CN103130253B - Two stage decomposition process method of Bayer process alumina production - Google Patents
Two stage decomposition process method of Bayer process alumina production Download PDFInfo
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- CN103130253B CN103130253B CN201110380258.5A CN201110380258A CN103130253B CN 103130253 B CN103130253 B CN 103130253B CN 201110380258 A CN201110380258 A CN 201110380258A CN 103130253 B CN103130253 B CN 103130253B
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Abstract
The present invention discloses a two stage decomposition process method of Bayer process alumina production. According to the method, a fine liquid obtained from control filtration and a decomposition mother liquor are subjected to heat exchange through a plate type heat exchanger to obtain a hot fine liquid and a cold fine liquid; the hot fine liquid is mixed with filter cake of a fine seed filter to form a fine seed slurry, and the fine seed slurry is conveyed to an agglomeration segment decomposition first tank through a crystal seed pump to carry out agglomeration decomposition; the cold fine liquid is mixed with filter cake of a coarse seed filter to form a coarse seed slurry, and the coarse seed slurry is conveyed to a growth segment decomposition first tank through a crystal seed pump to carry out growth; the fine seed slurry stays for 4-6 h in the agglomeration segment decomposition first tank, is conveyed to a middle temperature reduction cooler through a submerged pump, is subjected to heat exchange with circulation water, and then enters the growth segment decomposition first tank; the treated fine seed slurry and the coarse seed slurry are continuously subjected to decomposition growth; an end washing fine seed slurry obtained from a fine seed slurry settlement tank is added; the mixed slurry is continuously subjected to decomposition growth in the decomposition first tank; and after completing decomposition growth, the submerged pump is adopted to convey the slurry to a finished product hydrocyclone to grade, and the bottom flow of the hydrocyclone is adopted as a finished product slurry.
Description
Technical field
The present invention relates to a kind of flow and method of decomposition of Bayer process alumina producing.
Background technology
Decomposition of crystal seed is one of critical process of alumina producing Bayer process, and it has great impact to the technico-economical comparison of the seed output and quality of product and full factory.Weigh the unit production capacity of quality, rate of decomposition and the decomposer that kind of the leading indicator of point operation effectiveness is aluminium hydroxide.
The kind point process of sodium aluminate solution just simple crystal seed grow up, also carry out some other physicochemical change, the process that a lot of phenomenon and result of study show whole aluminium hydroxide crystallization is very complicated simultaneously, comprising:
1. the formation of secondary nucleus
2. the breaking and abrasion of aluminum hydroxide crystals
3. the growing up of aluminum hydroxide crystals
4. the agglomeration of aluminum hydroxide grain
So-called agglomeration, under the effect of the power such as the surface tension formed at Van der Waals force, self-adhesion, sticking power and the close contact between capillary force and material exactly, the phenomenon linked together that particulate matter is spontaneous and directed.When sodium aluminate solution decomposes under certain condition, agglomeration can be preponderated.Just should effectively utilize agglomeration mechanism for obtaining the large aluminium hydroxide of granularity, full out increasing the size of lattice crystal grain when crystallization, making it meet the requirements of size.
Growing up of crystal seed causes crystalline aluminum hydroxide thicker with the agglomeration of crystal grain.When plant requirements produces sandy alumina, to create conditions exactly, avoid as much as possible or reduce the formation of the secondary nucleus of kind of timesharing and breaking of aluminum hydroxide grain, promote growing up and the agglomeration of crystal grain of crystal simultaneously.
Summary of the invention
The object of the invention is to: a kind of two sections of decomposition process methods that Bayer process alumina producing is provided, with overcome crystal seed that prior art exists grow up to cause with the agglomeration of crystal grain crystalline aluminum hydroxide thicker, plant the deficiency such as to break that timesharing forms secondary nucleus, aluminum hydroxide grain.
In order to solve described technical problem, the present invention takes following technical scheme: two sections of decomposition process of the present invention comprise agglomeration section decomposition process and the section of growing up decomposition process, process is as follows: after plate-type heat exchanger and decomposition nut liquid carry out heat exchange, obtain hot seminal fluid and cold seminal fluid from controlled filter out seminal fluid, hot seminal fluid becomes thin seed slurry after mixing with the filter cake of thin seed filter, control mixed slurry temperature at 75 ~ 80 DEG C, admittedly containing 120 ~ 150g/l, be pumped into agglomeration section decomposer through crystal seed and carry out agglomeration decomposition, cold seminal fluid is then mixed into thick seed slurry with the filter cake of thick seed filter, controls mixed slurry temperature at 60 ~ 65 DEG C, admittedly containing 300-450g/l, be pumped into the section of growing up decomposer grow up through crystal seed, agglomeration section intermediate temperature drop water cooler is delivered to through agglomeration section submerged pump and recirculated water carries out heat exchange after thin seed slurry stops 4-6 hour in agglomeration section decomposer, slurry temperature after heat exchange is 60 ~ 65 DEG C, then the first groove of the section of growing up decomposer is entered, proceed decomposition with thick seed slurry to grow up, grow up and carry out 18 ~ 22 hours, add the thin seed slurry of the end washing come from thin seed subsider, mixed slurries proceed decomposition and grow up in the section of growing up decomposer, decompose in the process of growing up and adopt the section of growing up intermediate temperature drop water cooler to cool slip, to control to decompose final temperature at 48 ~ 50 DEG C, decompose after 30-35 hour, slurry pipeline transport is carried out classification to finished product water spigot by the employing section of growing up submerged pump, the underflow of finished product water spigot is as finished product slip, be transported to finished product filter to filter, the overflow of finished product water spigot then enters thick seed swirler and carries out classification.
Be 75 ~ 80 DEG C with the hot seminal fluid temperature obtained after mother liquor heat exchange, cold seminal fluid temperature is 60 ~ 65 DEG C.
Hot seminal fluid accounts for the 30-40% of total semen volume, and cold seminal fluid accounts for the 60-70% of total semen volume.
Underflow after thick seed cyclone classification is delivered to thick seed filter as thick seed slurry and is filtered, and the filter cake obtained after filtration mixes with cold seminal fluid, delivers to the section of growing up decomposer; The overflow of thick seed swirler then enters the sedimentation of thin seed subsider.
Underflow after the sedimentation of meticulous seed subsider is divided into two portions, and a part is delivered to thin seed filter and filtered after thin seed washing device washing, then mixes with hot seminal fluid, as the charging of agglomeration section decomposition process; Another part directly adds the medial launder of the section of growing up decomposition process, as thick seed after growing up 18 ~ 22 hours without washing.
Account for the 30-40% of underflow total amount through washing, the underflow that filters, the underflow directly adding the section of growing up middle portion groove without washing accounts for the 60-70% of underflow total amount.
The number percent related in foregoing, refers to weight percent.
Two sections of decomposition process methods of Bayer process alumina producing of the present invention, by effectively guiding with the process of growing up the agglomeration of crystal seed, thus greatly improve granularity and the intensity of finished product aluminium hydroxide, the quality of finished product aluminum oxide is improved, better to meet the requirement of subsequent disposal operation (as electrolysis), therefore better selling price is obtained, for factory creates better economic benefit.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention (flow sheet equipment containing process), wherein
The 1-agglomeration section decomposer 1-1 agglomeration section decomposer first groove 1-2 agglomeration section decomposer end groove 2-agglomeration section submerged pump 3-agglomeration section intermediate temperature drop water cooler 4-section of the growing up decomposer 4-1 section of the growing up decomposer 4-2 section of the growing up medial launder 4-3 section of the growing up pan tank 5-section of the growing up submerged pump 6-section of growing up intermediate temperature drop water cooler 7-finished product water spigot 8-thick seed water spigot 9-thin seed subsider 10-thin seed washing device 11-thin seed filter 12-thin seed seed mixer 13-thick seed filter 14-thick seed seed mixer 15-decomposition nut liquid storing unit 16 seminal fluid heat exchanger.
Embodiment
Embodiments of the invention:
Embodiment one: as shown in Figure 1, from controlled filter seminal fluid out, two-way is divided into carry out heat exchange through plate-type heat exchanger, the temperature of a part (30%) after plate-type heat exchanger heat exchange is at 80 DEG C, become hot seminal fluid, another part (70%) controls the temperature after its heat exchange at 65 DEG C, becomes cold seminal fluid; Hot seminal fluid becomes thin seed slurry after mixing in thin seed seed mixer 12 with the filter cake of thin seed filter 11, controls mixed slurry temperature at about 77 DEG C, admittedly containing 150g/l, be pumped in agglomeration section decomposer 1 carry out agglomeration through crystal seed; Cold seminal fluid is then mixed into thick seed slurry with the filter cake of thick seed filter 13 in thick seed seed mixer 14, controls mixed slurry temperature at 62 DEG C, admittedly containing 450g/l, is pumped into the first groove 4 of the decomposition section of growing up grows up through crystal seed.
Slip stops in agglomeration section decomposer 1 to be delivered to agglomeration section intermediate temperature drop water cooler 3 through agglomeration section submerged pump 2 after 6 hours and carries out heat exchange with recirculated water, slurry temperature after heat exchange is 60 DEG C, then the first groove 4 of the section of growing up is entered, proceed decomposition with thick seed slurry to grow up, carry out 20 hours growing up, add the thin seed slurry washed from the end of thin seed subsider 9, mixed slurries proceed decomposition and grow up in the section of growing up decomposer 4, decompose in the process of growing up and adopt the section of growing up intermediate temperature drop water cooler 6 pairs of slips to cool, to control to decompose final temperature at 50 DEG C, decompose after 32 hours, slurry pipeline transport is carried out classification to finished product water spigot 7 by the employing section of growing up submerged pump 5, the underflow of finished product water spigot 7 is as finished product slip, be transported to finished product to filter, the overflow of finished product water spigot 7 then enters thick seed swirler 8 and carries out classification, thick seed swirler 8 underflow is delivered to thick seed filter 13 as thick seed slurry and is filtered, the filter cake obtained after filtration mixes with cold seminal fluid in thick seed seed mixer 14, deliver to the section of growing up decomposer 4, overflow then enters thin seed subsider 9, after sedimentation after a while, the underflow of thin seed subsider 9 is divided into two portions, a part is delivered to thin seed filter 11 and is filtered after thin seed washing device 10 washs, then mix with hot clear liquid in thin seed seed mixer 12, as agglomeration section feeding, another part then adds the decomposition section of growing up medial launder.
Embodiment two: as shown in Figure 1, from controlled filter seminal fluid out, two-way is divided to carry out heat exchange through plate-type heat exchanger, the temperature of a part (35%) after plate-type heat exchanger heat exchange is at 76 DEG C, become hot seminal fluid, another part (65%) controls the temperature after its heat exchange at 62 DEG C, become cold seminal fluid, hot seminal fluid becomes thin seed slurry after mixing in thin seed seed mixer 12 with the filter cake of thin seed filter 11, control mixed slurry temperature at about 75 DEG C, admittedly containing 120g/l, be pumped in agglomeration section decomposer 1 through crystal seed and carry out agglomeration; Cold seminal fluid is then mixed into thick seed slurry with the filter cake of thick seed filter 13 in thick seed seed mixer 14, controls mixed slurry temperature at 60 DEG C, admittedly containing 300g/l, is pumped into the first groove 4 of the decomposition section of growing up grows up through crystal seed.
Slip stops in agglomeration section decomposer 1 to be delivered to agglomeration section intermediate temperature drop water cooler 3 through agglomeration section submerged pump 2 after 6 hours and carries out heat exchange with recirculated water, slurry temperature after heat exchange is 60 DEG C, then the first groove 4 of the section of growing up is entered, proceed decomposition with thick seed slurry to grow up, carry out 20 hours growing up, add the thin seed slurry washed from the end of thin seed subsider 9, mixed slurries 4 proceed decomposition and grow up in the section of growing up decomposer, decompose in the process of growing up and adopt the section of growing up intermediate temperature drop water cooler 6 pairs of slips to cool, to control to decompose final temperature at 50 DEG C, decompose after 32 hours, slurry pipeline transport is carried out classification to finished product water spigot 7 by the employing section of growing up submerged pump 5, the underflow of finished product water spigot 7 is as finished product slip, be transported to finished product to filter, the overflow of finished product water spigot 7 then enters thick seed swirler 8 and carries out classification, the underflow of thick seed swirler 8 is delivered to thick seed filter 13 as thick seed slurry and is filtered, the filter cake obtained after filtration mixes with cold seminal fluid in thick seed seed mixer 14, deliver to the section of growing up decomposer 4, overflow then enters thin seed subsider 9, after sedimentation after a while, the underflow of thin seed subsider 9 is divided into two portions, a part is delivered to thin seed filter 11 and is filtered after thin seed washing device 10 washs, then mix with hot clear liquid in thin seed seed mixer 12, as agglomeration section feeding, another part then adds the decomposition section of growing up medial launder.
Claims (6)
1. two sections of decomposition process methods of Bayer process alumina producing, is characterized in that: two sections of described decomposition process comprise agglomeration section and the section of growing up, process is as follows: after plate-type heat exchanger and decomposition nut liquid carry out heat exchange, obtain hot seminal fluid and cold seminal fluid from controlled filter out seminal fluid, hot seminal fluid becomes thin seed slurry after mixing with the filter cake of thin seed filter, control mixed slurry temperature at 75 ~ 80 DEG C, admittedly containing 120 ~ 150g/l, be pumped into agglomeration section decomposer (1) through crystal seed and carry out agglomeration decomposition, cold seminal fluid is then mixed into thick seed slurry with the filter cake of thick seed filter (13), controls mixed slurry temperature at 60 ~ 65 DEG C, admittedly containing 300-450g/l, be pumped into the section of growing up decomposer (4) grow up through crystal seed, deliver to agglomeration section intermediate temperature drop water cooler (3) through agglomeration section submerged pump (2) after thin seed slurry stops 4-6 hour in agglomeration section decomposer and carry out heat exchange with recirculated water, slurry temperature after heat exchange is 60 ~ 65 DEG C, then the first groove of the section of growing up decomposer is entered, proceed decomposition with thick seed slurry to grow up, grow up and carry out 18 ~ 22 hours, add the unwashed thin seed slurry come from thin seed subsider (9), mixed slurries proceed decomposition and grow up in the section of growing up decomposer, decompose in the process of growing up and adopt the section of growing up intermediate temperature drop water cooler (6) to cool slip, to control to decompose final temperature at 48 ~ 50 DEG C, decompose after 30-35 hour, slurry pipeline transport is carried out classification to finished product water spigot (7) by the employing section of growing up submerged pump (5), the underflow of finished product water spigot (7) is as finished product slip, be transported to finished product filter to filter, the overflow of finished product water spigot (7) then enters thick seed swirler (8) and carries out classification.
2. two sections of decomposition process methods of Bayer process alumina producing according to claim 1, is characterized in that: be 75 ~ 80 DEG C with the hot seminal fluid temperature obtained after mother liquor heat exchange, and cold seminal fluid temperature is 60 ~ 65 DEG C.
3. two sections of decomposition process methods of Bayer process alumina producing according to claim 1, it is characterized in that: hot seminal fluid accounts for the 30-40% of total semen volume, cold seminal fluid accounts for the 60-70% of total semen volume.
4. two sections of decomposition process methods of Bayer process alumina producing according to claim 1, it is characterized in that: the underflow after thick seed swirler (8) classification is delivered to thick seed filter (13) as thick seed slurry and filtered, the filter cake obtained after filtration mixes with cold seminal fluid, delivers to the section of growing up decomposer (4); The overflow of thick seed swirler (8) then enters the sedimentation of thin seed subsider (9).
5. two sections of decomposition process methods of Bayer process alumina producing according to claim 4, it is characterized in that: the underflow after the sedimentation of meticulous seed subsider (9) is divided into two portions, a part is delivered to thin seed filter (11) and is filtered after thin seed washing device (10) washing, then mix with hot seminal fluid, as the charging of agglomeration section decomposition process; Another part directly adds the medial launder of the section of growing up decomposition process, as thick seed after growing up 18 ~ 22 hours without washing.
6. two sections of decomposition process methods of Bayer process alumina producing according to claim 5, it is characterized in that: account for the 30-40% of underflow total amount through washing, the underflow that filters, the underflow directly adding the section of growing up medial launder without washing accounts for the 60-70% of underflow total amount.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103159241A (en) * | 2011-12-15 | 2013-06-19 | 贵阳铝镁设计研究院有限公司 | Two-section decomposition process for alumina production by Bayer process |
| CN105399122A (en) * | 2015-12-18 | 2016-03-16 | 东北大学设计研究院（有限公司） | First-tank temperature controlling and discharging grading method for producing sandy aluminium oxide through two-segment decomposition |
| CN106629798B (en) * | 2016-12-29 | 2018-03-09 | 东北大学设计研究院（有限公司） | The intensification system and technique of a kind of producing sand-shaped alumina by two-section decomposition |
| CN106986362A (en) * | 2017-04-12 | 2017-07-28 | 柳健康 | A kind of sodium aluminate solution high concentration is low admittedly containing one section of seeded precipitation technique |
| 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 |
| CN114264171A (en) * | 2021-12-09 | 2022-04-01 | 沈阳铝镁设计研究院有限公司 | Semen cooling device and process for two-stage decomposition |
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| CN1631786A (en) * | 2004-12-28 | 2005-06-29 | 中国铝业股份有限公司 | Process for producing sandy alumina by crystal seed decomposition |
| CN101070170A (en) * | 2007-05-30 | 2007-11-14 | 山东铝业股份有限公司 | Small two-stage method aluminium hydroxide crystal seed decomposing method |
| CN101092242A (en) * | 2007-05-22 | 2007-12-26 | 山东铝业股份有限公司 | Three stages, two seeds technique of seed crystal decomposition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1631786A (en) * | 2004-12-28 | 2005-06-29 | 中国铝业股份有限公司 | Process for producing sandy alumina by crystal seed decomposition |
| CN101092242A (en) * | 2007-05-22 | 2007-12-26 | 山东铝业股份有限公司 | Three stages, two seeds technique of seed crystal decomposition |
| CN101070170A (en) * | 2007-05-30 | 2007-11-14 | 山东铝业股份有限公司 | Small two-stage method aluminium hydroxide crystal seed decomposing method |
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