CN112169971A - Method for recovering aluminum in primary aluminum ash - Google Patents
Method for recovering aluminum in primary aluminum ash Download PDFInfo
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- CN112169971A CN112169971A CN202010835064.9A CN202010835064A CN112169971A CN 112169971 A CN112169971 A CN 112169971A CN 202010835064 A CN202010835064 A CN 202010835064A CN 112169971 A CN112169971 A CN 112169971A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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Abstract
The invention relates to a method for recovering aluminum in primary aluminum ash. A method for recovering aluminum in primary aluminum ash comprises the following steps: crushing the primary aluminum ash to separate out metal aluminum with the granularity larger than 5 meshes, and taking the rest as screen dust 1; crushing the sieved ash 1 to separate out metal aluminum with the granularity larger than 20 meshes, and the rest is sieved ash 2; classifying the screened ash 2 by a vibrating screen into fine ash of 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes; grinding the classified fine ash respectively, and sieving to obtain metal aluminum and secondary aluminum ash; the secondary aluminum ash enters a comprehensive utilization treatment process of the secondary aluminum ash; and after the metal aluminum is sieved out, smelting the metal aluminum into aluminum ingots. The invention relates to a method for recovering aluminum from primary aluminum ash, which comprises the steps of extracting aluminum from the primary aluminum ash by a high-speed hammer crusher and a low-speed hammer crusher, classifying the aluminum ash by a vibrating screen, adjusting the gap between a pair of roller crushers, and correspondingly performing processes such as separation of extrusion crushing and the like to improve the recovery rate of the aluminum from the aluminum ash.
Description
Technical Field
The invention particularly relates to a method for recovering aluminum in primary aluminum ash.
Background
Since metallic aluminum is very easily oxidized, a large amount of aluminum ash is generated by the contact reaction of molten aluminum and oxygen in a furnace during the production of electrolytic aluminum. The aluminum ash mainly contains aluminum oxide, metallic aluminum, carbide, nitride, salt and other metal oxides. The existing aluminum processing enterprises generally add slag aluminum separating agent into a smelting furnace, take the aluminum ash out, place the aluminum ash which is just taken out in an iron pan by using an ash frying process, the bottom of the iron pan is provided with a small hole, the aluminum ash is manually fried by using a shovel, the temperature of the aluminum ash is raised by means of oxidation and heat release of active metal, because the wettability of aluminum melt particles and the aluminum ash is poor, aluminum melt (particles) gradually collects at the bottom of the iron pan and then flows out in the frying process, and the rest aluminum flows along with the aluminum ash flow direction to the enterprises engaged in aluminum ash processing, and the really recoverable aluminum can only account for about 10 percent of the weight of the aluminum ash. And (3) ball-milling the cold aluminum ash and the hot aluminum ash passing through an ash frying machine, and sieving to obtain metal aluminum and secondary aluminum ash, wherein the secondary aluminum ash is discarded as industrial waste residue.
However, the secondary aluminum ash still contains metallic aluminum with a content of about 9.62%. Therefore, the recovery efficiency of the existing primary aluminum ash treatment process is low, and the phenomenon of metal aluminum waste exists. And this practice also has the following problems: a large amount of toxic smoke is generated in the production process, a large amount of soluble salts exist in the treated waste residue, the subsequent treatment is difficult, the secondary pollution is serious, the labor intensity is high, the environmental pollution is serious, and industrial injury is easy to cause.
In the prior art, a production line for separating aluminum from aluminum slag and aluminum ash comprises a jaw crusher, a fourth belt conveyor, and a first belt conveyor, a first aluminum ash ball mill, a first large-inclination-angle conveyor, a first aluminum ash separating unit, a second large-inclination-angle conveyor, an intermediate bin, a second aluminum ash ball mill, a third large-inclination-angle conveyor and a second aluminum ash separating unit which are sequentially arranged; the feeding end of the first belt conveyor is positioned below the discharge port of the jaw crusher; a second belt conveyor is arranged between the first aluminum ash separating unit and the fourth belt conveyor; a third belt conveyor is arranged between the second aluminum ash separating unit and the fourth belt conveyor, and a vibrating screen is arranged beside the second aluminum ash separating unit; the discharge end of the fourth belt conveyor is positioned above the feed end of the fifth belt conveyor, and the discharge end of the fifth belt conveyor is positioned above the feed inlet of the waste ash bin. A series of treatments are carried out on the large aluminum slag through the production line to obtain aluminum and aluminum ash, so that the recovery of the aluminum is realized, the labor cost is saved, and the working environment is improved. However, although the technology improves the automation of the aluminum ash treatment process and saves the labor cost, the process flow is complex and the cost is high, and the aluminum particles and the ash particles in the fine aluminum ash after passing through the crusher and the ball mill cannot be well separated.
The method for recycling aluminum ash in the prior art comprises the following steps: and (3) deamination treatment: mixing aluminum ash powder and water or an alkali solution according to a certain mass ratio, generating ammonia gas in the mixing process, absorbing the ammonia gas by strong acid through an absorption tower to prepare ammonium salt, and conveying the mixed pulp to a pressurized reaction kettle through a pump; preparing alumina: and according to different contents of metal aluminum in the aluminum ash, carrying out acid washing on the ore pulp, then adding an alkali solution or alkali washing, then adding an acid solution for treatment to generate a precipitate, filtering, calcining the precipitate to form aluminum oxide powder, and heating and concentrating the filtrate to obtain the industrial salt. According to the technical scheme that this application provides retrieves the recycle to the aluminium ash, useful component in the recovery aluminium ash that can furthest avoids aluminium ash processing to the pollution of environment simultaneously, and the ammonia of retrieving can directly be used for electrolytic aluminium or the flue gas desulfurization denitration of aluminium processing enterprise, has realized innoxious, resourceization and the benefit that the aluminium ash was handled. However, the utilization of the aluminum ash by the technology cannot maximize the benefit, after the aluminum ash is subjected to size mixing, the aluminum ash is firstly subjected to acid washing, then the alkali solution or the alkali washing is added, then the acid solution is added for treatment to generate precipitation and filtration, and the precipitation is calcined to form the aluminum oxide powder, wherein the aluminum in the aluminum ash is wasted, the process is complex, the cost is high, and the additional value of the produced product is not high.
In view of the above, the invention provides a novel method for recovering aluminum from primary aluminum ash, which is more thorough in recovering aluminum from primary aluminum ash, simple in recovery process and low in cost.
Disclosure of Invention
The invention aims to provide a method for recovering aluminum in primary aluminum ash, which adopts a combination of a high-speed hammer crusher and a low-speed hammer crusher and three-stage crushing of a pair of roller mills, can more completely utilize the primary aluminum ash, improves the recovery rate of metal aluminum, and has less abrasion to the aluminum.
In order to realize the purpose, the adopted technical scheme is as follows:
a method for recovering aluminum in primary aluminum ash comprises the following steps:
crushing the primary aluminum ash to separate out metal aluminum with the granularity larger than 5 meshes, and taking the rest as screen dust 1;
crushing the sieved ash 1 to separate out metal aluminum with the granularity larger than 20 meshes, and the rest is sieved ash 2;
classifying the screened ash 2 by a vibrating screen into fine ash of 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes; grinding the fine ash of 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes respectively, and sieving to obtain metal aluminum, wherein the sieved ash is secondary aluminum ash;
the secondary aluminum ash enters a comprehensive utilization treatment process of the secondary aluminum ash;
and after the metal aluminum is sieved out, smelting the metal aluminum into aluminum ingots.
Further, the grinding adopts a double-roll crusher.
And further, feeding the fine ash of 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes into a double-roll crusher, adjusting the gap of the double-roll crusher to be 0.4mm, 0.3mm, 0.2mm and 0.1mm, and correspondingly treating the fine ash of 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes.
Further, the primary aluminum ash and the undersize ash 1 are crushed by a hammer crusher.
Further, crushing the primary aluminum ash at a low speed; and the screened ash 1 is crushed at high speed.
Still further, the rotating speed of the low-speed crushing is 550-750r/min, and the rotating speed of the high-speed crushing is 750-1100 r/min.
And further, classifying the screened ash 2 by using a vibrating screen, and feeding the separated fine ash with the mesh of not less than 80 into a secondary aluminum ash comprehensive utilization treatment process.
Compared with the prior art, the invention has the beneficial effects that:
the recovery rate of the aluminum in the aluminum ash is about 80-85% by the prior art method, and the residual aluminum cannot be recovered and effectively utilized. The invention improves the recovery rate of aluminum in the aluminum ash by reasonably utilizing the modes of impact crushing and double-roller crushing, and has less abrasion to the aluminum. Compared with the traditional production process, the recovery rate of the aluminum is improved by 5-10%, the waste is reduced, the benefit is increased, the metal aluminum in the aluminum ash can be efficiently separated from the ash phase of the non-metal impurities, and the efficient recovery of the aluminum in the primary aluminum ash is realized.
Drawings
FIG. 1 is a process flow diagram of examples 1-3.
Detailed Description
In order to further illustrate the method for recycling aluminum from primary aluminum ash of the present invention to achieve the desired objects, the following embodiments are provided to explain the method for recycling aluminum from primary aluminum ash according to the present invention, and the detailed description thereof, the structure thereof, the features thereof, and the effects thereof will be given below. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The method for recovering aluminum from primary aluminum ash according to the present invention will be described in further detail with reference to specific examples and with reference to the flow chart of fig. 1:
according to the invention, through observation and analysis of a production sample, the secondary aluminum ash is found to contain very fine (capable of passing through an 80-mesh screen) aluminum particles, and the secondary aluminum ash is difficult to separate from the aluminum ash and recover. The reason for forming these fine aluminum particles is due to the ball mill. In consideration of the fact that the existing primary aluminum ash treatment technology cannot completely utilize the primary aluminum ash, resource waste is caused, and a new treatment mode is researched and developed to improve the recovery rate of the metal aluminum in the primary aluminum ash. The technical scheme is as follows:
a method for recovering aluminum in primary aluminum ash comprises the following steps:
crushing the primary aluminum ash to separate out metal aluminum with the granularity larger than 5 meshes, and taking the rest as screen dust 1;
crushing the sieved ash 1 to separate out metal aluminum with the granularity larger than 20 meshes, and the rest is sieved ash 2;
classifying the screened ash 2 by a vibrating screen into fine ash of 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes; grinding the fine ash of 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes respectively, and sieving to obtain metal aluminum, wherein the sieved ash is secondary aluminum ash;
the secondary aluminum ash enters a comprehensive utilization treatment process of the secondary aluminum ash;
and after the metal aluminum is sieved out, smelting the metal aluminum into aluminum ingots.
The fine ash obtained after screening by the high-speed and low-speed crushers is separated into aluminum ash with different meshes by the screening machine due to the similar granularity of the ash and the metal aluminum, and then enters the double-roll crusher, and the gap between the double-roll crusher is correspondingly adjusted according to the aluminum ash with different granularities. After grinding, the ash is ground into a powder. Aluminum is not ground due to its physical properties, but is compressed into a flat shape. And separating aluminum from ash in the fine ash by screening to obtain crushed aluminum for recycling, wherein secondary aluminum ash is screened, and the secondary aluminum ash is subjected to harmless treatment and resource utilization of useful substances in the secondary aluminum ash by a corresponding treatment process.
Preferably, the grinding is performed by a double-roll crusher.
A roll crusher (a double roll crusher) is a machine that bites a material into a crushing zone by using a frictional force of a roll surface to subject the material to crushing by pressing or splitting. Roller crushers are generally classified into single roller, double roller and multi-roller crushers according to the number of rollers, and the double roller is selected in the present invention. The aluminum and the ash are separated due to the difference in physical properties, the ash is pulverized, and the aluminum is pressed into a flat shape. The double-roller crusher can well achieve the technical effect.
Further preferably, the fine ash with 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes is put into a double-roll crusher, the gap of the double-roll crusher is adjusted to be 0.4mm, 0.3mm, 0.2mm and 0.1mm, and the fine ash with 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes is correspondingly processed.
Adjusting the gap of the double-roll crusher to be 0.4mm, 0.3mm, 0.2mm and 0.1mm, and correspondingly processing fine ash below a sieve with 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes; the fine ash enters the corresponding double-roll crusher to reduce the abrasion of the metal aluminum and improve the recovery rate of the aluminum. The ground ash is ground into powder, the aluminum is pressed into a flat shape, the separation of the aluminum and the ash in the fine ash is achieved after secondary screening, and the abrasion to the aluminum is small.
Preferably, the primary aluminum ash and the undersize ash 1 are crushed by a hammer crusher.
The hammer crusher is a crushing machine which utilizes the high-speed impact action of a hammer head to carry out medium crushing and fine crushing operation on materials. The hammer is hinged on the rotor rotating at high speed, and the lower part of the machine body is provided with a grate bar to control the granularity of discharged materials. The material fed into the crusher is firstly impacted by the hammer head moving at high speed to be crushed for the first time, and simultaneously obtains kinetic energy, and the kinetic energy flies to the crushing plate on the inner wall of the shell at high speed to be crushed again. The material smaller than the gap of the grate bar is discharged out of the machine, and the material block larger than the gap of the grate bar is impacted and ground by the hammer on the grate bar again until the material block is smaller than the gap of the grate bar and then discharged. Therefore, the hammer crusher has the advantages of large crushing ratio, uniform discharge particle size, less over-crushed materials, low energy consumption and the like. The invention adds small sorting on the basis, and the granularity grading effect is better.
Further preferably, the primary aluminum ash is crushed at a low speed; and the screened ash 1 is crushed at high speed.
The primary aluminum ash is screened out of larger metal aluminum particles by a primary low-speed hammer crusher, and then enters a secondary high-speed hammer crusher for crushing, so that finer metal aluminum particles are screened, the amount of aluminum ground is reduced, and the recovery rate of aluminum is increased.
Further preferably, the rotation speed of the low-speed crushing is 550-750r/min, and the rotation speed of the high-speed crushing is 750-1100 r/min.
Preferably, the screened ash 2 is classified by a vibrating screen, and the separated fine ash with the mesh of not less than 80 meshes enters a comprehensive utilization treatment process of secondary aluminum ash.
Example 1.
With reference to fig. 1, the specific operation steps are as follows:
(1) the primary aluminum ash firstly enters a first-stage low-speed hammer crusher for crushing, the rotating speed is 650r/min, metal aluminum with the granularity larger than 5 meshes is separated, and the rest is screen dust 1.
(2) And then feeding the sieved ash into a secondary high-speed hammer crusher at the rotating speed of 900r/min, separating out metal aluminum with the granularity larger than 20 meshes, and taking the rest as sieved ash 2.
(3) The screened ash 2 enters a vibrating screen for classification and is roughly divided into fine ash with different granularities, such as 20-30 meshes, 30-40 meshes, 40-60 meshes, 60-80 meshes and the like. The aluminum ash with the granularity of more than 80 meshes (containing 5.18 percent of aluminum) enters a comprehensive utilization treatment process of secondary aluminum ash.
(4) Adjusting the gap of the double-roll crusher to be 0.4mm, 0.3mm, 0.2mm and 0.1mm, and correspondingly processing fine ash below a sieve with 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes. Wherein, the aluminum recovery on the 20-30 mesh sieve is aluminum ash (the aluminum content is 4.59 percent) under the sieve, the aluminum recovery on the 30-40 mesh sieve is aluminum ash (the aluminum content is 2.09 percent) under the sieve, the aluminum recovery on the 40-60 mesh sieve is aluminum ash (the aluminum content is 2.38 percent) under the sieve, the aluminum recovery on the 60-80 mesh sieve is aluminum ash (the aluminum content is 2.07 percent) under the sieve.
The fine ash enters a corresponding double-roll crusher to reduce the abrasion of metal aluminum and improve the recovery rate of aluminum, the ground ash is ground into powder, the aluminum is pressed into a flat shape, the separation of aluminum and ash in the fine ash is achieved after secondary screening, the obtained crushed aluminum is smelted into aluminum ingots, the screened ash is secondary aluminum ash, and the secondary aluminum ash is subjected to a comprehensive utilization treatment process of the secondary aluminum ash.
Finally, after accounting, the aluminum content in the aluminum ash treated by the improved process is 4.97 percent, namely the recovery rate of aluminum is 95.03 percent. Compared with the prior art, the recovery rate of the metal aluminum is improved by at least 10 percent.
Example 2.
With reference to fig. 1, the specific operation steps are as follows:
(1) the primary aluminum ash firstly enters a first-stage low-speed hammer crusher to be crushed at the rotating speed of 550r/min, metal aluminum with the granularity larger than 5 meshes is separated, and the rest is screen dust 1.
(2) And then feeding the sieved ash into a secondary high-speed hammer crusher at the rotating speed of 750r/min, separating out metal aluminum with the granularity larger than 20 meshes, and taking the rest as sieved ash 2.
(3) The screened ash 2 enters a vibrating screen for classification and is roughly divided into fine ash with different granularities, such as 20-30 meshes, 30-40 meshes, 40-60 meshes, 60-80 meshes and the like. The aluminum ash with the granularity of more than 80 meshes (containing 5.18 percent of aluminum) enters a comprehensive utilization treatment process of secondary aluminum ash.
(4) Adjusting the gap of the double-roll crusher to be 0.4mm, 0.3mm, 0.2mm and 0.1mm, and correspondingly processing fine ash below a sieve with 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes; wherein, the aluminum recovery on the 20-30 mesh sieve is aluminum ash (aluminum content is 4.71 percent) under the sieve, the aluminum recovery on the 30-40 mesh sieve is aluminum ash (aluminum content is 2.12 percent) under the sieve, the aluminum recovery on the 40-60 mesh sieve is aluminum ash (aluminum content is 2.37 percent) under the sieve, the aluminum recovery on the 60-80 mesh sieve is aluminum ash (aluminum content is 2.11 percent) under the sieve.
The undersize aluminum ash is secondary aluminum ash, and enters a comprehensive utilization treatment process of the secondary aluminum ash; after the metallic aluminum is screened out, the metallic aluminum is smelted into aluminum ingots.
Finally, after accounting, the aluminum content in the aluminum ash treated by the improved process is 5.08 percent, namely the recovery rate of aluminum is 94.92 percent.
Example 3.
With reference to fig. 1, the specific operation steps are as follows:
(1) the primary aluminum ash firstly enters a first-stage low-speed hammer crusher to be crushed at the rotating speed of 750r/min, metal aluminum with the granularity larger than 5 meshes is separated, and the rest is screen dust 1.
(2) And then feeding the sieved ash into a secondary high-speed hammer crusher at the rotating speed of 1100r/min, separating out metal aluminum with the granularity larger than 20 meshes, and taking the rest as sieved ash 2.
(3) The screened ash 2 enters a vibrating screen for classification and is roughly divided into fine ash with different granularities, such as 20-30 meshes, 30-40 meshes, 40-60 meshes, 60-80 meshes and the like. The aluminum ash with the granularity of more than 80 meshes (containing 5.18 percent of aluminum) enters a comprehensive utilization treatment process of secondary aluminum ash.
(4) Adjusting the gap of the double-roll crusher to be 0.4mm, 0.3mm, 0.2mm and 0.1mm, and correspondingly processing fine ash below a sieve with 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes; wherein, the aluminum recovery on the 20-30 mesh sieve is aluminum ash (aluminum content is 4.65 percent) under the sieve, the aluminum recovery on the 30-40 mesh sieve is aluminum ash (aluminum content is 2.10 percent) under the sieve, the aluminum recovery on the 40-60 mesh sieve is aluminum ash (aluminum content is 2.39 percent) under the sieve, the aluminum recovery on the 60-80 mesh sieve is aluminum ash (aluminum content is 2.10 percent) under the sieve.
The undersize aluminum ash is secondary aluminum ash, and enters a comprehensive utilization treatment process of the secondary aluminum ash; after the metallic aluminum is screened out, the metallic aluminum is smelted into aluminum ingots.
Finally, after accounting, the aluminum content in the aluminum ash treated by the improved process is 5.03 percent, namely the recovery rate of aluminum is 94.97 percent.
According to the method for recovering aluminum in the primary aluminum ash, the primary aluminum ash is subjected to two-stage crushing, and most of metal aluminum is separated; in order to further recover aluminum, a vibrating screen is designed for carrying out grading treatment on aluminum ash, and different crushing and extruding gaps are adjusted according to aluminum ash with different particle sizes by utilizing the characteristic of adjustable gap of a double-roll crusher, so that a better separation effect is achieved. Thereby can separate the ash and the aluminium that mix with in the ash and the aluminium on aluminium surface, and the fine ash of roll crusher, can not cause too much metallic aluminum's wearing and tearing, when having improved metallic aluminum's rate of recovery to wearing and tearing to aluminium are less.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (7)
1. A method for recovering aluminum in primary aluminum ash is characterized by comprising the following steps:
crushing the primary aluminum ash to separate out metal aluminum with the granularity larger than 5 meshes, and taking the rest as screen dust 1;
crushing the sieved ash 1 to separate out metal aluminum with the granularity larger than 20 meshes, and the rest is sieved ash 2;
classifying the screened ash 2 by a vibrating screen into fine ash of 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes; grinding the fine ash of 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes respectively, and sieving to obtain metal aluminum, wherein the sieved ash is secondary aluminum ash;
the secondary aluminum ash enters a comprehensive utilization treatment process of the secondary aluminum ash;
and after the metal aluminum is sieved out, smelting the metal aluminum into aluminum ingots.
2. The recycling method according to claim 1,
the grinding adopts a double-roller crusher.
3. The recycling method according to claim 2,
the fine ash with 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes is put into a double-roll crusher, the gap of the double-roll crusher is adjusted to be 0.4mm, 0.3mm, 0.2mm and 0.1mm, and the fine ash with 20-30 meshes, 30-40 meshes, 40-60 meshes and 60-80 meshes is correspondingly processed.
4. The recycling method according to claim 1,
and the primary aluminum ash and the undersize ash 1 are crushed by a hammer crusher.
5. The recycling method according to claim 3,
the primary aluminum ash is crushed at a low speed; and the screened ash 1 is crushed at high speed.
6. The recycling method according to claim 4,
the rotating speed of the low-speed crushing is 550-750r/min, and the rotating speed of the high-speed crushing is 750-1100 r/min.
7. The recycling method according to claim 1,
and (3) classifying the screened ash 2 by using a vibrating screen, and feeding the separated fine ash with the particle size not less than 80 meshes into a secondary aluminum ash comprehensive utilization treatment process.
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| CN113237717A (en) * | 2021-05-10 | 2021-08-10 | 攀钢集团西昌钢钒有限公司 | Improved high-aluminum slag modifier sample preparation method |
| CN114058858A (en) * | 2021-11-16 | 2022-02-18 | 秦皇岛信宝资源循环科技有限公司 | Method for harmlessly treating and recycling aluminum ash |
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