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Method for selectively leaching nickel sulfide concentrate under mild pressure

A nickel sulfide and selective technology, applied in the field of metallurgy, can solve the problems of long leaching time, large loss of valuable metals, long process flow, etc., and achieve the effect of effective acquisition and utilization and reduction of oxidation

Active Publication Date: 2022-02-08
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pyrometallurgy produces matte by smelting, blowing slagging and refining to obtain high-nickel matte, and then separates nickel and copper after flotation; it has long process flow, high melting temperature, and large loss of valuable metals, especially cobalt. Problems such as low recovery rate
Common wet treatment methods include atmospheric pressure-air pressure leaching and high oxygen-high temperature pressure leaching. The former can leach nickel and cobalt while leaving copper in the slag, but the leaching rate of nickel and cobalt is not high, and the leaching time is long. The leaching solution contains high iron content; the latter has a high leaching rate of nickel and cobalt, and the iron can be effectively retained in the slag, but most of the copper is in the leaching solution, which is not conducive to the separation of nickel, cobalt and copper, and the reaction temperature is high and the pressure is high. high

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  • Method for selectively leaching nickel sulfide concentrate under mild pressure

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Comparison scheme
Effect test

Embodiment 1

[0053] like figure 1 As shown, the present embodiment provides a method for selective leaching of nickel sulfide concentrate under gentle pressure, and the specific steps are as follows:

[0054] Take 50 g of nickel sulfide concentrate (containing 1% of other minerals) whose main components are 7% chalcopyrite, 15% pentlandite, 40% pyrrhotite, 25% pyrite and 12% gangue (containing 1% of other minerals). After grinding, add 500 mL of water to make a slurry, and 90% of the particle size is less than 75 μm. Add 1 g of sodium wood sulfonate and 4.4 g of 98% concentrated sulfuric acid to the ground pulp, and stir to obtain a mixed slurry. Put the mixed slurry into an autoclave, introduce oxygen, and discharge excess air, control the reaction temperature to 140°C, the oxygen partial pressure to 0.2±0.05 MPa, and the leaching time to be 3 h. After leaching, the nickel leaching rate was 95.20%, the cobalt leaching rate was 95.11%, the copper leaching rate was 38.87%, and the iron le...

Embodiment 2

[0057] This embodiment provides a method for selective leaching of nickel sulfide concentrate under gentle pressure, the specific steps are as follows:

[0058] Take 100 g of nickel sulfide concentrate (containing 1% of other minerals) whose main components are 6% chalcopyrite, 15% pentlandite, 40% pyrrhotite, 25% pyrite and 13% gangue. After grinding, add 400 mL of water to make a slurry, and 90% of the particle size is less than 75 μm. Add 1.5 g of sodium wood sulfonate and 9 g of 98% concentrated sulfuric acid to the ground pulp, and stir to obtain a mixed slurry. Put the mixed slurry into an autoclave, introduce oxygen, and discharge excess air, control the reaction temperature to 140°C, the oxygen partial pressure to 0.2±0.05 MPa, and the leaching time to 2 h. After leaching, the nickel leaching rate was 95.07%, the cobalt leaching rate was 95.05%, the copper leaching rate was 38.84%, and the iron leaching rate was 7.79%.

Embodiment 3

[0060] This embodiment provides a method for selective leaching of nickel sulfide concentrate under gentle pressure, the specific steps are as follows:

[0061] The main components are 4% chalcopyrite, 29% pentlandite, 32% pyrrhotite, 21% pyrite and 13% gangue nickel sulfide concentrate 200 g (containing 1% other minerals), add water 1000 86% of the pulp obtained after milling milled milliliters was smaller than 75 μm. Add 3.5 g of sodium wood sulfonate and 10 g of 98% concentrated sulfuric acid to the ground pulp, and stir to obtain a mixed slurry. Put the mixed slurry into an autoclave, introduce oxygen, and discharge excess air, control the reaction temperature to 135°C, the oxygen partial pressure to 0.2±0.05 MPa, and the leaching time to 4 h. After leaching, the nickel leaching rate was 95.05%, the cobalt leaching rate was 95.14%, the copper leaching rate was 29.54%, and the iron leaching rate was 13.87%.

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Abstract

The invention provides a method for selectively leaching nickel sulfide concentrate under a mild pressure, and relates to the field of metallurgy. The method comprises the following steps: carrying out ore grinding treatment on the nickel sulfide concentrate to obtain ore pulp, mixing the ore pulp with a dispersing agent and sulfuric acid to obtain a mixture, carrying out oxygen pressure leaching, and carrying out solid-liquid separation to obtain a leachate and leaching residues. The temperature of oxygen pressure leaching ranges from 120 DEG C to 150 DEG C, and the oxygen partial pressure ranges from 0.1 MPa to 0.8 MPa. According to the method for selectively leaching the nickel sulfide concentrate under the mild pressure, the nickel sulfide concentrate is leached under the mild condition through the low temperature and oxygen partial pressure, the nickel and cobalt leaching rate is larger than 95%, the iron leaching rate is smaller than 15%, and the copper leaching rate is smaller than 40%; little oxidation of pyrite and chalcopyrite can be controlled; and the equipment requirement is low, the safety is high and the cost is low.

Description

technical field [0001] The application relates to the field of metallurgy, in particular to a method for selective leaching of nickel sulfide concentrate under mild pressure. Background technique [0002] In addition to pentlandite, nickel sulfide concentrate also contains a part of pyrrhotite and pyrite, as well as a small amount of chalcopyrite and cobalt sulfide. Nickel, cobalt, and copper are commonly recovered by pyroprocessing and wet processing. Pyrometallurgy produces matte by smelting, blowing slagging and refining to obtain high-nickel matte, and then separates nickel and copper after flotation; it has long process flow, high melting temperature, and large loss of valuable metals, especially cobalt. Problems such as low recovery rate. Common wet treatment methods include atmospheric pressure-air pressure leaching and high oxygen-high temperature pressure leaching. The former can leach nickel and cobalt while leaving copper in the slag, but the leaching rate of ni...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B23/00C22B15/00C21B15/00
CPCC22B3/08C22B23/043C22B15/0071C21B15/00Y02P10/20
Inventor 王海北谢铿杨必文王玉芳刘三平王德卿
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD