Indonesia's local laterite-nickel ore wet-process smelting method

Abstract

The invention relates to the field of smelting, and discloses an Indonesia's local laterite-nickel ore wet-process smelting method. The method comprises the following steps: 1) adding water into laterite-nickel ore and grinding the laterite-nickel ore into ore pulp; 2) adding hydrochloric acid and sodium chloride for leaching; 3) carrying out solid-liquid separation; 4) extracting and separating Ni < 2 + >, Fe < 2 + > and Cr < 3 + > in the liquid by using an extraction agent; 5) introducing ozone into the upper-layer extraction agent, carrying out solid-liquid separation, taking the precipitate as a main product, and circularly using the extraction agent; and 6) introducing the ozone into a lower-layer water solution, carrying out solid-liquid separation, and taking the precipitate as an auxiliary product after solid-liquid separation; and circularly using Na < + >, H < + > and Cl <-> in the lower-layer water solution. The method disclosed by the invention is innovated on the basis ofa traditional wet-process smelting process, and the local conditions are sufficiently taken into consideration, Indonesia's local specific natural resources are utilized, and most of the chemical agents are recycled, so that the production cost is greatly reduced, the whole process system tends to zero emission, the content of nickel in the product is high, and the recovery rate is high.

Description

technical field [0001] The invention relates to the field of smelting, in particular to a local Indonesian laterite nickel ore hydrometallurgy method. Background technique [0002] With the development of the global economy, the progress of society and the improvement of people's living standards, the demand for stainless steel is increasing. The output of stainless steel in China alone has reached 30 million tons, and the market value has reached 600 billion yuan. The main component of stainless steel is nickel, followed by chromium and iron, and laterite nickel ore contains valuable metal elements such as nickel, iron and chromium, which are all necessary elements for stainless steel. The pricing of products currently in circulation in the market is mainly based on the effective metal nickel, while chromium and iron are not. In this way, stainless steel plants use the ferronickel from laterite nickel ore as raw materials, which greatly reduces production costs. Compared wi...

AI Technical Summary

Problems solved by technology

The smelting methods from laterite nickel ore to nickel-iron or other commodity-grade nickel-iron compounds are roughly divided into pyrometallurgy and hydrometallurgy. The pyrometallurgical process uses the principle of different melting points of mineral elements to calcinate the minerals at high temperature to improve the grade of nickel. , but has the defect of high energy consumption and high emission

For hydrometallurgy, most of the current wet processes have disadvantages such as large investment scale, high risk factor, high process threshold and low recovery rate.