CN105399122A - First-tank temperature controlling and discharging grading method for producing sandy aluminium oxide through two-segment decomposition - Google Patents
First-tank temperature controlling and discharging grading method for producing sandy aluminium oxide through two-segment decomposition Download PDFInfo
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- CN105399122A CN105399122A CN201510949641.6A CN201510949641A CN105399122A CN 105399122 A CN105399122 A CN 105399122A CN 201510949641 A CN201510949641 A CN 201510949641A CN 105399122 A CN105399122 A CN 105399122A
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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
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
- C01F7/144—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by precipitation due to cooling, e.g. as part of the Bayer process
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Abstract
The invention belongs to the field of production of aluminium oxide, and concretely relates to a first-tank temperature controlling and discharging grading method for producing sandy aluminium oxide through two-segment decomposition. According to the method, a part of refined solution is cooled and deployed, the temperature controlling requirement for two-segment decomposition is satisfied, temperature is controlled by directly using cold and hot refined solutions, partial discharging is employed, and the finished product and fine crystal seed of which the quantity satisfies the two-segment decomposition granularity index requirement are discharged in a grading way. The first-tank temperature controlling and discharging grading method for producing sandy aluminium oxide through two-segment decomposition satisfies the requirement on improving the granularity and the strength of the finished product aluminium hydroxide, improves the quality of the finished product aluminium oxide, and also reduces the operation cost, and helps to create relatively good economic benefit for factories.
Description
Technical field
The invention belongs to field of aluminum oxide production, the first-cell temperature being specifically related to a kind of producing sand-shaped alumina by two-section decomposition controls and discharging stage division.
Background technology
Sandy alumina is as the advantage that raw material has good fluidity, dust collector is low, Dust Capacity is low, specific surface area is high of electrolytic aluminum, current two-stage method decomposition of crystal seed is one of main technological route of sandy alumina production, suitable condition is adopted to meet the requirement of seed particles growth, two stages of growing up particular by fine grain agglomeration and crystal seed make crystalline aluminum hydroxide Grain growth, final production sandy alumina.
In two-stage method, first-cell temperature control is the art measure of the most important skill, traditional first groove temperature adjustment is by increasing wide-runner plate heat exchanger, utilize water coolant and slip heat exchange that agglomeration section slurry temperature is dropped to the temperature of first groove requirement of growing up, this temperature control method increases the equipment investment of interchanger and feeding pump, and control slurry temperature by cooling water inflow, flow process is more complicated and uneconomical, reacts delayed a little, underaction.Traditional discharging grading technology flow process decomposes whole discharging to remove into product swirler, and underflow goes finished product to filter, and seed swirler is all removed in overflow, but through-put is large like this, swirler and feeding pump flow thereof and number of units increase, and cause the increase of investment and working cost, field control difficulty is large.
Summary of the invention
For prior art Problems existing, the first-cell temperature that the invention provides a kind of producing sand-shaped alumina by two-section decomposition controls and discharging stage division, and object eliminates prior art to there is the problems such as temperature control is improper, discharging stepped control is difficult.
The first-cell temperature control and the discharging stage division that realize the producing sand-shaped alumina by two-section decomposition of the object of the invention carry out according to following steps:
(1) sodium aluminate concentrate solution of self-acting control filtration step is divided into 15% ~ 25% and 85% ~ 75% two portions according to weight percent in the future, the part wherein accounting for sodium aluminate concentrate solution weight 15% ~ 25% is as hot seminal fluid, and the part accounting for sodium aluminate concentrate solution weight 85% ~ 75% obtains cold seminal fluid after seminal fluid heat exchange system and decomposition nut liquid heat exchange;
(2) the hot seminal fluid in step (1) is mixed to get thin seed slurry with the thin seed presscake from thin seed sedimentation filtration washing system, then with account for the cold seminal fluid of cold seminal fluid gross weight 40% ~ 50% part and allocate in the first groove of agglomeration section and mix, obtain the slurries of solid matter content 100 ~ 200g/L, control slurry temperature 75 DEG C ~ 80 DEG C, slurries are after agglomeration section stops 6 ~ 8 hours, by the groove discharging of agglomeration section end, certainly flow to the first groove of the section of growing up;
The cold seminal fluid of another part accounting for 50% ~ 60% of cold seminal fluid total amount is mixed to get thick seed slurry with the thick seed presscake from thick seed filtering system, thick seed slurry is delivered to the first groove of the section of growing up;
(3) in step (2) by the end groove discharging of agglomeration section, mix in the first groove of the section of growing up with thick seed slurry from the slurries flowing to the first groove of the section of growing up, control mixed slurry temperature at 65 DEG C ~ 70 DEG C, solid matter content 350 ~ 450g/L, decompose 22 ~ 26 hours through intermediate temperature drop, control to decompose final temperature 50 DEG C ~ 55 DEG C and obtain decomposing materials, carry out discharging classification at the section of growing up groove third from the bottom;
(4) finished product classifying cyclone is delivered in the discharging accounting for decomposing materials gross weight 40% in groove third from the bottom for the section of growing up, finished product classifying cyclone underflow removes finished product filter, overflow enters the section of growing up groove second from the bottom, thin seed grading swirler is delivered in the discharging accounting for decomposing materials weight 40% in groove second from the bottom for the section of growing up, thin seed sedimentation filtration washing system is removed in the overflow of thin seed grading swirler, filtration washing obtains thin seed presscake, mixes with the hot seminal fluid in step (1), delivers to the first groove of agglomeration section; Thin seed grading swirler underflow sends to the section of growing up end groove, and the residue decomposing materials discharging in the groove of the section of growing up end, to thick seed filtering system, is filtered and obtained thick seed presscake, mix with the cold seminal fluid of part in step (1), delivers to the first groove of the section of growing up.
Compared with prior art, feature of the present invention and beneficial effect are:
The inventive method decomposes first-cell temperature regulation and control to two sections that produce sandy alumina, by meeting two sections of temperature control requirement of decomposing to the cooling of part seminal fluid, allotment, directly simple by cold and hot seminal fluid temperature control technique, Field adjustment is more flexible, flow process is more rationally succinct, and decrease the amount of the seminal fluid participating in heat exchange, reduce running cost.
The inventive method is to the discharging classification of sandy alumina, adopt part discharging, finished product classifying cyclone and thin seed grading swirler make index be easy to control, classification is only needed to go out to meet the finished product of two ends section control decomposing index request quantity and thin seed, all do not carry out classification by all decomposing discharging, while meeting product requirement, reduce energy consumption, organization of production is more reasonable.
In sum, the first-cell temperature of producing sand-shaped alumina by two-section decomposition of the present invention controls and discharging stage division, meets the granularity and intensity that improve finished product aluminium hydroxide, the quality of finished product aluminum oxide is improved, running cost reduces simultaneously, for factory creates better economic benefit.
Accompanying drawing explanation
Fig. 1 is the first-cell temperature control of producing sand-shaped alumina by two-section decomposition of the present invention and the schematic flow sheet of discharging stage division;
Wherein: 1: the first groove of agglomeration section; 2: agglomeration section end groove; 3: the first groove of the section of growing up; 4: the section of growing up groove third from the bottom; 5: the section of growing up groove second from the bottom; 6: the section of growing up end groove; 7: finished product classifying cyclone; 8: thin seed grading swirler; 9: seminal fluid heat exchange system; 10: thin seed sedimentation filtration washing system; 11; Thick seed filtering system.
Embodiment
Embodiment 1
The first-cell temperature of the producing sand-shaped alumina by two-section decomposition of the present embodiment controls and discharging stage division, as shown in Figure 1, carries out according to following steps:
(1) sodium aluminate concentrate solution of self-acting control filtration step is divided into 15% and 85% two portions according to weight percent in the future, wherein account for the part of sodium aluminate concentrate solution weight 15% as hot seminal fluid, accounting for temperature is 103 DEG C, the part of sodium aluminate concentrate solution weight 85% is after seminal fluid heat exchange system 9 with decomposition nut liquid heat exchange, controller temperature is 67 DEG C, obtains cold seminal fluid;
(2) the hot seminal fluid in step (1) is mixed to get thin seed slurry with the thin seed presscake from thin seed sedimentation filtration washing system 10, then with account for the cold seminal fluid of cold seminal fluid gross weight 50% part and allocate in the first groove 1 of agglomeration section and mix, obtain the slurries of solid matter content 150g/L, control slurry temperature 75 DEG C, slurries are after agglomeration section stops 7 hours, by groove 2 discharging of agglomeration section end, certainly flow to the first groove 3 of the section of growing up;
The cold seminal fluid of another part accounting for 50% of cold seminal fluid total amount is mixed to get thick seed slurry with the thick seed presscake from thick seed filtering system 11, thick seed slurry is delivered to the first groove 3 of the section of growing up;
(3) in step (2) by end groove 2 discharging of agglomeration section, mix in the first groove 3 of the section of growing up with thick seed slurry from the slurries flowing to the first groove 3 of the section of growing up, control mixed slurry temperature at 69 DEG C, solid matter content 450g/L, 26 hours are decomposed through intermediate temperature drop, control to decompose final temperature 55 DEG C and obtain decomposing materials, carry out discharging classification at the section of growing up groove 4 third from the bottom;
(4) finished product classifying cyclone 7 is delivered in the discharging accounting for decomposing materials gross weight 40% in groove 4 third from the bottom for the section of growing up, finished product classifying cyclone 7 underflow removes finished product filter, overflow enters the section of growing up groove 5 second from the bottom, thin seed grading swirler 8 is delivered in the discharging accounting for decomposing materials weight 40% in groove 5 second from the bottom for the section of growing up, thin seed sedimentation filtration washing system 10 is removed in the overflow of thin seed grading swirler 8, filtration washing obtains thin seed presscake, mix with the hot seminal fluid in step (1), deliver to the first groove 1 of agglomeration section; Thin seed grading swirler 8 underflow sends to the section of growing up end groove 6, and the residue decomposing materials discharging in the groove 6 of the section of growing up end, to thick seed filtering system 8, is filtered and obtained thick seed presscake, mix with the cold seminal fluid in step (1), delivers to the first groove 3 of the section of growing up.
Embodiment 2
The first-cell temperature of the producing sand-shaped alumina by two-section decomposition of the present embodiment controls and discharging stage division, as shown in Figure 1, carries out according to following steps:
(1) sodium aluminate concentrate solution of self-acting control filtration step is divided into 25% and 75% two portions according to weight percent in the future, the part wherein accounting for sodium aluminate concentrate solution weight 25% is as hot seminal fluid, and the part accounting for sodium aluminate concentrate solution weight 75% obtains cold seminal fluid after seminal fluid heat exchange system 9 with decomposition nut liquid heat exchange;
(2) the hot seminal fluid in step (1) is mixed to get thin seed slurry with the thin seed presscake from thin seed sedimentation filtration washing system 10, then with account for the cold seminal fluid of cold seminal fluid gross weight 40% part and allocate in the first groove 1 of agglomeration section and mix, obtain the slurries of solid matter content 100 ~ 200g/L, control slurry temperature 75 DEG C ~ 80 DEG C, slurries are after agglomeration section stops 6 ~ 8 hours, by groove 2 discharging of agglomeration section end, certainly flow to the first groove 3 of the section of growing up;
The cold seminal fluid of another part accounting for 60% of cold seminal fluid total amount is mixed to get thick seed slurry with the thick seed presscake from thick seed filtering system 11, thick seed slurry is delivered to the first groove 3 of the section of growing up;
(3) in step (2) by end groove 2 discharging of agglomeration section, mix in the first groove 3 of the section of growing up with thick seed slurry from the slurries flowing to the first groove 3 of the section of growing up, control mixed slurry temperature at 65 DEG C, solid matter content 350g/L, 22 hours are decomposed through intermediate temperature drop, control to decompose final temperature 50 DEG C and obtain decomposing materials, carry out discharging classification at the section of growing up groove 4 third from the bottom;
(4) finished product classifying cyclone 7 is delivered in the discharging accounting for decomposing materials gross weight 40% in groove 4 third from the bottom for the section of growing up, finished product classifying cyclone 7 underflow removes finished product filter, overflow enters the section of growing up groove 5 second from the bottom, thin seed grading swirler 8 is delivered in the discharging accounting for decomposing materials weight 40% in groove 5 second from the bottom for the section of growing up, thin seed sedimentation filtration washing system 10 is removed in the overflow of thin seed grading swirler 8, filtration washing obtains thin seed presscake, mix with the hot seminal fluid in step (1), deliver to the first groove 1 of agglomeration section; Thin seed grading swirler 8 underflow sends to the section of growing up end groove 6, and the residue decomposing materials discharging in the groove 6 of the section of growing up end, to thick seed filtering system 8, is filtered and obtained thick seed presscake, mix with the cold seminal fluid in step (1), delivers to the first groove 3 of the section of growing up.
Claims (1)
1. the first-cell temperature of producing sand-shaped alumina by two-section decomposition controls and a discharging stage division, it is characterized in that carrying out according to following steps:
(1) sodium aluminate concentrate solution of self-acting control filtration step is divided into 15% ~ 25% and 85% ~ 75% two portions according to weight percent in the future, the part wherein accounting for sodium aluminate concentrate solution weight 15% ~ 25% is as hot seminal fluid, and the part accounting for sodium aluminate concentrate solution weight 85% ~ 75% obtains cold seminal fluid after seminal fluid heat exchange system and decomposition nut liquid heat exchange;
(2) the hot seminal fluid in step (1) is mixed to get thin seed slurry with the thin seed presscake from thin seed sedimentation filtration washing system, then with account for the cold seminal fluid of cold seminal fluid gross weight 40% ~ 50% part and allocate in the first groove of agglomeration section and mix, obtain the slurries of solid matter content 100 ~ 200g/L, control slurry temperature 75 DEG C ~ 80 DEG C, slurries are after agglomeration section stops 6 ~ 8 hours, by the groove discharging of agglomeration section end, certainly flow to the first groove of the section of growing up;
The cold seminal fluid of another part accounting for 50% ~ 60% of cold seminal fluid total amount is mixed to get thick seed slurry with the thick seed presscake from thick seed filtering system, thick seed slurry is delivered to the first groove of the section of growing up;
(3) in step (2) by the end groove discharging of agglomeration section, mix in the first groove of the section of growing up with thick seed slurry from the slurries flowing to the first groove of the section of growing up, control mixed slurry temperature at 65 DEG C ~ 70 DEG C, solid matter content 350 ~ 450g/L, decompose 22 ~ 26 hours through intermediate temperature drop, control to decompose final temperature 50 DEG C ~ 55 DEG C and obtain decomposing materials, carry out discharging classification at the section of growing up groove third from the bottom;
(4) finished product classifying cyclone is delivered in the discharging accounting for decomposing materials gross weight 40% in groove third from the bottom for the section of growing up, finished product classifying cyclone underflow removes finished product filter, overflow enters the section of growing up groove second from the bottom, thin seed grading swirler is delivered in the discharging accounting for decomposing materials weight 40% in groove second from the bottom for the section of growing up, thin seed sedimentation filtration washing system is removed in the overflow of thin seed grading swirler, filtration washing obtains thin seed presscake, mixes with the hot seminal fluid in step (1), delivers to the first groove of agglomeration section; Thin seed grading swirler underflow sends to the section of growing up end groove, and the residue decomposing materials discharging in the groove of the section of growing up end, to thick seed filtering system, is filtered and obtained thick seed presscake, mix with the cold seminal fluid of part in step (1), delivers to the first groove of the section of growing up.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510949641.6A CN105399122A (en) | 2015-12-18 | 2015-12-18 | First-tank temperature controlling and discharging grading method for producing sandy aluminium oxide through two-segment decomposition |
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| CN201510949641.6A CN105399122A (en) | 2015-12-18 | 2015-12-18 | First-tank temperature controlling and discharging grading method for producing sandy aluminium oxide through two-segment decomposition |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106629798A (en) * | 2016-12-29 | 2017-05-10 | 东北大学设计研究院（有限公司） | Novel two-stage-decomposition intensive system and process for producing sandy aluminum oxide |
| 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 |
| CN108609641A (en) * | 2018-07-09 | 2018-10-02 | 中铝集团山西交口兴华科技股份有限公司 | A kind of production system and its production technology producing low sodium alumina using low-grade bauxite |
| CN109701758A (en) * | 2018-12-12 | 2019-05-03 | 中国恩菲工程技术有限公司 | To the method for aluminium hydroxide classification |
| CN112429756A (en) * | 2020-12-17 | 2021-03-02 | 中铝国际工程股份有限公司 | Method and device for controlling temperature of first decomposition tank |
| 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 |
| CN113788488A (en) * | 2021-11-02 | 2021-12-14 | 中国铝业股份有限公司 | Ultralow-sodium aluminum hydroxide and preparation method thereof |
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| CN1556035A (en) * | 2003-12-31 | 2004-12-22 | 中国铝业股份有限公司 | Sandlike aluminium oxide disintegration technology |
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| CN1962448A (en) * | 2006-11-23 | 2007-05-16 | 沈阳铝镁设计研究院 | Two-stage decomposition for producing sand-like alumina product and seed classification process |
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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 |
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| CN1556035A (en) * | 2003-12-31 | 2004-12-22 | 中国铝业股份有限公司 | Sandlike aluminium oxide disintegration technology |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106629798A (en) * | 2016-12-29 | 2017-05-10 | 东北大学设计研究院（有限公司） | Novel two-stage-decomposition intensive system and process for producing sandy aluminum oxide |
| 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 |
| CN108609641A (en) * | 2018-07-09 | 2018-10-02 | 中铝集团山西交口兴华科技股份有限公司 | A kind of production system and its production technology producing low sodium alumina using low-grade bauxite |
| CN109701758A (en) * | 2018-12-12 | 2019-05-03 | 中国恩菲工程技术有限公司 | To the method for aluminium hydroxide classification |
| 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 |
| CN112429756A (en) * | 2020-12-17 | 2021-03-02 | 中铝国际工程股份有限公司 | Method and device for controlling temperature of first decomposition tank |
| CN113788488A (en) * | 2021-11-02 | 2021-12-14 | 中国铝业股份有限公司 | Ultralow-sodium aluminum hydroxide and preparation method thereof |
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