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Method and system for recovering PTFE (Polytetrafluoroethylene) fibers and PPS (Polyphenylene Sulfide) in waste dust removing bag

A recycling method and dust bag technology, applied in the field of designing dust bag recycling, can solve the problems of high unit price, high price of dust bag, and difficult PTFE treatment.

Active Publication Date: 2014-04-02
山川秀美生态环境工程股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the unit price of PTFE material and PPS material is relatively high, resulting in the high price of the dust bag
In order to reduce production costs, it is imperative to recycle waste dust bags, but in the development of recycling technology, PTFE is difficult to handle. PTFE is commonly known as the king of plastics, and it does not change in boiling aqua regia
Therefore, due to the excellent chemical stability of PTFE, the existing technology cannot be recycled, so the waste dust bags can only be stored

Method used

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  • Method and system for recovering PTFE (Polytetrafluoroethylene) fibers and PPS (Polyphenylene Sulfide) in waste dust removing bag

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Embodiment Construction

[0022] The technical solution of the present invention will be described below in conjunction with the accompanying drawings. Apparently, the accompanying drawings describe only a part of the present invention rather than all embodiments.

[0023] Such as figure 1 Shown, a kind of method that the present invention provides reclaims PTFE fiber and PPS in waste dust bag, comprises the following steps:

[0024] 101: Hot melting, at a temperature of 250°C-260°C, hot melt the waste dust bag until the PPS is completely melted;

[0025] 102: Breaking, breaking the solid block after the hot melt is cooled to a mixture of powder, fiber, and block solid matter;

[0026] 103: Sieve, sieve the mixture, recover the PTFE fiber and PPS powder, and return the blocky solid to step 102.

[0027] Under normal conditions, the melting point of PPS is 281°C. In the present invention, 250°C-260°C is selected because the performance of PPS in the discarded dust bag after long-term use has decreased...

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Abstract

The invention discloses a method and system for recovering PTFE (Polytetrafluoroethylene) fibers and PPS (Polyphenylene Sulfide) in a waste dust removing bag. The method comprises the following steps of carrying out hot-melting, namely, at a temperature of 250-260 DEG C, carrying out hot-melting on the waste dust removing bag until the PPS is completely melted; crushing, namely, crushing a cooled blocky hot-melted object into a mixture of powder, fibers and blocky solid matters; and screening, namely, screening the mixture, recovering the PTFE fibers and the PPS powder, and crushing the blocky solid matters. The method has the beneficial effects that the hot melting is preformed according to the difference of melting points of two materials, and the separation is performed according to the difference of physical properties so that the PTFE fibers and the PPS in the waste dust removing bag are recycled.

Description

technical field [0001] The invention relates to the field of dust bag recycling, in particular to a method and system for recycling PTFE fibers and PPS in waste dust bags. Background technique [0002] PPS (polyphenylene sulfide) and PTFE (polytetrafluoroethylene) dust bags are favored by many industrial manufacturers because of their ability to filter micron-sized dust up to 99.99%, and they are widely used in steel, cement, metallurgy and Chemical and other industries. At the same time, the unit prices of PTFE materials and PPS materials are relatively high, which makes the dust bag expensive. In order to reduce production costs, it is imperative to recycle waste dust bags. However, in the development of recycling technology, PTFE is difficult to handle. PTFE is commonly known as the king of plastics, and it does not change in boiling aqua regia. Therefore, due to the excessively good chemical stability of PTFE, the prior art cannot recycle, so the waste dust bags can on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B17/02
CPCY02W30/52Y02W30/62
Inventor 王茂盛杜永林
Owner 山川秀美生态环境工程股份有限公司
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