Abstract: A leather tanning agent characterized in that it contains the following components, percent by weight:______________________________________ sulphate of aluminum and ammonium 3 to 20 containing 0.001 to 1.0% of TiO.sub.2 or TiO.sub.2 and ZrO.sub.2 and/or sulphate of zirconium and ammonium 20 to 50 containing 0.001 to 0.5% of TiO.sub.2 or TiO.sub.2 and Al.sub.2 O.sub.3 and sulphate of titanyl and ammonium containing of 0.001 to 1.0% of Al.sub.2 O.sub.3 and/or ZrO.sub.2 the balance. ______________________________________The above-mentioned additives of TiO.sub.2, ZrO.sub.2 and Al.sub.2 O.sub.3 incorporated in the sulphates are present therein in a chemically combined state.

Abstract: The present invention relates to methods for preparing a titanium tanning agent from sulphuric-acid titanium-ferriferous solutions and use thereof for leather tanning.The method for preparing a titanium tanning agent from titanium-ferriferous sulphate solutions comprises introduction, into said solution, of an oxidizing agent comprising a sulphuric-acid solution of a peroxy-titanium complex, follows by the addition of ammonium sulphate and sulphuric acid to precipitate a double salt of titanyl and ammonium sulphate in the monohydrate form (NH.sub.4).sub.2 TiO(SO.sub.4).sub.2.H.sub.2 O. The precipitation of this salt is preferably effected prior to its formation in an amount of 75-85% based on TiO.sub.2. The resulting salt is separated and washed; the filtrate and washings are combined and treated with ammonium sulphate to after precipitate the salt which is separated and recycled into the starting solution.

Abstract: The present invention relates to methods for preparing a titanium tanning agent from sulphuric-acid titanium-ferriferous solutions and use thereof for leather tanning.The method for preparing a titanium tanning agent from titanium-ferriferous sulphate solutions comprises introduction, into said solution, of an oxidizing agent comprising a sulphuric-acid solution of a peroxy-titanium complex, follows by the addition of ammonium sulphate and sulphuric acid to precipitate a double salt of titanyl and ammonium sulphate in the monohydrate form (NH.sub.4).sub.2 TiO(SO.sub.4).sub.2.H.sub.2 O. The precipitation of this salt is preferably effected prior to its formation in an amount of 75-85% based on TiO.sub.2. The resulting salt is separated and washed; the filtrate and washings are combined and treated with ammonium sulphate to afterprecipitate the salt which is separated and recycled into the starting solution.