CN1868879A - Red mud separating washing technology with self circulation and its device - Google Patents
Red mud separating washing technology with self circulation and its device Download PDFInfo
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- CN1868879A CN1868879A CN 200510200293 CN200510200293A CN1868879A CN 1868879 A CN1868879 A CN 1868879A CN 200510200293 CN200510200293 CN 200510200293 CN 200510200293 A CN200510200293 A CN 200510200293A CN 1868879 A CN1868879 A CN 1868879A
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Abstract
A red mud washing-separating process and apparatus with self circulation features that a solution outlet is additionally made at the upper-middle part of each separating settling bath and each washing settling bath, each settling bath has a circulating pump at its bottom for circulating 10-60% of the solution in the bath itself, all the washing settling baths are cascaded for serially transferring te bottom flow from this one to next one, and final red mud is filtered.
Description
Technical field:
The present invention relates to the red mud separating washing technology and the device thereof of alumina producing.
Background technology:
The red-mud settlement separating, washing is an important production process in the aluminum oxide production process, and purpose is that useful components such as aluminum oxide in the red mud underflow attached liquid and alkali are reclaimed the influent stream journey, and the red mud after the washing requires its attached alkali content Na
2The dried red mud of O≤5kg/t-is sent to red mud dump and stores up.
The red mud separating, washing flow process of existing alumina producer is: the slip that the stripping operation is come advances separation tank, and the separation tank underflow advances washing settling groove and carries out backflush 3～4 times, and washing back red mud goes the filtering red mud operation or send red mud dump.Used red mud wash water is from hot water station or filtering red mud operation.
Need to add a large amount of wash waters in the laterite washing process, the wash water add-on in the actual production is generally the dried red mud of 3.5～4.5t/t-.A large amount of wash waters adds to production and brings two unfavorable factors: at first be with the alkali of production system and alumina concentration towards rare, cause the aluminum oxide output capacity of seminal fluid to reduce, production system is moved under lower concentration; Next is to cause the water yield in the production cycle system to expand, and has broken the water balance of system, and the burden of evaporization process is increased, and steam consumption increases.The Bayer process alumina producer that is 900kt/a with an annual capacity is an example, steams the water yield liquor evaporating plant year and is approximately 3000kt/a, consumes surplus the live steam 100 ten thousand tons/year, and steam is worth more than 6,000 ten thousand yuan.
From process for making alumina, red mud wash water add-on is few more good more.Can alleviate the burden of evaporization process like this, save steam consumption, can improve the alumina concentration and the alkali concn of seminal fluid simultaneously.
For the comprehensive utilization of low-grade bauxite, because ore grade is low, alumina content is little in the ore, so red mud amount is big especially, as producing aluminum oxide with the Guangxi high-iron bauxite, the red mud amount of its product per ton reaches 3～4 tons, than present alumina producer 0.9～1.3t/t-AL
2O
3Red mud amount exceeds more than 2 times, if red mud treatment process routinely, the red mud separating, washing operation is difficult to pass through, red mud wash water add-on is big, production system is moved under very low concentration, and liquor evaporating plant also can be built very hugely, is infeasible economically, if reduce the wash water add-on significantly, then subsider does not reach the sedimentation washing effect because of the charging liquid-solid ratio is too low.
The present invention is primarily aimed at when handling low-grade bauxite, and its red mud amount is big, and red mud separating, washing operation operation difficulty, and a kind of new laterite washing technology and the device thereof that propose are to solve the difficult problem that the wash water add-on is big, subsider can not normally move.Simultaneously, this technology is applicable to that also the alumina producer that uses higher-grade bauxite for reducing red mud wash water add-on, optimizes the technological improvement that full factory technical indicator carries out.
Summary of the invention:
The objective of the invention is to: propose a kind of red mud separating washing technology and device thereof with self-circulation, existing red mud separating washing technology flow process is improved, can reduce red mud wash water add-on significantly, when particularly handling low-grade bauxite, bigger in the unit product red mud amount, the red-mud settlement process operations can satisfactorily resolve the laterite washing problem than under the difficult condition, and the alkali concn that makes whole process is controlled in the scope of reasonable economy, and systematic technical indicator is optimized.
The red mud separating washing technology of band self-circulation of the present invention is achieved in that on the basis of the red mud separating, washing of routine, increase a taphole respectively at separation tank and washing settling groove, respectively increase a pump in that bottom land is other corresponding, with pipeline this taphole and pump are coupled together, the solution that this taphole is discharged is sent into this groove again, form self-cycle structure, make each groove that 10%～60% solution participation self-circulation be arranged, to increase the charging liquid-solid ratio of each groove, the wash water add-on of minimizing process is guaranteed the effect of settling that separates, washs.The underflow of last washing settling groove by pipe-line transportation to filtering red mud or stockyard.
During work, at first, the stripping slurry that comes from the stripping operation enters separation tank, and the other recycle pump of its bottom land makes part solution in the circulation of this groove, with control charging liquid-solid ratio; Secondly, the underflow of separation tank is sent to laundry and is washed subsider, and every washing settling groove groove is equipped with recycle pump, by the charging liquid-solid ratio of internal circulating load control washing settling groove.Simultaneously, the overflow of separation tank pumping controlled filter operation.Then, the underflow of every separation tank is all carried downwards, send filtering red mud or red mud dump until the underflow of last washing settling groove; Meanwhile, every washing settling groove all upwards a subsider carry out reverse washing lotion and carry, promptly carry out 5～7 times backflush.
The device that is used for the red mud separating washing technology of band self-circulation of the present invention is to constitute like this: it comprises separation tank (7) and washing settling groove (8), washing settling groove (8) is at least 5, on separation tank (7) and every washing settling groove (8), all be respectively equipped with overflow outlet (3), taphole (9) and underflow outlet (10), locate all to be respectively equipped with a pump (1) in each overflow outlet (3), and each overflow outlet (3) all links to each other with pump (1) by a pipeline (2) respectively, locate all to be respectively equipped with a pump (12) at each taphole (9), and each taphole (9) links to each other with the import of pump (12) by a pipeline respectively, in the outlet of each pump (12), all be connected with the circulating line that backflows (6) respectively, and the circulating line that backflows (6) of separation tank (7) is communicated with this separation tank (7) from the top with stripping slurry transport pipe (4), and the circulating line that backflows (6) that connects in pump (12) outlet of every washing settling groove (8) is all coupled logical from the top of this washing settling groove (8), locate all to be provided with a pump (11) in each underflow outlet (10), and each underflow outlet (10) all links to each other with the import of its pump (11) by a pipeline respectively, in the outlet of each pump (11), all be connected with a pipeline that is connected with the top of next platform trough (13) respectively, be that pipeline (13) on the pump (11) of separation tank (7) is communicated with next washing settling groove (8) from the top, and the pipeline (13) on the pump (11) of a last washing settling groove (8) is communicated with from the top with next washing settling groove (8), the overflow that the pipeline (5) that is connected with the stripping operation is connected first washing settling groove (8) exports on the pump (1) of (3), and the pump (1) of the overflow of each washing settling groove (8) behind first washing settling groove (8) outlet (3) all is connected with a washing settling groove (8) on it by an overflow spout (14) respectively, in the end be connected with red mud wash water pipeline (15) on the washing settling groove (8), be connected with the pipeline (16) that is connected with filtering red mud device or red mud dump in the outlet of the pump (11) that the underflow of a washing settling groove (8) outlet in the end (10) is located, export in the overflow of separation tank (7) and be connected with in pump (1) outlet of (3) locating and filter the thick liquid transfer lime (17) that operation is communicated with.
In above-described formation, taphole (9) is located at the middle and upper part of separation tank (7) and every washing settling groove (8) and the lower position of overflow outlet (3) absolute altitude; Washing settling groove is provided with 5～7; Pump (12) is preferably selected shurry pump for use, because contain a certain amount of red mud in the material, the wear resistance of shurry pump is good.Connect corresponding pipeline and valve as required.
The liquid-solid ratio of subsider charging requires more than 7 usually, when handling low-grade bauxite, because red mud amount is bigger, requires control wash water add-on on the technology again.After adopting recycle pump, every platform trough all has part solution to participate in self-circulation, makes the charging liquid-solid ratio meet the requirements, thereby guarantees that subsider normally moves, and makes it reach good effect of settling.
Alumina producer actual wash water add-on in the past is 3.5～4.5t/t-red mud, and behind employing the present invention, the leaching requirement that red mud per ton need add is generally about 1.5～2.2 tons.
In sum, the invention has the beneficial effects as follows: can reduce red mud wash water add-on significantly, when particularly handling low-grade bauxite, bigger in the unit product red mud amount, the red-mud settlement process operations is than under the difficult condition, the charging liquid-solid ratio that can guarantee subsider reaches requirement, thereby guarantee that subsider normally moves, make it have good effect of settling, satisfactorily resolve the laterite washing problem, and the alkali concn that makes whole process is controlled in the scope of reasonable economy, and systematic technical indicator is optimized.
Description of drawings:
Fig. 1 is a synoptic diagram of the present invention.
Embodiment:
Embodiment of the present invention: during enforcement, implement as follows: promptly improve on the basis of the separation tank that in existing conventional red mud separating washing technology, is adopted and washing settling groove and backwash structure, on every separation tank and washing settling groove, increase earlier a taphole respectively, and respectively increase a pump in that the bottom land of separation tank and washing settling groove is other, respectively taphole and its pump of each groove are coupled together with pipeline, send back to the solution that its taphole is discharged in this groove of this taphole again, form self-cycle structure, make in each separation tank and the washing settling groove 10%～60% solution participate in self-circulation, and the mode of backwash routinely by the backwash structure one by one on it subsider or operation send to washing lotion and carry out backflush; The number of times of its red mud backflush is controlled at 5～7 times, and generally the number of times of red mud backflush is preferably 6 times.
When implementing, preferably adopt subordinate device to implement method of the present invention:
1 separation tank (7) and 6 washing settling grooves (8) are set, its separation tank (7) and washing settling groove (8) all adopt finished product of the prior art, on separation tank (7) and every washing settling groove (8), all produce overflow outlet (3), taphole (9) and underflow outlet (10) then respectively, and taphole (9) is located at the position of the middle and upper part of separation tank (7) and every washing settling groove (8), make it be in the lower position of overflow outlet (3) absolute altitude; Locate all to install respectively a pump (1) in each overflow outlet (3), and each overflow outlet (3) is all linked to each other with its pump (1) by a pipeline (2) respectively, locate all to install respectively a pump (12) at each taphole (9), pump (12) is preferably selected shurry pump of the prior art for use, each taphole (9) is all linked to each other with the import of its pump (12) by a pipeline respectively, in the outlet of each pump (12), all connect the circulating line that backflows (6) respectively, and the circulating line that backflows (6) of separation tank (7) is communicated with this separation tank (7) from the top with the stripping slurry transport pipe (4) that connects the stripping operation, the circulating line that backflows (6) that connects in pump (12) outlet of every washing settling groove (8) is all coupled logical from the top of this washing settling groove (8), locate all to install a pump (11) in each underflow outlet (10), and each underflow outlet (10) is all linked to each other with the import of its pump (11) by a pipeline respectively, in the outlet of each pump (11), all connect a pipeline that is connected with the top of next platform trough (13) respectively, soon the pipeline (13) on the pump (11) of separation tank (7) is communicated with next washing settling groove (8) from the top, and the pipeline (13) on the pump (11) of a last washing settling groove (8) is communicated with from the top with next washing settling groove (8); The overflow that the pipeline (5) that will be connected with the stripping operation is connected first washing settling groove (8) exports on the pump (1) of (3), and the pump (1) of the overflow of each washing settling groove (8) behind first washing settling groove (8) outlet (3) all is connected with a washing settling groove (8) on it by an overflow spout (14) respectively, in the end a washing settling groove (8) is gone up and is connected a red mud wash water pipeline (15), connect a pipeline that is connected with filtering red mud device or red mud dump (16) in the outlet of the pump (11) that the underflow of a washing settling groove (8) outlet in the end (10) is located, connection thick liquid transfer lime that is communicated with the filtration operation (17) in pump (1) outlet that the overflow outlet (3) of separation tank (7) is located.
During work, on the one hand, red mud wash water pipeline adds washing water to last washing settling groove, and by the backflush structure one by one on it subsider send to washing water or washing lotion, carry out backflush 6 times; On the other hand, the stripping slurry that comes from the stripping operation enters separation tank, separation tank relies on the other recycle pump of bottom land, part solution is circulated at this groove, with control charging liquid-solid ratio, separation tank overflow pumping controlled filter operation, its underflow is delivered to first washing settling groove, the underflow of each washing settling groove is all carried downwards one by one later on, and the underflow of last platform washing settling groove send filtering red mud or directly send red mud dump.
Claims (8)
1. red mud separating washing technology with self-circulation, it comprises adopts separation tank and washing settling groove and the backwash structure that is adopted in the conventional red mud separating washing technology, it is characterized in that: on every separation tank and washing settling groove, increase a taphole respectively, and respectively increase a pump in that the bottom land of separation tank and washing settling groove is other, respectively taphole and its pump of each groove are coupled together with pipeline, send back to the solution that its taphole is discharged in this groove of this taphole again, form self-cycle structure, make in each separation tank and the washing settling groove 10%～60% solution participate in self-circulation, and by the backwash structure one by one on it subsider or operation send to washing lotion and carry out backflush.
2. the red mud separating washing technology of band self-circulation according to claim 1 is characterized in that: the number of times of red mud backflush is 5～7 times.
3. the red mud separating washing technology of band self-circulation according to claim 1 and 2 is characterized in that: the number of times of red mud backflush is preferably 6 times.
4. device that is used for the red mud separating washing technology of the described band self-circulation of claim 1, it comprises separation tank (7) and washing settling groove (8), it is characterized in that: washing settling groove (8) is at least 5, on separation tank (7) and every washing settling groove (8), all be respectively equipped with overflow outlet (3), taphole (9) and underflow outlet (10), locate all to be respectively equipped with a pump (1) in each overflow outlet (3), and each overflow outlet (3) all links to each other with pump (1) by a pipeline (2) respectively, locate all to be respectively equipped with a pump (12) at each taphole (9), and each taphole (9) links to each other with the import of pump (12) by a pipeline respectively, in the outlet of each pump (12), all be connected with the circulating line that backflows (6) respectively, and the circulating line that backflows (6) of separation tank (7) is communicated with this separation tank (7) from the top with stripping slurry transport pipe (4), and the circulating line that backflows (6) that connects in pump (12) outlet of every washing settling groove (8) is all coupled logical from the top of this washing settling groove (8), locate all to be provided with a pump (11) in each underflow outlet (10), and each underflow outlet (10) all links to each other with the import of its pump (11) by a pipeline respectively, in the outlet of each pump (11), all be connected with a pipeline that is connected with the top of next platform trough (13) respectively, be that pipeline (13) on the pump (11) of separation tank (7) is communicated with next washing settling groove (8) from the top, and the pipeline (13) on the pump (11) of a last washing settling groove (8) is communicated with from the top with next washing settling groove (8), the overflow that the pipeline (5) that is connected with the stripping operation is connected first washing settling groove (8) exports on the pump (1) of (3), and the pump (1) of the overflow of each washing settling groove (8) behind first washing settling groove (8) outlet (3) all is connected with a washing settling groove (8) on it by an overflow spout (14) respectively, in the end be connected with red mud wash water pipeline (15) on the washing settling groove (8), be connected with the pipeline (16) that is connected with filtering red mud device or red mud dump in the outlet of the pump (11) that the underflow of a washing settling groove (8) outlet in the end (10) is located, export in the overflow of separation tank (7) and be connected with in pump (1) outlet of (3) locating and filter the thick liquid transfer lime (17) that operation is communicated with.
5. the device of the red mud separating washing technology of band self-circulation according to claim 4 is characterized in that: washing settling groove (8) is set to 5～7.
6. according to the device of the red mud separating washing technology of claim 4 or 5 described band self-circulations, it is characterized in that: washing settling groove (8) preferably is set to 6.
7. the device of the red mud separating washing technology of band self-circulation according to claim 4 is characterized in that: pump (12) is a shurry pump.
8. the device of the red mud separating washing technology of band self-circulation according to claim 4 is characterized in that: taphole (9) is located at the middle and upper part of separation tank (7) and every washing settling groove (8) and the lower position of overflow outlet (3) absolute altitude thereof.
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| CN 200510200293 CN1868879A (en) | 2005-05-24 | 2005-05-24 | Red mud separating washing technology with self circulation and its device |
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| CN 200510200293 CN1868879A (en) | 2005-05-24 | 2005-05-24 | Red mud separating washing technology with self circulation and its device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103723747A (en) * | 2012-10-15 | 2014-04-16 | 沈阳铝镁设计研究院有限公司 | Method used for reducing steam used for heating red mud washing water |
| CN105217903A (en) * | 2014-06-26 | 2016-01-06 | 沈阳铝镁设计研究院有限公司 | A kind of equipment configuration method of red-mud settlement and separation washing procedure |
| CN107720794A (en) * | 2017-11-09 | 2018-02-23 | 茌平信发华宇氧化铝有限公司 | Subsider scabs soda boiling and reutilization system and method for work |
| CN107902682A (en) * | 2017-12-29 | 2018-04-13 | 杨蕊鸿 | A kind of processing unit and its processing method of alumina producing exsolution red mud |
| CN110025990A (en) * | 2018-05-31 | 2019-07-19 | 沈阳铝镁设计研究院有限公司 | A kind of subsider from dilution technique |
| CN111348688A (en) * | 2018-12-24 | 2020-06-30 | 格林美（江苏）钴业股份有限公司 | Post-treatment device and post-treatment process for cobaltosic oxide synthetic material |
| CN115282646A (en) * | 2022-08-25 | 2022-11-04 | 沈阳铝镁设计研究院有限公司 | Red mud settling separation washing process |
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2005
- 2005-05-24 CN CN 200510200293 patent/CN1868879A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103723747A (en) * | 2012-10-15 | 2014-04-16 | 沈阳铝镁设计研究院有限公司 | Method used for reducing steam used for heating red mud washing water |
| CN105217903A (en) * | 2014-06-26 | 2016-01-06 | 沈阳铝镁设计研究院有限公司 | A kind of equipment configuration method of red-mud settlement and separation washing procedure |
| CN105217903B (en) * | 2014-06-26 | 2017-11-10 | 沈阳铝镁设计研究院有限公司 | A kind of equipment configuration method of red- mud settlement and separation washing procedure |
| CN107720794A (en) * | 2017-11-09 | 2018-02-23 | 茌平信发华宇氧化铝有限公司 | Subsider scabs soda boiling and reutilization system and method for work |
| CN107720794B (en) * | 2017-11-09 | 2023-10-10 | 茌平信发华宇氧化铝有限公司 | Settling tank scar soda boiling and recycling system and working method |
| CN107902682A (en) * | 2017-12-29 | 2018-04-13 | 杨蕊鸿 | A kind of processing unit and its processing method of alumina producing exsolution red mud |
| CN110025990A (en) * | 2018-05-31 | 2019-07-19 | 沈阳铝镁设计研究院有限公司 | A kind of subsider from dilution technique |
| CN111348688A (en) * | 2018-12-24 | 2020-06-30 | 格林美（江苏）钴业股份有限公司 | Post-treatment device and post-treatment process for cobaltosic oxide synthetic material |
| CN111348688B (en) * | 2018-12-24 | 2023-11-21 | 格林美（江苏）钴业股份有限公司 | Device and process for post-treatment of cobaltosic oxide synthetic material |
| CN115282646A (en) * | 2022-08-25 | 2022-11-04 | 沈阳铝镁设计研究院有限公司 | Red mud settling separation washing process |
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