CN1025180C - Method for extracting magnesium oxide from serpentine - Google Patents
Method for extracting magnesium oxide from serpentine Download PDFInfo
- Publication number
- CN1025180C CN1025180C CN 92101146 CN92101146A CN1025180C CN 1025180 C CN1025180 C CN 1025180C CN 92101146 CN92101146 CN 92101146 CN 92101146 A CN92101146 A CN 92101146A CN 1025180 C CN1025180 C CN 1025180C
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- CN
- China
- Prior art keywords
- serpentine
- magnesium
- magnesium oxide
- dryness
- magnesia
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- 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.)
- Expired - Fee Related
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- Manufacture And Refinement Of Metals (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention relates to a method for extracting magnesia from ophiolite. The method has the following steps: crushing the ophiolite into powder, leaching the powder by using sulphuric acid and obtaining sulfate of magnesium and other impurities after the powder is filtered and evaporated to dryness; burning the salt under the temperature of 700 to 1100 DEG C in the air, then logging by water, filtering and evaporating the salt to dryness solid substances after burning to obtain magnesium salts; finally burning the magnesium salts at a temperature of over 1114 DEG C to obtain the magnesia. The magnesia purity obtained by the method can reach over 99.94%, and the present invention has simple technology and lower production cost, and opens up a new approach for the utilization of the ophiolite and for extracting high-purity magnesia.
Description
The invention belongs to the preparation method of magnesium oxide, specifically method for extracting magnesium oxide from serpentine.
At present magnesianly produce many to be that raw material extracts magnesium oxide with seawater or magnesite, mainly to be from seawater, to extract but prepare highly purified magnesium oxide.Extracting magnesium oxide from seawater needs to make precipitation agent to remove impurity with a large amount of soda ash, and it is higher to extract magnesian purity, and the purity of used soda ash is also higher, and cost is also higher.
Magnesian content is generally more than 36% in the serpentine ore, and the serpentine resource of China is abundant, has a very wide distribution, but does not obtain due utilization, how to extract magnesium oxide and caused people's attention from serpentine.Serpentine is mainly by SiO
2(about 40%), MgO(about 38%) and Fe
2O
3(about 8%) is formed, contain a small amount of Al in addition, Cr, Ca, Mn, in 1991 the 3rd phases of oxide compound " nonmetalliferous ore ", 32～39 pages of articles that disclose " magnesium oxide is extracted in the comprehensive utilization one of chrysotile tailing from serpentine ", the magnesium oxide extraction process that this article is put down in writing is: serpentine ore is ground into Powdered, adding concentration is 30% sulfuric acid molten ore deposit leaching, generate the solubility salt of solubility magnesium salts and other impurity, use precipitator method removal of impurities then, filter the back recrystallize and go out magnesium basic carbonate, calcination gets magnesium oxide, extract magnesian key and be impurity removal process from serpentine, it is related to magnesian dna purity, the problems such as feasibility of production cost and suitability for industrialized production.The removal of impurities of above-mentioned prior art is regulated the pH value with alkaline solution and is precipitated removal of impurities.The a large amount of alkali of this impurity removal method consumption, so cost is higher.If require the magnesium oxide purity of extraction high more, then the purity of alkali is also high more, and production cost is also high more.Second problem of precipitation impurity removal method is that to separate ferrous ion fully from high-load magnesium salts be impossible, removed after above-mentioned prior art adopts the Naclo oxygenant that ferrous ion is become ferric ion for addressing this problem, but the Naclo price is very high, and filters also difficulty when separating.The 3rd problem of precipitation impurity removal method will be isolated the small amount of calcium composition from high-load magnesium salts also be the comparison difficulty.In addition, in the precipitation removal of impurities, not only bring difficulty, and the loss of extract is also bigger to filtration because ferric hydroxide colloid precipitates.Therefore, this method not only cost is higher, nor is suitable for suitability for industrialized production.
The objective of the invention is provides a kind of magnesian novel method of extracting at existing problem in the above-mentioned prior art from serpentine, this method is easy to suitability for industrialized production, and cost is lower, and the magnesium oxide purity height that is extracted.
The solution that realizes the object of the invention is as follows:
(1) the serpentine sample ore is ground into Powdered,
(2) above-mentioned breeze is heated in concentration is 10～40% sulfuric acid, it is fully dissolved, filter sulfate liquor,
(3) with above-mentioned filtrate evaporate to dryness, get solid sulfate salt,
(4) with solid sulfate salt 700～1100 ℃ of calcinations in air,
(5) with the solids water logging after the calcination, filter and remove residue promptly gets magnesium salt solution then,
(6) with above-mentioned filtrate evaporate to dryness, get the solid magnesium salts,
(7) with the solid magnesium salts 1114～1350 ℃ of calcinations in air, promptly get magnesium oxide,
Above-mentioned whole process is carried out under normal pressure.
In the calcination process of above-mentioned (4) except magnesium salts and calcium salt, other metal-salt all resolves into water-fast oxide compound, and calcium salt does not dissolve in water, has only magnesium salts water-soluble, so the solids after the calcination is removed slag with the water logging after-filtration, Impurity removal is obtained magnesium salt solution.This process is as long as calcination is abundant, and removal of impurities just relatively fully.Removal of impurities calcination temperature height helps impurity and decomposes, but consider the requirement of productivity and the situation of equipment in actual production, and the removal of impurities calcination temperature is usually in 900～1000 ℃ of scopes.
The above-mentioned solid silica that filters gained when adding the lixiviate of sour molten ore deposit can be used as filter aid material; And in the process of twice calcination all recyclable sulfuric acid.
Example: sample ore is the Lantian serpentine, and its component content (%) is:
Sio
2（40.28）、Fe
2O
3（7.9）、Al
2O
3（0.33）、Cr
2O
3（0.76）、NiO（0.98）、CaO（0.55）、MnO（0.25）、MgO（38.40）。
The serpentine sample ore is pulverized, crossed 200 mesh sieves; Get snake stone flour 50 gram, add concentration and be 100 milliliters in 25% sulfuric acid, in reflux, be heated to 110 ℃ of lixiviates 1 hour; Filter waste (silica); With the filtrate evaporate to dryness, in 1100 ℃ in retort furnace calcination count in the branch; Water logging is filtered then, again with the filtrate evaporate to dryness, in 1300 ℃ of calcinations, gets 12 and digests pure zirconia magnesium.This magnesian purity is more than 99.94%, and the foreign matter content that spectroscopic analysis gets (%) is: Cu 0.0002, Ni 0.0005, Mn 0.002, Ca 0.01, Si 0.01, Al＜0.01, Fe＜0.01.Content in this example is weight percentage.
The invention has the advantages that: 1, technology is simple, cost is low, is suitable for suitability for industrialized production, for new approach has been opened up in the utilization of serpentine; 2, only just can extract highly purified magnesia with technical grade sulfuric acid, the purity SILVER REAGENT, and also the loss of purification thing is minimum. In addition, calcination impurity-removing method of the present invention has solved the difficulty of in the past removing ferrous ion and a small amount of calcium component in chemical purification from the high-load magnesium salts.
Claims (2)
1, a kind of from serpentine method for extracting magnesium oxide,
(1) the serpentine sample ore is ground into Powdered,
(2) above-mentioned breeze is heated in concentration is 10～40% sulfuric acid, it is fully dissolved, filter sulfate liquor,
It is characterized in that
(3) with above-mentioned filtrate evaporate to dryness, get solid sulfate salt,
(4) with solid sulfate salt 700～1100 ℃ of calcinations in air,
(5) with the solids water logging after the calcination, filter and remove residue promptly gets magnesium salt solution then,
(6) with above-mentioned filtrate evaporate to dryness, get the solid magnesium salts,
(7) with the solid magnesium salts 1114～1350 ℃ of calcinations in air, promptly get magnesium oxide,
Above-mentioned whole process is carried out under normal pressure.
2, the method for claim 1 is characterized in that the calcination temperature in (4) is 900～1000 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92101146 CN1025180C (en) | 1992-02-24 | 1992-02-24 | Method for extracting magnesium oxide from serpentine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92101146 CN1025180C (en) | 1992-02-24 | 1992-02-24 | Method for extracting magnesium oxide from serpentine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1075936A CN1075936A (en) | 1993-09-08 |
| CN1025180C true CN1025180C (en) | 1994-06-29 |
Family
ID=4938981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92101146 Expired - Fee Related CN1025180C (en) | 1992-02-24 | 1992-02-24 | Method for extracting magnesium oxide from serpentine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1025180C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048647C (en) * | 1994-02-25 | 2000-01-26 | 黄军梁 | Method for prepn. of filter aid using asbestos tailing |
| CN1051748C (en) * | 1996-07-15 | 2000-04-26 | 国家建筑材料工业局地质研究所 | Preparation of ultra-light magnesium oxide using blocky shepardite |
| CN100579906C (en) * | 2007-06-05 | 2010-01-13 | 昆明贵金属研究所 | Method for treating magnesium sulfate waste liquid and coproducing active magnesium chloride |
| CN107915242A (en) * | 2017-05-30 | 2018-04-17 | 张旭 | Asbestos tailings prepare method of magnesium oxide |
-
1992
- 1992-02-24 CN CN 92101146 patent/CN1025180C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1075936A (en) | 1993-09-08 |
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