CN1150123A - Production of magnesium carbonate by carbonizing process of magnesite - Google Patents
Production of magnesium carbonate by carbonizing process of magnesite Download PDFInfo
- Publication number
- CN1150123A CN1150123A CN 96113037 CN96113037A CN1150123A CN 1150123 A CN1150123 A CN 1150123A CN 96113037 CN96113037 CN 96113037 CN 96113037 A CN96113037 A CN 96113037A CN 1150123 A CN1150123 A CN 1150123A
- Authority
- CN
- China
- Prior art keywords
- magnesite
- magnesium carbonate
- magnesium
- carbonization
- follows
- 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.)
- Granted
Links
Abstract
A process for producing magnesium carbonate by carbonizing magnesite includes calcination of raw material, digestion at 60 +/- 10 deg.C with material controlled at 200-300 meshes of granularity, carbonizing, liquid-solid separation, thermolysis, and solid-liquid separation to obtain the product, and features easy digestion of magnesite ore, high effect and quality of product, and simplified separation process.
Description
The invention relates to a method for producing magnesium carbonate, in particular to a method for producing magnesium carbonate by a magnesite carbonization method.
Magnesium salt production raw materials are roughly divided into two types, one type is bittern in seawater or lake water, the other type is mineral raw materials, mainly comprising dolomite and magnesite, wherein the dolomite mainly comprises about 40% of magnesium carbonate and about 50% of calcium carbonate; the magnesium carbonate in magnesite is about 90%. The current magnesium carbonate production methods have three types: soda method, ammonium carbonate method, carbonization method. The research on the new process for preparing magnesium oxide by the carbonization method, which is recorded by mr.c. Chen thought, is described on pages 17-21 of a publication published by the eighth national magnesium salt technical information exchange society, journal of 10.1995, and inorganic salt information station of Ministry of chemical industry, and magnesium salt technical data is referred to. The production of magnesium carbonate by the dolomite carbonization method is a commonly used method at present. However, dolomite is used as a raw material, the highest magnesium carbonate content is forty-two percent, the rest is calcium carbonate, calcium and magnesium are difficult to separate in the production process, the calcium is difficult to separate completely at one time, the calcium in the magnesium is difficult to reach high-grade products, the calcium output value of the by-product is low, and the by-product contains magnesium and is unpopular, so the dolomite is used as the raw material, the energy consumption is high, and the cost is high. The calcium carbonate is produced by using magnesite as a raw material and adopting a carbonization method, and a carbonization method production process is not formed until now because the magnesite is not easy to digest.
The invention aims to solve the problem of difficult digestion of magnesite by utilizing the characteristic of high magnesium content of the magnesite, and the magnesite is used as a raw material to form a new process for producing magnesium carbonate by a carbonization method, thereby reducing energy consumption, simplifying a separation process, improving product purity and reducing cost.
The technical scheme of the invention is as follows:
the magnesium carbonate is prepared by taking magnesite as a raw material through the following process steps:
and (3) calcining: mixing and calcining the raw materials and coal, wherein the main reaction formula is as follows:
digestion: crushing the calcined material, adding water, and stirring to prepare a suspension, wherein the main reaction formula is as follows:
carbonizing: diluting the digested suspension, then pumping the diluted suspension into a carbonization tower for convection carbonization, wherein carbon dioxide used for carbonization is obtained by purifying kiln gas for calcining magnesite, and the main reaction formula is as follows:
liquid-solid separation: removing solid impurities in the magnesium bicarbonate solution;
pyrolysis: pyrolyzing the impurity-removed magnesium bicarbonate solution at the temperature of 80-100 ℃, wherein the reaction formula is as follows:
solid-liquid separation: and separating the pyrolyzed magnesium carbonate from the liquid, drying to obtain a magnesium carbonate product, and returning the waste water to the digestion process.
The particle size of the material during digestion is 200-300 meshes.
The digestion temperature is 60 ℃ +/-10 ℃.
Calcining the prepared magnesium carbonate at the temperature of 800-900 ℃ to obtain magnesium oxide, wherein the reaction formula is as follows:
the obtained carbon dioxide is returned to the carbonization procedure for use.
The invention has the advantages that:
(1) high recovery rate and energy conservation: the magnesium salt is produced by a carbonization method, the magnesium raw material accounts for one fourth of the cost, electricity and coal account for three quarters of the cost, five tons of ore are needed for producing one ton of magnesium carbonate, 40 yuan per ton is totally 200 yuan, the magnesite only needs two tons, 120 yuan per ton is totally 240 yuan, which is slightly higher than the dolomite, 4 tons of coal is needed for producing the magnesium salt per ton of the dolomite, 2 tons of the magnesite only need 2 tons, and 200 yuan is saved for 100 yuan per ton. Electricity: dolomite consumes 1000 kilowatts per ton, magnesite consumes 500 kilowatts per ton, the electricity price per kilowatt is 0.50 yuan, 500 kilowatts are saved by 250 yuan, and all other workloads are approximately reduced by half. The effective energy consumption of the dolomite carbonization method for magnesium salts is more than 40 percent, while the effective energy consumption of the magnesite carbonization method is more than 90 percent. The recovery rate is more than one time with the same energy consumption.
(2) And the simplified separation process: the high-quality magnesite contains less than five percent of impurities such as silicon, calcium, aluminum and the like, the main component of the high-quality magnesite is magnesium carbonate, dolomite also contains five percent of impurities such as silicon, calcium, aluminum and the like, the high-quality magnesite contains only 42 percent of magnesium carbonate and 53 percent of calcium carbonate. The calcium and magnesium separation can be carried out after the main process flow of carbonization is completed, the separation is difficult to separate at one time, the separated calcium is dried, dried and crushed, the calcium carbonate serving as a byproduct is recycled (the price of the calcium carbonatedoes not exceed 500 yuan tons), and two sets of equipment are required to operate in the latter half part respectively, so that the trouble is increased.
(3) The purity of the product is easy to improve:
the chemical products are high-grade with high content and less impurities. The magnesium salt is also equal to or less than 0.751 percent of various impurity-containing total (excluding water) and 1.2 percent of first-grade products of superior products of industrial hydrated basic magnesium carbonate. The total impurity content of the high-class products of the industrial magnesium oxide is less than or equal to 1.3853 percent, the first-class products are less than or equal to 2 percent, and the qualified products are less than or equal to 2.85 percent.
As for the magnesium content, the high-quality raw magnesite ore reaches the magnesium-containing standard of high-quality products. Therefore, the whole process flow aims at removing impurities and purifying. The high-quality magnesite contains not more than 4 impurities, wherein the impurities mainly comprise silicon, calcium, aluminum, manganese and the like. And the calcium content of the B-type ore is not more than 1 percent, and the silicon and aluminum are insoluble in the flow and can be easily removed together with the calcium carbonate during filtration. Iron, manganese, etc. are discharged in several precipitations. When the process is well done, the impurities can be removed basically in one process, and all products are superior products. If the chemical reagent grade product market exists, the reagent grade standard can be achieved through twice impurity removal. The high-purity magnesium salt (containing impurities less than 0.5 percent) can be directly used for refining metal magnesium or high-purity high-density electro-dissolved magnesium, and has wider market and better benefit.
At present, magnesium salt manufacturers in China mostly use a dolomite carbonization method, the cost for producing each ton of industrial hydrated basic magnesium carbonate is about 2500 yuan, and the production cost by using the magnesite carbonization method is not more than 1500 yuan. The benefit is obvious.
Example (b):
the specific technological scheme of magnesium oxide produced by magnesite carbonization is as follows:
and (3) calcining: magnesite with the magnesium carbonate content of more than 90 percent and the particle size of 1-5 cm, raw materials and coal are mixed according to the proportion of 4: 1-6: 1, the calcination temperature of a thirty-cubic-meter vertical kiln is 1000 ℃, and the main reaction formula is as follows:
digestion: pulverizing coarse powder into 250 meshes by using a hammer crusher, pulverizing fine powder into 250 meshes by using a Raymond mill, stirring two digestion tanks by using a 5 cubic meter belt, controlling the water temperature to be 60 +/-10, digesting for 2 hours by using a liquid-solid ratio of 4: 1, and obtaining a main reaction formula:
carbonizing: 2M×5MTwo carbonization towers are used, carbon dioxide gas is collected from the vertical kiln, purified and then subjected to convection carbonization in the towers, phenol elimination indicator is used for finishing carbonization without color development, the liquid-solid ratio is 10: 1, the temperature is 30 ℃, and the reaction formula is as follows:
liquid-solid separation: and (3) pressing out the solution containing the magnesium bicarbonate by using a 40 square meter plate-and-frame filter press, and discharging solid impurities.
Pyrolysis: 630X 8500 pyrolyzer, continuous pyrolysis, temperature 98-100 deg.C, 15-17 minutes, reaction formula:
solid-liquid separation: and (4) pressing out a magnesium carbonate filter cake by using a 40 square meter plate-and-frame filter press, and returning the waste water to the digester for use.
Drying: drying at 200 deg.C with a Baba type dryer, pulverizing, and packaging to obtain magnesium carbonate product.
And (3) calcining: keeping the dried magnesium carbonate at the constant temperature of 900 ℃ for 5 hours by a rotary calcining furnace to obtain magnesium oxide, wherein the reaction formula is as follows:
collecting carbon dioxide and returning to the carbonization process for use.
In addition: the magnesium hydroxide is directly obtained by utilizing the digestion process.
Claims (3)
1. The magnesium carbonate is produced by a magnesite carbonization method, the magnesium carbonate is produced by taking magnesite as a raw material through the following process steps:
and (3) calcining: mixing and calcining the raw materials and coal, wherein the main reaction formula is as follows:
digestion: crushingthe calcined material, adding water, and stirring to prepare a suspension, wherein the main reaction formula is as follows:
carbonizing: diluting the digested suspension, then pumping the diluted suspension into a carbonization tower for convection carbonization, wherein carbon dioxide used for carbonization is obtained by purifying kiln gas for calcining magnesite, and the main reaction formula is as follows:
liquid-solid separation: removing solid impurities in the magnesium bicarbonate solution;
pyrolysis: pyrolyzing the impurity-removed magnesium bicarbonate solution at the temperature of 80-100 ℃, wherein the reaction formula is as follows:
solid-liquid separation: separating the pyrolyzed magnesium carbonate from the liquid and drying to obtain a magnesium carbonate product, and returning the waste water to the digestion process;
the method is characterized in that: the granularity of the materials used in digestion is controlled to be 200 meshes and 300 meshes.
2. The process for producing magnesium carbonate by carbonizing magnesite according to claim 1, wherein: the digestion temperature is controlled within the range of 60 ℃ plus or minus 10 ℃.
3. The process for producing magnesium carbonate by carbonizing magnesite according to claim 1 or 2, wherein: calcining the prepared magnesium carbonate at the temperature of 800-900 ℃ to obtain magnesium oxide, wherein the reaction formula is as follows:
the obtained carbon dioxide is returned to the carbonization procedure for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96113037A CN1059407C (en) | 1996-09-20 | 1996-09-20 | Production of magnesium carbonate by carbonizing process of magnesite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96113037A CN1059407C (en) | 1996-09-20 | 1996-09-20 | Production of magnesium carbonate by carbonizing process of magnesite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1150123A true CN1150123A (en) | 1997-05-21 |
| CN1059407C CN1059407C (en) | 2000-12-13 |
Family
ID=5121728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96113037A Expired - Fee Related CN1059407C (en) | 1996-09-20 | 1996-09-20 | Production of magnesium carbonate by carbonizing process of magnesite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1059407C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1302993C (en) * | 2004-04-07 | 2007-03-07 | 田玉海 | Production of light magnesium carbonate or light magnesium oxide |
| CN100368295C (en) * | 2004-12-17 | 2008-02-13 | 丹东玉龙镁业有限公司 | Method for producing light magnesium carbonate by utilizing magnesite tailings |
| CN105540625A (en) * | 2016-01-25 | 2016-05-04 | 化工部长沙设计研究院 | Method for preparing anhydrous magnesium carbonate through magnesium-containing mother solution |
| CN106012024A (en) * | 2015-09-15 | 2016-10-12 | 李治涛 | Method and apparatus for production of basic magnesium carbonate and magnesium oxide whisker from magnesite |
| CN108408746A (en) * | 2018-04-10 | 2018-08-17 | 刘献斌 | The double of light magnesium oxide subtract carbonization manufacture method |
| CN109071251A (en) * | 2016-04-04 | 2018-12-21 | 破坏性材料公司 | Getter material and its production method comprising intrinsic composite nanoparticle |
| CN109790044A (en) * | 2016-07-27 | 2019-05-21 | 国家科学研究学院 | The magnesia of low-carbon emission produces |
-
1996
- 1996-09-20 CN CN96113037A patent/CN1059407C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1302993C (en) * | 2004-04-07 | 2007-03-07 | 田玉海 | Production of light magnesium carbonate or light magnesium oxide |
| CN100368295C (en) * | 2004-12-17 | 2008-02-13 | 丹东玉龙镁业有限公司 | Method for producing light magnesium carbonate by utilizing magnesite tailings |
| CN106012024A (en) * | 2015-09-15 | 2016-10-12 | 李治涛 | Method and apparatus for production of basic magnesium carbonate and magnesium oxide whisker from magnesite |
| CN105540625A (en) * | 2016-01-25 | 2016-05-04 | 化工部长沙设计研究院 | Method for preparing anhydrous magnesium carbonate through magnesium-containing mother solution |
| CN105540625B (en) * | 2016-01-25 | 2017-04-26 | 化工部长沙设计研究院 | Method for preparing anhydrous magnesium carbonate through magnesium-containing mother solution |
| CN109071251A (en) * | 2016-04-04 | 2018-12-21 | 破坏性材料公司 | Getter material and its production method comprising intrinsic composite nanoparticle |
| CN109790044A (en) * | 2016-07-27 | 2019-05-21 | 国家科学研究学院 | The magnesia of low-carbon emission produces |
| US11401168B2 (en) | 2016-07-27 | 2022-08-02 | Institut National De La Recherche Scientifique | Production of low carbon footprint magnesia |
| CN108408746A (en) * | 2018-04-10 | 2018-08-17 | 刘献斌 | The double of light magnesium oxide subtract carbonization manufacture method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1059407C (en) | 2000-12-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104016393B (en) | A kind of by dolomite for light calcium carbonate and method of magnesium oxide | |
| CN111547697B (en) | Method for repairing waste lithium iron phosphate material | |
| CN104445300A (en) | Method of preparing magnesium hydroxide and calcium carbonate and separating out phosphorus ores by taking phosphate tailings as raw materials through ammonia circulation process | |
| CN1944259A (en) | Process for producing industrial magnesium oxide using dolomite ash and boron mud | |
| CN1059407C (en) | Production of magnesium carbonate by carbonizing process of magnesite | |
| CN1618998A (en) | Method of preparing high purity magnesiun sand using salt lake bischofite as raw material | |
| CN110438338A (en) | The device and method of nickel, cobalt co-production magnesia is recycled from nickel cobalt magnesium waste liquid | |
| CN101838006A (en) | Novel method for separating strontium carbonate waste slag acid leaching slurry | |
| CN101306819A (en) | Process for abstracting white carbon black from fly ash or slag | |
| CN1408666A (en) | process for producing magnesium oxide from waste magnesite ore | |
| CN102838141A (en) | Process for producing magnesium hydrate by removing silicon and aluminum from magnesite | |
| CN115072749B (en) | Method for extracting lithium from spodumene without slag | |
| CN1163415C (en) | High-purity iron oxide red producing process with iron ore powder and other iron-bearing material | |
| CN115784285A (en) | CO (carbon monoxide) 2 Method for preparing nano calcium carbonate by indirectly mineralizing carbide slag | |
| CN115141941A (en) | Comprehensive utilization method of dolomite | |
| CN112978762B (en) | System and method for preparing magnesium aluminate spinel and co-producing ammonium sulfate | |
| CN115505740A (en) | Resource method for treating red mud by adopting nitrate wastewater | |
| CN1299992C (en) | High purity magnesium oxide cleaning production method | |
| CN112374522A (en) | Barite high-purity purification process | |
| CN1623901A (en) | Technology for producing aluminium oxide | |
| CN103145166B (en) | Calcium and magnesium separation method for dolomite carbonization process and application thereof | |
| CN110817878A (en) | Method for preparing calcium carbide from calcium carbide slag | |
| CN1102126C (en) | Calcining and converting reaction process of preparing white carbon with clay mineral | |
| CN1408904A (en) | Process for producing high purity magnesium oxide monocrystal using waste magnesite ore | |
| CN1789133A (en) | Method for producing light magnesium carbonate by utilizing magnesite tailings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |