Stainless steel pickling system and method adopting pickling solution without nitric acid
A technology for pickling liquid and stainless steel, applied in the field of stainless steel pickling system, can solve the problems of difficult and efficient separation of impurities, low degree of automation, acid containing nitric acid, etc., to improve the production environment, improve the degree of automation, and save operating costs.
Inactive Publication Date: 2014-06-25
ZHEJIANG UNIV
View PDF3 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The purpose of the present invention is to overcome the deficiencies of the existing pickling process, such as acid liquid containing nitric acid, difficult to efficiently separate impurities, and low degree of automation, and provide a stainless steel pickling system and method thereof in which the pickling liquid does not contain nitric acid
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0020] The stainless steel pickling process in which the pickling solution does not contain nitric acid is to add tap water to the pickling tank in advance, open the valves of the acid delivery pipe, ferric sulfate delivery pipe and steam delivery pipe, and the acid solution in the acid delivery pipe is H 2 SO 4 , HF and H 2 o 2 , according to the liquid level of the pickling tank, the dosage of the acid solution is controlled, and the acid solution circulation pump and the dissolved air pump are turned on at the same time, and the acid solution, steam and H 2 o 2 Rapidly mix and heat up in the pipeline, meanwhile, the gas dissolved by the dissolved air pump is released in the pickling tank through the microporous aeration head to generate a large number of microbubbles, providing the oxygen required for the pickling reaction process, and passing through the overflow swash plate The horizontal thrust makes the microbubbles in the pickling solution fill the entire pickling t...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a stainless steel pickling system and method adopting a pickling solution without nitric acid. The system comprises an acid solution delivery pipe, a ferric sulfate delivery pipe, a steam delivery pipe, an acid solution circulating delivery pipe, an acid solution circulating pump, a refrigerator, a filter device and a dissolved gas pump. A system body comprises a pickling bath, microporous aeration heads, an overflow inclined plate, a filter screen, a first mixing zone, a second mixing zone, an oxidation-reduction electrode, an F ion electrode, an acidometer and an aerometer. The stainless steel pickling system has the beneficial effects that the system can obviously improve the degree of automation of the pickling process, reduce the labor intensity and improve the pickling efficiency, and can reduce the cleaning period, save the usage amount of medicaments and greatly save the operating cost; as the pickling solution does not contain nitric acid, a series of environmental problems that workshops exhaust yellow smoke, wastewater contains nitrogen and the like are thoroughly solved; the pickling solution is quickly mixed and heated in a closed circulating system, and the stainless steel pickling system simultaneously has the acid solution supply and cleaning functions; the stainless steel pickling system is efficient, clean and energy-saving.
Description
Technical field [0001] The present invention involves a method of stainless steel pickling system without nitrate. Background technique [0002] When stainless steel is rolled from the billet to various plates and profiles, the surface will be O. 2 Oxidation produces a tight oxidation layer of black and yellow. In order to improve the appearance and corrosion resistance of stainless steel, the stainless steel after processing must be carried out.Usually mixed acid (HNO (HNO 3 +HF) The pickled iron oxide skin is removed.In order to increase the picking speed, the acid concentration of the acid liquid is usually higher, and it will warm it at the same time.Metal and metal oxides and high -temperature strong acidic acid washing liquid occurred in a severe chemical reaction, which produced a large number of H 2 And NO x For an acid gas, the gas is carried during the rise of the ups and downs, which produces a large amount of acidic gas -soluble gel pollutants, that is, the acid mist....
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): C23G3/00C23G1/08
Inventor 雷乐成杨彬夏峥
Owner ZHEJIANG UNIV