Method for comprehensive exploitation of low-ore grade laterite nickel mine

Abstract

The invention discloses a method for comprehensively developing low-grade nickeliferous laterite ore. The main technique comprises the steps of the preparation of minerals, chlorination and leaching, the oxidation of leachate, the regeneration of hydrochloric acid and the hydrolysis of settled iron, solid-liquid separation, sulfuration and sediment and the recycling of chloride and the like; the method is characterized in that the nickeliferous laterite ore is leached out by hydrochloric acid and the chloride at normal pressure and iron in the nickeliferous laterite ore is leached out as much as possible; leached ferrous ions are oxidized into ferric ion; the regeneration of hydrochloric acid and hydrolysis of settled iron are realized synchronously under the condition of normal pressure and the temperature of 140 to 180 DEG C; the collection of the regenerated hydrochloric acid prompts the hydrolysis reaction to be complete so as to obtain iron oxide red of byproduct; and after solid-liquid separation, filtrate enriched with nickel and cobalt carries out sulfuration and sediment and chloride solution is recycled. The invention discards the method of pyrohydrolysis or high-temperature roasting in the traditional technique, reduces the energy consumption of removal of iron and the regeneration of hydrochloric acid, improves the leaching rate of the nickel and cobalt and simultaneously develops and utilizes base metal in the ore reasonably so as to increase the additional value of the technique.

Description

technical field

[0001] The invention belongs to the field of nonferrous metallurgy and relates to a method for comprehensively developing low-grade laterite nickel ore. technical background

[0002] Nickel is an important strategic metal, which is widely used in key materials and high-tech fields such as stainless steel, superalloys, catalysis, secondary batteries, and fuel cells. With the development of the world economy, high-grade nickel ore resources have been increasingly exhausted. How to effectively develop low-grade laterite nickel ore, which accounts for about 2 / 3 of the world's nickel reserves, has become a research hotspot in nickel metallurgy today.

[0003] Lateritic nickel ore is divided into limonite type and silicon magnesium nickel ore type. The limonite type is located in the upper part of the deposit, with high iron, low nickel, low silicon and magnesium, but relatively high cobalt content, and should be treated by hydrometallurgy. The silicon-magnesium-...

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