阅读说明：本技术 一种废铝回收前处理工艺 (Waste aluminum recovery pretreatment process ) 是由 杨勇 张枫 张育玮 田莉 于 2019-09-28 设计创作，主要内容包括：本发明公开了一种废铝回收前处理工艺,涉及废铝处理技术领域,包括以下步骤：(1)采用永久磁铁对废铝屑进行吸附处理；(2)采用过滤筛对上述处理后的废铝屑进行过筛处理；(3)将过筛后的废铝屑添加到清洗罐中,向清洗罐中添加清洗液,加热至70-80℃,以350r/min转速搅拌40min,然后再进行超声处理10-12min,然后进行过滤；(4)对上述过滤后的废铝屑进行干燥至恒重,然后再进行压制,得到铝饼,即可；本发明对废铝回收前处理能够更好的清除废铝表面污渍和杂质,提高纯净度。(The invention discloses a waste aluminum recovery pretreatment process, which relates to the technical field of waste aluminum treatment and comprises the following steps: (1) adopting a permanent magnet to adsorb the waste aluminum scraps; (2) screening the treated aluminum scraps by using a filter screen; (3) adding the sieved aluminum scraps into a cleaning tank, adding cleaning liquid into the cleaning tank, heating to 70-80 ℃, stirring at the rotating speed of 350r/min for 40min, then carrying out ultrasonic treatment for 10-12min, and then filtering; (4) drying the filtered waste aluminum scraps to constant weight, and then pressing to obtain an aluminum cake; the invention can better remove stains and impurities on the surface of the aluminum scrap before the aluminum scrap is subjected to recovery pretreatment, and improve the purity.)

1. A pretreatment process for aluminum scrap recovery is characterized by comprising the following steps:

(1) adopting a permanent magnet to adsorb the waste aluminum scraps;

(2) screening the treated aluminum scraps by using a filter screen;

(3) adding the sieved aluminum scraps into a cleaning tank, adding cleaning liquid into the cleaning tank, heating to 70-80 ℃, stirring at the rotating speed of 350r/min for 40min, then carrying out ultrasonic treatment for 10-12min, and then filtering;

(4) and drying the filtered waste aluminum scraps to constant weight, and then pressing to obtain an aluminum cake.

2. The process of claim 1, wherein the permanent magnet is used to adsorb the aluminum scraps, and the permanent magnet is used to remove iron filings and iron wires from the aluminum scraps, and the large impurities in the aluminum scraps can be removed manually.

3. The waste aluminum recovery pretreatment process as claimed in claim 2, wherein the large particle impurities comprise: sand, wood blocks, copper blocks and plastic particles.

4. The process of claim 1, wherein the filter sieve is screened by using a filter sieve with a mesh size larger than that of the scrap aluminum.

5. The waste aluminum recovery pretreatment process as claimed in claim 1, wherein the cleaning solution is prepared from the following components in parts by weight: 8-10 parts of sodium dodecyl sulfate, 20-22 parts of ethanol, 0.2-0.4 part of modified camellia cake alcohol extract, 1.2-1.5 parts of sodium dihydrogen phosphate, 2-4 parts of ethylenediamine tetraacetic acid and 70-75 parts of deionized water.

6. The pretreatment process for recovering aluminum scrap according to claim 5, wherein the preparation method of the modified camellia oleifera cake alcohol extract comprises the following steps:

crushing the oil-tea camellia cake, sieving with a 120-mesh sieve to obtain powder, and mixing the obtained powder with an ethanol solution with the mass fraction of 75% according to the weight ratio of 120 g: 350ml, adding triethanolamine with the mass percent of 1.5% into the ethanol solution, stirring for 2 hours at 40 ℃ at the rotating speed of 120r/min, filtering to obtain primary filtrate and filter residue, and mixing the filter residue for the second time by adopting the ethanol solution with the mass fraction of 50%, wherein the mixing mass ratio is 100 g: 350ml, stirring for 3 hours at 40 ℃ at the rotating speed of 200r/min, then filtering to obtain secondary filtrate, combining the primary filtrate and the secondary filtrate, and then concentrating by rotary evaporation to obtain the modified oil-tea cake extract.

7. The pretreatment process for recovery of aluminum scraps according to claim 5, wherein the weight ratio of the modified oil-tea camellia cake extract to the ethylene diamine tetraacetic acid is 1: 10.

8. The process of claim 1, wherein the ultrasonic treatment is performed at an ultrasonic power of 800W and a frequency of 35 kHz.

9. The process of claim 1, wherein the pressing is performed under a pressure of 250MPa, and the aluminum cake has a diameter of 5cm and a thickness of 1 cm.

Technical Field

The invention belongs to the technical field of waste aluminum treatment, and particularly relates to a waste aluminum recovery pretreatment process.

Background

In recent years, the demand of the society for aluminum resources is increasing, and the number of waste aluminum alloys is also increasing. Aiming at the characteristics of the waste aluminum scraps: the surface of the aluminum scrap is oxidized too much, the impurity content in the aluminum scrap is too high, and the aluminum scrap often contains metals such as iron, copper, zinc and the like and paint carried on the surface of the aluminum scrap. The effective recovery and utilization of the waste aluminum alloy can reduce the energy crisis, develop the circular economy and improve the utilization rate of the recycled aluminum, which has become the development trend of all countries in the world. The development of circular economy is a necessary choice for continuous development, and the recycled aluminum industry can be regarded as a green industry as the key point of the development of the aluminum industry in China. When the existing method reclaims and treats the waste aluminum scraps, paint on the surface of the waste aluminum scraps is not easy to remove, and the subsequent processing of the waste aluminum scraps can be influenced.

Disclosure of Invention

The invention aims to provide a waste aluminum recovery pretreatment process aiming at the existing problems.

The invention is realized by the following technical scheme:

a pretreatment process for recovery of aluminum scrap comprises the following steps:

(1) adopting a permanent magnet to adsorb the waste aluminum scraps;

(2) screening the treated aluminum scraps by using a filter screen;

(3) adding the sieved aluminum scraps into a cleaning tank, adding cleaning liquid into the cleaning tank, heating to 70-80 ℃, stirring at the rotating speed of 350r/min for 40min, then carrying out ultrasonic treatment for 10-12min, and then filtering;

(4) and drying the filtered waste aluminum scraps to constant weight, and then pressing to obtain an aluminum cake.

As a further technical scheme, the permanent magnet is adopted to adsorb the waste aluminum scraps, the permanent magnet is used for removing scrap iron, iron wires and the like in the waste aluminum scraps, and meanwhile, large impurities in the waste aluminum scraps can be manually removed.

As a further technical solution, the large particle impurities include: sand, wood blocks, copper blocks and plastic particles.

As a further technical scheme, the filter sieve is used for screening by adopting the filter sieve with the mesh number larger than that of the waste aluminum scraps.

As a further technical scheme, the cleaning solution is prepared from the following components in parts by weight: 8-10 parts of sodium dodecyl sulfate, 20-22 parts of ethanol, 0.2-0.4 part of modified camellia cake alcohol extract, 1.2-1.5 parts of sodium dihydrogen phosphate, 2-4 parts of ethylenediamine tetraacetic acid and 70-75 parts of deionized water.

As a further technical scheme, the preparation method of the modified camellia oleifera cake alcohol extract comprises the following steps:

crushing the oil-tea camellia cake, sieving with a 120-mesh sieve to obtain powder, and mixing the obtained powder with an ethanol solution with the mass fraction of 75% according to the weight ratio of 120 g: 350ml, adding triethanolamine with the mass percent of 1.5% into the ethanol solution, stirring for 2 hours at 40 ℃ at the rotating speed of 120r/min, filtering to obtain primary filtrate and filter residue, and mixing the filter residue for the second time by adopting the ethanol solution with the mass fraction of 50%, wherein the mixing mass ratio is 100 g: 350ml, stirring for 3 hours at 40 ℃ at the rotating speed of 200r/min, then filtering to obtain secondary filtrate, combining the primary filtrate and the secondary filtrate, and then concentrating by rotary evaporation to obtain the modified oil-tea cake extract.

As a further technical scheme, the weight part ratio of the modified oil-tea camellia cake extract to the ethylenediamine tetraacetic acid is 1: 10.

As a further technical scheme, the ultrasonic power is 800W and the frequency is 35kHz in the ultrasonic treatment.

As a further technical scheme, the pressing is performed by adopting 250MPa pressure, the diameter of the aluminum cake is 5cm, and the thickness of the aluminum cake is 1 cm.

Has the advantages that: the invention carries out adsorption treatment on the waste aluminum scraps by adopting the permanent magnet, removes scrap iron, iron wires and the like in the waste aluminum scraps by adopting the permanent magnet, simultaneously can carry out manual removal on large impurities in the waste aluminum scraps so as to carry out rough impurity removal on the waste aluminum scraps, then screens the waste aluminum scraps by adopting the filter sieve so as to further remove small-particle impurities, dust and the like, and can further improve the purity of the waste aluminum scraps by adopting the cleaning solution prepared by the invention to clean the waste aluminum scraps so as to effectively remove stubborn stains in the waste aluminum scraps and have good cleaning effect on the stains by the synergistic action of the cleaning solution and ultrasonic treatment, and the cleaning solution prepared by the invention has good use effect, strong degreasing force, low production cost and no toxic or side effect, can destroy the adhesive force between paint and a waste aluminum scraps substrate, the surface tension on the interface of the stain and the waste aluminum scrap matrix is reduced, so that the waste aluminum scrap can be quickly and comprehensively cleaned under the synergistic action of the ultrasound.

Detailed Description