Application principle of Kzu272 extractant
Release time：
2025-03-12
1 Experimental principle
useKzu272When extracting and separating nickel and cobalt, the first place is:Kzu272Pre-neutralized with alkali to convert to salt in order to maintain the desired during extractionPHValue. Neutralizers are availableNH4OHorNaOH。 Here's how it reacts:
HX＋NaOH＝NaX＋H2O
In order to remove excess sodium, nickel soap is made before separating nickel and cobalt, and the reaction is as follows:
2NaX＋NiSO4＝NiX2＋Na2SO4
The pre-made nickel soap is then thoroughly mixed with the aqueous solution to be extracted, that is, the extraction process.Kzu272The separation of nickel and cobalt from nickel soap extraction is as follows:
NiX2＋Co2+＝CoX2＋Ni2
Cobalt-loaded organic can be reversed by sulfuric acid and the reaction is as follows:
CoX2＋H2SO4＝CoSO4＋2HX
（where：HX—Kzu272）
Kzu272The biggest advantage is that it can realize the separation of nickel and cobalt in nickel-cobalt sulfate solution with very high nickel-cobalt ratio, and it has been successfully applied in some manufacturers at home and abroad. The comprehensive economic benefits are obvious.
2 Brief description of the process
Extraction Stage: Sodium soap1grade, turn nickel soap5grade, extraction7grade, washed nickel5grade, anti-extraction4grade, aqueous phase clarification3grade, organic clarification1level, total26Level.
The flow control system uses a high-level groove rotameter. All kinds of materials are continuously pumped into the high-level tank by the pump, and the high-level tank is kept full through the overflow pipe, so that the flow control is stable.
In order to maintain a certain extraction temperature, a titanium steam coil heating device or a plate heat exchanger is installed in the feed liquid and nickel sulfate high-level tank.
Kzu272The saponification adopts intermittent operation, and the industrial sodium hydroxide enters the saponification tank from the alkali high tank through the concentrated alkali metering tank. Saponification time4hours, using mechanical agitation. The organic soap is pumped into the organic high-level tank after soap, and a certain flow rate is controlled by the rotameter to enter the extraction box (which can effectively control the saponification crystallization).
Main operating conditions: Feed-liquid composition (g/l）：Ni125 Co0.80 Cu0.01 Fe0.01 PH5.5； Organic phases10-15％Kzu272＋90-85％GV-18ASolvent oils. Organically used32%The industrial sodium hydroxide homogeneous soap is made with a saponification rate40％。 Nickel sulfate is required to contain nickel30－35 g/l, diluted with pure water. Extraction temperature40—45°C, liquid temperature45℃。 Nickel washing solution is containedCo30 g/ltargetCoSO4The solution is prepared by self-produced cobalt sulfate solution and pure water. The reverse extract is100-130 g/lsulfuric acid solution, with93% concentration of industrial sulfuric acid is formulated with pure water.
The flow rate is adjusted according to the cobalt content of the feed solution and the color of the organic and aqueous phases of the extraction chamber. Flow ratio: feed liquid: organic phase: nickel washing solution: reverse extraction solution=1：1：0.05：0.05。 It is required that the nickel sulfate solution contains less than cobalt after nickel-cobalt separation0.02g/l, iron is less than0.001 g/l, copper less than0.001 g/l，PHfor5.5－6.0。 The cobalt sulfate solution contains less than nickel0.02 g/l，pHfor1- 2。
3 Production line control points
Driving order:Open the valve of the organic phase storage tank and open the valve of the liquid storage tank; The organic phase and the material liquid transfer pump are turned on sequentially, and the color of the organic phase outlet is adjusted according to the output color of each level.
Shutdown sequence: stop the water phase and organic phase transfer pumps, and close the tank valve. If the vehicle is shut down for a long time, it is recommended to clean up the materials in the tank.
Extraction stage of all levels of organic phase color: first1The grade organic export color is light green, first2The grade is light blue, the first3The grade is dark blue, the first4The grade is black and blue.
Inverted Segment Color: Organic Section1Grade dark blue, first2Grade blue, first3grade light blue, first4The grade is colorless or slightly yellowish, the first5-6The grade is colorless or slightly yellowish. Aqueous phase1grade dark red,2grade red,3grade pink,4The grade is pale red,5-6The grade is colorless or slightly reddish.
4 Experimental Effects
Extraction cobalt extraction rate 95％
Nickel and cobalt yield 99.8％
production capacity Daily processing of feed liquid 1140m3/d（47.5m3/h，0.80m3/min）
Solution composition (g/l） Ni 125 Co 0.68 Cu 0.01 Fe 0.01 PH 6.2
Compared to (O/A) extraction segment1：1, nickel washing section20：1, anti-extraction segment20：1
KingZu (Lanzhou) Fine Chemical Co., Ltd
KingZu (Lanzhou) Fine Chemical Co., Ltd. is a special extractant production base and new product R&D center of Tianjin KingZu Technology Co., Ltd. It is a scientific and technological enterprise specializing in the research and development, production and sales of mining extraction agents.
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