IL44867A - Extraction of metals - Google Patents

Description

SXTWAOTIOH m A process for tho extraction of gold and aoid solutions containing t together other and for tho separation of comprises ing tho aoid solution of tho metals a ion of a selected tho group of aliphatic of C to and acid to in the aoid to in tho in a substantially solven separating tho organic tho phaeo tho doisirod metal from tho organic Preferred oaptans are dodecyl mercaptoacetato and Tho present invention to a novel process for the of certain such as mercury and gold from aoid ticularlyo tho invention rolatoa to a novel procoos for tho concentration and purification of from cortain and dump According to tho present invention it is possible to enrich certain as will be set out and is also possiblee due to the epeoifioity of the extraction agents to such or one of in a substantially pure other metals contained in the starting Other and further features of the present invention become apparent OF In tho conventional process for the production of the ore is to a quence of process steps comprising a conversion a thermal and smelting of tho The of by solvent comprises fewer namely electrolysis and It is a considerable back of the extraction process that the product la not always obtained in and times tho product must subjected to a further or that product can used only for certain and thus only at The extraction process ia of advantage where there starting materials which such as from liquors of other copper from ores ia contained in admixture many other motals or with quantities of or in the recovery of from or ores whore tho copper content is rather Solvent extraction ia generally as a step for concentrating dilute or for purification of are various liquid ion products of General Mills used for extraction of acidic dump loach liquors in appearing in Invention relates to a process for extraction of gold and from acid solutions containing other and tho of prises the acid aqueous solution of the with a solution of selected tho group of aliphatic to me tans of to and mercapto aoid esters to in tho acid moioty9 to ia the in a substantially separating tho organic from the aqueous phase and recovering tho metal from the Preferred are to the novo process of tho present inventio the separation of the desired metals from as is a substantially quantitative one and no further steps of puri from According to the present there provided a process for the recovery of certain and especially of end by solvent in tho from aqueous o organic comprises the sired metal or by moans of a solution of a Preferred compounds for of metal values according to iho present invention silverp and are mercaptans selected tho consisting of aliphatic mereap 6 to 22 carbon 1 to 22 c atoms t o and acid 1 to 3 carbon atoms tho acid and of 6 to carbon atoms in the compounds suitable for the process of invention s Esters of of tho of acid R a of 6 to carbon of 6 to carbon atoms or of tho formula or nates of 6 to 12 carbon atoms j R a straight or branched chain of 6 to 22 carbon say men as and such as and such as alcohols e auch as trio All of readily soluble in aro soluble in soluble in polar compounds as agen s in process of the present invention ax e Dodec Oc aoid hexa glycol Moat of above aro widely used as polymerisation modifiora as As solvent suitable which is cyoloaliphatio as the complex It of the advantages of the process that may bo effectively carried out at a low and at a lower than In analytical chemistry extractions and tations mercaptoacetic are off those not and of or can bo for the extraction solvent extraction to their specificity and invention is described by way of illustration only with to the following which to construed in a 1 aqueous leach liquor oont cuprous chloride at a concentration 1 g coppor por of pH a solution of 4 in 50 ml kerosene at room shaken for and stripped after this period of time ml of a of 1 volume acid and 1 volume An extraction of of the coppor obtained in tho raction being and respectively in and the copper was thus obtained in puro form as solution in the aqueous 2 A carried out in X9 but with loach liquor of The extraction in one Example 3 A run was carried out exactly in but with a leach liquor of pH An extraction of nearly was obtained in Example 4 A leach liquor containing 1 g copper ions the cuprous and 10 g iron ions per liter of aqueous solution was treated in exactly the same manner and under the conditions as in Example eamo results obtained as regards the extraction of the coppe and no traces of iron of Examples 2 and also repeated and the same extraction of with no extraction of was Example 5 3 Runs carried out as in Examples 2 and but with a liquor containing 1 g copper 10 g iron ions and 5 of manganese pe liter of aqueous The extraction of was the and no iron or was Example 6 fl Δ run was carried out as set out in Example 19 but the solution for extraction vras one of 4 g deoylmorcaptoacetate i ml of Identical results as xample 1 wore Example A loach liquor containing 5 g ions of copper per liter of aqueous solution of pH with a quantity of ml keroaene containing 4 g After for 5 the solution stripped as 1 and after 4 an extraction of of tho coppor was After only o minute tho extraction was The run was repeated at pH and 4 was At the extraction in 4 At pH with shaking of 1 minute in 4 the extraction was The leach liquors taining ions of ferric and s and and none of these wore Example 8 A run carried out as in Example but with a solution of coppor sulfate of 1 g copper ions per extraction was effected 20 ml kerosene containing 10 g In 4 stages of 5 minutes shaking oac following extractions obtained at pH a total of at pH a total of at pH a total of An solution of pH containing 1 silver ions silve was extracted with a olution of 5 g o in 20 ml After 5 minutes the extraction s A solution of containing 1 g mercury ione liter wao extracted in Example After 5 minutes the extraction wao Example 11 A solution of pH containing 1 g aurate ione was extracted in Example After minutes the extraction nearly Example 12 s of copper and A loach liquor of pH containing ione and 100 rag ions per 100 ml wao 100 ml of the solution extracted by means of 30 ml kerosene containing 1 g After shaking the extraction in 1 stage 100 and 220 mg Example 13 s A quantity of 100 ml of a solution of mg and 10 mg Ag was pH and in one stage and there were extracted 10 mg Ag and 8 Cu Example 14 8 A solution containing per 100 ml a quantity of 2 and 100 mg ions extracted a a pH of with 20 ml kerosene containing 1 g After shaking 3 minutes in 1 stage an extraction of of the ions and no extraction of the ions was It is that this extraction agent is specific for cuprous A solution containing per a quantity of 1 g and 100 iona extracted at a pH of 20 ml containing 1 Q After for 5 one about 100 of the iona wore Ho Cu were at An aqueous solution of pH containing 100 mg ions and 1 g ions in 100 ml was extracted as in Hg ions extracted completely from the Ho Cu were insufficientOCRQuality

Claims (1)

1. CLAIMS A for extraction of and mercury acid solutions containing those together and for tho separation of which comprises contacting the acid aqueous solution of the metals a solution of a selected from tho group of aliphatic mercaptans to ca ans of to and mercapto acid to in acid to in the in a substantially separating the organic from tho aqueous phase and recoverin tho desired metal from tho organic A process according to Claim wherein the captan is an of the formula where designates a or branched of 6 to 22 carbon atoms A process according to Claim wherein captan is an mercaptan of 1 to 22 carbon atoms in tho alkyl A process as claimed in Claim t o captan an acid ester of 1 to carbon atoms in the acid moiety and 6 to carbon atoms in the esterified A process according to Claim the ester is derived from mercaptoacetic acid or propionlc A process as claimed ia Claim wherein ester is an estor of a polyhyd alcohol with acetic acid or with of oil refining A process according to Claim wherein captan is A process according to Claim 2 where the solution contains cuprous copper and and whore the copper is selectively extracted by A process according to claim 4 for the tion of silver or its enrichment froa solutions containing both copper and wherein the tracting agent is dodecylmercaptoacetate insufficientOCRQuality