DE1583886A1 - Process for making sulfur-containing carbonyl nickel pellets - Google Patents

Description

1533386 Dipl.-Ing. H. Sauerland ■ Dr.-Ing. R. King

Patentanwalts · <* οαα Düsseldorf · Cecilisnallee 76 ■ Telephone 43 273a

P 15 83 886.5-24 January 9, 1970

================ IIl / Sch / 23 201

International Nickel Limited, Thames House, Millbank, London, SW 1, UK

"Process for the production of sulfur-containing carbonyl nickel pellets"

The electrodeposition of nickel from aqueous baths containing one or more nickel salts results special advantages from the use of sulfur-containing carbonyl nickel pellets. The present invention relates refer to a method of making these pellets.

Nickel carbonyl pellets are commonly used after known Mondr process, in which nickel carbonyl thermally is decomposed, manufactured The pellets consist of a nickel of great purity, whereby special precautions are taken will avoid any contamination of the nickel with sulfur, since sulfur affects the ductility of the nickel « As a result, the sulfur content of nickel pellets is lower usually under $ 0.001.

According to the invention it is now proposed to use sulfur-containing Niokel carbonyl pellets by decomposing at the same time of nickel carbonyl and carbon oxysulfide (OOS). The rate of decomposition guarantees that nickel and sulfur will be on the Pellet3 in one of them Share in the gas corresponding ratio. Hence, only such an amount is needed Carbon oxysulfide introduced into the decomposition chamber to ensure that the finished pellets achieve the desired

009837/0269 original "NcrrjT zz

ι ό 3:; 8 6

have skin content.

The effectiveness of the anode pellets is determined by the improved very low sulfur content introduced according to the invention on processes; so is the sulfur content advantageously at least $ 0.005. Higher Sulfur Haita result in better loosening, but also increase the amount of non-metallic sludge in the anode sludge. Therefore should the sulfur content will not exceed $ 0.07 or $ 0.1, and preferably will not exceed $ 0.03.

The optimal sulfur content is more suitable as an anode material ifickelpellets range from $ 0.012 to $ 0.014, so the volume ratio of nickel carbonyl to carbon oxysulphide introduced into the decomposition chamber at 4540 s 1 biB 3780: 1 should be.

In the known moon process, the Hickel carbonyl by the reaction of carbon monoxide with a nickel stone or another nickel-containing material, with the carbon monoxide usually between a / volatilization tower and a decomposition chamber. The usage of carbon oxysulphide thus has the advantage that the carbon monoxide resulting from its decomposition is dissipated mixed with the carbon monoxide obtained during the decomposition of nickel carbonyl and the volatilization tower again can be supplied so that there is no contamination of the circulating carbon monoxide.

In a particularly preferred variant of the moon method the skin t3 migrate in the countercurrent to form a mixture Nickel carbonyl and carbon monoxide through a zero decomposition chamber and are fed back into the decomposition chamber via a preheater, in which they give off their V / arms. Included »The pellets are generally pre-loaded by means of a conveyor from the bottom of the etching chamber to the upper part of the

^009837/0269 l -

Preheater fed. This procedure is in the 'UK U.S. Patent 620,287. In the following embodiment of the invention, the pellets produced in the wines described above.

The gas mixture contained 8.4 vol .- # Ni (CO) ,, which corresponds to a Nikkei equivalent of 210 g / nr, and was conveyed through the system in an amount of 90 nr / h. The carbon oxyulfide was fed into the fresh gas stream in an amount of 2 l / h. The temperature of the nickel pellets in the Zersetzungekammer was 200 ⁰ C _β Within 24 hours, 454 kg of nickel pellets were prepared with a sulfur content of 0.014 $.

In the process according to the invention, other sulfur-containing gases, for example hydrogen sulfide, be used to introduce the sulfur into the nickel pellets formed in the decomposition chamber; other gases however, do not have the advantages of using carbon oxyulfide . Surprisingly, are sohweed dioxide and carbon disulfide relatively ineffective.

An advantage of using carbon oxysulphide as opposed to other sulphurous gases such as Hydrogen sulphide is found in the main carbon monoxide circuit between the volatilization tower and the cannon of decomposition only a comparatively small one Cleaning is required to maintain a high concentration of carbon monoxide maintain while in the decomposition of hydrogen sulfide or other sulfur gases Decomposition products are incurred, which - of course, together with a certain amount of carbon monoxide - removed from the circuit Need to become.

The main advantage of introducing the sulfur into the nickel pellets according to the method according to the invention

009837/0269

lies in the homogeneous distribution of the sulfur, which results in a corresponding reduction in the amount of anode steel when the pellets are used as anodes in the Galranic Absoheiden. This advantage can be seen clearly when comparing the amount of Anode sludge when dissolving boiled sulphurous Anode material · during the electrolysis under constant conditions.

Anodic material Anodensohlaaa

overall more metallic

proportion of

larbonylniekel pellets with 0.013 £ S, made using τοη carbon oxysulfide i.d. Decomposition chamber

0.17

0.0005

larbonylniekel pellets with 0.009Jl S, produced under Use τοη hydrogen sulfide i.d.Kersetsungs- chamber

0.39

0.34

larbonylniekel pellets with 0.018jt S, manufactured under Use τοη hydrogen sulfide in the decomposition chamber

0.27

0.10

Electrolyte handle with traces of sulfur

0.59

0.44

009837/0269

Claims (3)

Claims t Process for making sulfur-containing carbonylniekel pellets by thermal decomposition of nickel carbonyi, characterized by the simultaneous decomposition of carbonyl carbonyl and carbon oxysulfide in a decomposition chamber. 2. The method according to claim 1, characterized in that that the volume ratio of the nickel carbonyl and the carbon oxysulfite, that is, in a decomposition chamber mixed gas introduced 4540: 1 to 3780: 1 amounts to. 3. Use of the nickel pellets produced by the process of claims 1 and 2 as anode material in the galvanic process Deposition of nickel. ... u ,, - _d _ .. ...; ._.... ...... 3 desAndemteea & s. ν. 009837/0289 ORIGINAL iUcrwo ^ u