CN101575111A - System and method for removing oxalate in sodium aluminate solution - Google Patents
System and method for removing oxalate in sodium aluminate solution Download PDFInfo
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- CN101575111A CN101575111A CNA2008100113146A CN200810011314A CN101575111A CN 101575111 A CN101575111 A CN 101575111A CN A2008100113146 A CNA2008100113146 A CN A2008100113146A CN 200810011314 A CN200810011314 A CN 200810011314A CN 101575111 A CN101575111 A CN 101575111A
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- sodium aluminate
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- aluminate solution
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Abstract
The invention discloses a system and a method for removing oxalate, in particular relates to a system and a method for removing oxalate in a sodium aluminate solution. The system for removing oxalate in the sodium aluminate solution comprises a filtering machine, a hot water tank, a filtrate tank or causticizing tank and a mother liquor tank, wherein the filtering machine filters fine seeds obtained by seed grading and adhesive liquid, the hot water tank provides hot water for the filtering machine to clean the fine seeds and the adhesive liquid, filtered filtrate is sent to the filtrate tank or causticizing tank, and separated seed precipitation mother liquor is sent to the mother liquor tank. The invention has the advantages that the hot water is adopted to clean the fine seeds of a secondary swirling underflow to dissolve sodium oxalate which is absorbed on the surfaces of the fine seeds into the hot water, and lime milk is used to causticize the concentrated filtrate and remove the oxalate accumulated in the flows so as to keep the oxalate in the flow within a certain concentration range and ensure the stable alumina production.
Description
Technical field
The present invention relates to a kind of removal system and method for oxalate, relate in particular to production field of metallurgy particularly in aluminum oxide Bayer process production process to the removal system and method for the oxalate in the Bayer process sodium aluminate solution.
Background technology
Owing to contain organism in the bauxite, in the process of carrying out alumina producing, because heat workshop section is arranged, the organism that brings in these ores is transformed into oxalate in the technological process of alumina producing Bayer process, and in whole alumina technology flow process, accumulate, when the concentration of oxalate to certain degree, just the production to aluminum oxide produces harm, make aluminum oxide exsolution red mud sedimentation difficulty, and bring problems such as seed decomposed product downgrade.
Summary of the invention
The present invention is exactly the removal system and method that a kind of sodium aluminate solution medium-height grass hydrochlorate is provided in order to solve the problems of the technologies described above, and its objective is in order to remove cumulative oxalate in the sodium aluminate solution, so that alumina producer can normally move.
For reaching the removal system that above-mentioned purpose the present invention is achieved in that a kind of sodium aluminate solution medium-height grass hydrochlorate, it is made of following structure: thin seed and attached liquid that seed grading is sent here carry out filtering filter; Provide hot water to clean the hot water tank of thin seed and attached liquid to filter; Filtrate filtered is delivered to filtrate receiver or causticizing tank; Isolating seed precipitation solution is delivered to mother liquor tank.
Described filter is a band filter.
Described band filter liquid outlet is three, front end exit, central exit and seed precipitation solution back outlet.
Contain the deliver to filtrate receiver of the low filtrate of sodium oxalate concentration after the described filtration from the front end exit of filter.
Contain the high filtrate of sodium oxalate concentration after the described filtration and deliver to causticizing tank from the central exit of filter.
A kind of removal method of sodium aluminate solution medium-height grass hydrochlorate is made of following step: thin seed and attached liquid that seed grading is sent here clean with hot water, filter after the cleaning; Classify with filtering filtrate; The thin seed that filters out is collected.
Described clean, filter and be sorted in the filter carry out.
Described filter is a band filter.
Described band filter is delivered to thin seed in the receiving tank after on the travelling belt thin seed and attached liquid being cleaned with hot water.
The front end exit of described band filter is delivered to filtrate receiver with thin seed and attached liquid with the low filtrate of hot water cleaning back concentration.
The central exit of described band filter is delivered to causticizing tank with thin seed and attached liquid with the high filtrate of hot water cleaning back concentration.
The described milk of lime that adds in causticizing tank carries out causticization to the high filtrate of concentration.
The seed precipitation solution back outlet of described band filter is delivered to mother liquor tank with isolating seed precipitation solution.
Advantage of the present invention and effect are as follows:
The present invention adopts hot water to clean the thin seed of secondary eddy flow underflow, and the sodium oxalate that is adsorbed on thin seed-coat is dissolved in the hot water.With milk of lime dense filtrate is carried out causticization, sodium oxalate enters the causticization slag and discharges flow process, thereby gets rid of cumulative oxalate in the flow process, and the oxalate in the flow process is remained in certain concentration range, guarantees the steady running of alumina producing.
Description of drawings
Fig. 1 is the structural representation of the removal system of sodium aluminate solution medium-height grass hydrochlorate of the present invention.
Among the figure: 1, filter; 2, hot water tank; 3, filtrate receiver; 4, causticizing tank; 5, mother liquor tank; 6, thin seed and attached liquid; 7, hot water; 8, thin seed; 9, lime latex dust; 10, hot water.
Embodiment
Below embodiments of the invention are described in detail in conjunction with the accompanying drawings, but protection scope of the present invention is not limit by embodiment.
The removal system of sodium aluminate solution medium-height grass hydrochlorate of the present invention as shown in Figure 1 is made of following structure: thin seed and attached liquid 6 that seed grading is sent here carry out filtering filter 1; Provide hot water 7 to clean the hot water tank 2 of thin seed and attached liquid 6 to filter 1; Filtrate filtered is delivered to filtrate receiver 3 or causticizing tank 4, and causticizing tank 4 is communicated with lime latex dust 9; Isolating seed precipitation solution is delivered to mother liquor tank 5; The thin seed 8 that filters out is collected.
Described filter is a band filter, and the band filter liquid outlet is three, front end exit, central exit and seed precipitation solution back outlet; Filter the deliver to filtrate receiver of concentration low filtrate in back from the front end exit of filter; Filter the high filtrate of back concentration and deliver to causticizing tank from the central exit of filter.
A kind of removal method of sodium aluminate solution medium-height grass hydrochlorate is made of following step: thin seed and attached liquid 6 usefulness hot water 7 that seed grading is sent here clean, and filter after the cleaning; Filtering filtrate is classified; The thin seed 8 that filters out is collected.Clean, filter and be sorted in the filter 1 and carry out; Band filter is delivered to thin seed 8 in the receiving tank after on the travelling belt thin seed and attached liquid 6 usefulness hot water 7 being cleaned.The front end exit of band filter 1 is delivered to filtrate receiver 3 with thin seed and attached liquid with the low filtrate of hot water cleaning back concentration; The central exit of band filter 1 is delivered to causticizing tank 4 with thin seed and attached liquid with the high filtrate of hot water cleaning back concentration, adds milk of lime in causticizing tank 4 the high filtrate of concentration is carried out causticization; The seed precipitation solution back outlet of band filter 1 is delivered to mother liquor tank 5 with isolating seed precipitation solution.
Sodium oxalate gets rid of that principle is based on that sodium oxalate very easily is dissolved in hot water and the characteristic that is slightly soluble in dense liquid caustic adopts hot water to clean the sodium oxalate that is adsorbed on thin seed-coat, and it is dissolved in the hot water.So the present invention adopts band filter to filter to the thin seed that seed filters operation, with hot water thin seed is cleaned simultaneously, the filtrate after washing is carried out causticization with milk of lime, thereby reaches the purpose of removing oxalate.
Wherein sodium aluminate solution is meant: after filtering solution after the stripping of bauxitic ore alumina producing mesohigh.Thin seed and attached liquid are meant: the mixed slurry of sodium aluminate solution after cooling produces crystallization after the high pressure stripping.Oxalate is mainly sodium oxalate in solution.
Claims (13)
1, a kind of removal system of sodium aluminate solution medium-height grass hydrochlorate is characterized in that it is made of following structure: thin seed and attached liquid that seed grading is sent here carry out filtering filter; Provide hot water to clean the hot water tank of thin seed and attached liquid to filter; Filtrate filtered is delivered to filtrate receiver or causticizing tank; Isolating seed precipitation solution is delivered to mother liquor tank.
2, the removal system of sodium aluminate solution medium-height grass hydrochlorate according to claim 1 is characterized in that described filter is a band filter.
3, the removal system of sodium aluminate solution medium-height grass hydrochlorate according to claim 2 is characterized in that described band filter liquid outlet is three, front end exit, central exit and seed precipitation solution back outlet.
4, the removal system of a kind of sodium aluminate solution medium-height grass hydrochlorate according to claim 1 is characterized in that containing after the described filtration the deliver to filtrate receiver of the low filtrate of sodium oxalate concentration from the front end exit of filter.
5, the removal system of a kind of sodium aluminate solution medium-height grass hydrochlorate according to claim 1 is characterized in that containing the high filtrate of sodium oxalate concentration after the described filtration delivers to causticizing tank from the central exit of filter.
6, a kind of removal method of sodium aluminate solution medium-height grass hydrochlorate is characterized in that being made of following step: thin seed and attached liquid that seed grading is sent here clean with hot water, filter after the cleaning; Classify with filtering filtrate; The thin seed that filters out is collected.
7, the removal method of sodium aluminate solution medium-height grass hydrochlorate according to claim 6, it is characterized in that described clean, filter and be sorted in the filter carry out.
8, the removal method of sodium aluminate solution medium-height grass hydrochlorate according to claim 7 is characterized in that described filter is a band filter.
9, the removal method of sodium aluminate solution medium-height grass hydrochlorate according to claim 8 is characterized in that described band filter after on the travelling belt thin seed and attached liquid being cleaned with hot water, delivers to thin seed in the receiving tank.
10, the removal method of sodium aluminate solution medium-height grass hydrochlorate according to claim 8 is characterized in that the front end exit of described band filter is delivered to filtrate receiver with thin seed and attached liquid with the low filtrate of hot water cleaning back concentration.
11, the removal method of sodium aluminate solution medium-height grass hydrochlorate according to claim 8 is characterized in that the central exit of described band filter is delivered to causticizing tank with thin seed and attached liquid with the high filtrate of hot water cleaning back concentration.
12, the removal method of sodium aluminate solution medium-height grass hydrochlorate according to claim 11 is characterized in that the described milk of lime that adds carries out causticization to the high filtrate of concentration in causticizing tank.
13, the removal method of sodium aluminate solution medium-height grass hydrochlorate according to claim 8 is characterized in that the seed precipitation solution back outlet of described band filter is delivered to mother liquor tank with isolating seed precipitation solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100113146A CN101575111B (en) | 2008-05-08 | 2008-05-08 | System and method for removing oxalate in sodium aluminate solution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100113146A CN101575111B (en) | 2008-05-08 | 2008-05-08 | System and method for removing oxalate in sodium aluminate solution |
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| CN101575111A true CN101575111A (en) | 2009-11-11 |
| CN101575111B CN101575111B (en) | 2011-04-06 |
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| CN2008100113146A Active CN101575111B (en) | 2008-05-08 | 2008-05-08 | System and method for removing oxalate in sodium aluminate solution |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092752B (en) * | 2009-12-15 | 2013-05-01 | 沈阳铝镁设计研究院有限公司 | Technology for removing oxalate in Bayer process |
| CN103342377A (en) * | 2013-07-23 | 2013-10-09 | 山东南山铝业股份有限公司 | Method for removing sodium oxalate from sodium aluminate solution through lime causticization |
| CN105480994A (en) * | 2014-09-18 | 2016-04-13 | 沈阳铝镁设计研究院有限公司 | Efficient method for enriching oxalate through washing of fine seeds |
| CN109052441A (en) * | 2018-08-31 | 2018-12-21 | 广西田东锦鑫化工有限公司 | The method for removing and system of organic matter in a kind of aluminum oxide production process |
| CN111410221A (en) * | 2020-03-26 | 2020-07-14 | 重庆市南川区先锋氧化铝有限公司 | Be applicable to crystal seed processing apparatus among sodium aluminate production technology |
| CN111573699A (en) * | 2020-05-22 | 2020-08-25 | 中国铝业股份有限公司 | Method for removing sodium oxalate in production process of aluminum oxide |
| CN112456524A (en) * | 2020-12-10 | 2021-03-09 | 沈阳铝镁设计研究院有限公司 | Method for treating fine seeds by using horizontal tilting disk filter |
| CN113955784A (en) * | 2020-07-03 | 2022-01-21 | 沈阳铝镁设计研究院有限公司 | Method for removing oxalate in one-stage decomposition process |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4443416A (en) * | 1983-04-18 | 1984-04-17 | Kaiser Aluminum & Chemical Corporation | Purification of bayer process liquors |
| US4496524A (en) * | 1984-03-08 | 1985-01-29 | Aluminum Company Of America | Process for the removal of sodium oxalate compounds from Bayer spent liquor |
| AUPP933499A0 (en) * | 1999-03-19 | 1999-04-15 | Worsley Alumina Pty Ltd | Process for the removal of oxalate and/or sulphate from bayer liquors |
| GB0405108D0 (en) * | 2004-03-06 | 2004-04-07 | Accentus Plc | Removal of sodium oxalate from a bayer liquor |
| CN201296674Y (en) * | 2008-12-03 | 2009-08-26 | 沈阳铝镁设计研究院 | Oxalate eliminating system for sodium aluminate solution |
-
2008
- 2008-05-08 CN CN2008100113146A patent/CN101575111B/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092752B (en) * | 2009-12-15 | 2013-05-01 | 沈阳铝镁设计研究院有限公司 | Technology for removing oxalate in Bayer process |
| CN103342377A (en) * | 2013-07-23 | 2013-10-09 | 山东南山铝业股份有限公司 | Method for removing sodium oxalate from sodium aluminate solution through lime causticization |
| CN103342377B (en) * | 2013-07-23 | 2015-08-05 | 山东南山铝业股份有限公司 | A kind of sodium aluminate solution lime causticization is except the method for sodium oxalate |
| CN105480994A (en) * | 2014-09-18 | 2016-04-13 | 沈阳铝镁设计研究院有限公司 | Efficient method for enriching oxalate through washing of fine seeds |
| CN105480994B (en) * | 2014-09-18 | 2017-05-10 | 沈阳铝镁设计研究院有限公司 | Efficient method for enriching oxalate through washing of fine seeds |
| CN109052441A (en) * | 2018-08-31 | 2018-12-21 | 广西田东锦鑫化工有限公司 | The method for removing and system of organic matter in a kind of aluminum oxide production process |
| CN111410221A (en) * | 2020-03-26 | 2020-07-14 | 重庆市南川区先锋氧化铝有限公司 | Be applicable to crystal seed processing apparatus among sodium aluminate production technology |
| CN111410221B (en) * | 2020-03-26 | 2022-11-08 | 重庆市九龙万博新材料科技有限公司 | Be applicable to crystal seed processing apparatus among sodium aluminate production technology |
| CN111573699A (en) * | 2020-05-22 | 2020-08-25 | 中国铝业股份有限公司 | Method for removing sodium oxalate in production process of aluminum oxide |
| CN113955784A (en) * | 2020-07-03 | 2022-01-21 | 沈阳铝镁设计研究院有限公司 | Method for removing oxalate in one-stage decomposition process |
| CN112456524A (en) * | 2020-12-10 | 2021-03-09 | 沈阳铝镁设计研究院有限公司 | Method for treating fine seeds by using horizontal tilting disk filter |
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| CN101575111B (en) | 2011-04-06 |
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Owner name: SHENYANG ALUMINUM + MAGNESIUM ENGINEERING + RESEAR Free format text: FORMER NAME: SHENYANG ALUMINIUM AND MAGNESIUM DESIGN INST. |
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Address after: 110001 Heping Street, Heping District, Liaoning, Shenyang, No. 184 Patentee after: Shenyang Aluminum & Magnesium Engineering & Research Institute Co., Ltd. Address before: 110001 Heping Street, Heping District, Liaoning, Shenyang, No. 184 Patentee before: Shenyang Aluminium and Magnesium Design Institute |