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By T E. Thorpe

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The Societe Industriale de Pont Saint Martin the crude sulphide, and carriage in this form and A. Piecinini (Zeitsch. angew. Chem. 1908, was stopped (J. Soc. Chem. Ind. 1896, 838). 782) prepare sodium sulphide in a kiln from coke The crude sulphide is now all lixiviated in vats and sulphate by heating the mixture in an elec- similar to those described under the Leblanc tric furnace. Another interesting proposition process for lixiviating Leblanc * blackash ' is that of Gossage, Matheson and Hawlicek (see Figs.

Efficiency of the pan, it becomes necessary alter working for a given time to run off all the liquid from the pan and remove the scale. is termed picking the pan. This opera- ' ' tion FIG. 19. Solar salt. In some places, where the natural brine is so Aveak or fuel is so scarce that evaporation by tive, salt is artificial heat made by exposing rays of the sun in large is not remunera- the brine to the wooden pans resting on the ground. Such pans are frequently provided with movable covers which are pushed aside in fine weather and drawn over if rain comes.

Of 1-65 and allowed to Chaussier. Small quantities of the salt may be cool, when sodium thiosulphate and a little made by taking about 1 Ib. of pure, well- sulphite crystallise out. The yield of thiosulphate can be greatly dried sodium carbonate, mixing with it about salt i | its weight of flowers of sulphur, and then heating the mixture in a porcelain basin to the melting-point of sulphur for some time, stirring well all the while, so as to bring every part in contact with the air. Oxygen is absorbed by the sodium sulphide formed, which is converted, with feeble incandescence, into sodium When cold, the mass is dissolved thiosulphate.

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