CN1114289A - Chemical process for producing magnesium sand - Google Patents
Chemical process for producing magnesium sand Download PDFInfo
- Publication number
- CN1114289A CN1114289A CN 95110422 CN95110422A CN1114289A CN 1114289 A CN1114289 A CN 1114289A CN 95110422 CN95110422 CN 95110422 CN 95110422 A CN95110422 A CN 95110422A CN 1114289 A CN1114289 A CN 1114289A
- Authority
- CN
- China
- Prior art keywords
- magnesium
- solution
- magnesium nitrate
- nitrate
- sand
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 9
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 9
- 239000011777 magnesium Substances 0.000 title claims abstract description 9
- 239000004576 sand Substances 0.000 title claims abstract 7
- 238000001311 chemical methods and process Methods 0.000 title claims 2
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000000243 solution Substances 0.000 claims abstract description 27
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 13
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 13
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 13
- QWDJLDTYWNBUKE-UHFFFAOYSA-L magnesium bicarbonate Chemical compound [Mg+2].OC([O-])=O.OC([O-])=O QWDJLDTYWNBUKE-UHFFFAOYSA-L 0.000 claims abstract description 9
- 229910000022 magnesium bicarbonate Inorganic materials 0.000 claims abstract description 9
- 239000002370 magnesium bicarbonate Substances 0.000 claims abstract description 9
- 235000014824 magnesium bicarbonate Nutrition 0.000 claims abstract description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000012267 brine Substances 0.000 claims abstract description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 8
- 239000013535 sea water Substances 0.000 claims abstract description 8
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 6
- 239000004571 lime Substances 0.000 claims abstract description 6
- 239000007787 solid Substances 0.000 claims abstract description 6
- 238000001704 evaporation Methods 0.000 claims abstract description 3
- 239000001095 magnesium carbonate Substances 0.000 claims description 14
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 14
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 14
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000002244 precipitate Substances 0.000 claims description 3
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 2
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 2
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 2
- 239000001099 ammonium carbonate Substances 0.000 claims description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- 239000006104 solid solution Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 20
- 239000000395 magnesium oxide Substances 0.000 description 13
- 238000005285 chemical preparation method Methods 0.000 description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical group [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The process for preparing magnesium sand chemically includes such technological steps as adding lime in sea water or brine to obtain solution of magnesium hydroxide, addition of nitric acid to obtain solution of magnesium nitrate, adding magnesium hydrogen carbonate for purifying, evaporating to obtain solid magnesium nitrate and heat-decomposing to obtain magnesium sand.
Description
The present invention relates to a chemical preparation method of magnesite, particularly to a method for preparing magnesite from seawater or brine after sun salt is dried.
The chemical name of magnesite is magnesium oxide (MgO), which is an important refractory material, and the method for preparing magnesite in the prior art is to calcine magnesite (MgCO) at high temperature3) Decomposing the mixture at a high temperature to obtain magnesium oxide (MgO) and magnesium prismatic ore (MgCO)3) The decomposition temperature of the magnesia reaches 2600 ℃, the magnesia prepared by the method has the defects of unstable quality, low purity which can only reach 98 percent at most, and the magnesia can only be supplied to the common refractory industry and can not be used for manufacturing special refractory materials, for example, the magnesia used for the refractory material of a high-temperature electric heating tube generally requires more than 99 percent of purity. On the other hand, the defects of complex process, large energy consumption, high production cost, environmental pollution caused by a large amount of smoke generated by the magnesium prismatic ores during pyrolysis and the like exist.
The invention aims to provide a chemical preparation method of magnesia, which has simple process, low production cost and no environmental pollution;
the chemical preparation method of magnesite includes the steps of preparing magnesium hydroxide, preparing magnesium nitrate, purifying magnesium nitrate and preparing magnesite, and is characterized by that the preparation step of magnesite includes the steps of adding lime into sea water or brine after sun salt treatment to obtain magnesium hydroxide solution, then adding nitric acid into magnesium hydroxide solution to obtain magnesium nitrate solution, then adding magnesium hydrogen carbonate into magnesium nitrate solution to purify magnesium nitrate solution, then evaporating water from purified magnesium nitrate solution to obtain magnesium nitrate solid, finally heating magnesium nitrate solid to make it decompose so as to obtain magnesite, i.e. magnesium oxide with chemical name. The steps of the chemical preparation method of magnesite according to the present invention are described in detail below;
the preparation of magnesium hydroxide comprises adding lime into seawater or brine after solar salt drying, mixing at a weight ratio of 1: 0.002-0.01, stirring thoroughly, filtering, removing impurities, and collecting the solution.
The main components in the seawater are water NaCl and MgCl, and the main component in the brine after solar salt drying is MgCl.
The chemical reaction formula of this step is therefore:
or
The magnesium nitrate solution is prepared by adding nitric acid into magnesium hydroxide solution, and the magnesium nitrate solution is prepared by adding nitric acid with the concentration of 69% into the magnesium hydroxide solution according to the weight ratio of 1: 2-4 and fully stirring and mixing;
the chemical reaction formula of the step is as follows:
the purification of magnesium nitrate solution is completed by adding magnesium bicarbonate into magnesium nitrate solution, and the steps are that the magnesium nitrate solution and the magnesium bicarbonate are mixed and reacted according to the weight ratio of 1: 0.008-0.012, and the reaction temperature is controlled at 80-120 ℃. The reaction mainly removes calcium nitrate in the solution to generate calcium carbonate precipitate, which is removed by filtration.
The reaction equation is:
CaCO3the precipitate was removed by static filtration.
The magnesium bicarbonate is prepared by reacting magnesium chloride with ammonium bicarbonate, and the reaction temperature is controlled at 40-70 ℃.
The reaction equation is
The reaction equation is NO2Recovering the by-product of the decomposition reaction and reacting the by-product with water to produce nitrous acid,
the reaction is Because nitrous acid is unstable, it is partially oxidized by oxygen to nitric acid and then reused.
The reaction is
Compared with the prior art, the chemical preparation method of the magnesite has the advantages of simple production process, sufficient raw materials, no three-waste pollution, low production cost, high product purity and the like, the production cost can be reduced by 30 percent compared with the prior art, the purity can reach 99 percent, and the prior art is generally about 97 percent. Compared with the prior art, the chemical preparation method of the magnesite has the advantages of simple production process, sufficient raw materials, no discharge of three wastes, low production cost, high product purity and the like, and has good popularization and use values.
Claims (6)
1. A chemical process for preparing magnesium sand includes such steps as preparing magnesium hydroxide, preparing magnesium nitrate, purifying magnesium nitrate and preparing magnesium sand, and features that the magnesium sand is prepared through adding lime to seawater or brine, adding nitric acid to magnesium hydroxide solution to obtain magnesium nitrate solution, adding magnesium bicarbonate to magnesium nitrate solution to purify it, evaporating water from said solution to obtain solid magnesium nitrate, and heating for decomposing it to obtain magnesium sand.
2. The method of claim 1, wherein the step of adding lime to the seawater or solar brine to prepare magnesium hydroxide comprises adding lime to the seawater or solar brine, mixing at a weight ratio of 1: 0.002-0.01, stirring thoroughly, filtering to remove precipitate, and collecting the magnesium hydroxide solution for use.
3. The method as set forth in claim 1, wherein the magnesium nitrate solution is prepared by adding nitric acid to a magnesium hydroxide solution, and the step of adding nitric acid having a concentration of 69% to the magnesium hydroxide solution in a ratio of 1: 2-4 by weight, and mixing them with stirring.
3. The method of claim 1, wherein the purification of the magnesium nitrate solution is performed by adding magnesium bicarbonate to the magnesium nitrate solution, and the step of mixing and reacting the magnesium nitrate and the magnesium bicarbonate in a ratio of 1: 0.008-0.012 by weight, and the reaction temperature is controlled to 80-120 ℃.
4. The process of claim 3, wherein the magnesium bicarbonate is prepared by reacting magnesium chloride with ammonium bicarbonate at a temperature of 40-70 ℃.
5. The method of claim 1, wherein the magnesite is produced by heating a magnesium nitrate solid solution to evaporate water to produce a magnesium nitrate solid, and further heating the solid to 200 ℃ to decompose the magnesium nitrate to produce magnesite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95110422 CN1114289A (en) | 1995-04-24 | 1995-04-24 | Chemical process for producing magnesium sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95110422 CN1114289A (en) | 1995-04-24 | 1995-04-24 | Chemical process for producing magnesium sand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1114289A true CN1114289A (en) | 1996-01-03 |
Family
ID=5077807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95110422 Pending CN1114289A (en) | 1995-04-24 | 1995-04-24 | Chemical process for producing magnesium sand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1114289A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106830021A (en) * | 2017-03-20 | 2017-06-13 | 青海盐湖工业股份有限公司 | A kind of preparation technology of magnesium nitrate hexahydrate |
-
1995
- 1995-04-24 CN CN 95110422 patent/CN1114289A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106830021A (en) * | 2017-03-20 | 2017-06-13 | 青海盐湖工业股份有限公司 | A kind of preparation technology of magnesium nitrate hexahydrate |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |