Method for producing sodium metaborate and sodium perborate from boronic concentrate

The invention discloses a method for producing sodium metaborate hydrate and sodium perborate hydrate from boronic concentrate. The method comprises the following steps: dissolving boronic concentrate powder by using a sodium hydroxide solution, and carrying out solid-liquid separation to obtain primary digestion liquor and wet boric sludge containing sodium metaborate; supplementing sodium hydroxide and washing water of all levels to the primary digestion liquor, then dissolving out fresh boronic concentrate powder, and carrying out solid-liquid separation to obtain secondary digestion liquor containing sodium metaborate; cooling and crystallizing the secondary digestion liquor to obtain sodium metaborate hydrate, and carrying out three-level countercurrent washing on primary and secondary wet boric sludge to obtain washing water and boric sludge; uniformly mixing the washing water and crystallization mother liquor through proper evaporation and concentration and returning to prepare a leaching agent; and carrying out reaction on dissolved sodium metaborate hydrate and hydrogen peroxide to prepare sodium perborate hydrate. The method disclosed by the invention can be used for efficiently extracting and separating boron in hardly treated boronic concentrate to prepare sodium metaborate hydrate and sodium perborate hydrate so as to effectively recover sodium oxide and boric oxide in wet boric sludge, so that the recovery utilization rate of resources is improved, and clean production is realized and harm of alkaline boric sludge on the environment is solved.