The invention discloses a washing method of high-
calcium phosphorous-removed
silicon. According to the invention, high-
calcium metal silicon is crushed into particles; the particles are subject to
grinding and sieving, such that
powder is obtained; the
powder is sampled, and the
calcium content is determined; the
powder is soaked by using a
hydrochloric acid solution; the mixture is stirred, and is subject to
solid-liquid separation; the mixture is washed by using deionized water, such that primary mixed powder is obtained; the primary mixed powder is soaked by using an alkali solution; the mixture is stirred, and is subject to
solid-liquid separation; the mixture is washed by using deionized water, such that secondary mixed powder is obtained; the secondary mixed powder is soaked by using a mixed acid solution of
sulfuric acid and
hydrofluoric acid; the mixture is stirred, and is subject to
solid-liquid separation; the mixture is washed by using deionized water, such that
tertiary mixed powder is obtained; the
tertiary mixed powder is soaked by using a mixed acid solution of
hydrochloric acid and
hydrofluoric acid; the mixture is stirred, and is subject to solid-liquid separation; the mixture is washed by using deionized water, such that
quaternary mixed powder is obtained; the
quaternary mixed powder is subject to
vacuum drying, such that low-phosphorous
silicon powder is obtained. With the washing method provided by the invention, on a basis that impurities such as calcium and phosphorous are effectively removed, the generations of flammable and combustible gases are reduced, such that production can be safely preceded.