CN101259969A - Technique for preparing aluminum oxide - Google Patents
Technique for preparing aluminum oxide Download PDFInfo
- Publication number
- CN101259969A CN101259969A CNA2008100201931A CN200810020193A CN101259969A CN 101259969 A CN101259969 A CN 101259969A CN A2008100201931 A CNA2008100201931 A CN A2008100201931A CN 200810020193 A CN200810020193 A CN 200810020193A CN 101259969 A CN101259969 A CN 101259969A
- Authority
- CN
- China
- Prior art keywords
- gas
- aluminum oxide
- magnetic separation
- preparation technology
- micro mist
- 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
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a preparation process for aluminum oxide, including the following steps of: a) crushing step; b) magnetic separation crushing step; c) dissolution step; d) deposition step; and e) drying step. Compared with the prior art, the invention improves the utilization value of refining slag of an LF furnace, saves the bauxite and limestone resources and reduces the emission of carbon dioxide; moreover, the preparation process also has the advantages of energy conservation and environmental protection.
Description
Technical field
The invention belongs to the preparation technology of aluminum oxide, belonging to especially with the LF furnace refining slag is the aluminum oxide preparation technology of raw material.
Background technology
The preparation technology of aluminum oxide commonly used mixes bauxite with lime, through high-temperature calcination, and aluminium oxide extraction process behind the generation calcium aluminate, this technology is raw material with bauxite, lime, cause environmental pollution easily, be unfavorable for environmental protection, preparation technology's energy consumption is also high simultaneously.
The utility value of smelter solid waste is generally all lower, most of in the seasoning of slag field, usually do the roadbed embedding material, belong to low value-added utilization, reinforcement along with the in short supply and environmental protection policy of resource, research to metallurgical solid waste is also increasingly extensive, and the waste residue that smelter produced is the good raw material of other industry, the high utility value that has.
Summary of the invention
Technical problem to be solved by this invention provides the preparation technology of aluminum oxide a kind of environmental protection, that energy consumption is low.
The technical scheme of technical solution problem of the present invention is: a kind of preparation technology of aluminum oxide comprises following operation:
A) pulverizing process: the LF furnace refining slag is ground into the particle of granularity less than 3mm;
B) magnetic separation pulverizing process: the particle that crushes is carried out magnetic separation,, the particle of magnetic separation is crushed to the micro mist of granularity less than 0.125mm with iron class impurity in the enrichment LF furnace refining slag.
C) dissolution process: in reactor, add micro mist, weight adding concentration by micro mist is the sodium carbonate solution of 5-20%, the weight ratio 1 of micro mist and sodium carbonate solution: 6-11, be not less than 1.5 hours 70-95 ℃ of reaction, the use plate-and-frame filter press filters, and obtains the sodium aluminate solution and the insoluble precipitation of calcium carbonate of solubility;
D) precipitation operation: in sodium aluminate solution, feed the gas that is rich in carbonic acid gas, generate aluminum hydroxide precipitation and sodium carbonate solution, filter, wash with water for several times, merging filtrate;
E) drying process: will precipitate the prepared filter cake oven dry of operation, and get final product.
Described magnetic separation operation is divided into two steps: 1, low intensity magnetic separation step: magnetic cylinder Surface field intensity 800-1500 Gauss, to remove ferromagnetic iron class impurity; 2, strong magnetic magnetic step: magnetic cylinder Surface field intensity 4000-5000 Gauss, remove the iron class impurity of weak magnetic with blanking.
In the described precipitation operation, the gas that is rich in carbonic acid gas is limestone kiln furnace gas, stack gas, industrial furnace gas is a kind of or several mixed gas.
Described precipitation operation is carried out in absorption column of gas, and the processing parameter of absorption column of gas is an atmospheric operation, and the reaction times is not less than 20 minutes, and time lengthening is favourable to filtering.By the design of this technology, 1 cube of sodium aluminate solution of every processing, need gas 2000-3000 cube of carbonic acid gas volume content 10-30%.
In the precipitation operation, described washing is repeatedly washing on a small quantity, and the hot water cleaning performance is better, also can use steam condenses.
In the described drying process, carry out drying with whizzer, hot blast temperature is 500-700 ℃.
Domestic LF stove refinery practice generally adopts quickened lime and metallic aluminium powder to do the composition of refining slag, and major ingredient is calcium oxide and aluminum oxide in the formed refinery scum, and its main chemical weight item is as follows: SiO
2For 2%-7%, CaO are that 43%-57%, MgO are that 1%-3%, TFe are 1%-5%, Al
20
3Be 27%-40%, S is 0.03%-1.5%, and all the other are impurity.This slag is dissolvable in water sodium carbonate solution, form the sodium metaaluminate and the insoluble lime carbonate of solubility, sodium metaaluminate is a weakly alkaline, its solution can with carbon dioxide reaction, generate aluminum hydroxide precipitation and sodium carbonate solution, yellow soda ash uses in this technological cycle, iron class impurity is by enrichment in the LF furnace refining slag, can return sintering system and use, calcium, silicon and other element form lime carbonate and Calucium Silicate powder, are the fabulous raw material sources of cement industry.Therefore, this technology belongs to typical green chemical industry production.
The present invention compared with prior art improves the utility value of LF furnace refining slag, has saved bauxite and limestone resource, and carbonic acid gas is had the reduction of discharging effect, has energy-conservation and characteristics environmental protection.
Embodiment
Below in conjunction with embodiment the present invention is done detailed explanation.
Embodiment 1:
A) pulverizing process: earlier the pulverizing of LF furnace refining slag is ground into granularity with jaw formula fine crusher and is not more than the 3mm particle.
B) magnetic separation pulverizing process: the particle that crushes is carried out magnetic separation, earlier the magnetic cylinder surface strength is made as 800 Gausses, to sort ferromagnetism iron class impurity; Again the magnetic cylinder surface strength is made as 4000-5000 Gauss,, is ground into the micro mist that granularity is not more than 0.125mm with ball mill again to sort weak martial ethiops class class impurity.
C) dissolution process: it is 12% sodium carbonate solution that the micro mist behind the ball milling is added weight concentration, and the weight ratio of particle and sodium carbonate solution 1: 6 70 ℃ of reactions 1.5 hours, is filtered, the sodium metaaluminate and the insoluble lime carbonate of acquisition solubility;
D) precipitation operation: the precipitation operation is carried out in absorption column of gas, feeds stack gas in sodium aluminate solution, and the processing parameter of absorption column of gas is an atmospheric operation, 20 minutes reaction times, generate aluminum hydroxide precipitation and sodium carbonate solution, filter, wash with water for several times, merging filtrate;
E) drying process: will precipitate the prepared filter cake of operation and carry out drying with whizzer, 650 ℃ of hot blast temperatures, the moisture 2% behind dry materials obtains the aluminium sesquioxide of finished product.
Embodiment 2:
A) pulverizing process: earlier the pulverizing of LF furnace refining slag is ground into granularity with jaw formula fine crusher and is not more than the 3mm particle.
B) magnetic separation pulverizing process: the particle that crushes is carried out magnetic separation, earlier the magnetic cylinder surface strength is made as 1000 Gausses, to sort ferromagnetism iron class impurity; Again the magnetic cylinder surface strength is made as 4000-5000 Gauss, to sort weak martial ethiops class impurity, be ground into the micro mist that granularity is not more than 0.125mm with ball mill again, again micro mist is made as 4000-5000 Gauss magnetic separator with the magnetic cylinder surface strength and handles one time, to remove weak magnetism class impurity wherein.
C) dissolution process: it is 10% sodium carbonate solution that the micro mist behind the ball milling is added weight concentration, and the weight ratio of particle and sodium carbonate solution 1: 8 90 ℃ of reactions 1.5 hours, is filtered, the sodium metaaluminate and the insoluble lime carbonate of acquisition solubility;
D) precipitation operation: the precipitation operation is carried out in absorption column of gas, feeds the limestone kiln furnace gas in sodium aluminate solution, and the processing parameter of absorption column of gas is an atmospheric operation, 20 minutes reaction times, generate aluminum hydroxide precipitation and sodium carbonate solution, filter, wash with water for several times, merging filtrate;
E) drying process: will precipitate the prepared filter cake of operation and carry out drying with whizzer, 550 ℃ of hot blast temperatures, the moisture 2% behind dry materials obtains the aluminium sesquioxide of finished product.
Embodiment 3:
A) pulverizing process: earlier the pulverizing of LF furnace refining slag is ground into granularity with jaw formula fine crusher and is not more than the 3mm particle.
B) magnetic separation pulverizing process: the particle that crushes is carried out magnetic separation, earlier the magnetic cylinder surface strength is made as 1500 Gausses, to sort ferromagnetism iron class impurity; Again the magnetic cylinder surface strength is made as 4000-5000 Gauss, to sort weak martial ethiops class impurity, be ground into the micro mist that granularity is not more than 0.125mm with ball mill again, micro mist be made as 4000-5000 Gauss magnetic separator with the magnetic cylinder surface strength handle one time, to remove weak magnetism class impurity wherein.
C) dissolution process: it is 10% sodium carbonate solution that the micro mist behind the ball milling is added weight concentration, and the weight ratio of particle and sodium carbonate solution 1: 11 80 ℃ of reactions 1.5 hours, is filtered, the sodium metaaluminate and the insoluble lime carbonate of acquisition solubility;
D) precipitation operation: the precipitation operation is carried out in absorption column of gas, feeds industrial furnace gas in sodium aluminate solution, and the processing parameter of absorption column of gas is an atmospheric operation, 20 minutes reaction times, generate aluminum hydroxide precipitation and sodium carbonate solution, filter, wash with water for several times, merging filtrate;
E) drying process: will precipitate the prepared filter cake of operation and carry out drying with whizzer, 500 ℃ of hot blast temperatures, the moisture 2% behind dry materials obtains the aluminium sesquioxide of finished product.
The aluminum oxide that embodiment 1-3 is prepared, purity is not less than 98%.
In force, once more by the magnetic separation decon, implementation result is better with the micro mist behind 2, the 3 pairs of ball millings among the embodiment.
Claims (7)
1, a kind of preparation technology of aluminum oxide is characterized in that: comprise following operation:
A) pulverizing process: the LF furnace refining slag is ground into the particle of granularity less than 3mm;
B) magnetic separation pulverizing process: the particle that crushes is carried out magnetic separation,, the particle of magnetic separation is crushed to the micro mist of granularity less than 0.125mm with iron class impurity in the enrichment LF furnace refining slag;
C) dissolution process: in reactor, add micro mist, weight adding concentration by micro mist is the sodium carbonate solution of 5-20%, the weight ratio 1 of micro mist and sodium carbonate solution: 6-11, be not less than 1.5 hours 70-95 ℃ of reaction, the use plate-and-frame filter press filters, and obtains the sodium aluminate solution and the insoluble precipitation of calcium carbonate of solubility;
D) precipitation operation: in sodium aluminate solution, feed the gas that is rich in carbonic acid gas, generate aluminum hydroxide precipitation and sodium carbonate solution, filter, wash with water for several times, merging filtrate;
E) drying process: will precipitate the prepared filter cake oven dry of operation, and get final product.
2, the preparation technology of a kind of aluminum oxide according to claim 1 is characterized in that: described b) the magnetic separation pulverizing process is divided into two steps:
B1) low intensity magnetic separation step: magnetic cylinder Surface field intensity 800-1500 Gauss;
B2) high intensity magnetic separation step: magnetic cylinder Surface field intensity 4000-5000 Gauss;
The particle that high intensity magnetic separation is crossed is crushed to the micro mist of granularity less than 0.125mm.
3, the preparation technology of a kind of aluminum oxide according to claim 1, it is characterized in that: described d) the precipitation operation is carried out in absorption column of gas, reaction times is not less than 20 minutes, and 1 cube of sodium aluminate solution of every processing needs gas 2000-3000 cube of carbonic acid gas volume content 10-60%.
4, the preparation technology of a kind of aluminum oxide according to claim 3 is characterized in that: described d) in the precipitation operation, the gas that is rich in carbonic acid gas is limestone kiln furnace gas, stack gas, industrial furnace gas is a kind of or several mixed gas.
5, the preparation technology of a kind of aluminum oxide according to claim 3 is characterized in that: described d) in the precipitation operation, described hot wash-water is repeatedly washing on a small quantity.
6, the preparation technology of a kind of aluminum oxide according to claim 1 is characterized in that: described e) in the drying process, carry out drying with whizzer, hot blast temperature is 500-700 ℃.
7, the preparation technology of a kind of aluminum oxide according to claim 1 is characterized in that: the chemical weight item of described refinery scum is as follows: SiO
2For 2%-7%, CaO are that 43%-57%, MgO are that 1%-3%, TFe are 1%-5%, Al
20
3Be 27%-40%, S is 0.03%-1.5%, and all the other are impurity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100201931A CN101259969B (en) | 2008-03-27 | 2008-03-27 | Technique for preparing aluminum oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100201931A CN101259969B (en) | 2008-03-27 | 2008-03-27 | Technique for preparing aluminum oxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101259969A true CN101259969A (en) | 2008-09-10 |
| CN101259969B CN101259969B (en) | 2010-09-01 |
Family
ID=39960712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100201931A Active CN101259969B (en) | 2008-03-27 | 2008-03-27 | Technique for preparing aluminum oxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101259969B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102344997A (en) * | 2011-10-02 | 2012-02-08 | 北京科技大学 | High-calcium high-aluminum fluorine-free refining slags for producing high purity steel and refining method |
| CN102585557A (en) * | 2012-01-05 | 2012-07-18 | 池州凯尔特纳米科技有限公司 | Method for industrially preparing transparent filler nano calcium carbonate for agricultural polyethylene (PE) film |
| CN103937914A (en) * | 2014-04-16 | 2014-07-23 | 中钢集团武汉安全环保研究院有限公司 | Method for total resource utilization of LF furnace refining slag |
| CN107177740A (en) * | 2017-05-16 | 2017-09-19 | 河钢股份有限公司承德分公司 | A kind of method that aluminium is reclaimed from refining slag |
| CN109650419A (en) * | 2017-10-10 | 2019-04-19 | 广东科达洁能股份有限公司 | The method and system that a kind of pair of Aluminum sludge is comprehensively utilized |
-
2008
- 2008-03-27 CN CN2008100201931A patent/CN101259969B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102344997A (en) * | 2011-10-02 | 2012-02-08 | 北京科技大学 | High-calcium high-aluminum fluorine-free refining slags for producing high purity steel and refining method |
| CN102585557A (en) * | 2012-01-05 | 2012-07-18 | 池州凯尔特纳米科技有限公司 | Method for industrially preparing transparent filler nano calcium carbonate for agricultural polyethylene (PE) film |
| CN103937914A (en) * | 2014-04-16 | 2014-07-23 | 中钢集团武汉安全环保研究院有限公司 | Method for total resource utilization of LF furnace refining slag |
| CN103937914B (en) * | 2014-04-16 | 2015-09-30 | 中钢集团武汉安全环保研究院有限公司 | A kind of method of LF furnace refining slag full dose recycling |
| CN107177740A (en) * | 2017-05-16 | 2017-09-19 | 河钢股份有限公司承德分公司 | A kind of method that aluminium is reclaimed from refining slag |
| CN107177740B (en) * | 2017-05-16 | 2020-01-24 | 河钢股份有限公司承德分公司 | Method for recovering aluminum from refining slag |
| CN109650419A (en) * | 2017-10-10 | 2019-04-19 | 广东科达洁能股份有限公司 | The method and system that a kind of pair of Aluminum sludge is comprehensively utilized |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101259969B (en) | 2010-09-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104495899B (en) | A kind of carbide slag and flyash work in coordination with the method for recycling | |
| US7871583B2 (en) | Process for recovery of silica followed by alumina from coal fly ash | |
| CN101306426B (en) | Method for extracting iron washed ore from fly ash or slag | |
| CN101892394B (en) | Method and device for extracting lithium from lithium mica | |
| CN103614547B (en) | Method for separating iron, aluminum and silicon from diasporic bauxite | |
| CN100595154C (en) | Method for extracting aluminum oxide from fly ash and coproducing cement by carbide slag or cyanamide slag | |
| CN102627305B (en) | Method using alkaline process to extract alumina in coal ash | |
| CN102424412B (en) | Method of producing alumina from fly ash | |
| CN102020299B (en) | Method for producing industrial activated aluminum oxide from pulverized fuel ash | |
| CN103074456A (en) | Method for recycling iron from waste red mud in alumina production | |
| CN101125656A (en) | Method for firstly extracting silicon and secondly extracting aluminum from fly ash | |
| CN102502735B (en) | Method for producing alumina by using pulverized fuel ash | |
| CN101259969B (en) | Technique for preparing aluminum oxide | |
| CN101306826A (en) | Process for extracting metallurgy-level aluminum oxide from fly ash or slag | |
| CN110183120B (en) | Method for producing cement active admixture by using undisturbed electrolytic manganese slag and steel slag tail mud | |
| CN102502736A (en) | Method for producing alumina by using pulverized fuel ash | |
| CN109437607A (en) | A kind of preparation method of high-density sintered magnesia | |
| WO2020082528A1 (en) | Preparation method for low-cost and high-whiteness calcined talc | |
| CN101058431B (en) | Method of extracting aluminum oxide | |
| CN112095017B (en) | Method for recycling fly ash based on reduction roasting-acid leaching | |
| CN101450843B (en) | Iron and aluminum complex ore comprehensive utilization method | |
| WO2020206832A1 (en) | Method for extracting iron from high-iron red mud and directly cementing | |
| CN103408050A (en) | Method of efficient extraction of aluminum, iron, and titanium in coal gangue | |
| CN113800544B (en) | Method and system for preparing high Bai Gaochun aluminum hydroxide by utilizing solid waste | |
| CN108484174A (en) | A kind of technique using ardealite and red mud relieving haperacidity coproduction porous silicon carbide ceramic |
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 | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 243003 intellectual property department, technology center, No. 8 Hunan West Road, Yushan, Ma'anshan, Anhui Patentee after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 technology center, Hunan West Road, Ma'anshan, Anhui, 8 Patentee before: Ma'anshan Iron and Steel Co., Ltd. |
|
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 243003 8 Jiuhua Road, Yushan, Ma'anshan, Anhui Patentee after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 intellectual property department, technology center, No. 8 Hunan West Road, Yushan, Ma'anshan, Anhui Patentee before: Ma'anshan Iron and Steel Co., Ltd. |