Method of treating copper-bearing substances. This process may, if necessary, be repeated several times. According to this publication, gelatinous precipitates of the copper hydroxide type are obtained, when the precipitation is carried out with dilute copper(II) chloride solutions and, according to the data presented there, basic crystalline copper(II) chloride is precipitated when concentrated copper(II) solutions are used. At the same time, the bulk density of the subsequently dried material is also increased by this so-called upgrading procedure. 4. %���� GOLDSCHMIDT AG, GOLDSCHMIDTSTRASSE 100, 4300 E, ASSIGNMENT OF ASSIGNORS INTEREST. Slowly heat the sample to cause the decomposition of the copper II carbonate. GOLDSCHMIDT AKTIENGESELLSCHAFT;REEL/FRAME:013774/0695, Process for the production of basic copper carbonate, Method for preparing catalyst precursor for methanol synthesis, Vitamin compatible micronutrient supplement, Material for copper electroplating, method for manufacturing same and copper electroplating method, Preparation and use of selenium-coated basic copper chloride, Method for preparation of iron-containing crystal basic copper chloride and use thereof, Method for recovering basic cupric carbonate from circuit board acid etching waste liquor, Process for working up hydrolysed residues arising in the preparation of organochlorosilanes. Process for the treatment of copper ores and the recovery of their values. Large amounts of waste solutions from copper etching processes are obtained in the production of etched moldings and printed circuits. x��[mo�8� ����b͊oz�R7m�h�n��^��v"'��%W����������>�� r$��33$�{���x��rt�E�! (a) Write a balanced equation for the reaction of basic copper carbonate to give copper oxide (CuO). 1 0 obj <>/Metadata 215 0 R/ViewerPreferences 216 0 R>> TOREN, MCGEADY & ASSOCIATES (NEW YORK, NY, US), Click for automatic bibliography III, 1946, pp. In a preferred version, the waste solution from the copper etching processes is stirred into an alkali carbonate solution that already contains basic copper carbonate in suspended form. The inventive process is described in greater detail by means of the following examples. Accordingly, finely to coarsely crystalline copper carbonate particles, ranging in size from 5 to 50 μm, depending on the number of precipitation processes, are formed. The vibrations of the carbonate … A light green, basic copper carbonate is obtained, which is free of copper chloride and copper oxide. Allow the test tube to cool completely. Here also, a sample (B) was taken from the precipitated sludge at the end of the reaction after the supernatant solution had been decanted off. stream A sample (A) was taken from the precipitated sludge, filtered, washed and dried. Mellor, Joseph William, A Comprehensive Treatise on Inorganic and Theoretical Chemistry, vol. <> This process was repeated an additional three times, and samples C, D, and E were taken after each precipitation process. 3. At the end of the reaction, a light green precipitate of basic copper carbonate is then present, which, after the supernatant aqueous solution is decanted off, can be readily and rapidly filtered off. The invention relates to a process for the preparation of basic copper carbonate by reacting copper salts with alkali carbonate in aqueous solution at elevated temperatures and with stirring and subsequently isolating the copper carbonate. This composition corresponds to the formula CuCO3. © 2004-2020 FreePatentsOnline.com. 423/35, 423/42, 423/429, 423/604, 423/DIG.1, 423/DIG.2, 423/35, 423/419R, 423/604, 423/DIG.1, 423/42, 423/DIG.2, 423/429, 75/117, 204/106. Title: CopperGlycine Author: hilljb Created Date: 10/1/2009 5:46:51 PM !��1�' ����r�:������%�'XSua���z�ͥ������ ��k!_!V[��.��2���%\_�*��샜�B������=��S��o _6�˸��A����qv������;\�T=�09����Ɩ %,c�7 ��] ��x�t��WP��.>\b8A�su�)L�f���5����M�4�Q�A�B�f�dÒxr�dƍ�[�C���fie ��%jz�L�+�y�����/�*E��$���$Ox��1?���˖��� ��kܞ�Y�}����Hq��][���œ7��4(? The purpose of this step of the process is to enlarge the precipitated, crystalline copper carbonate particles. Structure, properties, spectra, suppliers and links for: Copper(II) carbonate hydroxide, 12069-69-1, copper carbonate, basic. Abstract: Basic copper carbonate [Cu2(OH)2CO3]with sphere-like morphology had been prepared via a direct precipitation route by controlled reaction conditions. In this connection, it has proven to be particularly difficult to work up waste solutions from copper etching processes which contain hydrochloric acid. 2 0 obj Waste solution from copper etching processes is then again stirred into this suspension under the aforementioned conditions. You do NOT get the expected product "CuCO"_3, which is unstable in the presence of water. 3. 4 0 obj <> The properties of Samples B, C. D, and E may also be found in Table 1. In a second step, the reaction mixture is converted at temperatures of at least 60° C. into basic copper carbonate. The factors like reaction temperature and reaction pH were studied. A sodium carbonate solution (90 l) containing 146 g Na2 CO3 /l was added to a 200 l vessel equipped with stirrer and heated to a temperature of 60° C. While stirring intensively and maintaining this temperature, 44 l of a waste solution from copper etching processes with a density of 1.34 g/cc and containing 21 g/l of HCl, 183 g/l of NaCl and 272 g/l of CuCl2 were added at a steady rate over a period of one hour. During the addition, the pH which initially was higher than 12, came to a value of 7.7. However, the precipitation process was not terminated when the pH reached a value of 6.5, but instead continued until a pH of 5.0 was reached. Sodium carbonate solution was added once again to the remaining aqueous basic copper carbonate suspension and waste solution from copper etching processes was added as described above. It is essential that the pH does not fall below 6.5. 5. ;ASSIGNORS:GOTTFRIED, WERNER;MACK, ERNST;WITZKE, LOTHAR;REEL/FRAME:004399/0490, CHANGE OF NAME;ASSIGNOR:TH. We have discovered an economic and simple process for the utilization of the aforementioned waste solutions from copper etching processes by means of which a basic copper carbonate is obtained, which is as free as possible of copper oxide and copper chloride. The bulk of the deposited, basic copper carbonate was now filtered off, washed and dried. The invention relates to a process for the preparation of basic copper carbonate by reacting copper salts with alkali carbonate in aqueous solution at elevated temperatures and with stirring and subsequently isolating the copper carbonate. endobj 4. %PDF-1.7 Put your equipment together as in the diagram on page 1. In a second step, the reaction mixture is converted at temperatures of at least 60° C. into basic copper carbonate. �YG�lP0�QZ���C�R� 4I� ��x,�єG���2\�u�Ib&y�ľ��L��K�#��,uM����$��� ��X�5�}ww�ҡG�e[x+�ڊV��a��cC�|�*��*RH�]�34�;SR��k��j�a�v��#�o��*K��p���w�Cy�rEhX]Z��h���NI���5�H@��6Ҁc��(�v\�l٠�#u_�X�آ��hIm� o�^���j���>Q��s\c�匑QâfY�4��y`4xS6)M�7o`�&0b��~�Ţ$��5�4�6!7�zN��������0��E��� \7�f���4تDv��l�sx��W�~~]҈�D�t��}~�؟����x�7��o�ї�y?��E>%�m�H/�H� German Offenlegungsschrift No. Cu(OH)2. xH2 O, in which x is less than 0.5. Is copper carbonate soluble in ethanol? 267-280. The basic copper carbonate so obtained is particularly suitable as a feed additive and for the preparation of catalysts. Apart from the fact that very pure copper salt solutions are used in this process, the purpose of the process is to prepare a crystalline, bismuth-containing copper carbonate for use in the preparation of a copper(I) acetylide complex that can be used as an ethinylizing catalyst. It mentions, however, a process for the preparation of basic copper carbonate, in which hydrated copper carbonate is precipitated by simultaneously feeding in the copper salt solution and the neutralizing alkali carbonate while stirring and maintaining the pH between 5 and 8.