Method for producing electrolysis nickel from nickel-cobalt concentrate of laterite

A technology for enrichment and laterite ore, which is applied in the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of low metal recovery rate, high production cost and high residual rate, and achieve high metal recovery rate and suitable raw materials. Wide range of effects and simple process

Inactive Publication Date: 2009-10-28
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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Problems solved by technology

[0004] In the existing electrolytic nickel production process, the "nickel sulfide anode electrolysis" process has good electrolytic nickel quality, but the loss of nickel is large and the residual electrode rate is high; "selective leaching of high matte nickel sulfuric acid" is a classic process of nickel wet refining. It has the advantages of high comprehensive recovery rate, low equipment corrosion, etc., and the process is more flexible; the main disadvantage of "high matte nickel chlorination refining" is that the equipment is highly corrosive and the chlorine gas recovery system is complicated; "crude nickel anode electrolytic refining" is nickel The traditional process of smelting, after high-nickel matte is oxidized and roasted, it is reduced and smelted in an electric furnace or a reverberatory furnace to cast a thick nickel anode, and electrolysis is used to produce electric nickel
[0005] So far, in the development and utilization of laterite ore, the wet smelting high-pressure acid leaching, atmospheric pressure stirring leaching or heap leaching process can obtain the nickel-cobalt enrichment produced by smelting, and the grade of the nickel-cobalt enrichment is at 25 % to 35%, and its nickel-cobalt enrichment includes nickel hydroxide-cobalt enrichment, nickel-cobalt carbonate enrichment, nickel-cobalt oxide enrichment, nickel-cobalt sulfide enrichment; but the production of nickel-cobalt enrichment Electronic nickel is not yet a mature process
Due to the high content of impurities such as magnesium in the nickel-cobalt concentrate produced by the treatment of nickel laterite ore, it is difficult to solve the problem of magnesium accumulation by direct wet treatment, with high impurities, low metal recovery rate and high production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The nickel-cobalt enrichment (Ni 24.80%, Co 1.16%, Mg 3.42%, Mn 3.01%, Fe 1.55%) (dry basis) was dried in an oven at 95°C until the water content was 8%. Weigh 100g of the dried material, add 10g of coke and 10g of quartz, pretreat it in a muffle furnace at 900°C for 2 hours, and produce 69.6g of the reduced material. The pretreated material was pyrolyzed at 1600°C for 0.5h to produce 40g of slag (Ni 1.64%, Co 0.042, Si 14.6, Mg 28.8, Mn 14.3), 35g of nickel-cobalt enrichment, and the composition was: Ni 85.5%, Co 4.03%, Si 0.28%, Mg<0.005%, Mn 4.2%.

[0034] The nickel-cobalt material is electrolyzed under the condition of cell voltage 1.8-2.2V, the electrolysis temperature is 60-65°C, the current efficiency of cathodic deposition of nickel is 98.6%, the current efficiency of thick nickel anode dissolution is 82%, and 30g of qualified electrolytic nickel is obtained. The anolyte is returned to use after oxidation neutralization to remove iron, sulfide to remove copper...

Embodiment 2

[0036] The nickel-cobalt enrichment (Ni 20.15%, Co 0.95%, Mg 2.85%, Mn 2.69%, Fe 2.01%) (dry basis) was dried in an oven at 95°C until the water content was 12%. Weigh 100g of the dried material, add 5g of coke and 5g of quartz, pretreat it in a muffle furnace at 300°C for 6h, and produce 72.35g of the reduced material. The pretreated material was pyrolyzed at 1000°C for 6 hours to produce 42g of slag (Ni 1.22%, Co 0.035, Si 12.34, Mg25.6, Mn 12.3), 29g of nickel-cobalt enrichment, and the composition was: Ni 84.9%, Co 3.85%, Si 0.25%, Mg<0.005%, Mn 2.1%.

[0037] The nickel-cobalt material is electrolyzed under the condition of cell voltage 1.8-2.2V, the electrolysis temperature is 60-65°C, the current efficiency of cathodic deposition of nickel is 98.5%, the current efficiency of thick nickel anode dissolution is 81%, and 26g of qualified electrolytic nickel is obtained. The anolyte is returned to use after oxidation neutralization to remove iron, sulfide to remove copper a...

Embodiment 3

[0039]The nickel-cobalt enrichment (Ni 25.68%, Co 1.13%, Mg 2.49%, Mn 2.87%, Fe 2.56%) (dry basis) was dried in an oven at 95°C until the water content was 10%. Weigh 100g of the dried material, add 10g of coke and 10g of quartz, pretreat it in a muffle furnace at 1200°C for 1 hour, and produce 68.54g of the reduced material. The pretreated material was pyrolyzed at 1200°C for 3 hours to produce 39g of slag (Ni 1.43%, Co 0.028, Si 12.34, Mg 23.45, Mn 13.6), 28g of nickel-cobalt enrichment, and the composition was: Ni 85.67%, Co 4.03%, Si 0.34%, Mg<0.005%, Mn 2.6%.

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Abstract

The invention relates to a method for producing electrolysis nickel from nickel-cobalt concentrate of laterite, and relates to a production method of electrolysis nickel, particularly a method for producing the electrolysis nickel by utilizing the laterite. The method is characterized by comprising the following steps of: carrying out drying and dehydration on the nickel-cobalt concentrate of the laterite, adding coke and quartz, mixing materials, producing pellet material, pre-treating at the temperature of 300 to 1000 DEG C, carrying out high-temperature treatment at the temperature of 1000 to 1600 DEG C, separating slag phase, producing electrolysis anode and producing the electrolysis nickel by electrolysis. The method utilizes the nickel-cobalt concentrate produced in the smelting processing of nickel laterite and adopts the technique of drying, pretreatment, high-temperature decomposition and electrolysis to produce the electrolysis nickel, and has the advantages of high metal recovery rate and simple process; simultaneously the process is also applicable to processing nickel-cobalt sulphide and nickel-cobalt waste; and the method has the characteristics of wider material applicability, little investment, low production cost, high nickel-cobalt recovery rate, little environmental pollution and the like.

Description

technical field [0001] The invention relates to a method for producing electrolytic nickel from nickel and cobalt enrichment of laterite ore, which relates to a production method of electrolytic nickel, in particular to a method for producing electrolytic nickel by using laterite ore. Background technique [0002] Nickel is an important strategic material, but there is a shortage of nickel resources in my country and a large gap between supply and demand, and most raw materials or finished products need to be imported from abroad. [0003] At present, most of the electric nickel is made of sulfide ore as raw material, which is rough refined into high nickel matte or sulfide anode, and then refined to produce electric nickel. The process mainly includes four types: (1) "direct electrolysis of nickel sulfide anode", (2) "selective leaching-purification-electrowinning of high nickel matte sulfuric acid", (3) "high nickel matte chlorination refining" and (4) "nickel concentrate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/08
CPCY02P10/20
Inventor 蒋开喜钟晓云王海北李桂生林江顺朱康玲赵磊丁嘉榆冯亚平涂春根蒋训雄兰玮峰张邦胜戴正文刘三平李海东汪胜东李家裕王玉芳
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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