碱石灰烧结法处理含钾砂页岩的试验研究  

Experimental Study on the Treatment of Potassic Sandshale by Soda-lime Sintering Process

作　　者：马化龙[1,2] 赵恒勤[1,2] 胡四春[1,2] 

机构地区：[1]中国地质科学院郑州矿产综合利用研究所,郑州450006 [2]国家非金属矿产综合利用工程技术研究中心,郑州450006

出　　处：《矿产保护与利用》2008年第6期15-18,共4页Conservation and Utilization of Mineral Resources

基　　金：国土资源大调查项目(1212010661201)

摘　　要：采用碱石灰烧结法—碱浸工艺,在温度1250℃、时间120 min、配料钙硅比为2.0、碱比为1.0、添加一定量的CaF2焙烧,所得熟料在液固比为3.0、温度为80℃、浸出时间为60 min、浸出液苛性碱浓度为40 g/L和碳酸碱浓度30 g/L条件下浸出,可以得到氢氧化铝、碳酸钾产品,并能得到适合用作硅肥的浸出渣,氧化钾的浸出率达到69.44%,氧化铝的浸出率达到59.23%,所得浸出渣中的有效S iO2为28.40%,有效CaO为51.09%,达到了国家农业部硅肥的行业标准。Using soda -lime sintering process -alkali leaching process, under the sintering conditions of temperature 1 250℃, time 120 minutes, calcium - silicon ratio 2.0, alkali ratio 1.0 and adding a certain quantity of calcium fluoride, and leaching conditions of liquid - solid ratio 3.0, temperature 80℃, time 60 minutes, caustic alkali concentration 40 g/L, alkali carbonate concentration 30 g/L, qualified aluminum hydroxide, potassium carbonate and leaching residue which can be used for silicon fertilizer were obtained. Under these conditions, the leaching rate of potassium oxide and alumina were 69.44% and 59.23% respectively. The effective content of SiO2 and CaO in the leaching residue were 28.4% and 51.09% respectively, and reached the silicon fertilizer industry standards of Agriculture Ministry.

关 键 词：含钾砂页岩 钾长石 碱石灰烧结法 碱浸 氢氧化铝 碳酸钾 硅肥 

分 类 号：TQ133.1[化学工程—无机化工] S157.1[农业科学—土壤学]