Patent GB-190509017-A (GB)
Title: Processes for the Preparation of Antimonial Substances used for Painting and other purposes and the Products thereof.
Inventor: CHATILLON EMMANUEL
Filed: 1905-04-28
Granted: 1906-04-26
Abstract: 9017. Chatillon, E. April 28. Pigments.-Relates to the preparation for use as pigments of antimony oxide intimately mixed with small amounts of other salts or oxides, and of antimony sulphides mixed with similar salts &c. with or without antimony oxide. In the preparation of antimony white, a cupola furnace is charged with alternate layers of ore and fuel and lighted, and by means of ventilating-fans water containing alkalineearth salts or hydrates is injected. These substances react with the furnace gases, and the resulting.compounds are precipitated together with the antimony oxide. Thus, if barium hydrate is injected, the following mixtures may be obtained: (1) antimony oxide and barium sulphite; (2) antimony oxide and barium carbonate and sulphate ; (3) antimony oxide and barium carbonate, hydrate, and sulphate. Similarly the hydrates 'or carbonates of calcium, aluminium, magnesium, &c. may be used. Orange antimony is similarly obtained from a cupola furnace, at the exit of which is a chamber into which water or water vapour is injected the gases pass from here into another cupola-shaped chamber containing coke this in presence of the water reduces sulphur dioxide to sulphuretted hydrogen, which forms antimony sulphide with the oxide, this latter reaction being assisted by a second injection of water in a small chamber connected directly to the last. In: this case also, sulphides, carbonates, sulphites, or hydrates are injected in the water. Pyrites, blende, or other sulphur ores may be added to the antimony ore or in the first or second cupola or into a third independent furnace, if necessary. Admission of a regulated supply of air results in the formation of a mixture of oxide and sulphide (antimony vermilion). The orange sulphide may also be prepared by beating the ore in a closed vessel, drawing the vapours through an inert gas (water vapour, nitrogen, carbon monoxide, &c.),and suddenly condensing them by the ventilators injected with water, and the vermilion also may be obtained thus by admission of air with the water vapour. Distillation of the ore at a redheat and rapid condensation gives a violet product. The following alternative processesmay be employed also:-For antimony white or antimony minium, the ore may be fused with alkalineearth oxides, hydrates, or carbonates ; the antimonites thus obtained are precipitated with the sulphur dioxide by means of the ventilators injected if desired with water containing substances as described, or by means of towers up which the gases pass, while water flows downwards. For the yellows and vermilions, the ore may be heated with a large excess of coke, while the whole is sprinkled with water, or water vapour is drawn through, ventilators and condensing-chamber &c. being used as before ; or barium sulphate, antimony sulphide, and sodium carbonate with or without charcoal are fused together, and an orange mixture of antimony sulphide and barium sulphite is obtained by precipitation by the furnace fumes. Or the fused substances may be run into water to dissolve out soluble salts and the insoluble salts suspended in water are injected in ventilators which are used for condensing antimony oxide; other alkaline-earth salts may replace the barium. Or for making yellows, barium, or other alkaline-earth sulphides dissolved in water may be injected in the ventilators or towers of the furnace in which the ore is treated. The production of oxide and of yellow, red, or other colour may be combined, the sulphur dioxide from one furnace being used for injecting salts into the other ; or the gases may be passed through coke and then act upon antimony oxide on a hearth or a revolving cylinder. To aid condensation, the gases may be used to heat a boiler which supplies the necessary steam.