CN217398467U - System capable of improving decomposition rate of alumina seed - Google Patents
System capable of improving decomposition rate of alumina seed Download PDFInfo
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- CN217398467U CN217398467U CN202221429206.2U CN202221429206U CN217398467U CN 217398467 U CN217398467 U CN 217398467U CN 202221429206 U CN202221429206 U CN 202221429206U CN 217398467 U CN217398467 U CN 217398467U
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Abstract
The utility model discloses a system capable of improving alumina seed decomposition rate, it subsides the device including arranging salt, subsides the device front end at row salt and is connected with and forces row salt device and alkali discharge salt device, subsides the device rear end at row salt and has connected gradually row salt filter equipment, causticization device and filtering separation device, its characterized in that: the device is characterized in that a causticized liquid feeding branch pipe connected to a sodium aluminate seed decomposition system is arranged on a filtering and separating device, a calandria connected to an aluminum hydroxide seed crystal separating device is arranged on a tail groove of the sodium aluminate seed decomposition system, a calandria connected to a decomposition mother liquor system and a seed crystal chute connected to a primary groove or a secondary groove of the sodium aluminate seed decomposition system are arranged on the aluminum hydroxide seed crystal separating device, and a refined sodium aluminate solution feeding pipe is arranged on the seed crystal chute; the utility model discloses utilize the characteristic that the desalinization liquid has low caustic concentration and high caustic ratio, divide the decomposition rate to promote Bayer process seed precipitation and have important contribution, can break through current seed precipitation decomposition rate level, be favorable to Bayer process sodium aluminate solution seed crystal to decompose, improve seed precipitation and decomposition rate.
Description
Technical Field
The utility model relates to a system capable of improving the decomposition rate of alumina seeds, which belongs to the technical field of alumina production.
Background
As the resources of the bauxite ore are gradually depleted, the content of impurities in the ore is gradually increased, and particularly the content of impurities such as carbon, sulfur and the like in the ore is increased to have serious influence on the production process of the alumina. Carbon in bauxite mainly exists in the form of carbonate, and during the production process of alumina by a Bayer process, the carbonate in the bauxite is formed by sodium carbonate and enters a sodium aluminate solution, so that the concentration of sodium carbonate in the sodium aluminate solution is gradually increased, the physical property change of the sodium aluminate solution is caused, the technological links such as dissolution, evaporation and decomposition are seriously influenced, the system cannot stably operate, the production of alumina is reduced, even the production is stopped, the consumption of the system is increased, and the production cost is increased. The rising of the concentration of sodium carbonate can cause the material property of the sodium aluminate solution to change, particularly can cause the viscosity of the sodium aluminate solution to rise, and influence the mass transfer driving force in the seed precipitation decomposition process, thereby reducing the decomposition rate of alumina seed precipitation, leading to low system circulation efficiency, further reducing the production operation efficiency, and increasing the system consumption and the production cost. The balance of the sodium carbonate concentration of the system must be realized by a salt discharge causticization process after the sodium carbonate concentration in the sodium aluminate solution rises, a large amount of causticized liquid is generated in the salt discharge causticization process, the causticized liquid directly enters a red mud sedimentation washing system to cause the increase of the concentrate quantity of the system, the transportation load of the concentrate system is increased, the decomposition time is shortened, and the concentrate causticization ratio alpha k is also caused, which is not favorable for improving the seed decomposition rate, and particularly, the liquid quantity of the causticization system is more remarkably increased along with the gradual rise of carbon content of ore. In order to solve the practical problem of low seed separation rate of the alumina production system under high carbon alkali, the applicant believes that the seed separation rate still has room for improvement based on years of work experience.
Namely: the existing aluminum oxide production system for improving the decomposition rate of the decomposition tank is needed, the existing decomposition level is broken through, and the seed crystal decomposition of the decomposition system is facilitated.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a system capable of increasing the decomposition rate of alumina seeds, which breaks through the existing decomposition level and is beneficial to the decomposition of the seed crystal in the decomposition tank; the defects of the prior art can be overcome.
The utility model aims at realizing through the following technical scheme:
the utility model discloses a system for can improve aluminium oxide and divide decomposition rate, it subsides the device including arranging the salt, subsides the device front end at row salt and is connected with and forces row salt device and change alkali and arrange the salt device, subsides the device rear end at row salt and has connected gradually row salt filter equipment, causticization device and filtering separation device, its characterized in that: the device is characterized in that a causticized liquid feeding branch pipe connected to a sodium aluminate seed decomposition system is arranged on the filtering and separating device, a calandria is arranged on a tail groove of the sodium aluminate seed decomposition system and is connected to an aluminum hydroxide seed crystal separating device, a calandria connected to a decomposition mother liquor system and a seed crystal chute connected to a primary groove or a secondary groove of the sodium aluminate seed decomposition system are arranged on the aluminum hydroxide seed crystal separating device, and a refined sodium aluminate solution feeding pipe is arranged on the seed crystal chute.
And the causticizing liquid feeding branch pipes are arranged on the sodium aluminate seed decomposition system.
In the foregoing, a flow meter and an automatic control valve are provided on the causticized liquid feeding branch pipe.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses an add the causticization liquid feed branch pipe that is connected to sodium aluminate seed decomposition system on row salt causticization filter separation device, can send the causticization liquid to sodium aluminate seed decomposition system, row salt causticization liquid has the characteristic of low caustic concentration and high caustic ratio, caustic concentration is generally at 40-100g/L, caustic ratio alpha k50-200, this material property has important contribution to promoting Bayer process seed decomposition rate, can strengthen the power that Bayer process sodium aluminate solution seed crystal decomposes, improve seed decomposition rate.
2. The addition amount of the causticizing liquid is 0-20% (volume ratio) of the amount of the concentrate, and the decomposition rate of the alumina seed precipitation by the Bayer process can be improved by 0-6%.
3. The flow meter and the automatic valve are favorable for accurately controlling the addition amount of the causticizing liquid, and the amount of the causticizing slurry introduced into the decomposing tank is convenient to control.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, wherein:
fig. 1 is a schematic view of the three-dimensional connection structure of the present invention.
Wherein, the salt removing and settling device 1; a forced salt discharging device 2; a soda removal and salt discharge device 3; a causticizing device 4; a filtration and separation device 5; a sodium aluminate seed decomposition system 6; an aluminum hydroxide seed crystal separation device 7; a mother liquor system 8; a sodium aluminate semen replenishing pipe 9; a salt discharge filter device 10.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for purposes of illustration only and are not intended to limit the scope of the present invention.
As shown in figure 1, the utility model discloses a can improve system of aluminium oxide branch decomposition rate, it subsides device 1 including arranging the salt, subsides 1 front end at row salt and is connected with and forces row salt device 2 and alkali discharge salt device 3, subsides 1 rear end at row salt and has connected gradually row salt filter equipment 10, causticization device 4 and filtering separation device 5, its characterized in that: the filtering and separating device 5 is provided with a causticized liquid feeding branch pipe connected to a sodium aluminate decomposition system 6, a tail groove of the sodium aluminate decomposition system 6 is provided with a calandria connected to an aluminum hydroxide crystal seed separation device 7, the aluminum hydroxide crystal seed separation device 7 is provided with a calandria connected to a decomposition mother liquor system 8 and a crystal seed chute 11 connected to a first groove or a second groove of the sodium aluminate decomposition system 6, the crystal seed chute 11 is provided with a refined sodium aluminate solution feeding pipe 9, the causticized liquid feeding branch pipes are arranged on the sodium aluminate decomposition system 6, the causticized liquid feeding branch pipes are provided with a flow meter and an automatic control valve, the device adds causticized liquid generated by the causticized system into the refined sodium aluminate solution decomposition system (6), the added causticized liquid caustic concentration is 30-100g/L, the caustic ratio alpha is 30-200, the caustic concentration of the refined sodium aluminate solution is 150-, the caustic ratio alpha k is 1.38-1.50, the decomposition initial temperature of the sodium aluminate decomposition system (6) is 58-63 ℃, the decomposition final temperature is 45-50 ℃, and the decomposition time is 40-50 h.
The causticizing liquid is added into the sodium aluminate seed decomposition system 6 through the causticizing liquid feeding branch pipe, and the decomposition effect of the sodium aluminate seed decomposition system 6 is as follows:
in test 1, the caustic concentration of the causticized liquid is 54g/L, the caustic ratio (alpha k) is 45.79, the causticized liquid is added into the first decomposition tank, the addition proportion of the causticized liquid is 4 percent, and the decomposition rate of the Bayer process seed separation is improved by 2.92 percent compared with the decomposition rate without adding the causticized liquid.
Experiment 2 caustic concentration of the causticized liquid was 44g/L, caustic ratio (α k) was 66.44, the causticized liquid was added to the decomposition intermediate tank at a causticized liquid addition rate of 4%, and the bayer process seed decomposition rate was increased by 2.34% compared to when no causticized liquid was added.
Experiment 3 caustic concentration of the causticized liquid is 54g/L, caustic ratio (alpha k) is 45.79, the causticized liquid is added into the first decomposition tank, the adding proportion of the causticized liquid is 10%, and the decomposition rate of the Bayer process seed separation is improved by 6% compared with that when the causticized liquid is not added.
Experiment 4 caustic concentration of the causticized liquid is 44g/L, caustic ratio (alpha k) is 66.44, the causticized liquid is added into the decomposition intermediate tank, the adding proportion of the causticized liquid is 10%, and the decomposition rate of the Bayer process seed separation is improved by 4.65% compared with that when the causticized liquid is not added.
Through the test data, the causticized liquid is added into the sodium aluminate seed decomposition system 6 through the causticized liquid feeding branch pipe, the decomposition rate of the Bayer process seed decomposition is obviously improved, the existing decomposition level is broken through, and the decomposition of the crystal seeds in the decomposition tank is facilitated.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any form, which is confidential, and any simple modification, equivalent change and modification made by the technical entity of the present invention to the above embodiments do not depart from the technical solution of the present invention.
Claims (3)
1. The utility model provides a can improve system of aluminium oxide branch decomposition rate, it includes row's salt and subsides device (1), subsides device (1) front end at row's salt and is connected with and forces row's salt device (2) and change alkali and arrange salt device (3), subsides device (1) rear end at row's salt and has connected gradually row's salt filter equipment (10), causticization device (4) and filtering separation device (5), its characterized in that: be equipped with the causticized liquid feeding branch pipe that is connected to sodium aluminate seed decomposition system (6) on filtering separator (5), be equipped with the calandria on the kerve of sodium aluminate seed decomposition system (6) and be connected to aluminium hydroxide seed crystal separator (7), be equipped with the calandria that is connected to decomposition mother liquor system (8) and be connected to the seed crystal chute (11) of the first groove of sodium aluminate seed decomposition system (6) or first groove of time on aluminium hydroxide seed crystal separator (7), be provided with refined sodium aluminate solution inlet tube (9) on seed crystal chute (11).
2. The system capable of increasing the decomposition rate of alumina seeds according to claim 1, wherein: and causticized liquid feeding branch pipes are arranged on the sodium aluminate seed decomposition system (6).
3. The system capable of increasing decomposition rate of alumina seeds according to claim 1, wherein: a flow meter and an automatic control valve are arranged on the causticized liquid feeding branch pipe.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114873617A (en) * | 2022-06-09 | 2022-08-09 | 贵州华锦铝业有限公司 | Method and system capable of improving decomposition rate of alumina seed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114873617A (en) * | 2022-06-09 | 2022-08-09 | 贵州华锦铝业有限公司 | Method and system capable of improving decomposition rate of alumina seed |
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