Method for rapidly and directly dipping nickel sulfide concentrate under action of ultrasonic wave

Abstract

The invention discloses a method for rapidly and directly dipping nickel sulfide concentrate under the action of ultrasonic wave, belonging to the field of heavy non-ferrous metal hydrometallurgy. The method comprises the following steps of: crushing nickel ore (or directly using commercially-sold ore fines) and ensuring that the granularity of over 90 percent of ore is 0.15-0.08 mm; evenly mixing the nickel ore and water and placing the mixture into a stainless steel reactor, wherein the weight ratio of the water to the nickel ore is 5-30:1; adding an oxidant which can be sodium nitrate or potassium nitrate, wherein the weight ratio of concentrated sulfuric acid to the nickel ore is 0.5-1.1:1; finally keeping the ultrasonic frequency at 20.02kHz and the power at 50-150W under the action of ultrasonic wave; and directly dipping at normal pressure and normal temperature for 40-60 min. The invention has the characteristics of operation at normal pressure, high reaction speed, high leaching rate up to 97-99 percent for only 40-60 min and relative safety and low cost by taking solid nitrate as the oxidant.

Description

technical field [0001] The invention belongs to the field of heavy non-ferrous metal hydrometallurgy, in particular to a new method for directly leaching nickel from nickel sulfide concentrate through oxidative acidolysis under the action of ultrasonic waves. Background technique [0002] Due to the nature of nickel sulfide concentrate itself and its associated minerals, it is not easy to extract metallic nickel from it: the recovery of low-concentration sulfur dioxide produced in the pyrometallurgical process is still a worldwide problem; Sulfur dioxide is produced, but usually the leaching speed is slow, the efficiency is low, it takes a long time and the cost is high. [0003] In order to solve the problems of inefficiency, time-consuming and high cost in wet nickel leaching process, various new processes of wet nickel leaching have been proposed. For the convenience of description, according to the basic parameters of its operation, it is divided into two types: normal ...

AI Technical Summary

Problems solved by technology

But the problem with the former is that gaseous oxidants are not easy to preserve, and some are expensive, and some are unsafe for operators; while the latter is that there is a limit to mechanical stirring: when the speed reaches a certain limit, no matter how you increase the stirring speed, have no effect on the thinning of the adsorbed layer

And high temperature operation can not completely eliminate the adsorption layer, and there is a problem of high energy consumption