中文摘要：

粘土钒矿是一类重要的钒资源。某粘土钒矿的性质分析表明，粘土钒矿的主要化学组分为SiO2，Al2O3，属酸性矿石，适宜采用硫酸浸出；其中的钒以低价不溶的V（Ⅲ）为主，大部分赋存于伊利石矿物的硅一氧四面体微晶结构中，为了将钒浸出来并进一步提高钒的浸出率，必须破坏伊利石矿物的晶体结构、并利用氧化剂（助浸剂）将低价钒转化为高价钒。针对现有提钒工艺的不足，依据粘土钒矿的性质特点，提出了一种不磨不焙烧直接酸浸提钒的新工艺，并系统考察了各浸出因素如硫酸用量、助浸剂种类及用量、浸出时间、浸出温度、液固比等对钒浸出率的影响，结果表明，粘土钒矿不磨不焙烧直接酸浸提钒工艺是可行的，当H2s04用量为30％、助浸剂选用Mn02、其用量为1．5％、浸出时间为6h、浸出温度为90℃、液固比为1：1时，钒的浸出率达92．58％，浸出效果理想。与传统提钒工艺相比，新工艺省去了高成本的磨矿工序以及复杂的焙烧工序，既简化操作、降低成本，又避免了焙烧污染，符合现代化工冶金的要求。

英文摘要：

Argillaceous vanadium ore was one of important vanadium resources. The property analysis of a certain argiUaceous vana- dium ore revealed that the argillaceous vanadium ore belonged to acidic ores and was suitable for leaching using sulfuric acid based on its main chemical compositions of SiO2 and A12 O3, and it was necessary to destroy the lattice structure of illite and change the low va- lence vanadium into high valence vanadium with oxidant （ assistant leaching agent） in order to leach vanadium and further improve the vanadium leaching rate, for most of the vanadium in argillaceous vanadium ore existed in the form of low valence V（ 11[ ） which was in- soluble and located in silicon-oxygen tetrahedron microcrystalline structure of illite. And then, aiming at shortages of the existing vana- dium extraction technologies, a new technology of direct acid leaching vanadium without grinding and roasting was put forward accord- ing to properties of argillaceous vanadium ore. The effects of leaching factors including dosage of sulfuric acid, type and dosage of as- sistant leaching agent, leaching time and temperature, liquid-solid ratio on the vanadium leaching rate were systematically investigated. The results showed that the technology of direct acid leaching vanadium from argillaceous vanadium ore without grinding and roasting was feasible and the leaching performance was perfect, and the vanadium leaching rate could reach 92.58% under the optimal condi- tions of sulfuric acid dosage of 30% , MnO2 as assistant leaching agent and its dosage of 1.5% , leaching time of 6 h, leaching temperature of 90 ℃, liquid-solid ratio of 1 ： 1. Owing to leaving out the high cost grinding procedure and the complex wasting procedure, the new technology had the advantages of shortening the process, decreasing the cost, avoiding pollution generated by roasting comparing with the traditional technologies, and it could meet the requirement of modem metallurgy very well.