Combined cotton pulp purification device

The utility model belongs to the technical field of propellant manufacturing, and discloses a combined cotton pulp purification device which comprises a high-concentration slag separator, a cotton pulp storage tank, a permanent magnet iron remover, a metal detection system and a cotton pulp pump, the high-concentration slag separator is provided with a slag discharge port, the slag discharge port is connected with an inlet of the cotton pulp storage tank, and an outlet of the cotton pulp storage tank is communicated with an inlet of the cotton pulp pump; an outlet of the cotton pulp pump is communicated with a cotton pulp inlet in the permanent magnet iron remover, and the permanent magnet iron remover is further provided with a cotton pulp outlet which is communicated with a cotton pulp pipeline inlet of the metal detection system. According to the technical scheme, most of metal impurities and non-metal impurities in cotton pulp can be removed, cotton pulp purification is achieved from the raw material link