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1. CN109467065 - Equipment for regenerating acid from mixed acid waste liquor for stainless steel

Office China
Application Number 201811456886.5
Application Date 30.11.2018
Publication Number 109467065
Publication Date 15.03.2019
Publication Kind A
IPC
C01B 21/38
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
21Nitrogen; Compounds thereof
20Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
38Nitric acid
CPC
C01B 21/38
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
21Nitrogen; Compounds thereof
20Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
38Nitric acid
Applicants WISDRI ENGINEERING & RESEARCH INCORPORATION LIMITED COMPANY
中冶南方工程技术有限公司
Inventors ZHAO JINBIAO
赵金标
WANG JUN
王军
DING YU
丁煜
GAO JUNFENG
高俊峰
WU ZONGYING
吴宗应
Agents 北京汇泽知识产权代理有限公司 11228
北京汇泽知识产权代理有限公司 11228
Title
(EN) Equipment for regenerating acid from mixed acid waste liquor for stainless steel
(ZH) 一种不锈钢混酸废液再生酸设备
Abstract
(EN)
The invention belongs to the technical field of regeneration of mixed acid waste liquor, and particularly relates to equipment for regenerating acid from mixed acid waste liquor for stainless steel. The equipment comprises a reaction furnace, an absorption tower and a pre-concentration and replacement device for carrying out hydrofluoric acid and nitrate replacement reaction and pre-concentrationtreatment on the mixed acid waste liquor; a mixed acid waste liquor inlet of the pre-concentration and replacement device is communicated with a mixed acid waste liquor inlet tube; a concentrated liquor outlet of the pre-concentration and replacement device is communicated with a concentrated liquor inlet of the reaction furnace; a flue gas outlet of the reaction furnace is communicated with a flue gas inlet of the pre-concentration and replacement device; a flue gas outlet of the pre-concentration and replacement device is communicated with a flue gas inlet of the absorption tower; the top ofthe absorption tower is communicated with a spraying water tube; and the bottom of the absorption tower is communicated with a regenerated acid outlet tube. By the provided equipment for regeneratingthe acid from the mixed acid waste liquor for the stainless steel, pre-concentration treatment and nitric acid replacement reaction can be carried out in the pre-concentration and replacement device,lots of HNO3 is released from the pre-concentration and replacement device, the nitric acid recycling rate is increased, generated NOx is reduced, and the running cost is reduced.

(ZH)
本发明属于混酸废液再生技术领域,具体涉及一种不锈钢混酸废液再生酸设备,包括反应炉、吸收塔以及用于对混酸废液进行氢氟酸和硝酸盐置换反应以及预浓缩处理的预浓缩置换装置;预浓缩置换装置的混酸废液进口与混酸废液进管连通,预浓缩置换装置的浓缩液出口与反应炉的浓缩液进口连通,反应炉的烟气出口与所述预浓缩置换装置的烟气入口连通,预浓缩置换装置的烟气出口与吸收塔的烟气入口连通;吸收塔的顶部与喷淋水管连通,吸收塔的底部与再生酸出管连通。本发明的提供的不锈钢混酸废液再生酸设备在预浓缩置换装置中进行预浓缩处理以及硝酸置换反应,在预浓缩置换装置中释放出更多的HNO3,提高了硝酸的回收率,减少了NOx的产生,降低了运行费用。

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