CN109678185A - A kind of devices and methods therefor for crude liquid refining in alumina producing - Google Patents
A kind of devices and methods therefor for crude liquid refining in alumina producing Download PDFInfo
- Publication number
- CN109678185A CN109678185A CN201811552066.6A CN201811552066A CN109678185A CN 109678185 A CN109678185 A CN 109678185A CN 201811552066 A CN201811552066 A CN 201811552066A CN 109678185 A CN109678185 A CN 109678185A
- Authority
- CN
- China
- Prior art keywords
- crude liquid
- flocculant
- lime
- milk
- liquid refining
- 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.)
- Pending
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000007670 refining Methods 0.000 title claims abstract description 34
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 28
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 28
- 238000004062 sedimentation Methods 0.000 claims abstract description 13
- 238000000746 purification Methods 0.000 claims abstract description 7
- 238000007667 floating Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000006071 cream Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 15
- 239000003513 alkali Substances 0.000 abstract description 10
- 238000004140 cleaning Methods 0.000 abstract description 9
- 238000001914 filtration Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000003518 caustics Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000006467 substitution reaction Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 238000000354 decomposition reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229910001388 sodium aluminate Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 208000004396 mastitis Diseases 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention relates to a kind of devices and methods therefors for crude liquid refining in alumina producing.Described device includes: sequentially connected milk of lime mixer, flocculant mixer, crude liquid refining subsider, sperm slot.The described method includes: milk of lime is added in the discharge of crude liquid into alumina producing, mixes, add flocculant, mix, purification sedimentation, overflow obtains sperm.The invention proposes be used for crude liquid refining using the new technology for settling substitution control filtering, replace traditional leaf filter system using crude liquid refining subsider, overcome the raising of leaf filter alkali cleaning bring steam expense, the system that caustic wash section clear liquid enters causes sperm RP reduction, the degree of supersaturation for decomposing stoste reduces, and resolution ratio reduces, the defect brought a negative impact to production, and the method for the invention process is more simple, operating cost is lower.
Description
Technical field
The present invention relates to a kind of devices and methods therefors for crude liquid refining in alumina producing, belong to alumina producing neck
Domain.
Background technique
Crude liquid refining process is generally included in process for making alumina, gained sperm is used for subsequent decomposition process.Tradition
Crude liquid refining is the crude liquid that red-mud separation slot overflows to be sent to crude liquid slot, in crude liquid slot using control filter type
Be added a certain amount of milk of lime (filtrating aid function), crude liquid reacted with milk of lime after by crude liquid be pumped into leaf filter system (leaf filter) into
Row filtering, filtered liquid is sperm, is sent to decomposition process, as shown in Figure 2.
Since Traditional control filtering technique is complicated, production run is costly；And since leaf filter needs frequent alkali cleaning,
Change clear liquid after the alkali cleaning of part can enter production system, cause to decompose the reduction of stoste degree of supersaturation, decomposing output capacity reduces；Furthermore
Leaf filter alkali cleaning needs to consume steam, will also result in cost raising.
Summary of the invention
In order to solve the above-mentioned technical problem, spy of the present invention proposes a kind of new equipment of crude liquid refining in alumina producing, benefit
Replace control filtration step with sedimentation, it is complicated to solve Traditional control filtering technique, the costly problem of production run, and
Various problems brought by the frequent alkali cleaning of leaf filter.
Technical solution of the present invention is specific as follows:
A kind of device for crude liquid refining in alumina producing, comprising: sequentially connected milk of lime mixer, flocculant
Mixer, crude liquid refining subsider, sperm slot；Plate and frame filter press is also connected in the bottom of the crude liquid refining subsider.
Described device further includes the ancillary equipment for guaranteeing technique and operating normally, and such as separates flood pump, milk of lime addition pump, wadding
Solidifying agent addition pump, filter press feed pump.
In described device, the flocculant mixer is set there are two flocculant adding mouth, is located at flocculant mixer
Front-end and back-end.
Described device further includes floating material on-line detector, for monitoring the content of sperm floating material.
The working principle of described device is as follows: the crude liquid in alumina producing is pumped into crude liquid refining by separation overflow and sinks
Slot is dropped, a milk of lime mixer and a flocculant mixer are successively respectively set on crude liquid refining settling tank feeding pipe,
Crude liquid is mixed with milk of lime, flocculant respectively；Gained mixed liquor is sent into sedimentation, the overflow of sedimentation in crude liquid refining subsider
Sperm is sent into decomposition process；And plate and frame filter press filters pressing is sent into the underflow settled, gained filtrate is sent to red-mud separation subsider,
Underflow after filters pressing is sent to raw material workshop and enters ore pulp preparation section.
The present invention also provides a kind of methods of crude liquid refining in alumina producing, comprising: thick into gained alumina producing
Milk of lime is added in the discharge of liquid, mixes, adds flocculant, mixes, purification sedimentation, overflow obtains sperm.
Shown crude liquid is to be produced after dissolution, dilution, sedimentation process in process for making alumina containing a small amount of solid
The sodium aluminate solution of body impurity (based on fine grained floating material).
In the method, fine grained floating material concentration needs to reach 50~400mg/l range in the discharge, preferably exists
100-200mg/L range can be mixed with milk of lime.
In the method, many factors such as comprehensive fine grained floating material concentration, the additional amount of the milk of lime are 1-10g
Milk of lime/1L discharge, particularly preferred 1-5g milk of lime/1L discharge, further preferably 3g milk of lime/1L discharge.
In the method, many factors such as comprehensive fine grained floating material concentration, the additive amount of the flocculant are 5-
50ppm, especially 10-30ppm；In order to obtain better refining effect, after flocculant is added and mixes, purification sedimentation is carried out
Before, flocculant is added again, i.e., adds flocculant twice in entire subtractive process.
In the method, it is described purification sedimentation time usually in 15-120min, the practical effect of settling of concrete foundation and
It is fixed；Overflow, that is, sperm after sedimentation, is sent to decomposition process；And the underflow settled carries out filters pressing, gained filtrate is sent to red-mud separation
Subsider, the underflow after filters pressing are sent to raw material workshop and enter ore pulp preparation section.
The basic principle of this method is as follows: after crude liquid is just heavy, the lime suppurative mastitis of sodium aluminate and Optimum in gained discharge
Raw reaction generates aqueous tricalcium aluminate (abbreviation TCA)；At the same time, the fine particle solid impurity in crude liquid discharge is filled into TCA
Lattice in, form the biggish solid particle of particle, settling property is effectively improved；Further promote under flocculant effect again
Into red mud solid particles sediment.The content of fine grained floating material is less than 20mg/L in sperm obtained by this method, and refining effect is very
It is ideal.
Advantage is the present invention compared with prior art:
The invention proposes crude liquid refining is used for using the new technology for settling substitution control filtering, settled using crude liquid refining
Slot replaces traditional leaf filter system, overcomes the raising of leaf filter alkali cleaning bring steam expense, and caustic wash section clear liquid enters
System causes sperm RP reduction, and the degree of supersaturation for decomposing stoste reduces, and resolution ratio reduces, and lacks to what production was brought a negative impact
It falls into, and the method for the invention process is more simple, operating cost is lower.
Detailed description of the invention
Fig. 1 is the process flow chart of crude liquid refining method in alumina producing of the present invention.
In figure: 1, flocculant addition pump；2, milk of lime addition pump；3, flood pump is separated；4, milk of lime mixer；5, it flocculates
Agent mixer；6, crude liquid refining subsider；7, sperm slot；8, sperm pumps；9, plate and frame filter press；10, filter press feed pump.
Fig. 2 is that existing alumina producing controls filtering technique flow chart.
Specific embodiment
The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention..
In embodiment, unless otherwise specified, device therefor is the equipment of this field routine.
Embodiment 1:
The present embodiment provides a kind of device for crude liquid refining in alumina producing, such as Fig. 1, comprising: sequentially connected
Milk of lime mixer 4, flocculant mixer 5, crude liquid refining subsider 6, sperm slot 7；At the bottom of the crude liquid refining subsider
Portion is also connected with plate and frame filter press 9.
Described device further include: milk of lime addition pump 2, flocculant addition pump 1, separation flood pump 3, filter press feed pump
10。
In described device, the flocculant mixer is set there are two flocculant adding mouth, is located at flocculant mixer
Front-end and back-end.
Described device further includes floating material on-line detector, for monitoring the content of floating material in sperm.
Each equipment specifically connects as follows:
The separation flood pump 3 is connect with the feed inlet of crude liquid refining subsider 6, in separation flood pump 3 and crude liquid essence
Increase by two mixing channels between subsider 6 processed on pipeline, one for separating overflow and the mixing of milk of lime (milk of lime mixer
4) a, mixing (flocculant mixer 5) for being used for flocculant and separating overflow.
The outlet of the crude liquid subsider is divided into two parts, and a part is overflow, and overflow is into sperm slot 7；A part is
Underflow, underflow are sent into plate and frame filter press 9 by filter press feed pump 10, are separated by solid-liquid separation, and solid send ore pulp to prepare after separation,
Liquid is back to separation tank.
Embodiment 2
The present embodiment provides a kind of methods of crude liquid refining in alumina producing, the specific steps are as follows:
After the crude liquid of certain factory is just heavy, lime is added into discharge in 100-200mg/L for the control of floating material concentration in discharge
Cream mixes, adds flocculant, mixes, and purification sedimentation, overflow is gained sperm, send to decomposition process.
Wherein, milk of lime additional amount is 3g/1L crude liquid, the additional amount 20ppm of flocculant；After flocculant is added and mixes,
Before carrying out purification sedimentation, flocculant is added again.
Through detecting, floating material content is less than 20mg/L in gained sperm, meets the needs of decomposition process.
Effect compares:
(1) crude liquid refining is carried out using Traditional control filter type, the daily alkali cleaning of usual every leaf filter is primary, each alkali
The time is washed in 5-6h；And process for refining of the present invention is used, this part-time can be saved, production efficiency is greatly improved, simultaneously
Alkali cleaning steam expense is saved, production cost is reduced.
(2) in conventional method, when alkali cleaning causes sperm RP to decline 0.01, decomposing stoste degree of supersaturation reduces 1.38g/L, point
Solution rate reduces by 0.57%, and sperm output capacity reduces 0.98kg/m3, it will cause very big economic loss.Using work of the present invention
Skill can avoid the above problem and generate.
Although above the present invention is described in detail with a general description of the specific embodiments,
On the basis of the present invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Cause
This, these modifications or improvements, fall within the scope of the claimed invention without departing from theon the basis of the spirit of the present invention.
Claims (10)
1. a kind of device for crude liquid refining in alumina producing characterized by comprising sequentially connected milk of lime mixing
Device, flocculant mixer, crude liquid refining subsider, sperm slot.
2. the apparatus according to claim 1, which is characterized in that the flocculant mixer set there are two flocculant add
Mouthful, it is located at the front-end and back-end of flocculant mixer.
3. device according to claim 1 or 2, which is characterized in that be also connected in the bottom of the crude liquid refining subsider
Plate and frame filter press.
4. device according to claim 1 to 3, which is characterized in that described device further includes separation flood pump, lime
Cream addition pump, flocculant addition pump, filter press feed pump.
5. device according to claim 1 to 4, which is characterized in that described device further includes floating material on-line checking
Instrument.
6. a kind of method of crude liquid refining in alumina producing characterized by comprising the discharge of crude liquid into alumina producing
Middle addition milk of lime mixes, adds flocculant, mixes, and purification sedimentation, overflow obtains sperm.
7. according to the method described in claim 6, it is characterized in that, fine grained floating material concentration needs to reach 50 in the discharge
~400mg/l range, preferably in 100-200mg/L range, side is mixed with milk of lime；
And/or the additional amount of the milk of lime be 1-10g milk of lime/1L discharge, preferably 1-5g milk of lime/1L discharge, further
Preferably 3g milk of lime/1L discharge.
8. method according to claim 6 or 7, which is characterized in that the additive amount of the flocculant is 5-50ppm, preferably
10-30ppm。
9. according to method as claimed in claim 6 to 8, which is characterized in that after flocculant is added and mixes, refine and sink
Before drop, flocculant is added again.
10. according to any method of claim 6-9, which is characterized in that the underflow of the sedimentation carries out filters pressing, gained filter
Liquid is sent to red-mud separation subsider, and the underflow after filters pressing is sent to raw material workshop and enters ore pulp preparation section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811552066.6A CN109678185A (en) | 2018-12-18 | 2018-12-18 | A kind of devices and methods therefor for crude liquid refining in alumina producing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811552066.6A CN109678185A (en) | 2018-12-18 | 2018-12-18 | A kind of devices and methods therefor for crude liquid refining in alumina producing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109678185A true CN109678185A (en) | 2019-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811552066.6A Pending CN109678185A (en) | 2018-12-18 | 2018-12-18 | A kind of devices and methods therefor for crude liquid refining in alumina producing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114917630A (en) * | 2022-06-01 | 2022-08-19 | 中铝国际工程股份有限公司 | Novel red mud sedimentation flocculating agent adding device |
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Cited By (2)
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| CN114917630A (en) * | 2022-06-01 | 2022-08-19 | 中铝国际工程股份有限公司 | Novel red mud sedimentation flocculating agent adding device |
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Application publication date: 20190426 |