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Recovery method of rough ferro-nickel alloy and application of recovery method

A recovery method and a nickel-iron alloy technology are applied in the recovery field of crude nickel-iron alloys, which can solve the problems of iron concentrates with a purity of less than 80%, and achieve the effects of simple operation, easy control of technical conditions, and short technological process.

Inactive Publication Date: 2021-06-11
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current ammonia leaching process, if laterite ore is directly used as a raw material, the recovery rate of nickel metal is generally about 80%, and if nickel-iron alloy powder is used together with conventional ammonium carbonate and ammonium bicarbonate systems, the leaching rate is generally about 90%. And the purity of the obtained iron concentrate is less than 80%

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  • Recovery method of rough ferro-nickel alloy and application of recovery method

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Embodiment 1

[0041] The recovery method of the crude nickel-iron alloy of the present embodiment may further comprise the steps:

[0042] (1) Crude nickel-iron alloy (from a laterite nickel ore processing plant product in Indonesia) (composition in the crude nickel-iron alloy is: Fe 64%, Ni 33%, C 1.2%, S 1.7%) 100g is broken, and then Use a ball mill to mill until the particle size of the nickel-iron alloy is less than 100 mesh (>95%);

[0043] (2) The ammonia water and ammonium sulfate system is configured into a leachate, and added to the nickel-iron alloy after ball milling, the liquid-solid ratio of the leachate and the nickel-iron alloy is 3:1mL / g, and the total ammonia concentration is 6mol / L, wherein the sulfate radical and the ammonia The root molar concentration ratio is 1:2, put it into a closed reaction container, and the stirring speed is 400r / min. After 30 minutes of reaction, start to pass the air and heat it. After the reaction, the pH of the slurry is detected to be 9.8, ...

Embodiment 2

[0054] The recovery method of the crude nickel-iron alloy of the present embodiment may further comprise the steps:

[0055] (1) Take 100g of crude nickel-iron alloy (from a laterite nickel ore processing plant in Indonesia) (the composition of the nickel-iron alloy is: Fe64%, Ni 33%, C 1.2%, S 1.7%) 100g is crushed, and then ball mill is used Ball milling until the particle size of the nickel-iron alloy is less than 100 mesh (the particle size is less than 100 mesh and the proportion is >95%);

[0056] (2) The aqueous ammonia and ammonium sulfate system is configured into a leach solution, which is added to the above-mentioned nickel-iron alloy after ball milling. The liquid-solid ratio of the leach solution and the nickel-iron alloy is 4:1mL / g, and the total ammonia concentration is 5mol / L, wherein the sulfate radical and the ammonia The root molar concentration ratio is 1:3, put it into a closed reaction container, and the stirring speed is 400r / min. After the reaction for ...

Embodiment 3

[0066] The recovery method of the crude nickel-iron alloy of the present embodiment may further comprise the steps:

[0067] (1) Get the crude nickel-iron alloy (the composition in the nickel-iron alloy is: Fe 64%, Ni 33%, C 1.2%, S 1.7%) 100g is crushed, and then ball milled by a ball mill until the nickel-iron alloy particle size is less than 100 mesh (grain diameter less than 100 meshes accounted for >95%);

[0068] (2) The ammonia water and ammonium sulfate system is configured into a leach solution, and added to the nickel-iron alloy after ball milling, the liquid-solid ratio of the leach solution and the nickel-iron alloy is 5:1mL / g, and the total ammonia concentration is 7mol / L, wherein the sulfate radical and the ammonia The root molar concentration ratio is 1:4, wherein the solution pH=10.8 is recorded, put it into a closed reaction vessel, and the stirring speed is 500r / min, and after 30 minutes of reaction, air is started and heated, the flow rate of the air is 2.5L...

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Abstract

The invention belongs to the field of nonferrous metallurgy, and discloses a recovery method of rough ferro-nickel alloy and application of the recovery method. The recovery method comprises the following steps: crushing and ball-milling the crude ferro-nickel alloy, adding ammonium salt and ammonia water, mixing and stirring, heating and pressurizing for ammonia leaching reaction to obtain slurry, and filtering to obtain nickel complex leaching solution and iron slag; adding a reducing agent into the iron slag for reduction roasting to obtain iron ore concentrate; and adding an alkaline buffer solution into the nickel complex leaching solution to adjust the pH value for alkaline reaction, and heating for ammonia distillation to obtain nickel sulfate. According to the recovery method, the rough ferro-nickel alloy is subjected to crushing and ore grinding, pressurized ammonia leaching, filtering and evaporative crystallization, a sulfuric acid system is adopted in pressurized ammonia leaching, and after ammonia leaching and ammonia distillation, high-value class I nickel sulfate hexahydrate (the purity is 99.7%) and high-grade marketable refined iron powder (the recovery rate is larger than 99.99%, and the purity is larger than 98%) can be directly obtained.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgy, and in particular relates to a recovery method and application of crude nickel-iron alloy. Background technique [0002] Nickel is an important strategic metal, which is widely used in key materials and high-tech fields such as stainless steel, superalloys, and fuel cells. At present, the source of nickel resources is mainly nickel sulfide ore and nickel oxide ore (ie laterite nickel ore) in crustal resources. ) two, of which 30% are nickel sulfide ore and 70% are laterite nickel ore. And with the rapid development of the stainless steel industry, the production of nickel is in short supply, and the high-quality nickel sulfide ore is gradually exhausted, which promotes the mining and application of laterite nickel ore to become more and more extensive. [0003] Since the beginning of the 21st century, the rise of the new energy industry and the saturation of the stainless steel industry have...

Claims

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Application Information

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IPC IPC(8): C22B3/14C22B23/00C21B13/00
CPCC22B3/14C22B23/0446C21B13/0066Y02P10/20
Inventor 邓浩臻谌志新陈若葵阮丁山乔延超何芳李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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