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A method for continuous electrochemical dissolution of palladium powder

An electrochemical and palladium powder technology, applied in the field of continuous electrochemical dissolution of palladium powder, can solve the problems of large consumption of hydrochloric acid and nitric acid, slow dissolution rate of metal Pt, environmental pollution, etc., and achieves simplified operation, high degree of automation, and improved product quality. The effect of purity

Active Publication Date: 2020-07-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: ① the prepared solution containing stable palladium concentration contains NO 3 - ions; ② the dissolution rate of metal Pt is slow and takes a long time; ③ the consumption of hydrochloric acid and nitric acid is large; and ④ a large amount of NO is produced x gas, pollution

Method used

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  • A method for continuous electrochemical dissolution of palladium powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1500 grams of palladium powder with a purity of 99.95% are evenly added to the figure 1 The bottoms of the six sets of left and right tanks are shown, and the size of each tank is 170mm×55mm×300mm. Wherein the bottom of the second partition 7 of each cell body is connected in a triangle, and the second partition 7 has a gap of 20 mm from the upper end surface of the electrolytic cell. The overflow hole is opened at a position 50mm away from the upper end surface of the electrolytic cell, and the diameter of the overflow hole is 10mm. Add 8mol / l superior grade pure hydrochloric acid from feed port 1 until all tanks are filled. A total of 12 cylindrical graphite electrodes with a spectral grade of Φ14 mm and a length of 300 mm are selected, fixed on the top cover 8, and the distance between the X and Y electrodes is 120 mm. The two ends of the X and Y electrodes in each tank are respectively loaded with 70V civil alternating current, and the magnitude of the alternating...

Embodiment 2

[0035] 1500 grams of palladium powder with a purity of 99.95% is evenly added to the bottom of the left and right six sets of tanks, each tank having a size of 180mm×50mm×320mm. Wherein the bottom of the second partition 7 of each cell body is connected in a triangle, and the second partition 7 has a gap of 20 mm from the upper end surface of the electrolytic cell. The overflow hole is opened at a position 70mm away from the upper end surface of the electrolytic cell, and the diameter of the overflow hole is 10mm. Add 8mol / l superior grade pure hydrochloric acid from feed port 1 until all tanks are filled. A total of 12 cylindrical graphite electrodes with a spectral grade of Φ14 mm and a length of 300 mm are selected, fixed on the top cover 8, and the distance between the X and Y electrodes is 120 mm. The two ends of the X and Y electrodes in each tank are respectively loaded with 60V civilian alternating current, and the magnitude of the alternating current is 5-25A. Now s...

Embodiment 3

[0037] 1500 grams of palladium powder with a purity of 99.95% is evenly added to the bottoms of the six groups of tanks on the left and right, and the size of each tank is 160mm×55mm×300mm. Wherein the bottom of the second partition 7 of each cell body is connected in a triangle, and the second partition 7 has a gap of 20 mm from the upper end surface of the electrolytic cell. The overflow hole is opened at a position 30mm away from the upper surface of the electrolytic cell, and the diameter of the overflow hole is 10mm. Add 10mol / l superior grade pure hydrochloric acid from feed port 1 until all tanks are filled. A total of 12 cylindrical graphite electrodes with a spectral grade of Φ12 mm and a length of 300 mm are selected, fixed on the top cover 8, and the distance between the X and Y electrodes is 120 mm. The two ends of the X and Y electrodes in each tank are respectively loaded with 80V civilian alternating current, and the magnitude of the alternating current is 5-25...

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Abstract

The invention discloses a continuous electrochemical dissolving method for palladium powder. The continuous electrochemical dissolving method comprises: 1, arranging an electrolytic cell, wherein theelectrolytic cell is divided into at least two tank bodies by a first separation plate arranged in the electrolytic cell, the first separation plate is provided with an overflow hole, the tank body isdivided into two electrode chambers by a second separation plate arranged in the tank body, the bottom portions of the two electrode chambers are communicated, and electrodes are respectively arranged in the two electrode chambers; and 2, adding palladium powder to the tank body, adding a hydrochloric acid solution, applying voltage on the electrode, continuously electrolyzing the palladium powder for a certain time, continuously supplementing hydrochloric acid, and discharging a palladium-containing product stream containing so as to form a product stream with characteristics of continuous hydrochloric acid feeding, continuous discharge and stable palladium concentration. According to the present invention, the preparation process is simple, a large amount of palladium powder can be continuously dissolved, the product has high purity, and the automation degree is high.

Description

technical field [0001] The invention belongs to the technical field of dissolving palladium powder, in particular to a method for continuously electrochemically dissolving palladium powder. Background technique [0002] Palladium, a member of the platinum group, the element symbol is Pd, similar in appearance to platinum, silver-white metallic luster, bright color, specific gravity 12, lighter than platinum, strong ductility, melting point 1555°C, hardness 4-4.5, higher than platinum slightly harder. The chemical properties are relatively stable, insoluble in organic acids, cold sulfuric acid or hydrochloric acid, and not easy to oxidize and lose luster under normal conditions. [0003] Palladium chloride, also known as palladium dichloride and sub-palladium chloride, is deliquescent, easily soluble in dilute hydrochloric acid, stable in air, and soluble in water, ethanol, acetone and hydrobromic acid. Used in the preparation of special catalysts and molecular sieves. Its...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/26C25B9/00
CPCC25B1/26C25B9/00
Inventor 王世亮吕顺丰张明森李彤秦燕璜
Owner CHINA PETROLEUM & CHEM CORP
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