钛工业固废制备氧化铁红及其在陶瓷黑色料中的应用

Preparation of Iron Oxide Red from Titanium Industrial Solid Waste and Its Application in Ceramic Black Pigments

钛工业固废中的富铁尾泥因常年堆积对环境造成了严重污染,为实现富铁尾泥无害化、资源化处理,本研究通过酸浸-除杂-氧化-煅烧工艺路径,利用其中铁资源生产的氧化铁红作为铁源,制备铁铬尖晶石并将其应用在黑色陶瓷。考察了初始Fe^(2+)浓度、反应物摩尔比及氧化温度对氧化铁黄晶种的影响,以此为基础,探究了不同煅烧温度对氧化铁红、氧化铁红形成铁铬尖晶石及黑色陶瓷发色的影响。结果表明:由富铁尾泥酸浸提纯后得到氯化亚铁溶液,在Fe^(2+)浓度为0.4 mol/L、反应物摩尔比为2.2∶1、氧化温度为35℃的条件下,所得的氧化铁黄晶种在750℃煅烧温度下制备出纯度为98.875%、平均粒径为2.973μm、圆棒状、结晶度高的氧化铁红。以此为原料,在1280℃煅烧制备得到的铁铬尖晶石在黑色陶瓷色板发黑效果最好,色度值L^(*)为37.35,与标样相比仅相差0.57。

The accumulation of iron-rich tailings,a solid waste from the titanium industry,poses significant environmental pollution risks.To address this and convert the tailings into valuable resources,this study employed an acid leaching-purification-oxidation-calcination process.This process utilized the iron content in the tailings to produce iron oxide red,which is then used as an iron source to synthesize iron-chromium spinel for application in black ceramics.This paper investigated the effects of initial Fe^(2+)concentration,reactant molar ratio,and oxidizing temperature on the formation of iron oxide yellow crystal seeds.Building on this,the study explored how different calcination temperatures influence the properties of iron oxide red,its conversion into iron-chromium spinel,and its impact on the coloration of black ceramics.The results show that under the conditions of 0.4 mol/L Fe^(2+)concentration,a reactant molar ratio of 2.2∶1,and an oxidation temperature of 35℃,the iron oxide yellow crystal seeds obtained from acid-leached purified ferrous chloride solution are calcined at 750℃.This produced red iron oxide has a purity of 98.875%,an average particle size of 2.973μm,and a high degree of crystallinity in a rod-like shape.Using this red iron oxide as a precursor,the iron-chromium spinel formed by sintering at 1280℃exhibits the best blackening effect in black ceramic color plates,with a L^(*)value of 37.35,differing by only 0.57 from the standard sample.