A palladium extractant and a method for preparing the same

Abstract

This invention provides a palladium extractant and its preparation method. The extractant is prepared from the following raw materials in weight percentages: diisoamyl sulfide: 20-50%, isooctanol: 5-15%, and methyl nonanoate: 50-70%. This palladium extractant has a large capacity, low toxicity, high extraction efficiency, virtually no flocculent formation during back-extraction, stable performance, and long lifespan. The palladium extractant can achieve an extraction efficiency of 99.98%, and the back-extraction rate can reach over 98%.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical reagent technology and relates to a palladium extractant and its preparation method. Background Technology

[0002] In precious metal production, palladium currently uses traditional extractants both domestically and internationally. Traditional palladium extractants are formulated by combining diisopentyl sulfide, diethylbenzene, and n-dodecane in a ratio of 3:2:5. However, traditional extractants have the following problems: small extraction capacity, low efficiency, large amount of flocculent material during back-extraction, short lifespan, and easy blockage of pipelines in the later stages, affecting normal production. Operators also face significant health risks due to prolonged exposure to the highly toxic environment of diethylbenzene and n-dodecane. Summary of the Invention

[0003] The purpose of this invention is to address the problems of existing extractants in the background art, such as small extraction capacity, low efficiency, excessive flocculent matter during back-extraction, and harm to the health of operators, by providing a palladium extractant and its preparation method.

[0004] Therefore, the present invention adopts the following technical solution:

[0005] A palladium extractant comprising, by mass fraction: diisoamyl sulfide: 20-50%, isooctyl alcohol: 5-15%, methyl nonanoate: 50-70%, the sum of the above components reaching 100%.

[0006] The present invention also discloses a method for preparing the above-mentioned palladium extractant, which involves first adding diisoamyl sulfide to a reaction vessel, heating to 20-50°C and stirring for 3-7 minutes, adding YW and stirring for 3-7 minutes, and then adding isooctyl alcohol and stirring for 3-7 minutes to obtain a crude palladium extractant; washing the crude palladium extractant with sodium chloride solution to obtain an oil phase and an aqueous phase, wherein the oil phase is the finished palladium extractant.

[0007] Further, wash with a 40% sodium chloride solution.

[0008] Furthermore, the crude palladium extractant was washed twice with a sodium chloride solution.

[0009] The mechanism for preparing palladium extractant in this invention is as follows: After changing the reagent ratio, isooctanol and methyl nonanoate can reduce the specific gravity and viscosity of the extractant more effectively than diethylbenzene and n-dodecane, which is more conducive to the flow and separation of the two phases, resulting in a higher purity extractant. Extensive experiments have shown that under 30°C conditions, adding methyl nonanoate to diisopentyl sulfide, mixing and stirring for 5 minutes, then mixing and stirring with isooctanol for another 5 minutes, and finally washing twice with 40% sodium chloride solution, results in a palladium extractant with higher extraction efficiency, more stable extraction performance, and no flocculent formation.

[0010] The beneficial effects of this invention are as follows:

[0011] (1) Isooctanol replaces diethylbenzene as a diluent in the extractant. Compared with diethylbenzene, isooctanol is non-toxic and has a better dilution effect. Methyl nonanoate is used instead of n-dodecane as a solvent. Methyl nonanoate has a better solubility and is non-toxic.

[0012] (2) This extractant produces almost no flocculent material during the back-extraction process, its service life is increased by more than 2 times, the production operation will not cause pipeline blockage, the production efficiency is high, the toxicity is low, and it has good promotion value and economic benefits. Detailed Implementation

[0013] The present invention will be described in detail below with reference to embodiments:

[0014] Implementation 1

[0015] A palladium extractant comprising, by mass fraction: diisoamyl sulfide: 30%, isooctyl alcohol: 10%, and methyl nonanoate: 60%.

[0016] Preparation method:

[0017] A palladium extractant and its preparation method are disclosed. First, diisoamyl sulfide is added to a reaction vessel, heated to 30°C, and stirred for 5 minutes. Then, methyl nonanoate is added and stirred for another 5 minutes. Finally, isooctyl alcohol is added and stirred for 5 minutes to obtain a crude palladium extractant. The crude palladium extractant is then continuously washed on both sides with a 40% sodium chloride solution to obtain an oil phase and an aqueous phase. The oil phase is the finished palladium extractant.

[0018] The prepared palladium extractant was compared with the existing palladium extractant under the same conditions. The statistical results are shown in Table 1.

[0019] Table 1

[0020]

[0021] The analysis and statistics show that the extraction efficiency of the new palladium extractant is 0.64 percentage points higher than that of the original palladium extractant, and the back-extraction rate is also 1.31 percentage points higher. There is basically no flocculent material generated during the operation process, and the probability of generating waste extractant is also very low. Its performance in all aspects is superior to that of the original palladium extractant.

[0022] Example 2

[0023] A palladium extractant comprising, by mass fraction: diisoamyl sulfide: 30%, isooctyl alcohol: 10%, methyl nonanoate: 60%.

[0024] Preparation method:

[0025] A palladium extractant and its preparation method are disclosed. First, diisoamyl sulfide is added to a reaction vessel, heated to 30°C, and stirred for 5 minutes. Then, methyl nonanoate is added and stirred for another 4 minutes. Finally, isooctyl alcohol is added and stirred for 4 minutes to obtain a crude palladium extractant. The crude palladium extractant is then continuously washed with a 40% sodium chloride solution to obtain an oil phase and an aqueous phase. The oil phase is the finished palladium extractant.

[0026] The prepared palladium extractant was compared with the existing palladium extractant under the same conditions. The statistical results are shown in Table 2.

[0027] Table 2

[0028]

[0029] As shown in Table 2, the extraction efficiency of the new palladium extractant is 0.57 percentage points higher than that of the original palladium extractant, and the back-extraction rate is also 0.96 percentage points higher. There is basically no flocculent material generated during the operation process, the extraction performance is stable, and all aspects of the performance are superior to those of the original palladium extractant.

[0030] The method described in this invention has been successfully applied to the palladium extraction production line of Jinchuan Company. After adopting this method, the company can save 1.8 tons of palladium extractant and 900,000 yuan in production costs annually while maintaining the same production capacity. At the same time, there is basically no flocculent material generated during the palladium extraction process, and the equipment failure rate is reduced. The service life of the new palladium extractant is increased by 2 times.

Claims

1. A method for preparing a palladium extractant, characterized in that, The palladium extractant is prepared from the following raw materials in weight percentages: diisoamyl sulfide: 20-50%, isooctanol: 5-15%, methyl nonanoate: 50-70%, and the sum of the above components reaches 100%. The preparation method comprises the following steps: first, adding diisopentyl sulfide to a reaction vessel and heating it to 20-50°C and stirring for 3-7 minutes; then adding methyl nonanoate and stirring for 3-7 minutes; finally, adding isooctyl alcohol and stirring for 3-7 minutes to obtain crude palladium extractant; and then washing the crude palladium extractant twice with a 40% sodium chloride solution to obtain an oil phase and an aqueous phase, wherein the oil phase is the finished palladium extractant.

Images