Method for normal-pressure phosphoric-acid leaching of nickel-cobalt and synchronous preparation of iron phosphate

A technology of laterite nickel ore and iron phosphate, applied in chemical instruments and methods, phosphorus compounds, process efficiency improvement and other directions, can solve the problems of large material loss, low nickel leaching, poor nickel-iron leaching selectivity, etc., and achieve small material loss , High leaching rate, the effect of increasing the added value of the product

Active Publication Date: 2017-07-28
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problems of large material loss, low nickel leaching, and poor selectivity of ferronickel leaching in the existing normal-pressure strong acid leaching. Method; aiming at one-step efficient separation of nickel-cobalt and iron, and co-production of FePO 4

Method used

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  • Method for normal-pressure phosphoric-acid leaching of nickel-cobalt and synchronous preparation of iron phosphate
  • Method for normal-pressure phosphoric-acid leaching of nickel-cobalt and synchronous preparation of iron phosphate
  • Method for normal-pressure phosphoric-acid leaching of nickel-cobalt and synchronous preparation of iron phosphate

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Embodiment 1

[0048] The laterite nickel ore was leached in 3mol / L phosphoric acid solution for 10h, the liquid-solid ratio was 10:1, and the leaching temperature was 80°C.

[0049] The leaching rate of nickel is 95.97%, that of cobalt is 87.61%, and that of iron is 12.19%. The nickel-iron leaching rate ratio is 7.87. The main chemical components of the leaching residue are shown in Table 2

[0050] Table 2 Main chemical composition of leaching residue / %

[0051] TF SiO 2

[0052] The phase analysis diagram of the leaching slag of this embodiment is shown in figure 1 ,Depend on figure 1 It can be seen that the leaching slag phase is FePO 4 2H 2 O.

Embodiment 2

[0054] The lateritic nickel ore was roasted at 400°C for 1 hour, and the calcined sand was leached in 3mol / L phosphoric acid solution for 2 hours, the liquid-solid ratio was 10:1, and the leaching temperature was 80°C.

[0055] The leaching rate of nickel was 98.13%, that of cobalt was 87.69%, and that of iron was 9.39%. The nickel-iron leaching rate ratio is 10.45

Embodiment 3

[0057] The laterite nickel ore was roasted at 400°C for 1 hour, and the calcined sand was leached in 3mol / L phosphoric acid solution for 3 hours, the liquid-solid ratio was 10:1, and the leaching temperature was 80°C.

[0058] The leaching rate of nickel is 98.43%, that of cobalt is 89.69%, and that of iron is 7.08%. The nickel-iron leaching rate ratio is 13.90. The main chemical components of the leaching residue are shown in Table 3

[0059] Table 3 Main chemical composition of leaching slag / %

[0060]

[0061]

[0062] The phase analysis diagram of the leaching slag of this embodiment is shown in figure 2 ,Depend on figure 2 It can be seen that the leaching slag phase is FePO 4 2H 2 O.

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Abstract

The invention discloses a method for the normal-pressure phosphoric-acid leaching of nickel-cobalt and the synchronous preparation of iron phosphate. The method comprises the following steps: subjecting laterite nickel ore to normal-pressure acid leading treatment, and then carrying out solid-liquid separation to obtain a leaching residue of iron phosphate and a leaching solution of enriched nickel-cobalt, wherein in the leaching process, phosphoric acid with a concentration of 1-3 mol / L is adopted; the adding amount of phosphoric acid is 1-3 times as much as the theoretical molar mass of metal elements in the leached transformed laterite nickel ore; and the laterite nickel ore is subjected to transformation at 300-400 DEG in advance before the acid leading treatment. The method is particularly suitable for the treatment of low-grade limonite-type laterite nickel ore; the nickel-cobalt recovery rate is high; the nickel-iron separation effect is good; and the leaching residue of iron phosphate is not only applicable to the preparation of iron phosphate lithium batteries but also utilized as a raw material for the manufacturing of catalysts and ceramics.

Description

technical field [0001] The invention belongs to the technical field of laterite nickel ore hydrometallurgy, and in particular relates to a method for leaching nickel and cobalt from laterite nickel ore with atmospheric pressure phosphoric acid and co-producing iron phosphate. Background technique [0002] Laterite nickel ore is the main source of nickel production at present. Limonite-type laterite nickel ore has low nickel grade (about 1%), high iron content (generally greater than 40%), and relatively low magnesium content (about 5%). Wet leaching is mainly used to extract valuable elements such as nickel and cobalt. Compared with pyrometallurgy, the wet leaching process has low energy consumption, simple process, low investment cost, and has obvious advantages such as recovery of cobalt in laterite nickel ore. [0003] The acid leaching process in laterite nickel ore mainly includes high pressure acid leaching and atmospheric pressure acid leaching. High-pressure acid l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C01B25/37
CPCC01B25/375C01P2006/80C22B23/0415Y02P10/20
Inventor 李光辉朱忠平周群罗骏彭志伟饶明军姜涛张元波郭宇峰张鑫王江彭建辉
Owner CENT SOUTH UNIV
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