The lime digestion (of gray machine, elimination of lime and machines, lime digester) is the treatment of calcium carbonate, dicalcium phosphate of lime digestion equipment, mainly used in chemical, metallurgy, wastewater treatment, chemical fiber, paper, power plant desulfurization system sugar, soda ash manufacturing and other industries. Lime digestion machine from the power plant, filters, rolling ring, cylinder (outer tube and inner tube), the ring gear, supporting roller devices, components, cylinder internal set four districts, namely, buffer, digestion area, homogeneous areas, milk residue sharing, the tail has a slag and slag discharge device. The lime digestion machine is characterized by the rotary motion instead of mixing the lime. Lime digest the rear of the machine cylinder with a sieve, caustic lime with water in the barrel after the exposure to water absorption and digest, milk of lime through the sieve outflow from the outlet, unable to digest the burn and the Health and burnt lime by the outer cylinder the tail of the the Slag device outside the discharge tube. The gray machine structure unit is reasonable, convenient operation, high production efficiency, production capacity, labor intensity, apply lime any quality.