Energy-saving environment-friendly pickling equipment

Abstract

The invention relates to the technical filed of pickling equipment, and in particular relates to energy-saving environment-friendly pickling equipment. The energy-saving environment-friendly pickling equipment provided by the invention has the advantages of effectively recycling waste hydrochloric acid liquid, reducing the output of waste acid liquid and reducing the production cost at the same time. The equipment comprises a pickling tank, a filtrate tank, a feed pump, a circulating pump, a heating chamber, a separation chamber, a crystallization chamber, a centrifugal machine and steam generating equipment, wherein the steam generating equipment is used for pumping steam into the heating chamber; the feed pump is used for pumping acid liquor in the pickling tank into the heating chamber; the output end of the heating chamber is connected with the input end of the separation chamber; the output end of the separation chamber is connected with the pickling tank; the output end of the separation chamber is further collected with the input end of the crystallization chamber through the circulating pump; the output end of the crystallization chamber is connected with the centrifugal machine; the output end of the centrifugal machine is provided with the filtrate tank.

Description

Technical field [0001] The invention relates to the technical field of pickling equipment, in particular to an energy-saving and environmentally friendly pickling equipment. Background technique [0002] As we all know, pickling equipment is widely used in steel rolling, drawing, phosphating, electroplating and other metal processing industries to remove rust and scale. Among them, the effect and speed of the pickling process depend on the concentration of acid, temperature and iron. The concentration of ions (iron salt), and at the same time, to prevent hydrogen embrittlement, hydrochloric acid is generally used to react with the metal oxide on the surface of the workpiece, and the pickling process generates water-soluble ferric chloride salt; in the prior art, the The heating method is usually to pass steam directly into the pickling tank to keep the temperature of the pickling liquid at 70°C. However, during use, the steam condenses into water to dilute the pickling liquid, an...

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Problems solved by technology

[0002] As we all know, pickling equipment is widely used in metal processing industries such as steel rolling, drawing, phosphating, electroplating, etc. At the same time, in order to prevent hydrogen embrittlement from occurring, hydrochloric acid is generally used to react with metal oxides on the workpiece surface, and the pickling process generates water-soluble ferric chloride; in the prior art, the pickling equipment The heating method is usually to pass steam directly into the pickling tank to keep the temperature of the pickling solution at 70°C. However, during use, the steam is continuously condensed into water to dilute the pickling solution, and the iron ion content in the pickling solution continues to increase. When the concentration of the two reaches a certain level, the quality and speed of pickling will decrease. At this time, it is necessary to replace the new pickling solution to maintain production. This method further leads to an increase in the output of waste acid, and acid treatment cost increase

[0003] In the prior art, the recovery of waste hydrochloric acid mainly adopts two methods: one is a spray roasting method, and the other is a distillation method, wherein the spray roasting method is to separate hydrogen chloride, water and iron oxide by roasting, and dissolve hydrogen chloride in water to obtain Regenerated hydrochloric acid, this treatment method can receive hydrochloric acid with higher concentration, and iron oxide can also be sold in the market, but the investment is large, the operating cost is high, and only synthetic hydrochloric acid can be processed; the distillation method is to convert hydrogen chloride and water into Steam, after condensation, is regenerated acid. At the same time, the ferrous chloride is recovered through the crystallization device. The cost of this treatment method is slightly lower, and the by-product hydrochloric acid used by most enterprises can be recovered. However, because the concentration of hydrochloric acid used and the boiling point of water are roughly the same, The concentration of regenerated acid is the same as that before treatment, and it can only be used in proportion with new acid

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