DE761342C - Process for the production of strontium chloride from mixtures with barium chloride - Google Patents

Description

Process for the production of strontium chloride from mixtures with barium chloride According to a known method, a solution of chlorides is used for deposition brought mixture of barium and strontium chloride for the purpose of obtaining the individual salts treated in such a way that a cold saturated solution is prepared from the mixture and these with not much more than twice the volume of hydrochloric acid of about z, r spec. Weight or correspondingly less concentrated acid added. This is supposed to the barium chloride is almost completely precipitated, while the strontium chloride Remains completely in solution and from this through larger amounts of hydrochloric acid for separation is brought. This process is used to separate the barium and strontium chloride requires significant amounts of fluid.

In industry, especially when processing strontium-containing Barium minerals to barium chloride, are mostly solutions that contain a lot of barium chloride contain smaller amounts of strontium chloride. From such solutions one can initially the barium chloride by fractional evaporation in a practically strontium-free form to win. The strontium chloride remains dissolved in the resulting mother liquors and is enriched in it when the mother liquors are guided round. To The present process succeeds in a particularly simple manner in those on strontium chloride to recycle enriched barium chloride mother liquors economically and from them to obtain a practically barium-free strontium chloride. 112n proceeds as follows The mother liquors obtained in the production of barium chloride are expediently used so long -round guided until BaC12, 2H, 0 and SrCL, 6H .., 0 in approximately the same concentration are present. Such alkalis are either evaporated to dryness or those dissolved in them Salts precipitated by saturation with hydrochloric acid gas.

Such salt mixtures, in which barium and strontium chloride are present with one another as solid salts, are treated with an alkali which is as saturated as possible in both salts at room temperature and contains about Soo g Sr CL, 6H20 and 13.9 g Ba CL, 2H20 per liter . By heating with this lye, only the strontium chloride is released from the solid salt mixture.

The amount of lye and the dissolving temperature are to be matched to one another in such a way that by dissolving the strontium chloride contained in the salt mixture one at the The chosen solution temperature is saturated solution.

The triggering takes place preferably at temperatures up to 6o'C. At higher temperatures, the warm, saturated solution separates out on cooling so much salt that it is difficult to separate the crystallizate from the lye.

After separation from the undissolved barium chloride, the warm solution cooled to room temperature. The absorbed crystallizes Strontium chloride as a practically barium-free salt. The mother liquor is again used to trigger strontium chloride.

Since both barium and strontium chloride with increasing temperature have an increasing solubility, it was to be expected that when triggered in heat barium chloride would also be dissolved and, accordingly, salt mixtures on cooling would crystallize out.

The investigation showed, however, that when BaCI_SrC12 salt mixtures are heated with an alkali which was saturated in both salts at room temperature, only strontium chloride is triggered as long as both salts are present as sediment. When cooling down the warm, saturated solution separates a barium-free strontium chloride.

The present method is particularly suitable for utilization the strontium content of strontium-containing barium minerals through their transfer in chlorides in a manner known per se and further treatment of the mixtures according to Invention. Embodiments i. A solid salt mixture with goo g BaCl2, 2H20 and 100 g of SrC12.6H20 was treated with 1.61 of an alkali which at room temperature on BaC12 and SrCl2 was saturated (8oo g / 1 SrCl2, 6H20, 13.9 9l BaCl2, 2H20), stirred and warmed to 5o'C.

After the barium chloride which remained undissolved had been separated off warm solution cooled to room temperature. The absorbed crystallized Strontium chloride and was separated from the mother liquor.

The strontium chloride crystals were covered with about 1 cc of water and air dried. 1025 g of SrCl2.6H20 were obtained, their content of barium chloride below o, i 0. ", was.

2. 2o kg barite with 92.50 /, Ba S04 and 3.5 °; o Sr S Oi content was processed in four parts of 5 kg each via sulfide and carbonate to form barium chloride, with about 12.81 saturated BaC12 lye with 4.75 kg BaCl ,, 2H20 and 0.25 kg SrC12.6H20 being formed .

The BaC12 liquors were evaporated one after the other. The mother liquor was combined with the BaC12 liquor to be subsequently evaporated. The following amounts were obtained f Ba Cl " : 2 H = O solid mother liquor Evaporation the i. Lye 2.95 kg 5.1 1 with 0.25 kg SrCL, 6H20 and 1.80 kg BaCI ,, 2 11.0 - 2- - 4.95 kg 5, o 1 - o, 5o kg - - - i, 6o kg - - - 3. _ 5, o5 kg 4.71 - 0.75 kg - - - 1.30 kg - _ - 4. - 5, io kg 4.31 - i, oo kg - - - o.95 kg - - Both salts were obtained as a solid salt mixture from the mother liquor obtained last by evaporation or saturation with HCl gas (g95 g of Sr chloride and 947 g of Ba chloride).

The salt mixture was with 1.451 of an alkali which was at room temperature of BaCl, and SrCl2 was saturated (8oo g / 1 SrCl, 6H20, 13.9 gjl BaCl2, 2H20), stirred and heated to 50 ° C.

The warm solution was separated from the Ba chloride which had remained undissolved and cooled to room temperature. The absorbed strontium chloride crystallized and was filtered off. After covering the strontium chloride crystals With about 100 cc of water, 9z9 g of SrCl2.6H20 were obtained, the content of which was barium chloride was below o, i ° / o.

Claims (2)

PATENT CLAIMS: i. Process for the production of practically barium-free Strontium chloride from mixtures with barium chloride, characterized in that one the mixtures in the heat with at room temperature of barium chloride and strontium chloride Treated saturated alkalis, the solutions obtained from the undissolved barium chloride separated and strontium chloride separated from the liquors by cooling. 2. Procedure according to claim i, characterized in that such mixtures are used as starting mixtures of barium chloride and strontium chloride used, which by transferring strontium Barium minerals can be obtained in chlorides. To delimit the subject matter of the invention from the state of the art, the following publication is to be considered in the granting procedure ' drawn: German Patent No. 23 372.