CN205590316U - Device of bayer process alkali red mud is burnt till to dry process - Google Patents
Device of bayer process alkali red mud is burnt till to dry process Download PDFInfo
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- CN205590316U CN205590316U CN201620118527.9U CN201620118527U CN205590316U CN 205590316 U CN205590316 U CN 205590316U CN 201620118527 U CN201620118527 U CN 201620118527U CN 205590316 U CN205590316 U CN 205590316U
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Abstract
The utility model provides a device of bayer process alkali red mud is burnt till to dry process, including pressure filter, lime stone storage tank, pure alkaline storing tank, bauxite storage tank, vertical blendor etc, storage tank, pressure filter all connect in vertical blendor, blendor are connected in the desicator, and the desicator is connected with the feeding elephant trunk of rotary kiln, and the rotary kiln is connected in vertical roller mill, vertical roller mill's blown down tank passes through the tube coupling the chamotte powder dissolves out the groove, the drain line that the chamotte powder dissolves out the groove connects the desilicator divides the groove with planting, plant the liquid outlet pipe who divides the groove and connect the evaporation unit. The utility model discloses to the problem that a large amount of alkali red muds are hard to the processing, on the basis of aluminium oxide tradition sintering process, the alkali red mud dry process firing technology of proposition follows whole flow and has realized dry process firing technology, uses complete planting and divides technology, and messenger's sintering process process flow reduced more than the third, synthesizes to calculate to plant and divide a rate of decomposition to bring up to more than 90%, on the basis of reduction equipment and personnel's input, has reduced the energy consumption.
Description
Technical field
This utility model belongs to industrial waste and administers field, is specifically related to the dry method process for calcining of a kind of alkali red mud.
Background technology
Aluminum i ndustry is the basic industry of China, and bauxite is in great demand by economic construction, and China's great majority are the bauxite of middle-low grade.More than the 99% of China's aluminium oxide yield is Bayer process production technology at present, and along with bauxite increasingly sharpens for ore deposit grade downward trend, the aluminium oxide and the sodium oxide that abandon in Bayer process red mud are more and more higher, cause the significant wastage of resource.On the other hand, due to domestic bauxite quality worse and worse, price is more and more higher, Bayer process cost is also constantly raising, some enterprise has to from external a large amount of import bauxite in recent years, and data shows, the external dependence degree of China's bauxite aluminium resource is up to 55% in recent years.
Although for many years, some R&D institutions of China and enterprise have developed the technology such as series process and mixed combining method accordingly to utilize alkali red mud, to improve aluminium oxide and the response rate of sodium oxide, but both approaches is both needed to use the wet method of conventional sintering method to burn till, this causes, and production system complexity is huge, capital expenditure increases, energy consumption is high, be difficult to series of problems such as controlling, product quality is poor, economy is the best, is the most progressively in the underproduction or end-of-life state.
Utility model content
In place of the deficiencies in the prior art, the purpose of this utility model is to propose a kind of method that dry method burns till Bayer process alkali red mud.
The technical scheme realizing this utility model purpose is:
A kind of dry method burns till the device of Bayer process alkali red mud, including pressure filter, limestone storage tank, soda storage tank, bauxite storage tank, vertical mixer, exsiccator, rotary kiln, vertical mill, chamotte powder dissolution groove, desilicator, seed precipitation tank evaporation element；
Described bauxite storage tank, limestone storage tank, soda storage tank are all connected to described vertical mixer, and described vertical mixer is also attached to the outlet of described cake of filter-press；The discharging opening of described vertical mixer is connected to described exsiccator, and the discharging pipeline of described exsiccator is connected with the feed chute of rotary kiln, and the discharging opening of described rotary kiln is connected to the feed chute of described vertical mill；
The blow tank of described vertical mill connects described chamotte powder dissolution groove by pipeline, and the drain line of described chamotte powder dissolution groove connects described desilicator, and desilicator connects described seed precipitation tank by pipeline；The drain pipe road of described seed precipitation tank connects described evaporation element.
Wherein, the heat medium pipeline that adds of described exsiccator is connected to the exhanst gas outlet of described rotary kiln.
Wherein, described evaporation element includes sextuple effect and the triple effect evaporator being connected in series, and described sextuple effect connects described triple effect evaporator, and the drain pipe road of triple effect evaporator is connected to described desilicator.
Further, described triple effect evaporator is nickel vaporizer.
Using the device that the utility model proposes, a kind of dry method is burnt till the method for Bayer process alkali red mud, is comprised the following steps:
(1) carrying out dispensing with alkali red mud, agstone, bauxite powder and soda, proportion scale is red mud filter cake 45～70 mass parts, limestone 26～35 mass parts, bauxite powder 0～15 mass parts, soda 5～15 mass parts；
(2) material the prepared vertical strengthened batch mixer of entrance is sufficiently mixed；
(3) will blend together material entrance exsiccator to be dried, the material being dried enters rotary kiln and is sintered, and sintering temperature controls at 1150～1200 DEG C, and sintered clinker cooler cools down, the most levigate；
(4) chamotte powder adding adjustment liquid and carries out dissolution, liquid-solid ratio is 3～4:1, and dissolution time is 15～20 minutes, and temperature is 75 DEG C.
(5), after carrying out the slag that step (4) chamotte powder dissolution obtains 5～7 times the most fully washing, washing liquid is as the adjustment liquid of step (4), and slag is stored up；
(6) desiliconization is carried out after solution step (4) chamotte powder dissolution obtained and sodium aluminate crystallization mixed dissolution.Desiliconization temperature 160～180 DEG C, time 1～2 hours；
(7) the solution hydrogenation alumina seed that step (6) desiliconization obtains is carried out kind of a point decomposition, decompose and obtain Al (OH)3, then roasting obtains aluminium oxide；
(8) seed precipitation solution that step (7) obtains being undertaken in two steps evaporation and salt discharge, it is Na that the first step is evaporated to concentration of lye2O 280～300g/L, uses nickel material vaporizer to carry out second step evaporation salt discharge the most again, and the concentration of lye obtained is Na2O 500～600g/L.
(9) the seed precipitation solution decrease temperature crystalline after being evaporated by second step, obtains sodium aluminate crystal, and sodium aluminate crystal is then added in step (6) carry out dissolving circulation.
(10) mother solution step (9) obtained obtains with step (8) salt and the white residue that step (6) obtains mix, and then return in step (1) as dispensing alkali liquor, it is achieved alkali liquor circulates.
Wherein, described alkali red mud is the filter cake that Bayer process final wash underflow plate and frame type filter-press filter pressing obtains, and described bauxite, the granularity of limestone account for more than 85% for-0.074mm.
Preferably, in step (3), exsiccator add the flue gas that thermal medium is sintering oven, temperature is 1000～1100 DEG C.
Wherein, in step (3), grog uses Vertical Mill to dry grind, the levigate chamotte powder accounting for more than 90% (powder of below 0.074mm accounts for more than 90%) for-0.074mm.
Further, in step (6), adding desiliconization seed and carry out desiliconization, grain weight 40～60g/L, desiliconization seed is the crystal (not having seed at the operation initial stage) that desiliconization step produces.
Further, in step (6), the kind obtained with the evaporation of step (9) first step divides evaporation mother solution to adjust the composition of desiliconization solution, and causticity factor alpha k making desiliconization solution is 1.4～1.6, AL2O3Concentration is 120～140g/L.
The beneficial effects of the utility model are:
(1) problem that this utility model is difficult to process for a large amount of alkali red muds, on the basis of aluminium oxide conventional sintering method, the alkali dry-method red mud firing technology proposed, dry method firing technology is achieved from whole flow process, use and entirely plant division technique, making sintering process technological process reduce more than 1/3rd, COMPREHENSIVE CALCULATING corrosion brings up to more than 90%, and the overall recovery of aluminium oxide reaches more than 90%.Reduce operation easier, on the basis of reducing equipment and personnel's input, reduce energy consumption.
(2) this utility model achieves the breakthrough of high concentration seed precipitation solution evaporation, by two steps evaporations, salt discharge technology, solves tradition seed precipitation solution evaporation because of the problem of salt discharge difficulty restriction evaporative concn.
Accompanying drawing explanation
Fig. 1 is the structure drawing of device that this utility model processes alkali red mud.
Fig. 2 is the process chart that this utility model processes alkali red mud.
In figure, 1 be limestone storage tank, 2 be soda storage tank, 3 be bauxite storage tank, 4 be vertical mixer, 5 for feed chute, 6 be exsiccator, 7 be rotary kiln, 8 be chamotte powder dissolution groove, 9 be desilicator, 10 be vertical mill, 11 for filter press, 12 is seed precipitation tank, 13 is triple effect evaporator, and 14 is sextuple effect.
Detailed description of the invention
Now with following most preferred embodiment, this utility model is described, but is not limited to scope of the present utility model.
Embodiment 1:
See Fig. 1, a kind of dry method burns till the device of Bayer process alkali red mud, including pressure filter 11, limestone storage tank 1, soda storage tank 2, bauxite storage tank 3, vertical mixer 4, exsiccator 6, rotary kiln 7, vertical mill 10, chamotte powder dissolution groove 8, desilicator 9, seed precipitation tank 10, evaporation element；
Described bauxite storage 3, limestone storage tank 1, soda storage tank 2 are all connected to described vertical mixer 4, and described vertical mixer is also attached to the filtered solid outlet of described pressure filter 11；The discharging opening of described vertical mixer 4 is connected to described exsiccator 6, and the discharging pipeline of described exsiccator is connected with the feed chute 5 of rotary kiln 7, and the discharging opening of described rotary kiln is connected to the feed chute of described vertical mill 10；
The blow tank of described vertical mill 10 connects described chamotte powder dissolution groove 8 by pipeline, and the drain line of described chamotte powder dissolution groove 8 connects described desilicator 9, and desilicator connects described seed precipitation tank 12 by pipeline；The drain pipe road of described seed precipitation tank 12 connects described evaporation element.
Wherein, the heat medium pipeline that adds of described exsiccator is connected to the exhanst gas outlet of described rotary kiln, using the flue gas of rotary kiln as adding thermal medium dry pack.
Wherein, described evaporation element includes sextuple effect 14 (stainless steel) and the triple effect evaporator 13 being connected in series, and described sextuple effect 14 connects triple effect evaporator 13, and the drain pipe road of triple effect evaporator 13 is connected to desilicator 9.Described triple effect evaporator 13 is nickel vaporizer.
Using the device of the present embodiment, dry method is burnt till the flow process of alkali red mud and is seen Fig. 2.In raw material, alkali red mud is Xiaoyi, Shanxi factory Bayer process red mud, and raw material limestone and bauxite use ore deposit, Xiaoyi, Shanxi area, and its composition is as shown in table 1,2,3.
Table 1: alkali red mud composition
Table 2: limestone composition
Table 3: bauxite composition
First limestone (composition such as table 2) is crushed to respectively 2～5mm, then it levigate is accounted for more than 85% for-0.074mm to granularity.Then by Bayer process final wash underflow plate and frame type filter-press filter pressing, obtain alkali red mud filter cake (composition such as table 1), alkali red mud filter cake, agstone, light ash are pressed proportion scale red mud filter cake 60 mass parts, limestone 30 mass parts, bauxite powder 5 mass parts, soda 5 mass parts, it is sufficiently mixed, alkali ratio behind mixed ore deposit is 1, calcium ratio is 2, and causticity coefficient A/S is 1.2, moisture 20%.
The material prepared entering strength batch mixer be sufficiently mixed, mixing homogeneity reaches more than 98%.
To blend together material entrance exsiccator to be dried, dry flue gas is the flue gas of sintering oven, and temperature is 1000～1100 DEG C, and the material being dried enters rotary kiln and is sintered, and sintering temperature controls at 1150～1200 DEG C, and sintered clinker cooler cools down.Then grog uses Vertical Mill to dry grind, the levigate grog powder being-0.074mm particles below and accounting for more than 90%.
The chamotte powder ground adding adjustment liquid and carries out dissolution in dissolution groove, liquid-solid ratio is 4:1, and the condition of dissolution is: alkali concn Na2O 50g/L, α k=1.2, dissolution time is 20 minutes, and temperature is 75 DEG C.
After slag hot water chamotte powder dissolution obtained carries out 7 back flush, washing liquid adjusts liquid as dissolution, and slag is stored up.
After solution chamotte powder dissolution obtained and sodium aluminate crystallization mixed dissolution, dividing evaporation mother solution to adjust α k by one section of kind is 1.5, AL2O3Concentration is 120g/L, adds desiliconization seed and carries out desiliconization in desilicator.Desiliconization condition is: grain weight 60g/L, temperature 160 DEG C, and 1 hour time, after desiliconization completes, serosity leaf filter refines, and seminal fluid carries out kind point decomposing, and desiliconization slag turns one's head dispensing.
The seminal fluid adding aluminum hydroxide crystal seed that desiliconization obtains carries out kind of a point decomposition, decomposes and obtains Al (OH)3, then roasting obtains aluminium oxide.
Decomposing the seed precipitation solution obtained and be undertaken in two steps evaporation and salt discharge, it is Na that the conventional 6 effect falling film evaporators of the first step are evaporated to concentration of lye2O 280～300g/L, carries out second step evaporation salt discharge with nickel material vaporizer the most again, and obtaining concentration of lye is Na2O 500～600g/L, the salt of discharge dry after later dispensing.
Seed precipitation solution after being evaporated by second step carries out seed addition decrease temperature crystalline, obtains sodium aluminate crystal, and sodium aluminate crystal is then added in dissolution rough liquid carry out dissolving circulation.Crystallization condition is: first temperature 80 DEG C, end temperature 50 DEG C, grain weight 20g/L, 6 hours time.
The circulating mother liquor that crystallization obtains is as side-product, the liquid caustic soda raw material produced for Bayer process.
Decomposition Cycle mother solution COMPREHENSIVE CALCULATING kind point decomposition step and two steps evaporation salt discharge step obtained, corrosion can reach 90%.
Above embodiment is only to be described preferred implementation of the present utility model; not scope of the present utility model is defined; on the premise of without departing from this utility model design spirit; various modification that the technical solution of the utility model is made by this area ordinary skill technical staff and improvement, all should fall in the protection domain that claims of the present utility model determine.
Claims (4)
1. a dry method burns till the device of Bayer process alkali red mud, it is characterized in that, including pressure filter, limestone storage tank, soda storage tank, bauxite storage tank, vertical mixer, exsiccator, rotary kiln, vertical mill, chamotte powder dissolution groove, desilicator, seed precipitation tank, evaporation element；
Described bauxite storage tank, limestone storage tank, soda storage tank are all connected to described vertical mixer, and described vertical mixer is also attached to the outlet of described cake of filter-press；The discharging opening of described vertical mixer is connected to described exsiccator, and the discharging pipeline of described exsiccator is connected with the feed chute of rotary kiln, and the discharging opening of described rotary kiln is connected to the feed chute of described vertical mill；
The blow tank of described vertical mill connects described chamotte powder dissolution groove by pipeline, and the drain line of described chamotte powder dissolution groove connects described desilicator, and desilicator connects described seed precipitation tank by pipeline；The drain pipe road of described seed precipitation tank connects described evaporation element.
Device the most according to claim 1, it is characterised in that the heat medium pipeline that adds of described exsiccator is connected to the exhanst gas outlet of described rotary kiln.
Device the most according to claim 1, it is characterised in that described evaporation element includes sextuple effect and the triple effect evaporator being connected in series, described sextuple effect connects described triple effect evaporator, and the drain pipe road of triple effect evaporator is connected to described desilicator.
Device the most according to claim 3, it is characterised in that described triple effect evaporator is nickel vaporizer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620118527.9U CN205590316U (en) | 2016-02-06 | 2016-02-06 | Device of bayer process alkali red mud is burnt till to dry process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108083294A (en) * | 2018-02-12 | 2018-05-29 | 沈阳鑫博工业技术股份有限公司 | A kind of device and method that aluminium oxide and sodium oxide molybdena are extracted from red mud |
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2016
- 2016-02-06 CN CN201620118527.9U patent/CN205590316U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108083294A (en) * | 2018-02-12 | 2018-05-29 | 沈阳鑫博工业技术股份有限公司 | A kind of device and method that aluminium oxide and sodium oxide molybdena are extracted from red mud |
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