Energy-saving environment-friendly pickling equipment

Abstract

The invention relates to the technical field of pickling equipment, in particular to energy-saving environment-friendly pickling equipment. Through the energy-saving environment-friendly pickling equipment, waste hydrochloric acid liquid is recovered effectively, meanwhile the yield of waste hydrochloric acid is lowered, and production cost is lowered. The energy-saving environment-friendly pickling equipment comprises a pickling trough, a filtrate trough, a feeding pump, a circulating pump, a heating chamber, a separation chamber, a crystallization chamber, a centrifuge and steam generating equipment. The steam generating equipment is used for pumping steam into the heating chamber. The feeding pump is used for pumping acid liquid in the pickling trough 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 trough. The output end of the separationchamber is further connected with the input end of the crystallization chamber through the circulating pump. The output end of the crystallization chamber is connected with the centrifuge. The outputend of the centrifuge is provided with the filtrate trough.

Description

technical field [0001] The invention relates to the technical field of pickling equipment, in particular to an energy-saving and environment-friendly pickling equipment. Background technique [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, t...

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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 it can only process synthetic hydrochloric acid; 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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