CN1092040A - Method for extracting light magnesia from asbestos tailings - Google Patents
Method for extracting light magnesia from asbestos tailings Download PDFInfo
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- CN1092040A CN1092040A CN 94101962 CN94101962A CN1092040A CN 1092040 A CN1092040 A CN 1092040A CN 94101962 CN94101962 CN 94101962 CN 94101962 A CN94101962 A CN 94101962A CN 1092040 A CN1092040 A CN 1092040A
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- gram
- asbestos tailings
- magnesium
- basic carbonate
- adlerika
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention relates to a kind of from asbestos tailings method for extracting light magnesia.Present method is asbestos tailings to be pulverized the back use the sulfuric acid lixiviate, obtains sulfate liquor.Regulate its pH value with ammoniacal liquor then, add NaClO again and precipitate removal of impurities, obtain Adlerika.Adlerika is regulated pH value to 9 back with ammoniacal liquor add bicarbonate of ammonia, be incubated crystallization down at 70-80 ℃ and go out magnesium basic carbonate,, promptly obtain light magnesium oxide through repeatedly putting into stoving oven 800-850 ℃ of calcinings down after the flushing.
Description
The invention belongs to the preparation method of magnesium oxide, particularly method for extracting light magnesia from asbestos tailings.
Present magnesium oxide is many to be raw material with seawater, salt water, magnisite or dolomite, adopts high-temperature calcination or electrolysis to produce.So obtain the magnesium oxide of higher degree, its cost is very high.Contain a large amount of magnesium oxide in the asbestos tailings, the asbestos of China are rich in mineral resources, and it is also wider to distribute, and just enlighten people naturally and extract magnesium oxide from asbestos tailings.Chinese patent CN1075036A disclose a kind of from serpentine method for extracting magnesium oxide, this method is that serpentine is pulverized back sulfuric acid lixiviate, filter evaporate to dryness and obtain magniferous vitriol, after calcination, water logging, isolate magnesium salts again, at last magnesium salts calcination under high temperature is promptly got magnesium oxide.Theoretically, can produce highly purified magnesium oxide with this method, also there are the following problems but will be used for suitability for industrialized production: 1. two of this method step calcinations are all at high temperature carried out, and top temperature reaches 1350 ℃, therefore, does not still break away from aforesaid traditional technology; And it is also higher to the requirement of calcination equipment; In suitability for industrialized production with magnesium salts 1140-1350 ℃ in air calcination be difficult to guarantee to obtain highly purified magnesium oxide because airborne water vapour and carbonic acid gas in the production environment of reality be easy to high temperature under MgO react; 3. this method adopts the removal of impurities of calcination vitriol, and its prerequisite must be that calcination is abundant, and wants calcination abundant, and its time will be very long, otherwise just can not reach said impurity-eliminating effect.Therefore, this impurity-removing method is difficult in the industrial production and implements.In addition, this method can only be produced heavy-calcined magnesia, and can not produce light magnesium oxide." nonmetalliferous ore " 1991 3 phase 32-39 page or leaf discloses method for extracting magnesium oxide from serpentine, but concrete processing parameter is not reported.
The objective of the invention is provides a kind of method for extracting light magnesia from asbestos tailings that is easy to suitability for industrialized production at existing problem in the above-mentioned prior art.
Provided by the present invention from asbestos tailings method for extracting light magnesia carry out as follows successively:
(1) asbestos tailings is ground into Powdered,
(2) above-mentioned breeze is heated in concentration is the sulfuric acid of 25-35%, it is fully dissolved, filter sulfate liquor,
(3) above-mentioned solution heating is remained on 60-70 ℃, use NH
3H
2The pH value of O regulator solution is to 7-8,
(4), add NaCLO that concentration is 11-13% or add KMnO in the ratio of 0.1-0.5 gram/(100 gram iron level) in the ratio of 1.0-2.0 milliliter/(gram iron level) according to the content of Fe in the ore
4, metallic impurity are precipitated from solution, get Adlerika after the filtration,
(5) with Adlerika NH
3H
2O regulates pH value to 9, and temperature remains on 70-80 ℃,
(6) ratio in 1.7-2.3 gram/gram ore deposit adds NH
4HCO
3The insulation crystallization generates the basic carbonate magnesium precipitate, filters the hot wash of back with temperature＞70 ℃, obtains purified magnesium basic carbonate,
(7) magnesium basic carbonate is dried the back in 800-850 ℃ of following calcination, promptly get light magnesium oxide.
Above-mentioned whole process is carried out under normal pressure.
The selection of cleaner, crystallizing agent, temperature of reaction and pH value etc. is vital in the method, if select improperly, does not then reach its intended purposes.The selected ammoniacal liquor of the present invention, bicarbonate of ammonia etc. all are technical grades, therefore provide possibility for suitability for industrialized production.Hot wash in the above-mentioned steps (6) be for improve magnesium oxide purity must be many step, the mode that washing should adopt few liquid repeatedly to wash is as far as possible answered washed twice at least.Can improve magnesian purity though improve the calcination temperature of magnesium basic carbonate, its active step-down, it is lower to look specific volume, take all factors into consideration, be best with 800-850 ℃.
The filter residue of above-mentioned steps (2) gained can be made into filtering medium after treatment; The filtrate of step (6) can obtain (NH through recrystallize
4) SO
4As chemical fertilizer, thereby reach the purpose that fully utilizes asbestos tailings.
Advantage of the present invention is: employed sulfuric acid, ammoniacal liquor and bicarbonate of ammonia etc. all are technical grades, therefore be suitable for large-scale industrial production, present method is simple in addition, less demanding to equipment, not only can reduce production costs, and the magnesium oxide purity of gained is higher, and has opened up new approach for the comprehensive utilization of asbestos tailings.
Example:
Sample ore is Lueyang, Shaanxi Province asbestos tailings, and its composition is: siO
238.4%, MgO 40.2%, AL
2O
30.32%, Fe
2O
35.92%, FeO 1.25%, and Cu 0.025%, and CaO 0.72%, and NiO 0.17%, loss on ignition 11.12%.
Asbestos tailings is crushed to the 80-100 order, gets breeze 1000g, adding concentration is 30% sulfuric acid 200ml, stirring and leaching 1.5 hours.With filtrate heating and remain on 60 ℃, add NH after the filtration
3H
2It is 7-8, wherein Mg that O makes its pH value
2Concentration be controlled at the 25-30 grams per liter.Add concentration then and be 11% NaCLO 75ml, the precipitation that generates is filtered, in the filtrate of gained, add NH
3.H
2It is 9 that O makes its pH value, and temperature remains on 75 ℃.Then add 1800 gram NH
4HCO
3The insulation crystallization goes out the basic carbonate magnesium precipitate, uses purified hot water injection for several times repeatedly the magnesium basic carbonate that leaches, and is sent into after the oven dry in the stoving oven 850 ℃ of calcination half an hour, obtains 385 gram light magnesium oxides.Analytical results is as follows: MgO 96.4%, calcination loss＜3%, CaO 0.9, hydrochloric acid insoluble substance 0.1%, muriate 0.09%, carbonate 0.15%, molysite 0.08%, manganese salt 0.001%, look specific volume 7.8, meet the requirement of China the Ministry of Chemical Industry select quality promulgated by the ministries or commissions of the Central Government fully, if carry out secondary crystal, magnesium oxide purity can reach 99%.
Claims (1)
1, a kind of from asbestos tailings method for extracting light magnesia, carry out as follows successively:
(1) asbestos tailings is ground into Powdered,
(2) above-mentioned breeze is heated in concentration is the sulfuric acid of 25-35%, it is fully dissolved, filter sulfate liquor,
It is characterized in that
(3) above-mentioned solution heating is remained on 60-70 ℃, use NH
3H
2The pH value of O regulator solution is to 7-8,
(4), add NaCLO that concentration is 11-13% or add KMnO in the ratio of 0.1-0.5 gram/(100 gram iron level) in the ratio of 1.0-2.0 milliliter/(gram iron level) according to the content of Fe in the ore
4, metallic impurity are precipitated from solution, get Adlerika after the filtration,
(5) with Adlerika NH
3H
2O regulates pH value to 9, and temperature remains on 70-80 ℃,
(6) ratio in 1.7-2.3 gram/gram ore deposit adds NH
4HCO
3The insulation crystallization generates the basic carbonate magnesium precipitate, filters the hot wash of back with temperature＞70 ℃, obtains purified magnesium basic carbonate,
(7) magnesium basic carbonate is dried the back in 800-850 ℃ of following calcination, promptly get light magnesium oxide.
Above-mentioned whole process is carried out under normal pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94101962 CN1092040A (en) | 1994-02-25 | 1994-02-25 | Method for extracting light magnesia from asbestos tailings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94101962 CN1092040A (en) | 1994-02-25 | 1994-02-25 | Method for extracting light magnesia from asbestos tailings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1092040A true CN1092040A (en) | 1994-09-14 |
Family
ID=5030445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94101962 Pending CN1092040A (en) | 1994-02-25 | 1994-02-25 | Method for extracting light magnesia from asbestos tailings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1092040A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320635A (en) * | 2011-06-16 | 2012-01-18 | 青岛奥盖克化工有限公司 | Comprehensive utilization method of waste sulfuric acid of sulfonated products |
| CN108328659A (en) * | 2018-02-23 | 2018-07-27 | 北京科技大学 | A kind of method that integrated treatment utilizes high magnesium ferronickel slag |
| CN114100809A (en) * | 2021-09-30 | 2022-03-01 | 内蒙古大中矿业股份有限公司 | Production process method of iron concentrate powder |
| CN114314618A (en) * | 2021-12-10 | 2022-04-12 | 北京石油化工学院 | Preparation method of magnesium carbonate double salt crystal, magnesium-containing amorphous carbonate and active magnesium oxide |
| CN115092945A (en) * | 2022-07-21 | 2022-09-23 | 陕西天宝矿业有限公司 | Novel efficient light magnesium oxide production process |
| CN115196657A (en) * | 2022-08-24 | 2022-10-18 | 西南科技大学 | Magnesium sulfate solution refined from asbestos tailings mixed with auxiliary agent and preparation method thereof |
-
1994
- 1994-02-25 CN CN 94101962 patent/CN1092040A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320635A (en) * | 2011-06-16 | 2012-01-18 | 青岛奥盖克化工有限公司 | Comprehensive utilization method of waste sulfuric acid of sulfonated products |
| CN108328659A (en) * | 2018-02-23 | 2018-07-27 | 北京科技大学 | A kind of method that integrated treatment utilizes high magnesium ferronickel slag |
| CN114100809A (en) * | 2021-09-30 | 2022-03-01 | 内蒙古大中矿业股份有限公司 | Production process method of iron concentrate powder |
| CN114314618A (en) * | 2021-12-10 | 2022-04-12 | 北京石油化工学院 | Preparation method of magnesium carbonate double salt crystal, magnesium-containing amorphous carbonate and active magnesium oxide |
| CN114314618B (en) * | 2021-12-10 | 2023-08-22 | 北京石油化工学院 | Magnesium carbonate double salt crystal, amorphous carbonate containing magnesium and preparation method of active magnesium oxide |
| CN115092945A (en) * | 2022-07-21 | 2022-09-23 | 陕西天宝矿业有限公司 | Novel efficient light magnesium oxide production process |
| CN115196657A (en) * | 2022-08-24 | 2022-10-18 | 西南科技大学 | Magnesium sulfate solution refined from asbestos tailings mixed with auxiliary agent and preparation method thereof |
| CN115196657B (en) * | 2022-08-24 | 2023-10-10 | 西南科技大学 | Magnesium sulfate solution refined with asbestos tailings mixed additives and preparation method thereof |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
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