Comprehensive recycling method of waste sand in green casting
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A wet-type and film-removing technology, which is applied to casting molding equipment, cleaning/processing machinery of casting mold materials, manufacturing tools, etc., can solve the problems of high cost, cumbersome and complicated regeneration process, and few applications, and achieve good results Effect
Active Publication Date: 2013-06-05
SHANDONG YUANTONG MASCH CO LTD
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Problems solved by technology
In my country, the development of used sand regeneration technology is relatively backward, and t
Method used
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Embodiment 1
[0021] The waste sand is the old sand eliminated from the casting production of the single cylinder diesel engine body. Crushing, 2-stage magnetic separation, screening, dehydration and drying, 1-stage mechanical friction stripping, 1-stage wind separation dust removal, 2-stage mechanical friction stripping, 2-stage wind separation dust removal, 3-stage mechanical friction stripping, 3-stage boiling Dust removal and screening, finally get qualified recycled sand.
[0022] Level 1 magnetic separation uses a permanent magnet belt magnetic separator.
[0023] The second-stage magnetic separation adopts a suspended magnetic separator.
[0024] Dehydration and drying use a three-pass tumble dryer.
[0026] Class 1 and Class 2 air separation dust removal adopts flow mode sorting and pulse bag filter.
[0027] The three-level mechanical friction stripping adopts eddy current rubb...
Embodiment 2
[0031] The product is the end cover of motor parts, the weight of a single piece is 30kg, the material is gray cast iron (HT250), clay sand wet molding process, and machine modeling. The proportion of molding sand is to add 30% of new sand and eliminate 30% of waste sand. After the waste sand is passed through the steps in Example 1, the regenerated sand is obtained, and all the regenerated sand is reused. Only 3% of the new sand is added, and the molding cost is reduced by about 15%. Units meet the process requirements.
Embodiment 3
[0033] The product is a box, the weight of a single piece is 85kg, the material is HT250 clay sand wet molding process, machine molding, and the sand core is also clay sand. It turns out that the core sand of the casting is completely eliminated after sand falling out. Now, after regeneration using the steps in Example 1, it is still used as the sand for the sand core, and the addition amount is 100%. The produced sand core fully meets the process requirements. There are no defects such as core choking and sand inclusions, and there are no internal defects after processing.
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Abstract
The invention relates to a comprehensive recycling method of waste sand in green casting, and belongs to the field of novel casting processes. The comprehensive recycling method of the waste sand in green casting is characterized in that the waste sand in green casting is recycled through the following steps: a first level of magnetic separation and smashing, a second level of magnetic separation, screening, dewatering and drying, a first level of mechanical friction demoulding, a first level of winnowing and dedusting, a second level of winnowing and dedusting, a third level of mechanical friction demoulding, a third level of boiling, dedusting and screening; and finally qualified recycled sand is obtained. A permanent magnet belt magnetic separation machine is used in the first magnetic separation of the waste sand, a three-return-stroke roller dryer is adopted during dewatering and drying, a suspension-type magnetic separation machine is adopted in the second level magnetic separation, centrifugal mechanical friction demoulding is adopted in the first level of mechanical friction demoulding and the second level of mechanical friction demoulding, streaming mode winnowing and a pulse-bag-type dedusting machine are adopted in the first level of winnowing and dedusting and the second level of winnowing and dedusting, vortex kneading demoulding is adopted in the three level of mechanical friction demoulding, and a fluidized bed and the pulse-bag-type dedusting machine are adopted in the third level of boiling and dedusting.
Description
technical field [0001] The invention relates to a regeneration and comprehensive utilization method of waste sand in green casting, which belongs to the field of new foundry technology. Background technique [0002] The foundry industry is an indispensable industry in the machinery manufacturing industry. Among them, the proportion of sand casting accounts for 80%-90%. At present, the annual output of castings in my country is more than 10 million tons, and the amount of recycled sand is as high as 100 million tons. The recovery rate of old sand can generally reach 80%-90%, and 10%-20% of recycled old sand must be discarded continuously. Based on the calculation of 10% waste, 10 million tons of old sand is discarded in a year in the whole country, that is, 1 ton of new sand needs to be added to produce 1 ton of castings, and 1 ton of old sand must be discarded. In casting, most of the sand used is high-quality quartz sand. However, there is a relative shortage of high-qua...
Claims
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Application Information
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