System and technique for recovering calcium salts from heavy oil field exploitation waste liquid

The invention relates to a system and technique for recovering calcium salts from a heavy oil field exploitation waste liquid. The major equipment comprises a filter, a mixing reactor, a concentrator, a crystallizer, a solid-liquid separator, a dryer and a plurality of pumps. The technique mainly comprises the following steps: chemical settling, filtering, crystallizing and drying. The technique can recover high-value mineral salts from the waste liquid generated in the oil sand treatment process. The technique solves the problem of treatment of the waste liquid after extraction, can obtain high-added-value chemical products, increases the economic benefit, and reduces the environmental pollution.