MONTREAL, May 30, 2024 (GLOBE NEWSWIRE) -- HPQ Silicon Inc. (“HPQ” or the “Company”) (TSX-V: HPQ) (OTCQB: HPQFF) (FRA: O08), a technology company specializing in green engineering of silica and silicon-based materials, announces receipt of a notice from PyroGenesis Canada Inc. (TSX: PYR) (OTCQX: PYRGF) (FRA: 8PY) (“PyroGenesis”) with intent to immediately exercise the right to convert its 10% gross sales royalty into a 50% ownership of HPQ Silica Polvere Inc. (“HPQ Polvere”), a wholly-owned subsidiary of HP ...