五水硼砂生产新工艺

介绍了一种生产五水硼砂的新工艺。

不同处理对克服甘蓝自交不亲和性的效果的探讨

在甘蓝自交不亲和系的花期喷洒 5 %的盐水加 0 .3%的硼砂水溶液后使其花期自交 ,可克服甘蓝自交不亲和性 ,提高甘蓝自交不亲和系的结实指数及种子的生活力。

含硼磷酸二铵的生产工艺与控制

介绍了在大型磷酸二铵装置上生产含硼磷酸二铵的生产工艺与控制,采用磷酸酸解与返料混合相结合的方法,把五水硼砂引入管式反应器配酸槽和返料系统,并对造粒后的成品进行两次包裹,可有效防止磷酸二铵产品的吸湿与潮解,抑制产品粉化和结块,以确保产品中w(B)≥0.75%。

Effect of water on behaviour of Na_2B_4O_7·5H_2O and Na_2B_4O_7 in HCl-CH_3OH medium

The reactivity of Na2B4O7·5HaO and Na2B4O7 in non-aqueous HCl-CH3OH solvent system was investigated. The effects of H2O, CH3OH/B mole ratio and reaction time on the reaction at room temperature were examined. Experimental results show that when Na2B4O7·5H2O and Na2B4O7 are the reactants, the dissolved B203 contents are observed to be 98.2% and 99%, respectively, in 5min at the CH3OH/B mole ratio of 4. The decrease of water in the reaction medium was observed to increase the crystallization of NaCI in the order of Na2B4O7〉Na2B4O7·5H2O It was also observed that the boron solution obtained after the reaction could be hydrolyzed by the addition of H3BO3. The results show that HCl-CH3OH system is a more effective solvent compared to H2SO4-CH3OH both in the reactivity and the shortened reaction time.

美国克拉莫硼矿床及波热露天硼矿

在美国加利弗尼亚州的波热附近，世界级的克拉莫钠型硼酸盐矿床以现代露天开采。该矿床为硼砂、四水硼砂晶体及粘土岩的层状、扁豆状沉积序列。矿床形成于稳定的浅湖湖底淤泥中，硼砂矿体向南倾斜并为南部的盆缘构造断裂所控制。富含硼及钠溶液的来源于火山热泉。除矿床地质外，文章还讨论了目前所关注的工程地质问题，如地下水及边坡稳定性。