The boron-rich slag is similar to ascharite in the chemical composition,which can replace the ascharite as the source of boron and magnesium.The sulfuric acid one-step method was determined for the preparation of boric acid and magnesium,and the carbonate-alkaline method for borax.The both results are very good.The recovery of boric acid,magnesium sulfate monohydrate and borax is 71.86%,55.77%and 71.93%respectively,which fits national quality standards because of their high purity.Compared to the two method...