General projects: lime and gypsum manufacturing; Lime and gypsum sales; Sales of non-metallic minerals and products; Manufacture of coal-fired flue gas desulfurization and denitrification equipment; Sales of coal-fired flue gas desulfurization and denitrification equipment; Manufacture of special chemical products (without hazardous chemicals); Sales of food additives (except for items subject to approval according to law, independently carry out business activities according to law with business licenses)