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United States Patent Office Patented Nov 2,724,635 United States Patent Office Patented Nov. 22, 1955 1 2 completed, the solution is diluted and the insolubles such as silicates, etc., are removed by settling, decantation, 2,724,635 filtration, and the like. To the combined titanium iron PRODUCTION OF AN ALKALI METAL DOUBLE sulfate solution there is then admixed the alkali metal FLUORDE OF TTANIUM fluoride as from the afore-mentioned decomposition of Eugene Wainer, Cleveland Heights, Ohio, assignor, by double fluoride of titanium and alkali metal. Thus, where mesne assignments, to Horizons Titanium Corporatio), the decomposition has been in an electrolytic Zone, the Princeton, N.J., a corporation of New Jersey alkali fluoride remaining from the electrolysis is recycled to the zone reacting titanium compound with alkali metal No Drawing. Application February 4, 1952, 10 fluoride in the first instance. Usually, an electrolytic ; Serial No. 269,695 bath based on double fluoride of titanium, together with 5 Claims. (CI. 23-88) a molten bath constituent of halide, a chloride of alkali or alkaline earth metal (i. e., K, Na, Li, Sr, Ba, or mixtures, and preferably sodium chloride), after the In the production and use of compounds of titanium, electrolysis consists of potassium fluoride and sodium and particularly the fluoride compounds, a serious disad vantage heretofore has been the high cost of product by fluoride. Thus, with a bath in the first instance of potas reason of the expensive nature of the materials and pro ponentsium titanium subjected fluoride to electrolysis, and a sodium the decompositionchloride bath commay cedures which have been used. I have now found that be generally represented by the following equation: much of the high cost factor can be eliminated, and a 20. compactly workable process may be had, with elimina 1. tion of losses heretofore serious. Other objects and ad electrolysis vantages will appear from the following description. KTiF6 + 4NaCl Ti + 2Cl2 + 4NaF + 2KF To the accomplishment of the foregoing and related Hustratively also, the reaction of sulfuric acid on the ends, said invention then comprises the features herein ilmenite as above-mentioned may be represented by the after fully described and particularly pointed out in the following equation: claims, the following description setting forth in detail 2. Fe0.TiO2-3H2SO4->Ti(SO4)2--FeSO4+3H2O certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various The combined titanium iron sulfate solution is treated ways in which the principle of the invention may be with the constituents remaining from the decomposition employed. ... or electrolysis, viz., the alkali metal fluorides. Usually In general, the invention involves cycling the alkali these will include sodium chloride which has not been metal component for compound fluorides of titanium decomposed, and the amount will vary depending on the through zones reacting alkali metal fluoride with a completeness of the reaction which has been provided in titanium compound to formation of double fluoride, and Equation 1. I have found, surprisingly, that the presence a zone decomposing such double fluoride to titanium metal of sodium chloride in varying amounts does not interfere and alkali-fluoride, and then to Such first reaction Zone with the quantitative recovery of potassium titanium to form double fluoride. Thus, by-product alkali fluoride fluoride. The reacting then of the bath by-product otherwise left by decomposing a double fluoride of fluoride with the afore-mentioned titanium sulfate as from titanium is recycled to the reaction Zone forming double 40 Equation 2 illustratively, may be shown in general by the fluoride. following equation: . The titanium compounds as raw material for prepara tion of titanium double fluoride are such raw materials as In the presence of varying amounts of sodium chloride, ilmenite and other ores of titanium, more or less purified somewhat better results are obtained if roughly two-thirds oxide of titanium, meta-titanic acids, slags containing high of the total fluorine requirement to make double fluoride, percentages of titanium dioxide, titanium sulfates, and the in the form of the mixed potassium sodium fluoride salts like. For the alkali metal fluoride component, it will be is first added to the titanium sulfate solution in dissolved understood that this comprises metals of the alkali group, form, and then if any precipitate occurs it is removed by potassium and sodium being preferred, and the term filtration. The reaction of the sulfuric acid on the "alkali fluoride', concisely designates all these herein ilmenite in the first instance, involves raised temperature, after. and to the clear hot liquor, after filtration, the remaining The double fluoride of titanium and alkali metal is fluoride requirement is added. Reaction occurs, and then subjected to decomposition in a decomposing zone to the solution is evaporated down until crystals appear, and form titanium metal, and the alkali fluoride is a by potassium titanium fluoride thus separates out. This product. While the decomposition of the double fluoride 55 potassium titanium fluoride is then re-dissolved and re may be carried out by heat reaction, electrolysis is here crystallized, and made up for electrolysis with further more generally involved and in presence of chlorine, and sodium chloride, and is again subjected to decomposition. as the details are not a part of the present invention, it Chlorine is evolved, but fluorine is not. Thus, the proc is here sufficient to state that the compound fluoride of ess is completely cyclical, and the only losses are the titanium and alkali metal as afore-mentioned, is decom 60 minor losses normally encountered in properly controlled posed to metallic titanium and fluorides such as of potas chemical operation. Costly fluorine is conserved and sium and sodium. It is such latter material that is then cycled through the respective reaction zones. recycled to the formation of double fluoride of titanium Instead of operating batch-wise in decomposition for and alkali metal. electrolysis of the double fluoride of titanium and alkali With a raw material such as ilmenite, a desirable pro 65 metal, in some cases a continuous type of operation may cedure is to reduce the iron content to the ferrous state, be applied, removing molten bath material from the re either by heating in the presence of carbon (finely di action zone as the process proceeds, this being possible vided, or a reducing gas or reducing furnace atmosphere) by reason of the fact that the titanium metal formed is or by addition of scrap iron and sulfuric acid. If the segregated at the cathode. amount of the sulfuric acid is sufficient to react with all Illustratively, then, with ilmenite as the starting material, of the constituents of the ilmenite, there results titanium the only raw materials which are consumed in the op sulfate and iron sulfate solution. After such reaction is eration are ilmenite, sulfuric acid, and the sodium chlo 2,724,685 3 4. ride or alkali metal halide bath component, and the en aqueous solution reacting the aqueous solution so obtained tire operation may be summarized illustratively by the fol with a source of fluoride ions and of alkali metal ions con lowing equation: sisting essentially of the spent salt bath resulting from the electrolytic decomposition of an alkali metal fluo 4. Feo.TiO2-4-3H2SO4-1-4NaCl-) . titanate in a fused alkali metal halide bath, and crystal Ti-2Na2SO4--FeSO4--2Cl2-3H2O lizing from said resultant solution, the alkali metal fluo In similar manner, other raw materials than ilmenite, titanate formed therein. and other alkali metal bath halide components apply in 3. The method of producing potassium fluotitanate the same general way. which comprises digesting an oxidic ore of titanium in sul As an example: Ilmenite, finely ground, is reacted upon 10 furic acid to produce a solution containing titanium ions, with sulfuric acid solution in amount to substantially com separating any insoluble phase from the solution produced, pletely dissolve it. Any insolubles are eliminated. The reacting the solution with a source of fluoride ions and po reaction involves raised temperature, and to the clear hot tassium ions consisting esentially of the spent salt bath solution, there is then added alkali metal fluorides, KF resulting from the electrolytic decomposition of potassium and NaF from the electrolysis of potassium titanium fluo 5 fluotitanate in a fused alkali metal halide bath and re ride, in proportions of one mole of titanium sulfate and 2 covering potassium fluotitanate from the resulting solu ... moles of potassium fluoride and 4 moles of sodium fluo tion by crystallization. ride, with slight excess. The solution is then evaporated 4. The method of producing potassium fluotitanate from until crystals begin to appear, and then on cooling, the ilmenite which comprises reducing the iron content of the potassium titanium fluoride separates out, and is removed 20 ilmenite to ferrous iron, digesting the resulting material by filtration. It is then re-dissolved and re-crystallized, in sulfuric acid to produce an aqueous solution containing and mixed with sodium chloride in about the proportions titanium ions, separating insoluble materials therefrom, of one mole of potassium titanium fluoride and 4 of sodium reacting the remaining aqueous solution with a source of chloride, and subjected to electrolysis. Sodium chloride fluorine ions and potassium ions consisting essentially is particularly desirable, from the standpoint of simplicity, 25 of the spent salt bath resulting from the electrolytic de such bath, melting at around 700 C., electrolyzed in an composition of potassium fluotitanate in a fused alkali atmosphere free from oxygen, at a voltage for instance metal halide bath and recovering potassium fluotitanate 0.5-3 at first, and not exceeding 100 amp. per sq. dec. from the resulting solution by crystallization therefrom. And later with voltage increased to 5-8, and current 5.
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