硼矿的碱解液制硼砂及提纯研究
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摘要
碱解法制硼砂工艺是一种操作简单,碱解率高,收率相对较好的方法,该方法包含硼的浸出和转化两个过程,而后者偏硼酸钠转化为硼砂过程是制约碱解法制硼砂工艺收率大小的重要因素。除杂净化更是决定着产品纯度大小的重要环节。通过调节溶液pH或NaHCO_3添加量来考察硼砂转化率的大小。结果显示,当溶液pH为9.0时,转化率达到82.7%,而当添加NaHCO_3为理论量的1.3倍时,转化率高达86%。两者共同作用时,转化率接近90%。另外,添加盐酸调节pH时能够更好地提高硼砂的纯度。
The alkali hydrolysis process about borax is a kind of method with simple operation,high leaching rate and relatively good income,the method contains leaching processes and transform processes of boron,while the latter is an important factor to restrict the process yield of borax alkaline hydrolysis method. Purifying is an important links to determine the size of the product. Through the size of the conversion rate of borax by adjusting the solution pH or the amount of NaHCO_3. The results showed that when pH is9. 0,the conversion rate reached 82. 7%,and when the addition of NaHCO_3 as the theoretical ratio of 1. 3times,the conversion rate of up to 86%. When they are combined,the conversion rate is close to 90%. In addition,adjusting the pH by adding HCl can improve the purity of borax.
The alkali hydrolysis process about borax is a kind of method with simple operation,high leaching rate and relatively good income,the method contains leaching processes and transform processes of boron,while the latter is an important factor to restrict the process yield of borax alkaline hydrolysis method. Purifying is an important links to determine the size of the product. Through the size of the conversion rate of borax by adjusting the solution pH or the amount of NaHCO_3. The results showed that when pH is9. 0,the conversion rate reached 82. 7%,and when the addition of NaHCO_3 as the theoretical ratio of 1. 3times,the conversion rate of up to 86%. When they are combined,the conversion rate is close to 90%. In addition,adjusting the pH by adding HCl can improve the purity of borax.
引文
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[7]董亚萍.以西藏硼镁矿常压碱解制取硼砂工艺在青海格尔木投产田[J].盐湖研究,1997,5(1):58-59.
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[9]薛向欣,董梦格,杨合,等.富硼渣常压碱解浸出液的净化及硼砂制备[J].自然科学学报,2015,36(6):786-795.
[10]Liu S L,Zhang X P,Cai L P.High temperature B-H2O system E-Ph diagram[J].Rare Earth,1998,16:427-429.
[11]郑学家.硼化合物手册[M].北京:化学工业出版社,2010:20-22.
[2]唐尧,陈春琳,熊先孝,等.世界硼资源分布及开发利用现状分析[J].现代化工,2013,33(10):1-4.
[3]Sui Z T,Zhang P X,Yamauchi C.Precipitation selectivity of boron compounds from slugs[J].Acta Materialia,1999,47(4):1337-1344.
[4]郎建峰,李炳焕,曹文华.富硼渣的碱解反应及活性评价方法的研究[J].河北化工,1997(2):16-17.
[5]李炳焕,曹文华.碱解法从硼铁矿中提取硼的研究[J].化学工程师,2002(2):13-15.
[6]郑学家.硼化合物生产与应用[M].2版.北京:化学工业出版社,2014:27-37.
[7]董亚萍.以西藏硼镁矿常压碱解制取硼砂工艺在青海格尔木投产田[J].盐湖研究,1997,5(1):58-59.
[8]宋丽.富硼渣常压碱浸及浸出液净化结晶硼砂的研究[D].大连:大连理工大学,2013.
[9]薛向欣,董梦格,杨合,等.富硼渣常压碱解浸出液的净化及硼砂制备[J].自然科学学报,2015,36(6):786-795.
[10]Liu S L,Zhang X P,Cai L P.High temperature B-H2O system E-Ph diagram[J].Rare Earth,1998,16:427-429.
[11]郑学家.硼化合物手册[M].北京:化学工业出版社,2010:20-22.