CN102531415B - Novel process for physically purifying low-grade amorphous magnesite-magnesium oxide - Google Patents
Novel process for physically purifying low-grade amorphous magnesite-magnesium oxide Download PDFInfo
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- CN102531415B CN102531415B CN 201110386678 CN201110386678A CN102531415B CN 102531415 B CN102531415 B CN 102531415B CN 201110386678 CN201110386678 CN 201110386678 CN 201110386678 A CN201110386678 A CN 201110386678A CN 102531415 B CN102531415 B CN 102531415B
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- magnesite
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Abstract
The invention relates to a process for physically purifying low-grade amorphous magnesite-magnesium oxide, which is characterized by utilizing amorphous magnesite as raw materials and preparing high-purity magnesium oxide through sintering, natural cooling, screening for primary selection, milling through grinding wheels and air classification for secondary selection. Physicochemical indexes of the selected high-purity light-calcined magnesium oxide are that: by weight, the content of MgO is 98% (+/-0.25), the content of SiO2 reduces to 0.28-0.4%, the content of CaO is 0.4-1.0%, and the content of Fe2O3 is 0.3-0.5%. The novel process uses cheap raw materials which can be obtained easily, is simple in device, reasonable in technological process, free of pollution and easy to operate, and can produce high-purity light-calcined magnesium oxide of MS98 grade. The high-purity light-calcined magnesium oxide is high in grade and good in quality.
Description
Technical field
The present invention relates to giobertite technique of preparing field, particularly a kind of low-grade amorphousness magnesite-magnesium oxide physical purification technology.
Background technology
At present, industry such as metallurgy, electronics, chemical industry constantly increase the demand of high purity, high-density magnesia, and the resource of magnesite reduces day by day, therefore improve high-purity magnesium oxide sort grade and productive rate has become current main problem.
China mainly is to adopt flotation to the purification of magnesite at present, flotation purification magnesite exists the technical process complexity, invest shortcomings such as big, and maybe can not separate the impurity separation difficulty such as silicon-dioxide, ferric oxide and calcium oxide of depositing mutually with class matter in rhombspar, the calcite; The chemical mineral processing of employing method is also arranged, but there is complex technical process in this method, processing parameter is difficult to shortcomings such as control and cost height; The light-burned physical purification method of employing is also arranged, and the step of this simple purification magnesia powder method is: at first use MgO 〉=47%, SiO after sorting
2≤ 0.5% higher-grade raw ore, general requirement raw ore particle diameter is 100-150mm, go into the klining knot, its sintering temperature is generally about 800 ℃-900 ℃, product behind the sintering is after the preceding place of kiln naturally cools to normal temperature, and heating back magnesite decomposes, and uses the cage that rolls less than 1mm to sieve, sieve out the oversize of 20-30% and handle as time mouth or mine tailing, wherein the MgO association of most of impurity and 50-70% coexistence is eliminated; And the minus mesh of 70-80% is pulverized through general grinding attachment, as minus mesh being crushed to-325 orders with Raymond mill as the finished product; General grinding attachment has medium or directly puts on by on the comminuting matter with abrasive power as ball milling, Raymond mill etc., and the surging force of generation is high-intensity, and " good and the bad " is regardless of, and is forced in the lump pulverize, for gravity treatment has increased difficulty.This minus mesh contains bright alkali (not decomposing fully) 3-5%, SiO
2,CaO, Fe
2O
3Reach about 3% Deng the impurity resultant, especially SiO
2Content account between the 0.8-1.5%, MgO content is between 96-97.2%, can only provide middle-grade raw material for the high-purity product below 97 grades of rusting, amorphousness (phanerocrystalline-adiagnostic) ore deposit accounts for 40% in the magnesite total reserves of Liaoning, the main component of its amorphousness magnesite n – clystalline magnesite is more than 45% for MgO content, secondly SiO
21% ~ 2%, other are CaO, Al
2O
3, Fe
2O
3All less than 1%.CO
2About about 50%, often contain combinations such as micro-Mn, Cu, K, Na, S, P.Amorphousness is gel-like texture, small, the compact mass structure of crystallization, and its critical defect is SiO
2The content height, and be rich poly-attitude; At present, still not having the light calcined magnesia that satisfies large-scale production MS98 level highly-purity magnesite comes out.
Summary of the inventionThe object of the present invention is to provide the high low-grade amorphousness magnesite-magnesium oxide physical purification technology of product purity of a kind of resource utilization height, purification.
The objective of the invention is to realize by following technical proposals:
Low-grade amorphousness magnesite of the present invention-magnesium oxide physical purification technology, it is characterized in that with amorphousness magnesite be raw material, by sintering, naturally cooling, screening primary election, emery wheel mill, the gravity treatment of air classification secondary makes high-purity magnesium oxide, comprises following process steps:
(1) sintering: the amorphousness raw magnesite that will contain the above 100～150mm particle diameter of MgO45% adds in the shaft furnace, 1000 ℃～1100 ℃ sintering temperatures 4 hours, obtains the light calcined magnesia batch mixing;
(2) cooling: naturally cool to normal temperature;
(3) screening: select for use the 3mm aperture to roll cage and sieve primary election, its oversize accounts for 10% as mine tailing;
(4) mill: 90% the screen undersize of accounting for after will sieving is sent into the emery wheel runner milling and is once milled, and is ground to-200～-250 orders;
(5) coarse fraction after once milling is sent into the emery wheel runner milling and is carried out secondary and mill, and is ground to-200～-250 orders;
(6) air classification :-200～-250 order mineral fines after employing vane type air classifier is once milled to the emery wheel runner milling and secondary is milled carry out secondary gravity treatment classification, the fine fraction product feeds cyclone scrubber and carries out powder, gas separation, and coarse fraction was collected by the deposition railway carriage or compartment as mine tailing after secondary was milled;
(7)-200～-250 order mineral fines are entered under distinguished and admirable drive in the cyclone scrubber under the deposition, separate with wind or gas, gas emptying or recycle after sack cleaner purifies,-200～-250 order mineral fines that cyclone scrubber is collected are as the high-purity light calcined magnesia of end product; sort the high-purity light calcined magnesia physical and chemical index in back: MgO content is 98 ± 0.25%, SiO
2Be down to 0.28～0.4%, CaO and be 0.7～1.0%, Fe
2O
3Be 0.3～0.5%.
With-200～-250 purpose light calcined magnesias that described cyclone scrubber is collected, send into Raymond machine and be finely ground to-325 orders, namely can be used as and heavily burn the high-purity magnesium oxide raw material.
Processing method physical and chemical index of the present invention is estimated for 248 pages according to national standard (GB/ 2273-1998) [the refractory materials standard compilation] third edition first volume.
Compared with prior art, advantage of the present invention is:
1) former technology need use for the ore deposit raw material to contain MgO 〉=47%, SiO after sorting
2≤ 0.5% higher-grade raw magnesite, and of the present invention give the ore deposit raw material only need the above low-grade amorphousness magnesite of MgO 〉=45% can, the raw material nongraded system, can also select discarded magnisite for use is raw material;
2) light calcined magnesia of former technology after to sintering adopts general grinding attachment, as ball milling, Raymond mills etc. have medium or directly apply pressure to by on the comminuting matter with mill power, the surging force that produces is high-intensity, light calcined magnesia batch mixing " good and the bad " behind the mill is regardless of like this, be forced in the lump pulverize, for gravity treatment has increased difficulty, and the light calcined magnesia batch mixing of the present invention after adopting the emery wheel runner milling to sintering carries out once milling with two, its emery wheel runner milling sand roller rotates milling of producing, grinding force is low intensive relatively, at after light-burned activity is arranged, loose frangible magnesium oxide particle, milling easily namely is ground into the following fine powder ore deposit of-200 orders, and the stronger SiO that is wrapped up by MgO of hardness
2Particle is stripped from out, and the power of milling of its emery wheel runner milling sand roller has but kept SiO when pulverizing destruction MgO particle
2Granule makes object and impurity in postorder selection by winnowing (secondary gravity treatment), and thick, subfractionation is fully sorted out.
Raw material of the present invention cheaply is easy to get, and equipment is simple, and technical process is reasonable, and is pollution-free, easy to operate, and high-purity light calcined magnesia is of high grade, and quality is good, can produce the high-purity light calcined magnesia of MS98 level.
Description of drawings
Fig. 1 is former magnesite-magnesium oxide physical purification technology.
Fig. 2 is the low-grade amorphousness magnesite of the present invention-magnesium oxide physical purification technology.
Embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.
As shown in Figure 2, following examples with feed composition content are:
MgO SiO
2 CaO Fe
2 O
3
45-47% ≤0.5% 0.4-1.0%、0.3-0.5%
Embodiment 1
Be raw material with amorphousness magnesite, by sintering, naturally cooling, screening primary election, emery wheel mill, the gravity treatment of air classification secondary makes high-purity magnesium oxide, comprises following process steps:
(1) sintering: the amorphousness raw magnesite that will contain the above 100～150mm particle diameter of MgO45% adds in the shaft furnace, 1050 ℃～1100 ℃ sintering temperatures 4 hours, obtains the light calcined magnesia batch mixing;
(2) cooling: naturally cool to normal temperature;
(3) screening: select for use the 3mm aperture to roll cage and sieve primary election, its oversize accounts for 10% as mine tailing;
(4) mill: 90% the screen undersize of accounting for after will sieving is sent into the emery wheel runner milling and is once milled, and is ground to-200～-250 orders; Generally once mill yield 60%～70%;
(5) back 30%～40% the coarse fraction of once milling is sent into the emery wheel runner milling and is carried out secondary and mill, and is ground to-200～-250 orders; Secondary is milled yield also 60%～70%; Advance secondary through the emery wheel runner milling and mill, its total recovery can be 85～90%;
(6) air classification :-200～-250 order mineral fines after employing vane type air classifier is once milled to the emery wheel runner milling and secondary is milled carry out secondary gravity treatment classification, the fine fraction product feeds cyclone scrubber and carries out powder, gas separation, and coarse fraction was collected by the deposition railway carriage or compartment as mine tailing after secondary was milled;
(7)-200～-250 order mineral fines are entered under distinguished and admirable drive in the cyclone scrubber under the deposition, separate with wind or gas, gas emptying or recycle after sack cleaner purifies,-200～-250 order mineral fines that cyclone scrubber is collected are as the high-purity light calcined magnesia of end product; sort the high-purity light calcined magnesia physical and chemical index in back: MgO content is 98 ± 0.25%, SiO
2Be down to 0.28～0.4%, CaO and be 0.7～1.0%, Fe
2O
3Be 0.3～0.5%.
Embodiment 2
Comprise following process steps:
(1) sintering: the amorphousness raw magnesite that will contain the above 100～150mm particle diameter of MgO45% adds in the shaft furnace, 1050 ℃ of sintering temperatures 4 hours, obtains the light calcined magnesia batch mixing;
(2) cooling: naturally cool to normal temperature;
(3) screening: select for use the 3mm aperture to roll cage and sieve, its oversize accounts for 10% as mine tailing;
(4) mill: 90% the screen undersize of accounting for after will sieving is sent into the emery wheel runner milling and is once milled, and is ground to-200 orders;
(5) back 30%～40% the coarse fraction of once milling is sent into the emery wheel runner milling and is carried out secondary and mill, and is ground to-200 orders; Advance secondary through the emery wheel runner milling and mill, its total recovery can be 85～90%;
(6) air classification :-200 order mineral fines after employing vane type air classifier is once milled to the emery wheel runner milling and secondary is milled carry out secondary gravity treatment classification, the fine fraction product feeds cyclone scrubber and carries out powder, gas separation, and coarse fraction was collected by the deposition railway carriage or compartment as mine tailing after secondary was milled;
(7)-200 order mineral fines are entered under distinguished and admirable drive in the cyclone scrubber under the deposition, separate with wind or gas, gas purifies the back emptying or recycles through sack cleaner, and-200 order mineral fines of cyclone scrubber collection are as the high-purity light calcined magnesia of end product.
It sorts back light calcined magnesia physical and chemical index such as following table:
The present invention sorts back high-purity light calcined magnesia physical and chemical index component concentration (weight %)
| MgO | SiO 2 | CaO | Fe 2 O 3 | Al 2 O 3 |
| 98.14 | 0.39 | 0.9 | 0.44 | 0.13 |
Embodiment 3
(1) sintering: the amorphousness raw magnesite that will contain the above 100～150mm particle diameter of MgO45% adds in the shaft furnace, 1100 ℃ of sintering temperatures 4 hours, obtains the light calcined magnesia batch mixing;
(2) cooling: naturally cool to normal temperature;
(3) screening: select for use the 3mm aperture to roll cage and sieve primary election, its oversize accounts for 10% as mine tailing;
(4) mill: 90% the screen undersize of accounting for after will sieving is sent into the emery wheel runner milling and is once milled, and is ground to-250 orders;
(5) back 30%～40% the coarse fraction of once milling is sent into the emery wheel runner milling and is carried out secondary and mill, and is ground to-250 orders; Advance secondary through the emery wheel runner milling and mill, its total recovery can be 85～90%;
(6) air classification :-250 order mineral fines after employing vane type air classifier is once milled to the emery wheel runner milling and secondary is milled carry out secondary gravity treatment classification, the fine fraction product feeds cyclone scrubber and carries out powder, gas separation, and coarse fraction was collected by the deposition railway carriage or compartment as mine tailing after secondary was milled;
(7)-250 order mineral fines are entered under distinguished and admirable drive in the cyclone scrubber under the deposition, separate with wind or gas, gas purifies the back emptying or recycles through sack cleaner, and-250 order mineral fines of cyclone scrubber collection are as the high-purity light calcined magnesia of end product.
The present invention sorts back high-purity light calcined magnesia physical and chemical index component concentration (weight %)
| MgO | SiO 2 | CaO | Fe 2 O 3 | Al 2 O 3 |
| 98.25 | 0.28 | 0.90 | 0.44 | 0.13 |
If with-200 orders or-250 purpose light calcined magnesias that described cyclone scrubber is collected, send into Raymond machine and be finely ground to-325 orders, namely can be used as high-purity heavy burned magnesium oxide raw material.
Claims (4)
1. low-grade amorphousness magnesite-magnesium oxide physical purification technology, it is characterized in that with amorphousness magnesite be raw material, by sintering, naturally cooling, screening primary election, emery wheel mill, the gravity treatment of air classification secondary makes high-purity magnesium oxide, comprises following process steps:
(1) sintering: the amorphousness raw magnesite that will contain the above 100～150mm particle diameter of MgO45% adds in the shaft furnace, 1000 ℃～1100 ℃ sintering temperatures 4 hours, obtains the light calcined magnesia batch mixing;
(2) cooling: naturally cool to normal temperature;
(3) screening: select for use the 3mm aperture to roll cage and sieve primary election, its oversize accounts for 10% as mine tailing;
(4) mill: 90% the screen undersize of accounting for after will sieving is sent into the emery wheel runner milling and is once milled, and is ground to-200～-250 orders;
(5) coarse fraction after once milling is sent into the emery wheel runner milling and is carried out secondary and mill, and is ground to-200～-250 orders;
(6) air classification :-200～-250 order mineral fines after employing vane type air classifier is once milled to the emery wheel runner milling and secondary is milled carry out secondary gravity treatment classification, and the fine fraction product feeds cyclone scrubber and carries out powder, gas separation,
Coarse fraction was collected by the deposition railway carriage or compartment as mine tailing after secondary was milled;
(7)-200～-250 order mineral fines are entered under distinguished and admirable drive in the cyclone scrubber under the deposition, separate with wind or gas, gas emptying or recycle after sack cleaner purifies,-200～-250 order mineral fines that cyclone scrubber is collected are as the high-purity light calcined magnesia of end product; sort the high-purity light calcined magnesia physical and chemical index in back: MgO content is 98 ± 0.25%, SiO
2Be down to 0.28～0.4%, CaO and be 0.7～1.0%, Fe
2O
3Be 0.3～0.5%.
2. low-grade amorphousness magnesite according to claim 1-magnesium oxide physical purification technology, it is characterized in that-200～-250 purpose light calcined magnesias with described cyclone scrubber collection, send into Raymond machine and be finely ground to-325mm, as heavily burning the high-purity magnesium oxide raw material.
3. low-grade amorphousness magnesite according to claim 1-magnesium oxide physical purification technology is characterized in that comprising following process steps:
(1) sintering: the amorphousness raw magnesite that will contain the above 100～150mm particle diameter of MgO45% adds in the shaft furnace, 1050 ℃～1100 ℃ sintering temperatures 4 hours, obtains the light calcined magnesia batch mixing;
(2) cooling: naturally cool to normal temperature;
(3) screening: select for use the 3mm aperture to roll cage and sieve primary election, its oversize accounts for 10% as mine tailing;
(4) mill: 90% the screen undersize of accounting for after will sieving is sent into the emery wheel runner milling and is once milled, and is ground to-200～-250 orders;
(5) coarse fraction after once milling is sent into the emery wheel runner milling and is carried out secondary and mill, and is ground to-200～-250 orders;
(6) air classification :-200～-250 order mineral fines after employing vane type air classifier is once milled to the emery wheel runner milling and secondary is milled carry out secondary gravity treatment classification, and the fine fraction product feeds cyclone scrubber and carries out powder, gas separation,
Coarse fraction was collected by the deposition railway carriage or compartment as mine tailing after secondary was milled;
(7)-200～-250 order mineral fines are entered under distinguished and admirable drive in the cyclone scrubber under the deposition, separate with wind or gas, gas emptying or recycle after sack cleaner purifies,-200～-250 order mineral fines that cyclone scrubber is collected are as the high-purity light calcined magnesia of end product; sort the high-purity light calcined magnesia physical and chemical index in back: MgO content is 98 ± 0.25%, SiO
2Be down to 0.28～0.4%, CaO and be 0.7～1.0%, Fe
2O
3Be 0.3～0.5%.
4. low-grade amorphousness magnesite according to claim 3-magnesium oxide physical purification technology is characterized in that comprising following process steps:
(1) sintering: the amorphousness raw magnesite that will contain the above 100～150mm particle diameter of MgO45% adds in the shaft furnace, 1100 ℃ of sintering temperatures 4 hours, obtains the light calcined magnesia batch mixing;
(2) cooling: naturally cool to normal temperature;
(3) screening: select for use the 3mm aperture to roll cage and sieve primary election, its oversize accounts for 10% as mine tailing;
(4) mill: 90% the screen undersize of accounting for after will sieving is sent into the emery wheel runner milling and is once milled, and is ground to-250 orders;
(5) coarse fraction after once milling is sent into the emery wheel runner milling and is carried out secondary and mill, and is ground to-250 orders;
(6) air classification :-250 order mineral fines after employing vane type air classifier is once milled to the emery wheel runner milling and secondary is milled carry out secondary gravity treatment classification, the fine fraction product feeds cyclone scrubber and carries out powder, gas separation, and coarse fraction was collected by the deposition railway carriage or compartment as mine tailing after secondary was milled;
(7)-250 order mineral fines are entered under distinguished and admirable drive in the cyclone scrubber under the deposition, separate with wind or gas, gas emptying or recycle after sack cleaner purifies,-250 order mineral fines that cyclone scrubber is collected are as the high-purity light calcined magnesia of end product; sort the high-purity light calcined magnesia physical and chemical index in back: MgO content is 98.25%, SiO
2Be down to 0.28%, CaO and be 0.9%, Fe
2O
3Be 0.44%.
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|---|---|---|---|
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| CN102838345B (en) * | 2012-09-25 | 2014-03-26 | 上海同化新材料科技有限公司 | Preparation method of magnesium oxide for insulated cable knob insulator, magnesium oxide and application of magnesium oxide |
| CN107857489B (en) * | 2017-12-15 | 2020-06-02 | 宋重本 | Process for removing silicon by activating, roasting and gravity separation of magnesite |
| CN111348845B (en) * | 2020-03-13 | 2021-12-31 | 海城市光大高纯镁砂有限责任公司 | Preparation method for preparing high-grade high-purity magnesite by using magnesium sulfate as binding agent |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1749193A (en) * | 2005-08-03 | 2006-03-22 | 东北大学 | Method for producing soft firing magnesium oxide using tunnel kiln to calcine magnesite |
| CN1986846A (en) * | 2006-12-20 | 2007-06-27 | 辽宁科技大学 | Magnesite hot enriching process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03247508A (en) * | 1990-02-22 | 1991-11-05 | Sobuekuree Kk | Production of light-burned magnesite |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1749193A (en) * | 2005-08-03 | 2006-03-22 | 东北大学 | Method for producing soft firing magnesium oxide using tunnel kiln to calcine magnesite |
| CN1986846A (en) * | 2006-12-20 | 2007-06-27 | 辽宁科技大学 | Magnesite hot enriching process |
Non-Patent Citations (3)
| Title |
|---|
| JP平3－247508A 1991.11.05 |
| 余学飞.大规模利用低品位菱镁矿的可行性研究.《中国建材报》.2010,第1、2页. |
| 大规模利用低品位菱镁矿的可行性研究;余学飞;《中国建材报》;20100211;第1、2页 * |
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