1. Ko te tikanga whakaheke waro, ka konatunatuahia te mirabilite me te waro purakau ki te tauwehenga o te 100: (21-22.5) (te tauwehenga taumaha) me te calcined me te whakaheke i te teitei teitei o te 800-1100 °C, a ka whakamataohia te hua ka whakamataohia, ka werahia. ka rewa ki roto i te wai me te waimeha reito, i muri i te tu mo te whakamarama...
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