Abstract: 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

Abstract: 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

Abstract: A method for booting to an operating system stored on a solid state drive. The method comprises the steps of (A) determining if a boot list has one or more entries, (B) pre-reading one or more logical block addresses of each of the entries from the boot list, (C) receiving a command from a host, (D) reading the command from a memory internal to the solid state drive if the command is in a cache area of the pre-read logical block addresses and (E) reading the command from a main portion of the solid state drive if the command is not in the cache.

Abstract: A method for booting to an operating system stored on a solid state drive. The method comprises the steps of (A) determining if a boot list has one or more entries, (B) pre-reading one or more logical block addresses of each of the entries from the boot list, (C) receiving a command from a host, (D) reading the command from a memory internal to the solid state drive if the command is in a cache area of the pre-read logical block addresses and (E) reading the command from a main portion of the solid state drive if the command is not in the cache.