Bis(2,4,4-trimethylpentyl) phosphinic acid ( ZD272/Cyanex 272/ Lonquest 290)

Properties

♦ High selectivity: 

Bis(2,4,4-trimethylpentyl) phosphinic acid (ZD272)  extractanthas a high degree of selectivity for

specific metal ions, such as cobalt, nickel, and rare earth elements. It can accurately extract target ions

in a complex metal ion system while excluding other non-target ions. For example, under appropriate

conditions, it has a low or no extraction performance for calcium ions and can preferentially extract

cobalt over calcium, eliminating the formation of gypsum contaminants in the extraction system.

♦  Stable extraction performance:

During the extraction process Bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex272) extractant  is less

affected by changes in conditions such as temperature and pH value, ensuring the consistency and

reliability of the extraction process extraction process.

♦  Low extraction acidity:

Compared with other extractants, it requires a lower acidity of the aqueous phase when extracting metal

ions. This is beneficial for reducing the consumption of acid, lowering production costs, and minimizing

environmental impact.

♦  Easy stripping:

The metal ions extracted can be easily recovered through the stripping process, which improves the

efficiency of the extraction-stripping cycle and is conducive to the recycling of metal ions and the

conservation of resources.

♦  Wide application range:

Bis(2,4,4-trimethylpentyl) phosphinic acid (Lonquest 290) is not only suitable for the extraction and

separation of metals such as cobalt and nickel but also widely used in the extraction and separation

of rare earth elements. It is also applicable to the extraction and separation of other metal systems

such as gallium, indium, molybdenum, germanium, and zirconium.

♦  Good safety

It has relatively low toxicity, causing less harm to the environment and human body. It also shows good

stability during transportation and storage.

♦  Good solubility

Bis(2,4,4-trimethylpentyl) phosphinic acid (Lonquest 290) can be completely dissolved in aromatic or

aliphatic diluents to form a homogeneous extraction system, which is beneficial to the progress of the

extraction process and the improvement of extraction efficiency.

♦   Strong chemical stability:

ZD272 is very stable in terms of heat resistance and hydrolysis resistance. For example, in an extraction

equilibrium experiment with cobalt/nickel sulfate solution at pH = 5 and 50 °C, after repeated contact

for a long time, the extractant does not degrade, and the selectivity for cobalt/nickel does not change.

 

Applications

♦  Separation of cobalt and nickel from the leaching solution of cobalt-nickel-containing ores: 

In hydrometallurgy, many cobalt-nickel-containing ores, after treatment such as acid leaching,

result in a leaching solution containing various metal ions, such as cobalt, nickel, iron, and copper.

By using ZD272 extractant and controlling appropriate conditions such as pH value, cobalt ions can

be selectively extracted into the organic phase, while nickel ions remain in the aqueous phase, thus

achieving the effective separation of cobalt and nickel. For example, in some cobalt ore hydrometallurgical

plants in Africa, ZD272 extractant is widely used to extract cobalt from the cobalt-nickel mixed solution,

laying the foundation for the subsequent production of cobalt products.

 

♦  Separation of cobalt and nickel in the recycling of waste batteries:

With the development of industries such as new energy vehicles, the number of waste lithium-ion

batteries is increasing. Waste lithium-ion batteries contain a large amount of valuable metals such

as cobalt and nickel. When treating and recycling waste batteries, after leaching the metal components

in the batteries, ZD272 extractant can be used to efficiently separate cobalt and nickel, realizing the

recycling of resources.

 

♦  Separation of rare earth elements from the leaching solution of rare earth ores:

The solution obtained after leaching rare earth ores contains a variety of rare earth element ions. ZD272

extractant can be used to selectively extract certain rare earth elements from these mixed rare earth ion

solutions. For example, when separating heavy rare earth elements such as yttrium from the leaching

solution of southern ionic rare earth ores, ZD272 can achieve good separation results, improving the

purity and recovery rate of heavy rare earth elements.

 

♦   Separation of rare earth elements in the recycling of rare earth permanent magnet materials:

In the recycling process of waste rare earth permanent magnet materials, ZD272 can be used to separate

key rare earth elements such as neodymium and praseodymium from the recovered mixed rare earth

solution. For example, a synergistic extraction system developed by Shandong

 

♦  Extraction of metals such as gallium, indium, molybdenum, germanium, and zirconium:

In the processing of some manganese ores and related industrial productions, solutions containing

metal ions such as manganese, magnesium, and calcium are generated. Under certain conditions,

ZD272 extractant can be used to achieve the separation of manganese from magnesium and calcium.

For example, under specific pH values and extraction conditions, ZD272 has a certain selective binding

ability to magnesium and calcium ions, so magnesium, calcium, and manganese can be separated.

 

♦  Separation of manganese from magnesium and calcium:

In some by-products of non-ferrous metal smelting or specific ore types, there are rare metals such

as gallium, indium, molybdenum, germanium, and zirconium. C272 extractant can be used to extract

and separate these rare metals from these complex systems. For example, in the beneficiation and smelting

process of some molybdenum ores, using C272 extractant can effectively separate molybdenum from the

molybdenum-containing solution, improving the recovery rate and purity of molybdenum.

 

Process

♦ Raw Material Preparation

Sodium hypophosphite and diisobutylene are used as the main raw materials, and azobisisobutyronitrile

(AIBN) is used as the initiator.

♦   Reaction Conditions:

he molar ratio of diisobutylene to sodium hypophosphite is 2.5:1. The reaction is carried out in a stainless steel

high-pressure reactor at 6 MPa and 135°C for 32 hours.

♦  Post-treatment:

After the reaction, the product is obtained through processes such as alkali washing, acidification, drying and

vacuum rotary evaporation.

♦ Drying and Packaging

The purified ZD272extractant is typically dried to remove any residual moisture. Then, it is

packaged in suitable containers, such as bottles or drums, ensuring proper sealing to maintain its

quality and prevent contamination. The extractant is often stored and transported in a dry and

cool environment to maintain its stability.

 

Inspection

♦ Inspection process

1. Incoming inspection: The main raw materials,are inspected for their content, appearance

and other main properties.

2. Feeding inspection: the principle of raw material feeding is first-in-first-out, and the appearance

of the main raw materials is randomly inspected according to whether there is a big change in the

storage conditions before feeding.

3. Batch sampling in the production process: During the production process, the main indexes of

each batch of products: content and acid value will be examined three times in different time periods.

4. Storage Inspection: Each batch (3tons) is inspected before storage.

5. Outbound inspection: According to the quantity demanded by customers, the products will be

sampled and inspected.

6. Pre-shipment inspection: according to customer’s requirement, third party inspection can be carried

out on the products before shipment.

♦ Inspection Method

Physical Appearance: Visual inspection

Purity Analysis:Gas chromatography (GC)

Acid Value:Potentiometric titration

Water Content:Moisture analyzers

Refractive Index:Refractometer

Density:Density meter

Marking, packaging, shipping and storage

♦ Marking

Each batch of products should be accompanied by a certificate of conformity, including: the name of the

manufacturer, the name of the product, the production batch number, the net weight per barrel, the quality

level and the implementation of the standard number.weight, quality grade and implementation standard

number.

♦ Packing

Packed in clean and dry plastic drums, net weight 190±0.3kg per drum or 900±0.5kg, compressed and

sealed after each batch.

♦ Transportation

This product is packed in plastic drums, during transportation and loading/unloading, it should be carefully

and gently put down, and prevent from impact.

♦ Storage

The storage place should be cool, dry and ventilated. Do fireproof and rainproof.