(河北聯(lián)合大學(xué) 冶金與能源學(xué)院， 唐山 063009)
摘 要: 采用HSC Chemistry 5.0熱力學(xué)分析軟件研究不同氣氛和溫度條件對(duì)華南含砷鐵礦石中砷平衡組成及脫砷率的影響，并結(jié)合實(shí)驗(yàn)進(jìn)行驗(yàn)證。結(jié)果表明：在惰性氣氛中，增加Ar及初始As含量能降低體系的O2分壓、提高脫砷率；在還原性氣氛中，鐵礦石脫砷體系氣氛需要適宜的CO含量。當(dāng)CO含量較高時(shí)，O2及CO2能削弱體系的強(qiáng)還原性氣氛，促進(jìn)脫砷；當(dāng)CO含量較低時(shí)，O2的存在不利于脫砷，但CO2的影響微弱。不論在何種氣氛中，提高溫度均有利于脫砷，實(shí)驗(yàn)結(jié)果與熱力學(xué)分析結(jié)果基本吻合。在氧化性氣氛或強(qiáng)還原性氣氛中，由于受動(dòng)力學(xué)條件的限制，仍能獲得一定的脫砷率。
關(guān)鍵字: 含砷鐵礦石；脫砷；熱力學(xué)分析
（College of Metallurgy and Energy, Hebei United University, Tangshan 063009, China）
Abstract:The effects of different atmosphere and temperature conditions on the equilibrium species and arsenic removal about arsenic-bearing ores from South of China were investigated by HSC Chemistry 5.0 thermodynamic analysis software. And some experiments were made to verify the thermodynamic analysis data. The results show that the increase of Ar and initial As content can improve arsenic removal due to the decrease of the partial pressure of O2. In the reducing atmosphere, arsenic removal requires an appropriate CO concentration of the system. When the CO concentration is high in the system, O2 and CO2 promote the arsenic removal by slaking down the strong reducing atmosphere. When the CO concentration is low, O2 has a negative effect on the arsenic removal but the effect of CO2 is feeble. A rise of temperature enhances the arsenic removal in any atmosphere. The experiment results are in good agreement with those of the thermodynamic analysis. But in the oxidizing or strong reducing atmosphere an appropriate arsenic removal can be obtained due to dynamic limit.
Key words: arsenic-bearing iron ores; arsenic removal; thermodynamic analysis
