Method for preparing urea ammonium nitrate solution from waste nitric acid after stripping tin from circuit board

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United States of America Patent

PATENT NO 11807542
APP PUB NO 20210163305A1
SERIAL NO

17048050

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Abstract

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A method for preparing urea ammonium nitrate solution from waste nitric acid after stripping tin from circuit board includes: causing the waste nitric acid after stripping tin and the ammonia water to undergo neutralizing and precipitating reaction through acid-base neutralization, filtering, thereby obtaining tin-containing filter mud and a primary filtrate; adding iron powders into to the primary filtrate to initiate copper-iron replacement reaction, filtering, thereby obtaining iron-containing coarse copper powders and a secondary filtrate; adding hydrogen peroxide to the secondary filtrate, filtering, thereby obtaining an iron-containing sludge and a tertiary filtrate; adding a heavy metal capturing agent to the tertiary filtrate, filtering, thereby obtaining a heavy metal sludge and an ammonium nitrate solution; measuring a concentration of the ammonium nitrate solution, adding urea and liquid fertilizer corrosion inhibitor to obtain a urea/ammonium nitrate dilute solution, evaporating and concentrating the urea/ammonium nitrate dilute solution, thereby obtaining the urea ammonium nitrate solution.

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Patent Owner(s)

Patent OwnerAddress
SHENZHEN ENVIRONMENTAL TECHNOLOGY GROUP CO LTDBLDG A NO 18 INDUSTRIAL AVE 3RD INDUSTRIAL ZONE BITOU COMMUNITY SONGGANG SUBDISTRICT BAOAN DIST SHENZHEN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Chang-Ming Shenzhen, CN 8 55
Huang, Kuan-Wei Shenzhen, CN 35 150
Huang, Xue-Qiang Shenzhen, CN 1 0
Liao, Chun-Hua Shenzhen, CN 1 0
Mao, Chao-Lin Shenzhen, CN 1 0
Wang, Wei-Hong Shenzhen, CN 11 76
Wu, Jian-Gang Shenzhen, CN 1 0

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