CN102838141A - Process for producing magnesium hydrate by removing silicon and aluminum from magnesite - Google Patents
Process for producing magnesium hydrate by removing silicon and aluminum from magnesite Download PDFInfo
- Publication number
- CN102838141A CN102838141A CN2012103818959A CN201210381895A CN102838141A CN 102838141 A CN102838141 A CN 102838141A CN 2012103818959 A CN2012103818959 A CN 2012103818959A CN 201210381895 A CN201210381895 A CN 201210381895A CN 102838141 A CN102838141 A CN 102838141A
- Authority
- CN
- China
- Prior art keywords
- magnesite
- marinco
- sial
- reaction
- light
- 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
Links
Images
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to a process for producing magnesium hydrate by removing silicon and aluminum from magnesite. The process comprises the following flows of carrying out calcining, digesting, calcium removal, silicon and aluminum removal, filtering, washing, drying and the like on the magnesite, the contents of the silicon and the aluminum in the magnesium hydrate can be reduced to 0.1 percent, and the content of the magnesium hydrate can reach higher than 98 percent. According to the process, a magnesium hydrate particle growth process and a silicon and aluminum removal process are organically combined, a product can be directly applied to the fields of fire retardants and the like, and other magnesium-containing products with high added values, such as industrial magnesium oxide, electrician level magnesium oxide, light-weigh magnesium carbonate and the like can be further processed and produced. The process has the advantages of simple flows, good silicon and aluminum removal effect, low energy consumption, small pollution, high purity of a magnesium hydrate product, and the like.
Description
Technical field
The invention belongs to mineral processing and technical field of inorganic chemical industry.Being specifically related to magnesite is raw material, removes wherein calcium, silicon, aluminium through chiral process, produces the production technique of high purity magnesium hydroxide material.
Background technology
At present, domestic magnesite stores abundant, 3,000,000,000 tons of total retained reserves; Rank first in the world, it is the important source material of MAGNESIUM METAL 99 and magnesian, in recent years since to the magnesian demand increase sharply and increasingly high to the magnesian specification of quality; The tempo of development of magnesite rapidly increases; The reasonableness of mine development is destroyed, existed high-quality magnesite overexploitation is used, high-quality resource quantity constantly reduces; On the other hand, market is but increasing sharply to the demand of high-purity magnesium material.How utilizing low-grade magnesite or mine tailing to prepare high-quality magnesia product is a problem demanding prompt solution, is the requirement of the production realization Sustainable development of Magnesium Chemical Materials.
The utilization of low-grade magnesite is after calcining and generates Natural manganese dioxide and continue reaction and be able to utilize again.Different each substances content in the low-grade magnesite place of production are also different, but the kind of impurity is basic identical, and the impurity of magnesite mainly contains calcium; Silicon and aluminium; Calcium exists with the form of lime carbonate, and silicon exists with the form of silicon-dioxide, and aluminium exists with the form of aluminum oxide; Aluminum oxide and silicon-dioxide are that magnesite is produced the main existence form of acid non-soluble substance in the magnesium chemical products, and the existence of these materials will directly have influence on the purity of Natural manganese dioxide and magnesium hydroxide products and to the requirement of its acid non-soluble substance.CN102126734A has done detailed explanation for deliming technology patent.
The CN101219800 patent 800～1200 ℃ of calcinings down, prepares Natural manganese dioxide with the magnesite breeze; The pH value that Natural manganese dioxide and sulfuric acid or nitric acid reaction is prepared solubility magnesium salts (sal epsom or magnesium nitrate) solution and regulation system is 3～9; With reacted slurries filtration, will filtrate and alkali (can be sodium hydroxide and ammoniacal liquor) reaction, CONTROL PROCESS condition, prepared sizes be nano level, be shaped as flaky Marinco H slurry; With slurry ageing, filtration, washing, drying, break up and make the nanometric magnesium hydroxide product.
The CN1401573A patent has been described by magnesite combination producing sal epsom; The method of magnesiumcarbonate and magnesium hydroxide products; Magnesia powder with after the magnesite calcining is a raw material; Natural manganese dioxide mixes with ammoniumsulphate soln, adds industrial sulphuric acid and carries out the molten and ammonia still process reaction of acid, and the ammoniacal liquor reaction of generation in Adlerika that obtains and the reaction obtains magnesium hydroxide products.
It is the raw material production Marinco H that the CN1868952A patent has been described with magnesite; Raw material is placed in traditional carbonization kiln is sintered into Natural manganese dioxide; Again Natural manganese dioxide is processed slurry; Slurry makes magnesiumcarbonate in the carbonating tower carbonization, and the acid solution acidolysis of warp 98% again adds ammoniated brine at last and generates Marinco H.
Document " light metal " first phase in 2007 report " technical study of low-grade magnesite ore dressing and desiliconizing ".The document is described the technology that has proposed low-grade magnesite ore dressing and desiliconizing " once levigate-direct flotation ".Through carrying out grinding fineness condition test, sodium carbonate amount test, collecting agent, dispersion agent kind and composite test, roughly select flotation time test, SiO2 content reduces to 2.15%, the MgO recovery 46.55% from 11.77%.
Above patent and document are to magnesite being feedstock production when preparing magnesium chemical products, and the method for removing sial mainly contains acid pasting, carborization and flotation process etc.; Acid pasting is handled for magnesite is carried out acidolysis through calcining, and the acid of employing is sulfuric acid or hydrochloric acid, utilizes the reactivity worth of aluminum oxide and silicon oxide and acid poor, has reached the purpose that sial is removed through filtering; Carborization is to utilize Natural manganese dioxide that magnesite calcining obtains through hydration reaction, the Marinco H slurry that obtains and kiln gas (carbonic acid gas) reaction, realization magnesium salts and sial separate impurities; The third situation adopts flotation process to remove impurity; Acid hydrolyzation is higher to the decreasing ratio of sial, and its shortcoming is to need a large amount of acid, and flow process is complicated, and the storage of acid and transportation also bring certain safety-problems in addition; Carborization is high to the decreasing ratio of sial, but exists process complicated, and technical process is long, the problem that production cost is high; Flotation process will be through floatation process repeatedly, but it is undesirable to remove the sial effect, does not reach in the industrial hydrogen Natural manganese dioxide GB the acid non-soluble substance specification of quality.
Summary of the invention
The present invention provides a kind of magnesite to remove the technology that sial is produced Marinco H for solving the problem in the present technology, and it has product purity height, simple, the low power consumption and other advantages of technology.
Thinking of the present invention is; Magnesite is calcined at a certain temperature, generated light-magnesite powder, the water of light-magnesite powder and certain temperature is carried out the thick slurries of digestion reaction generation Marinco H; In slurries, add and remove sial agent (solubility property bases); The silicate that makes silicon-dioxide and aluminum oxide and its reaction generate solubility gets into solution with aluminate, obtains Marinco H filter cake and siliceous and solution aluminium salt behind the dope filtration, thereby silicon and aluminium removes and separate in the realization magnesite.The Marinco H filter cake obtains acid non-soluble substance less than 0.2% through washing drying, and Marinco H content is greater than the magnesium hydroxide products more than 98%.The chemical reaction that whole process relates to is following:
MgCO
3→MgO+CO
2↑
MgO+H
2O→Mg(OH)
2↓
SiO
2+NaOH→Na
2SiO
3
Al
2O
3+2NaOH?→2NaAlO
2
The present invention adopts following technical scheme to be achieved:
A kind of magnesite of the present invention removes sial technology, and it may further comprise the steps:
A, magnesite calcining: magnesite is crushed to 60～80mm, in retort furnace, calcines, temperature is controlled at 700～1050 ℃, and calcination time 1～10h makes light-magnesite powder.
B, said light-magnesite powder mixed with water carry out digestion reaction, generate hydrogeneous magnesian slurries.50～95 ℃ of the water temps of said digestion reaction, the mass ratio of water and light-magnesite powder are 2～10:1, and digestion time is 0.5～4 hour; Carrying out deliming then handles.
C, the material that in said step b gained slurries, adds silica removal, aluminium promptly remove agent; Squeeze into reaction kettle after the mixing; 120 ℃～190 ℃ of temperature of reaction, in 0.5～4 hour reaction times, the add-on of silica removal aluminum material is 2～10 times of sial mole number summation in the light calcined magnesia.
D, the slurry that above-mentioned steps c is removed behind the sial filter, and obtain the solution of Marinco H filter cake and silicon-aluminum containing salt, and filter cake is used water washing, and water consumption is 2～10 times of filter cake weight.
E, the filter cake after will washing be 110-150 ℃ of drying 2～5 hours, obtain acid non-soluble substance less than 0.2%, Marinco H content is greater than 98% magnesium hydroxide products.
It is said that to remove agent be that the material of silica removal, aluminium is sodium hydroxide, Pottasium Hydroxide, Lithium Hydroxide MonoHydrate, yellow soda ash, salt of wormwood a kind of or its mixture wherein.
Preferably, among the said step b, the mass ratio of water and light-magnesite powder is 5:1, and the water temp of digestion reaction is 70～75 ℃.
Preferably, temperature of reaction is 170～175 ℃ among the said step c, and optimal reaction temperature is 170 ℃.
Preferably, the add-on of described silica removal aluminum material is the silicon oxide that contains in the light calcined magnesia and 5 times of aluminum oxide mole number summation.
Preferably, described a kind of magnesite removes sial technology, and it specifically may further comprise the steps:
With weight is that the magnesite of 300g is crushed to 60～80mm, puts into retort furnace and calcines, and temperature is controlled at 1050 ℃, calcination time 6 hours, light-magnesite powder;
Light-magnesite powder mixed with water carry out digestion reaction, generate hydrogeneous magnesian slurries, 70 ℃ of the water temps of said digestion reaction, the mass ratio of water and light-magnesite powder are 5:1, and digestion time is 2 hours; Carrying out deliming then handles;
The magnesium hydroxide slurry adding of above-mentioned steps gained is removed agent sodium hydroxide, extraordinarily go into 80.7 gram sodium hydroxide, squeeze into reaction kettle after the mixing according to 5 of silicon oxide that contains in the light calcined magnesia and aluminum oxide mole number summation; 170～175 ℃ of controlled temperature; In 1.5 hours reaction times, reacted slurries through filtering, are used the 1.2L water washing; 120 ℃ of dryings 3 hours, magnesium hydroxide products.
The present invention compared with prior art has following significant advantage:
(1) it is obvious to remove in the magnesite sial impurity effect, and decreasing ratio can reach 98.8%.Through magnesite through calcining, digestion, deliming, remove processes such as sial, filtration, washing and drying, can make Marinco H sial content reduce to 0.1%, Marinco H content reaches more than 98%.
(2) grow up for the particle of Marinco H good growing environment is provided, reduced surface polarity, particle is difficult for reuniting.Obtained low surface area, the good dispersivity of magnesium hydroxide products especially is suitable as fire retardant and uses.
(3) it has product purity height, simple, the low power consumption and other advantages of technology.
Description of drawings
Fig. 1 is to remove the Marinco H SEM figure that agent obtains for the present invention uses sodium hydroxide.
Fig. 2 is to remove the Marinco H XRD figure that agent obtains for the present invention uses sodium hydroxide.
Fig. 3 is to remove the Marinco H SEM figure that agent obtains for the present invention uses Pottasium Hydroxide.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further detailed description.
Fig. 1 is to remove the Marinco H SEM figure that agent obtains for the present invention uses sodium hydroxide.
Fig. 2 is to remove the Marinco H XRD figure that agent obtains for the present invention uses sodium hydroxide.A is the standard spectrogram among Fig. 2, and b is the sample spectrogram.
Fig. 3 is to remove the Marinco H SEM figure that agent obtains for the present invention uses Pottasium Hydroxide.
Embodiment 1:
(1) is that 300g magnesite (containing MgO 90%, silicon-dioxide 6.6%, aluminum oxide 2.5%) is crushed to 60～80mm with weight, puts into the retort furnace calcining temperature and be controlled at 850 ℃ that calcination time 6 hours makes light-magnesite powder.
(2) light-magnesite powder is mixed with water carry out digestion reaction, generate hydrogeneous magnesian slurries.70 ℃ of the water temps of said digestion reaction, the mass ratio of water and light-magnesite powder are 5:1, and digestion time is 2 hours; Carrying out deliming according to the described deliming method of patent CN102126734A handles.
(3) the magnesium hydroxide slurry adding with the above-mentioned steps gained removes agent sodium hydroxide, extraordinarily goes into (80.7 gram) according to 5 of silicon oxide that contains in the light calcined magnesia and aluminum oxide mole number summation.Squeeze into reaction kettle after the mixing, 170～175 ℃ of controlled temperature, 1.5 hours reaction times, reacted slurries through filtering, use the 1.2L water washing, 120 ℃ of dryings 3 hours, finally silicon-dioxide and alumina content sum were 0.05%, clearance has reached 99.2%.Marinco H content 98.8%
Embodiment 2:
(1) is that 300g magnesite (containing MgO 80%, silica 1 5.1%, aluminum oxide 3.2%) is crushed to 60～80mm with weight, puts into the retort furnace calcining temperature and be controlled at 950 ℃ that calcination time 6 hours makes light-magnesite powder.
(2) light-magnesite powder is mixed with water carry out digestion reaction, generate hydrogeneous magnesian slurries.95 ℃ of the water temps of said digestion reaction, the mass ratio of water and light-magnesite powder are 6:1, and digestion time is 3 hours; Carrying out deliming handles.
(3) magnesium hydroxide slurry with above-mentioned (2) step gained adds sodium hydroxide, extraordinarily goes into (237.75 gram) according to 7 of silicon oxide that contains in the light calcined magnesia and aluminum oxide mole number summation.Squeeze into reaction kettle after the mixing, 185～190 ℃ of controlled temperature, 3 hours reaction times, reacted slurries through filtering, use the 1L water washing, 130 ℃ of dryings 3 hours, finally silicon-dioxide and alumina content sum were 0.08%, clearance has reached 98.9%.Marinco H content 98.5%.
Embodiment 3:
(1) is that 300g magnesite (containing MgO 90%, silicon-dioxide 6.6%, aluminum oxide 2.5%) is crushed to 60～80mm with weight, puts into the retort furnace calcining temperature and be controlled at 1050 ℃ that calcination time 6 hours makes light-magnesite powder.
(2) light-magnesite powder is mixed with water carry out digestion reaction, generate hydrogeneous magnesian slurries.75 ℃ of the water temps of said digestion reaction, the mass ratio of water and light-magnesite powder are 5:1, and digestion time is 2 hours; Carrying out deliming according to the described deliming method of patent CN102126734A handles.
(3) magnesium hydroxide slurry with above-mentioned (2) step gained adds Pottasium Hydroxide, extraordinarily goes into (113 gram) according to 5 of silicon oxide that contains in the light calcined magnesia and aluminum oxide mole number summation.Squeeze into reaction kettle after the mixing, 170～175 ℃ of controlled temperature, 1.5 hours reaction times, reacted slurries through filtering, use the 1.2L water washing, 120 ℃ of dryings 3 hours, finally silicon-dioxide and alumina content summation were 0.07%, clearance has reached 99%.Marinco H content 98.3%.
Claims (8)
1. a magnesite removes the technology that sial is produced Marinco H, it is characterized in that it may further comprise the steps:
A, magnesite calcining: magnesite is crushed to 60～80mm, in retort furnace, calcines, temperature is controlled at 700～1050 ℃, and calcination time 1～10h makes light-magnesite powder;
B, said light-magnesite powder mixed with water carry out digestion reaction, generate hydrogeneous magnesian slurries.50～95 ℃ of the water temps of said digestion reaction, the mass ratio of water and light-magnesite powder are 2～10:1, and digestion time is 0.5～4 hour; Carrying out deliming then handles;
C, in said step b gained slurries, add and remove the material that agent is silica removal, aluminium; Squeeze into reaction kettle after the mixing; 120 ℃～190 ℃ of temperature of reaction, in 0.5～4 hour reaction times, the add-on of silica removal aluminum material is 2～10 times of sial mole number summation in the light calcined magnesia;
D, the slurry that above-mentioned steps c is removed behind the sial filter, and obtain the solution of Marinco H filter cake and silicon-aluminum containing salt, and filter cake is used water washing, and water consumption is 2～10 times of filter cake weight;
E, the filter cake after will washing be 110-150 ℃ of drying 2～5 hours, obtain acid non-soluble substance less than 0.2%, Marinco H content is greater than 98% magnesium hydroxide products.
2. the described a kind of magnesite of claim 1 removes the technology that sial is produced Marinco H, it is characterized in that, said to remove agent be sodium hydroxide, Pottasium Hydroxide, Lithium Hydroxide MonoHydrate, yellow soda ash, salt of wormwood a kind of or its mixture wherein.
3. the described a kind of magnesite of claim 1 removes the technology that sial is produced Marinco H, it is characterized in that the mass ratio of water and light-magnesite powder is 5:1 among the said step b.
4. the described a kind of magnesite of claim 1 removes the technology that sial is produced Marinco H, it is characterized in that the water temp of digestion reaction is 70～75 ℃ among the said step b.
5. the described a kind of magnesite of claim 1 removes the technology that sial is produced Marinco H, it is characterized in that temperature of reaction is 170～175 ℃ among the said step c.
6. the described a kind of magnesite of claim 1 removes the technology that sial is produced Marinco H, it is characterized in that temperature of reaction is 170 ℃ among the said step c.
7. the described a kind of magnesite of claim 1 removes the technology that sial is produced Marinco H, it is characterized in that, the add-on of described silica removal aluminum material is the silicon oxide that contains in the light calcined magnesia and 5 times of aluminum oxide mole number summation.
8. the described a kind of magnesite of claim 1 removes the technology that sial is produced Marinco H, it is characterized in that it specifically may further comprise the steps:
With weight is that the magnesite of 300g is crushed to 60～80mm, puts into retort furnace and calcines, and temperature is controlled at 1050 ℃, calcination time 6 hours, light-magnesite powder;
Light-magnesite powder mixed with water carry out digestion reaction, generate hydrogeneous magnesian slurries, 70 ℃ of the water temps of said digestion reaction, the mass ratio of water and light-magnesite powder are 5:1, and digestion time is 2 hours; Carrying out deliming then handles;
The magnesium hydroxide slurry of above-mentioned steps gained is added sodium hydroxide, extraordinarily go into 80.7 gram sodium hydroxide, squeeze into reaction kettle after the mixing according to 5 of silicon oxide that contains in the light calcined magnesia and aluminum oxide mole number summation; 170～175 ℃ of controlled temperature; In 1.5 hours reaction times, reacted slurries through filtering, are used the 1.2L water washing; 120 ℃ of dryings 3 hours, magnesium hydroxide products.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103818959A CN102838141A (en) | 2012-10-10 | 2012-10-10 | Process for producing magnesium hydrate by removing silicon and aluminum from magnesite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103818959A CN102838141A (en) | 2012-10-10 | 2012-10-10 | Process for producing magnesium hydrate by removing silicon and aluminum from magnesite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102838141A true CN102838141A (en) | 2012-12-26 |
Family
ID=47365909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103818959A Pending CN102838141A (en) | 2012-10-10 | 2012-10-10 | Process for producing magnesium hydrate by removing silicon and aluminum from magnesite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102838141A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105731505A (en) * | 2016-04-26 | 2016-07-06 | 沈阳鑫博工业技术股份有限公司 | Preparing device and method for flame-retardant grade magnesium hydrate |
| CN112661178A (en) * | 2020-12-25 | 2021-04-16 | 山东信能达工程科技有限公司 | Preparation and production process of high-purity magnesium oxide |
| CN114196137A (en) * | 2021-12-27 | 2022-03-18 | 卢韩 | Preparation method of special-effect halogen-free flame retardant for PVC (polyvinyl chloride) |
| CN115583664A (en) * | 2022-11-01 | 2023-01-10 | 江西广源化工有限责任公司 | Magnesium hydroxide powder and preparation method and application thereof |
| CN116102042A (en) * | 2023-02-23 | 2023-05-12 | 山西瑞格金属新材料有限公司 | Method for simultaneously preparing metal magnesium and aluminum magnesium spinel from magnesite |
| CN116924788A (en) * | 2023-06-07 | 2023-10-24 | 营口仁威矿产有限公司 | High-purity high-density sintered magnesia-alumina spinel and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049145A (en) * | 1990-09-11 | 1991-02-13 | 营口市电熔镁砖厂 | A kind of preparation method of electrosmelted magnesite clinker |
| CN1291588A (en) * | 1999-08-27 | 2001-04-18 | 张晓宇 | Process for directly producing magnesium hydroxide from magnesite |
| CN101348268A (en) * | 2007-07-19 | 2009-01-21 | 东北大学 | Two comprehensive utilization methods of boron mud, giobertite and talc deposit for preparing magnesia and silicon dioxide |
| CN102126734A (en) * | 2011-01-25 | 2011-07-20 | 辽宁新发展耐火材料集团有限公司 | Process for removing calcium from magnesite |
-
2012
- 2012-10-10 CN CN2012103818959A patent/CN102838141A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049145A (en) * | 1990-09-11 | 1991-02-13 | 营口市电熔镁砖厂 | A kind of preparation method of electrosmelted magnesite clinker |
| CN1291588A (en) * | 1999-08-27 | 2001-04-18 | 张晓宇 | Process for directly producing magnesium hydroxide from magnesite |
| CN101348268A (en) * | 2007-07-19 | 2009-01-21 | 东北大学 | Two comprehensive utilization methods of boron mud, giobertite and talc deposit for preparing magnesia and silicon dioxide |
| CN102126734A (en) * | 2011-01-25 | 2011-07-20 | 辽宁新发展耐火材料集团有限公司 | Process for removing calcium from magnesite |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105731505A (en) * | 2016-04-26 | 2016-07-06 | 沈阳鑫博工业技术股份有限公司 | Preparing device and method for flame-retardant grade magnesium hydrate |
| CN112661178A (en) * | 2020-12-25 | 2021-04-16 | 山东信能达工程科技有限公司 | Preparation and production process of high-purity magnesium oxide |
| CN114196137A (en) * | 2021-12-27 | 2022-03-18 | 卢韩 | Preparation method of special-effect halogen-free flame retardant for PVC (polyvinyl chloride) |
| CN115583664A (en) * | 2022-11-01 | 2023-01-10 | 江西广源化工有限责任公司 | Magnesium hydroxide powder and preparation method and application thereof |
| CN116102042A (en) * | 2023-02-23 | 2023-05-12 | 山西瑞格金属新材料有限公司 | Method for simultaneously preparing metal magnesium and aluminum magnesium spinel from magnesite |
| CN116924788A (en) * | 2023-06-07 | 2023-10-24 | 营口仁威矿产有限公司 | High-purity high-density sintered magnesia-alumina spinel and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102583409B (en) | Method for producing mullite and calcium silicate by using high-alumina fly ash | |
| CN102531001B (en) | Comprehensive soda ash producing process and product application thereof | |
| CN102351226B (en) | Method for producing aluminum oxide from fly ash | |
| CN104445311B (en) | Poly-generation clean preparation method of high-content silicon dioxide fly ash | |
| CN101863500B (en) | Method for producing alumina with aluminum-containing metallurgical material | |
| CN101607720A (en) | With the bittern that contains magnesium chloride is the feedstock production method of magnesium oxide | |
| US20070191214A1 (en) | Process for the preparation of magnesia (MgO) from crude Mg (OH)2 | |
| CN101683988A (en) | Method for producing series magnesia chemical products by using material containing magnesium | |
| CN102838141A (en) | Process for producing magnesium hydrate by removing silicon and aluminum from magnesite | |
| CN103011630B (en) | Low-grade magnesite produces high purity magnesium hydroxide and method of magnesium oxide | |
| WO2013143335A1 (en) | Method for extracting aluminium oxide in fly ash by alkaline process | |
| CN102126734A (en) | Process for removing calcium from magnesite | |
| CN103121700A (en) | Method for preparing ultrafine alumina and coproducing and white carbon black by utilizing coal series kaolin | |
| CN102515221A (en) | Method for extracting alumina and amorphous silica from fly ash or coal gangue | |
| CN102757075A (en) | Method for preparing calcium carbonate powders of different structures and shapes | |
| CN101306819B (en) | Process for abstracting white carbon black from fly ash or slag | |
| CN102502722A (en) | Preparation method of high-purity magnesium oxide | |
| CN108190928A (en) | A kind of method of aluminous fly-ash synthesizing mesoporous nano gama-alumina | |
| AU2006337403B2 (en) | An improved process for preparation of magnesium oxide | |
| CN109437261A (en) | A kind of sheeted nanometer magnesium hydroxide raw powder's production technology | |
| CN103864086A (en) | Method of producing borax by utilizing boron-rich slag | |
| CN101786644B (en) | Sandy alumina preparation method | |
| CN103663480B (en) | A kind of preparation method of zeolite | |
| CN103303955A (en) | Production method of calcium carbonate whisker | |
| CN102115813B (en) | Comprehensive utilization method for low-grade magnesite |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20121226 Assignee: Lianyungang Beautech Superfine Co., Ltd. Assignor: Hebei University of Science and Technology Contract record no.: 2013130000019 Denomination of invention: Process for producing magnesium hydrate by removing silicon and aluminum from magnesite License type: Exclusive License Record date: 20130326 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20121226 |
|
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: Lianyungang Beautech Superfine Co., Ltd. Assignor: Hebei University of Science and Technology Contract record no.: 2013130000019 Date of cancellation: 20141028 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model |