Medium-temperature phosphorizing-film liquid medicine circulating filter pressing system and method

Abstract

The invention relates to a medium-temperature phosphorizing-film liquid medicine circulating filter pressing system and a method. The medium-temperature phosphorizing-film liquid medicine circulatingfilter pressing system comprises a phosphorizing film tank, a transfer tank and a filter press; a heating device is arranged in the phosphorizing film tank, and liquid medicine and a workpiece are contained in the phosphorizing film tank, so that the workpiece is soaked in the liquid medicine. The medium-temperature phosphorizing-film liquid medicine circulating filter pressing method comprises the following steps: 1, putting the workpiece into the phosphorizing film tank, and putting the liquid medicine into the phosphorizing film tank; and 2, pumping the liquid medicine in the phosphorizingfilm tank to a position above a filter disc of the filter press through a first connecting pipe through a first liquid pump water outlet. According to the medium-temperature phosphorizing-film liquidmedicine circulating filter pressing system and the method, artificial pumping of the liquid medicine into a precipitation tank for precipitation is not needed, the timeliness and the utilization rate of the phosphorizing film liquid medicine are greatly improved, and therefore the use amount of the phosphorizing film liquid medicine put into the precipitation tank on a large scale every day in the past is reduced, and manual tank pouring, temperature rising and the like are avoided.

Description

technical field [0001] The invention relates to the field of skin membrane medicinal liquid, in particular to a medium-temperature skin membrane medicinal liquid circulating filter press system and method. Background technique [0002] The film is a phosphating film, a metal pretreatment process, in preparation for the subsequent process. Phosphate reacts with metal to form a layer of precipitate that adheres tightly to the surface of the metal, which is phosphate film treatment. The crystals are required to be small and dense. [0003] Phosphate film formation is a corrosion reaction, which keeps the corrosion components on the metal surface, and uses the corrosion products to form a film in a clever way. [0004] Phosphate coating drugs are made of phosphoric acid (H 3 PO 4 ) and the first phosphate [Me(H 2 PO 4 ) 2 ...Me is composed of divalent metals such as Mn and Zn], and its formation mechanism is as follows: [0005] ⑴Fe(processed substance)+2H 3 PO 4 →Fe(H...

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Problems solved by technology

[0010] The existing medium-temperature phosphating solution film is formed by immersing the workpiece (steel and iron pieces) in the phosphating solution (some acid phosphate, zinc-based solution), and depositing a layer of water-insoluble crystalline phosphate on the surface. The process of film is called phosphating, this kind of phosphating is medium temperature phosphating, the temperature reaches 60--68°, the treatment time is 10-20 minutes, and the thickness of phosphating film is 10-30g / m 2 , the free acidity and total acidity of the solution are 8-11pt / 58-68pt. This kind of phosphating film has strong corrosion resistance and good binding force. Many phosphating deposits, unstable free acid

[0011] After 12 hours of film medicine production, a large amount of film slag needs to be poured for sedimentation. Every day, one person will work overtime for 1 hour to pour the medicine solution; each time the tank is poured and sedimented, the medicine is lost by 1 / 3, and about 12 barrels (360kg) of fresh water need to be added every day. liquid medicine, resulting in waste of cost

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