which may be employed in accordance with this invention are air steam nitrogen or other inert gasses and hydrocarbon gasses such as methane as long as the gas does not interact with the process among the available strippers i prefer the employment of the packed column type rather than trayed venturi or other type strippers although these may be used the packed column offers good efficiency and may be constructed of corrosion resistant materials economically the same comments apply to the water scrubber column for example among the scrubbers that may be employed i prefer the packed column type although trayed venturi or other types may be used accordingly my invention allows for choosing the most efficient and economic combination of such equipment various type of concentrators may be used the preferred embodiment uses mvr evaporators such as illustrated in the el tech and solution mining publications referred to in the detailed description of figures which are typical of current industrial practice operation below ph 2 offers no benefit because too much acid is used and too much caustic is then required to neutralize the acid following stripping furthermore conversion of the required carbonate species occurs in the ph range of 2 to 4 operation above ph 4 does not result in sufficient carbonate conversion to strippable carbon dioxide although the installation i have described employs a pipeline type acidification reactor and neutralization reactor which is the most economic choice other types such as stirred tank reactors or packed column reactors may be employed further although i have employed concentrated aqueous hydrochloric acid as the.