Self-catalytic reduction ammonia-leaching method for multi-metal concretion in deep sea

Abstract

The invention relates to a method to take self-catalytic reduction ammonia leaching from deep- sea multi-metal nodule, especially uses carbon monoxide as reducer. The process includes the following steps: adding grinded material to ammonia-ammiaonia sulfate solution and adding carbon monoxide to take reducing leach; concentrating and separating, filtering to gain leaching liquid A; washing filtered cake to gain the wash water B with nickel, copper, cobalt, molybdenum, and zinc; mixing the leaching liquid A and wash water B adding air to take oxidizing, filtering to gain deposit C and solution D that contains nickel, copper, cobalt, molybdenum and zinc; deposit C returning to leach, recycling nickel, copper, cobalt; recycling the valued metal in solution D. The invention could make the cuprous ion concentration stable from the copper leaching itself.

Description

technical field [0001] A method for deep-sea polymetallic nodule self-catalytic reduction ammonia leaching, relates to a method for selectively leaching valuable metals such as nickel, copper, cobalt, molybdenum from polymetallic nodules, especially in ammonia-ammonium sulfate solution, with carbon monoxide Catalytic reduction ammonia leaching method as reducing agent. Background technique [0002] Deep-sea polymetallic nodules are widely distributed in the seabed surface sediments of all oceans in the world, with a predicted reserve of 3×10 12 t, the Pacific Ocean alone has 1.7×10 12 t, and it is still growing, it is estimated that the annual new growth of polymetallic nodules in the world reaches 1×10 7 t. Metals of economic value in polymetallic nodules mainly include copper, nickel, cobalt, manganese, molybdenum, and zinc. With the continuous expansion of the global economy and the depletion of land resources, deep-sea polymetallic nodules will become an important str...

AI Technical Summary

Problems solved by technology

However, divalent copper ions enter the system, leading to an increase in carbon monoxide consumption, and the energy consumption of ammonia distillation is high, which also makes the process complicated

In order to ensure the smooth progress of the reduction leaching reaction, it is also required to adopt a higher leaching liquid-solid ratio, and the liquid-solid weight ratio is usually around 40, resulting in a large leaching equipment

[0006] The low cobalt leaching rate is a common shortcoming of the ammonia leaching process. The cobalt leaching rate of land laterite ore and polymetallic nodule reduction roasting-ammonia leaching usually does not exceed 60%, while the cobalt leaching rate of polymetallic nodule cuprous ion ammonia leaching is also very low. Difficult to exceed 70%

And the cobalt ion concentration of the solution has a very significant influence on the leaching of cobalt. The increase of the cobalt concentration will make the cobalt leaching rate drop sharply. When the cobalt concentration of the solution reaches 1g / l, the cobalt in the nodule is difficult to leaching

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