A method and device for regenerating stainless steel mixed acid pickling waste acid by spray roasting method
A spray roasting method and stainless steel technology, which is applied in the field of stainless steel mixed acid pickling waste acid regeneration by spray roasting method, can solve the problems of environmental pollution, large amount of sludge, free acid and metal oxides cannot be recycled, and reduce production costs Effect
Active Publication Date: 2018-01-12
鞍山创鑫环保科技股份有限公司
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Problems solved by technology
[0002] Stainless steel must undergo pickling process before cold rolling. The pickling solution is usually prepared by mixing nitric acid and hydrofluoric acid. The waste acid produced after pickling is generally treated by neutralization method in small and medium-sized enterprises, although some parameters can be adjusted to discharge standards. , but the free acid and metal oxides in the waste acid cannot be recovered, which is a waste of resources. The use of quicklime to neutralize the sludge will cause a large amount of sludge, and some harmful elements will also be discharged, causing serious pollution to the environment. In small and medium-sized enterprises, The law of neutralization is still in use today
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[0023] The present invention will be described in detail below in conjunction with the accompanying drawings, but it should be pointed out that the implementation of the present invention is not limited to the following embodiments.
[0024] See Figure 1-Figure 3 The method for regenerating stainless steel mixed acid pickling waste acid by spray roasting method uses roasting furnace 1 to oxidize waste acid at high temperature to make it react into solid metal iron powder and acid gas, and then spray and absorb to generate regenerated mixed acid, which specifically includes the following steps:
[0025] 1) The waste mixed acid at 55°C to 65°C from the pickling line is sent to the waste acid tank 3 for storage, and the waste acid pump 4 sends the waste acid through the filter 5 to the lower part of the Venturi scrubber 2, and then the Venturi circulation pump 6 Circulate and spray on the upper part of the Venturi scrubber 2, and the spray pressure of the Venturi circulating pum...
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Abstract
The invention relates to a pickling waste acid method and device for regenerating stainless steel mixed acid by spray roasting method. A roasting furnace is used to oxidize the waste acid at high temperature to react it into solid metal iron powder and acid gas, and then spray and absorb to generate regenerated mixed acid, including a roasting furnace , raking machine, pelletizing machine, Venturi scrubber, absorption tower, scrubber, 2 spray guns are arranged on the top of the roasting furnace, and the spray guns are lifted and lowered by a pneumatic device; a raking machine is connected to the bottom of the roasting furnace, and the raking machine is connected to the The pelletizing machine is connected; the roaster is connected with the Venturi scrubber, the Venturi scrubber is connected with the absorption tower, and the absorption tower is connected with the scrubber; the scrubber is connected with the denitrification system through the exhaust fan and the horizontal droplet separator. The advantages are: the waste acid is roasted and decomposed at high temperature to generate iron oxide powder and regenerated acid, the stainless steel metal ions and free acid combined with acid during pickling are recovered, and the regenerated acid is returned to the pickling line for recycling, reducing acid consumption.
Description
technical field [0001] The invention belongs to the field of stainless steel mixed acid pickling waste acid regeneration in the metallurgical industry, and in particular designs a method and device for regenerating stainless steel mixed acid pickling waste acid by using a spray roasting method. Background technique [0002] Stainless steel must undergo pickling process before cold rolling. The pickling solution is usually prepared by mixing nitric acid and hydrofluoric acid. The waste acid produced after pickling is generally treated by neutralization method in small and medium-sized enterprises, although some parameters can be adjusted to discharge standards. , but the free acid and metal oxides in the waste acid cannot be recovered, which is a waste of resources. The use of quicklime to neutralize the sludge will cause a large amount of sludge, and some harmful elements will also be discharged, causing serious pollution to the environment. In small and medium-sized enterpri...
Claims
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IPC IPC(8): C23G1/36
Inventor 孟祥全孟剑张嘉鹏洪成峰樊江波刘伟
Owner 鞍山创鑫环保科技股份有限公司