (en) * | 1977-05-11 | 1980-02-29 | Предприятие П/Я В-8046 | Method of preparing magnesium oxide |
| JPS6311516A (en) * | 1986-07-02 | 1988-01-19 | Natl Inst For Res In Inorg Mater | Production of high purity magnesia powder having anti-hydration property |
-
1997
- 1997-08-29 CN CN97115279A patent/CN1052456C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069613C (en) * | 1998-02-05 | 2001-08-15 | 吕洪凤 | Process for continuously smelting electrofused magnesia |
| CN109790043A (en) * | 2016-09-12 | 2019-05-21 | 丹石产业株式会社 | Synthesize hydromagnesite particle and preparation method thereof |
| CN107585779A (en) * | 2017-10-13 | 2018-01-16 | 中南大学 | A kind of preparation method containing chrome-magnesite |
| CN107585779B (en) * | 2017-10-13 | 2019-10-22 | 中南大学 | A kind of preparation method containing chrome-magnesite |
| CN109019644A (en) * | 2018-08-20 | 2018-12-18 | 镇江裕太防爆电加热器有限公司 | A kind of magnesium tube material production equipment for high temperature heater (HTH) |
| CN109133121A (en) * | 2018-08-20 | 2019-01-04 | 镇江裕太防爆电加热器有限公司 | A kind of magnesium tube material production method for high temperature heater (HTH) |
| CN108706966A (en) * | 2018-08-22 | 2018-10-26 | 连云港市隆泰镁业有限公司 | A kind of preparation method and application of high-purity electrically molten magnesia |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1052456C (en) | 2000-05-17 |
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