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[en] This article is devoted to boric acid production-materials for protection against neutrons from danburite deposit in Ak-Arkhar. Chemical composition of danburite deposit in Ak-Arkhar is presented. Based on carried out tests, the following conditions for hydrochloric acid decomposition of burnt danburite can be recommended: temperature 90-95 deg C, duration - 60 min, HCl concentration - 20 mass %.