CN1730417A - Method for filtering and washing raw red mud - Google Patents
Method for filtering and washing raw red mud Download PDFInfo
- Publication number
- CN1730417A CN1730417A CNA200510200397XA CN200510200397A CN1730417A CN 1730417 A CN1730417 A CN 1730417A CN A200510200397X A CNA200510200397X A CN A200510200397XA CN 200510200397 A CN200510200397 A CN 200510200397A CN 1730417 A CN1730417 A CN 1730417A
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- CN
- China
- Prior art keywords
- red mud
- washing
- filter
- thick
- filtering
- 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.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
- C01F7/066—Treatment of the separated residue
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/0015—Obtaining aluminium by wet processes
- C22B21/0023—Obtaining aluminium by wet processes from waste materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a crude red mud filtrating and washing process, which consists of loading crude red mud slip from the red mud grading procedure into horizontal band filters or flat disc type filters for filtrating and washing, wherein the distribution head on the filters divides the whole filter into a separation zone and a washing zone, loading the crude liquor obtained in the seperation zone into a desiliconisation procedure, entering the filter cakes of seperaton area into the washing zone, proceed reversal washing for two to three times, loading the washed red mud cleaning solution to a dissolving procedure, loading the washed crude red mud to sponge iron plant for reclamation of iron.
Description
Technical field:
The present invention relates to a kind of process for making alumina, be applicable to the thick filtering red mud washing of high-iron gibbsite.
Background technology:
The existing alumina producer of China is raw material with the diaspore mainly, and the minority alumina producer also uses the hydrargillite of external import.Generally, ore all grinds carefullyyer, and the raw pulp after levigate is through stripping, dilution, red-mud settlement separating, washing, and last washing settling groove underflow filters with plate-and-frame filter press or drumfilter again, filters the back red mud and is sent to red mud dump and stores up.
The geographic high-iron gibbsite in Guangxi is a kind of novel Mineral resources, contain 2 kinds of valuable minerals of aluminum oxide and iron simultaneously, and iron oxide content is greater than alumina content in the ore, from smelting technology, if single recovery any mineral wherein all are uneconomic, must ferro-aluminum reclaiming simultaneously just has high economic benefit.Also there is similar high-iron gibbsite in other countries such as Vietnam and area.
The high-iron gibbsite of this type reclaims iron again if iron scheme after adopting first aluminium reclaims aluminum oxide in the ore earlier from the red mud of aluminum oxide, be one of scheme preferably.Aluminum oxide dissolving out capability in the high-iron gibbsite is very good, finds through test, when the ore milling product fineness is 20 orders, adopts the leaching condition of low temperature, normal pressure, low alkaline concentration, and the aluminum oxide in the ore just can be dissolved out smoothly.When improving stripping alkali concn, temperature, further levigate ore, not only can not improve digesting efficiency of alumina, cause silicon mine participation chemical reaction in the ore on the contrary, cause alkaline consumption to increase, digesting efficiency of alumina reduces.
Because comparing with existing alumina producer, the grinding particle size of this ore wants much thick, red mud granularity after stripping is also thicker, if directly carry out separating, washing with subsider, thick red mud than great, settling velocity is fast, because the subsider mixing speed is slow, thick red mud can be blocked in bottom land can't discharging, causes the subsider cisco unity malfunction; Alumina content is low in this ore in addition, and the ore consumption of unit product is big, and the red mud amount of aluminum oxide output per ton is 4～5 times of existing alumina producer, reaches 4.5～5.0t/t-Al
2O
3, to high red mud amount like this, and control red mud wash water add-on on the technology again, press this condition to consider that existing subsider can not normally move because of the restriction of the liquid-solid wash water when of charging index, the new red mud New Process for Treatment of necessary employing.
Summary of the invention:
The objective of the invention is to: propose the coarse-fine red mud shunting and handle, thick red mud carries out filtration washing with horizontal table filter or horizontal belt filter, and thin red mud adopts traditional subsider to carry out filtration washing, can solve the difficult problem of red mud separating, washing.
The present invention is achieved in that from the next thick red mud slip of red mud grading operation, enter horizontal belt filter or horizontal table filter and carry out filtration washing, distributor head on the filter is divided into disengaging zone, washing section with whole filter, the solution that the disengaging zone obtains is called thick liquid, is sent to desiliconization process; The filter cake of disengaging zone enters washing section, carries out backflush; Red mud wash liquor after the washing is sent to the stripping operation, and the thick red mud after the washing is sent to the sponge ironworks, reclaims iron from red mud.
Thick filtering red mud washing procedure the key technical indexes is: thick red mud accounts for the per-cent 58～63% of red mud total amount, the filter charging contains 650～1000g/l admittedly, wash water add-on 0.5～1.0t/t-red mud, filter production capacity 200～300g/l, filter cake moisture content 15～25%, the backflush number of times is 2～3 times on the filter, the attached alkali content of washing back filter cake≤0.2%, 90～95 ℃ of wash water temperature.
Horizontal table filter or horizontal belt filter are used more on chemical industry and aluminum oxide industry, be generally used for the liquid-solid separation circuit of coarse particles material, the advantage of this filter is: (1), one-machine-multi-function, and on a filter, can finish simultaneously and separate and two～three washing process.(2), used leaching requirement is less, aluminium hydroxide per ton is with only 0.5～0.75 ton of leaching requirement.(3), filter cake moisture content is low, when filtering aluminium hydroxide, filter cake moisture content only about 8%.
Test shows, the gritty shape aluminium hydroxide of thick filtering red mud performance classes of Guangxi high-iron gibbsite, particle are thick, good permeability, and its strainability is very good, selection is handled with horizontal table filter or horizontal belt filter, has utilized the good characteristics of its strainability.The leaching requirement that this filter is used is less, and is highly beneficial to technology, is particularly conducive to the water balance of the Baeyer recycle system, helps improving seminal concentration, alleviates the burden of evaporization process, if wash with subsider, its leaching requirement reaches 2.0～4.0t/t-red mud.It is lower to filter the back filter cake moisture content, help the filter cake conveying and reduce attached alkali content in the filter cake, it is beneficial particularly red mud to be used for ironmaking, because the sponge ironworks will be carried out drying and take off the sodium processing red mud, thick red mud is moisture less, it is low to contain alkali, can reduce the burden of ironworks drying process and save and take off the sodium operation.
Although thick filtering red mud better performances is considered and can be carried a small amount of thin red mud in the thick red mud secretly, should be taken into account that when formulating technical indicator this part thin red mud can cause technical indicator to descend, the technical indicator that thick filtering red mud is formulated is rationally feasible.
The invention has the beneficial effects as follows: solved the difficult problem of the thick red mud separating, washing of high-iron gibbsite, reduced the wash water add-on, improved the comprehensive exploitation benefit of high-iron gibbsite.
Embodiment:
Embodiments of the invention: from the next thick red mud slip of red mud grading operation, the horizontal belt filter that advances this operation carries out filtration washing, distributor head on the filter is divided into disengaging zone, washing section with whole filter, and wherein washing section is divided into a Xi Qu again, two Xi Qu, three wash the district; The solution that the disengaging zone obtains is called thick liquid, is sent to desiliconization process; The filter cake of disengaging zone enters washing section, carries out backflush three times; Red mud wash liquor after the washing is sent to the stripping operation, and the thick red mud after the washing is sent to the sponge ironworks with automobile, reclaims iron from red mud.
Thick filtering red mud washing procedure the key technical indexes is: thick red mud accounts for the per-cent 58～63% of red mud total amount, the filter charging contains 750～950g/l admittedly, wash water add-on 0.8t/t-red mud, filter production capacity 200～300g/l, filter cake moisture content 20%, the backflush number of times is 3 times on the filter, the attached alkali content of washing back filter cake≤0.2%, 90～95 ℃ of wash water temperature.
Claims (2)
1. thick filtering red mud washing methods, it is characterized in that: from the next thick red mud slip of red mud grading operation, enter horizontal belt filter or horizontal table filter and carry out filtration washing, distributor head on the filter is divided into disengaging zone, washing section with whole filter, the solution that the disengaging zone obtains is called thick liquid, is sent to desiliconization process; The filter cake of disengaging zone enters washing section, carries out backflush; Red mud wash liquor after the washing is sent to the stripping operation, and the thick red mud after the washing is sent to the sponge ironworks, reclaims iron from red mud.
2. thick filtering red mud washing methods according to claim 1, it is characterized in that: thick filtering red mud washing procedure the key technical indexes is: thick red mud accounts for the per-cent 58～63% of red mud total amount, the filter charging contains 650～1000g/l admittedly, wash water add-on 0.5～1.0t/t-red mud, filter production capacity 200～300g/l, filter cake moisture content 15～25%, the backflush number of times is 2～3 times on the filter, the attached alkali content of washing back filter cake≤0.2%, 90～95 ℃ of wash water temperature.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200510200397XA CN1730417A (en) | 2005-07-18 | 2005-07-18 | Method for filtering and washing raw red mud |
| PCT/CN2006/001741 WO2007009375A1 (en) | 2005-07-18 | 2006-07-18 | Method for filtering and washing crude red mud |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200510200397XA CN1730417A (en) | 2005-07-18 | 2005-07-18 | Method for filtering and washing raw red mud |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1730417A true CN1730417A (en) | 2006-02-08 |
Family
ID=35962845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200510200397XA Pending CN1730417A (en) | 2005-07-18 | 2005-07-18 | Method for filtering and washing raw red mud |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1730417A (en) |
| WO (1) | WO2007009375A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109692517A (en) * | 2019-01-28 | 2019-04-30 | 云南文山铝业有限公司 | Primary wash liquor recovery system and recovery method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110171810A (en) * | 2019-04-08 | 2019-08-27 | 山东鲁北企业集团总公司 | A kind of washing methods of ferric phosphate slurry |
| CN114349032B (en) * | 2022-02-22 | 2023-09-19 | 淄博坤厚新材料科技有限公司 | Preparation method of alumina |
| CN116425183A (en) * | 2023-04-07 | 2023-07-14 | 湖南省庭宇环保科技发展有限公司 | Alumina production method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53108017A (en) * | 1977-03-02 | 1978-09-20 | Hitachi Zosen Corp | Utilizing method for red mud waste in blast furnace |
| CN1075747C (en) * | 1993-08-14 | 2001-12-05 | 赣州有色冶金研究所 | Method for recovering iron ore from stripping waste residue of bauxite |
| FR2785895B1 (en) * | 1998-11-16 | 2001-01-19 | Pechiney Aluminium | PROCESS FOR PURIFYING SODIUM ALUMINATE LIQUORS CONTAINING SODIUM OXALATE FOR INCREASING THE QUANTITY OF ALUMINUM HYDRATE PRODUCED |
| ATE237558T1 (en) * | 1999-10-19 | 2003-05-15 | Albemarle Corp | METHOD FOR PRODUCING ALUMINUM HYDROXIDE WITH IMPROVED WHITE COLOR |
| CN1219702C (en) * | 2001-11-10 | 2005-09-21 | 中国长城铝业公司 | Red clay separating method for producing alumina by sintering process |
-
2005
- 2005-07-18 CN CNA200510200397XA patent/CN1730417A/en active Pending
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2006
- 2006-07-18 WO PCT/CN2006/001741 patent/WO2007009375A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109692517A (en) * | 2019-01-28 | 2019-04-30 | 云南文山铝业有限公司 | Primary wash liquor recovery system and recovery method |
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| Publication number | Publication date |
|---|---|
| WO2007009375A1 (en) | 2007-01-25 |
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