论文部分内容阅读
含锡石的矿石中锡的化学分析准确性的关键之一是锡石的分解是否完全。锡石(SnO_2)的分解方法,据文献记载,有过氧化钠熔融,碘化铵蒸馏,氢氧化钠——碳粉(或锌粉)熔融,碳酸钠——硫磺焙烧;氰化钾熔融法等若干种。但实际用于厂矿化验室的,却仅有过氧化钠熔融法一种。我们以前曾试验用锌粉——焦性硼酸钠还原焙烧分解锡石,有一定效果。锌粉——氯化铵还原焙烧法,亦可用于锡石的分解。此外,国外还试验用高压酸分解法,以及使用氟化钠——硼酸混合熔剂熔融分解锡石。
One of the keys to the chemical analysis of tin in ores containing cassiterite is whether the decomposition of cassiterite is complete. Cassiterite (SnO 2) decomposition method, according to the literature, sodium peroxide melting, ammonium iodide distillation, sodium hydroxide - carbon powder (or zinc powder) melting, sodium carbonate - sulfur roasting; potassium cyanide melting method And so on a few kinds. However, the actual laboratory for the use of factories and mines, but only a sodium peroxide melting method. We have previously experimented with zinc powder - coke sodium borate reduction roasting cassiterite, a certain effect. Zinc powder - ammonium chloride reduction roasting method, can also be used for the decomposition of cassiterite. In addition, foreign experiments with high pressure acid decomposition method, and the use of sodium fluoride - boric acid mixed flux melting cassiterite.