在装有炉料的坩埚中熔样通常是火法试金的开端,炉料是由研得很细的矿石、熔剂和其它材料组成。尽管其它处理原始样品的方法,如渣化法,熔烧法或酸浸法也可能是火试金的开端,但是也还要包括坩埚熔样。试金坩埚通常是由耐火粘土制成的,耐火粘土是或多或少地带有游离硅和重金属氧化物的氧化铝。氧化铝难于造渣,相对于含 In furnaces loaded with crucible melting is usually the beginning of fire test gold, the charge is made of very fine ore, flux and other materials. Other methods of handling the original sample, such as the slag method, the melting method, or the acid leaching method may also be the beginning of a fire test, but crucible smelting should also be included. The gold crucibles are usually made of refractory clay, which is alumina with more or less free silicon and heavy metal oxides. Alumina is difficult to slag, relative to the containing