Ore pressure leaching process

Abstract

The invention discloses an ore pressure leaching process. The process comprises the following steps: a grading preheating step: heating ore slurry made from ore to a preset preheating temperature with stream at grades; a leaching step: conveying the ore slurry which is heated at grades to the preheating temperature into a high-pressure kettle for carrying out acid leaching under preset leaching pressure at a preset leaching temperature so as to obtain leaching slurry liquid; a cooling and depressurizing step: cooling and depressurizing the leaching slurry liquid through flash evaporation; and a neutralizing, separating and purifying step: neutralizing and separating the cooled and depressurized leaching slurry liquid to obtain leaching slag and leaching liquid and purifying the leaching liquid. The ore depressing and leaching process of the invention has the advantages of little energy consumption, high heating speed and heat utilization efficiency and low cost.

Description

technical field [0001] The invention relates to a hydrometallurgy process, in particular to an ore pressurized acid leaching process. Background technique [0002] Due to its advantages in environmental protection, hydrometallurgy is more and more widely used in the field of metallurgy to replace pyrometallurgy. The wet smelting process mainly includes atmospheric pressure leaching and pressure leaching. The process of the pressure leaching process is generally to first make the ore into pulp, then preheat the pulp, and then carry out pressure acid leaching of the preheated pulp in an autoclave. , and then reduce the temperature and pressure, neutralize, separate the leach slurry and purify the leachate. [0003] In the traditional pressure leaching process, the pulp is heated to the required preheating temperature in one step. For example, Chinese patent application CN1400321A discloses a zinc sulfide concentrate pressure leaching method, in which the zinc sulfide concent...

AI Technical Summary

Problems solved by technology

If the traditional pressure leaching process is used to heat the laterite nickel ore to a preheating temperature above 200 degrees Celsius in one step, a large amount of heating steam will be consumed, the heat utilization efficiency is low, and the heating time is long and the cost is high

[0005] In addition, for the case of high leaching temperature, the cooling and pressure reduction of the traditional pressurized leaching process is also completed in one step, so the cooling time and pressure reduction time is long, the efficiency is low, and the heat generated by the cooling and pressure reduction has not been recycled, resulting in energy waste

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