JAM Group Co. is one of the most prominent manufacturers and exporters of Sodium Sulphide Flake 60% (Na2S) and Sodium Hydrosulfide (NaHS) in the Middle East. These products are used in many industries such as Leather Tanning, Mineral Processing (Flotation process) and so on.
Sodium sulfide is the chemical compound whose formula is Na2S and its hydrate which is more common is Na2S·9H2O. This is a colorless solid even if it is anhydrous or hydrated salt. They can be solvated in water and give you strongly alkaline solutions.
If sodium sulfide solids in both states expose to moist air, it would smell like rotten eggs due to the fact that it emits hydrogen solid.
Na2S•xH2O is the commercial samples, and the weight percentage of Na2S is specified. The 60% Na2S is a grade of the weight percentage that is more commonly available; it would tell you that the x is around 3. In this technical grade of sodium sulfide, the color is yellow due to the presence of polysulfides. Ranging in these grades of sodium sulfide, they are marked as sodium sulfide flakes.
There is no commercial process to produce the sodium sulfide that contains neither water nor iron. The available sodium sulfide is producing by reduction of sodium sulfide using carbon and also hydrogen and other reducing gases. A crude melt is yielded by reducing with carbon that contains amounts of impurities in addition to sodium sulfide. The impurities include ash constituents, unreacted carbon impurities from the carbon, carbonates, sulfites, sodium thiosulfates, and iron compounds.
The water-soluble part of the impurities and considerable amounts of iron pass into the extraction liquor by extracting the crude melt by water. There would be some undesirable products because other reactions would take place subsequently in aqueous solution. The crystals of the compositions Na S.9H O are obtained by evaporating the extraction liquor by further evaporation of the melt the 60% of Na S solidifies would be produced. The hydrate crystallizing from the solution and containing 32% of Na S both are containing amounts of soda, sulfite, thiosulfate, sulfate and iron salts.
Reducing the residual 40% of water content is not technically or also economically by further evaporation on account of the extraordinarily steep rise in the melt temperature above 60% of Na-S and there is no known suitable material which is resistant to concentrated sodium sulfite melt. Even the use of apparatus which made from expensive special alloys or causes heavy wear on other materials is needed for evaporation to only 60% of Na S.
A process has been discovered to obtain sodium sulfide which is free of iron and water with an excellent purity. In this process anhydrous sodium sulfide, unlike the hydrate, dissolves readily in alcohols.
In a process for the production of pure anhydrous sodium sulfide which is free from iron, the melt heating step that includes the reduced sodium sulfide with carbon and impurities resulting from the reduction process, with an alcohol, to filter the sodium sulfide solution thereby formed and recovering the sodium sulfide from the said solution by evaporating the alcohol.
Sodium hydroxide could have a reaction with H2S for forming the Na2S which that be treated with further H2S to convert Na2s to NaHS. It is proposed to gas Na2S-NaHS liquor with pure hydrogen sulfide to obtain sodium hydrosulfide.
The uses of Sodium Sulphide:
it is used in paper industry in the Kraft process. In water treatment it is used as an oxygen scavenger agent and metal precipitant. You can also use sodium sulfide for toning black and white photographs. For bleaching agent in the textile industry. To desulfurize and for dechlorinating. To sulfurize the tanning extract in leather trade and also during leather processing it is used in the liming operation as an unhairing. To produce the chemical component such as sulfur dyes and rubber chemicals, sodium sulfide can be used. Some other applications are oil recovery, ore flotation, making dyes and detergent.