陶瓷原料除铁增白的方法

论述了陶瓷原料中铁杂质的存在形式以及除铁技术的发展现状、介绍了高温氯化法、高梯度磁选法、有机酸处理法、浮选法以及最新的微生物氧化法等增白技术.     

白云母除铁增白试验研究

以河南某厂重选白云母精矿为对象,对其矿物组成以及矿物表面性质进行了检测,系统研究了物理和化学浸出联合除铁工艺对白云母粉白度的影响,其中化学浸出最佳条件为草酸用量为理论值180％,浸出浓度15％,浸出时间1h,浸出温度30℃.结果表明,物理分选-化学浸出工艺可除去白云母粉中70％的铁,并获得白度为77.81％云母产品,基本达到了高端产品对其要求.     

浅谈陶瓷原料的化学除铁

陶瓷原料的除铁是一个重要的工艺过程,通过除铁可以提高陶瓷制品的性能和产品质量。化学除铁是可采用的方法之一。     

高岭土除铁增白方法

简述了高岭土的性能、用途以及其所含铁的赋存状态,详细介绍了高岭土除铁增白常用的几种方法,并对各种方法的优缺点进行了比较,认为同时采用多种方法除铁,能取得更好的漂白效果.     

陶瓷原料铁杂质类型及除铁方法

陶瓷工业使用的天然原料中，一般都或多或少的含有一些杂质，在使用之前，一般要对原料进行精选处理。原料的精选主要是对原料进行分离，提纯，除去原料中的各种杂质，尤其是含铁的杂质，使其化学组成、矿物组成、颗粒组成更符合制品的质量要求，笔者就陶瓷原料中铁杂质类型及除铁方法作一介绍。     

高岭土的化学除铁增白方法研究进展

简述了高岭土的化学除铁增白方法的基本原理,综述了高岭土化学除铁增白法的研究进展,并指出了化学法的发展方向及需要进一步解决的问题.化学法能够根据需要选择合适的化学试剂将高岭土中的杂质溶解除去,除铁效果好,能够得到优质、高白度值的高岭土.针对目前我国高岭土资源储量丰富、品位不高的情况,适宜选用化学法对其进行除铁增白,提高其综合性能及应用价值.同时,仍需对化学法的作用机理进行更深一步的研究,以期解决过程中尚存在的一些问题.     

吉安高岭土的除铁增白

分析了影响吉安高岭土煅烧白度的几个因素。简要介绍了高岭土矿中铁存在的几种形式,并阐述了利用物理和化学方法对高岭士除铁增白。     

问：铁在陶瓷原料中有哪些存在形式？除铁增白的方法有哪些？

答： 1铁在陶瓷原料中的存在形式 铁杂质在陶瓷生产中是有害物,其呈现方式多样,有的呈结核状,有的呈浸染状或网络状分布于粘土中,结核状铁质可用淘洗等方法除去,如果分选度过大的铁杂质则往往采用电磁选矿法除铁。粘土原料中的铁杂质不仅影响陶瓷产品的烧后颜色,而且还严重影响陶瓷产品的介电性能和化学稳定性,对陶瓷产品来说,铁质含量是要严加控制的。粘土中含铁矿物有：     

星子高岭土矿物组成和高梯度除铁试验

对星子高岭土矿的理化性能进行了深入研究和深加工试验,结果表明：星子高岭土是一种结晶较差的高岭石,工艺性能一般,Fe2O3含量一般大于1．3％,经深加工,可降低Fe2O3含量,一般可以达到陶瓷工业用高岭土的一、二级标准,为陶瓷产品高档化创造了条件。     

高岭土除铁增白技术发展

本文综述了近年来高岭土除铁增自的化学方法（氧化法和还原法），介绍了国内外最新的高岭土生物除铁增白技术的发展动态[微生物（T．f．菌）氧化增白法、发醇法产生有机酸除铁增白法。     

Ash from sunflower husk as raw material for ceramic products

The objective of the present work was to characterize a residual material (ash) from edible oil industrial production and to study its feasibility as a starting material for fabrication of ceramics for the construction industry. The characterization of the ash was carried out by a range of techniques, such as humidity content measurement, particle size distribution analysis, weight loss on calcination, scanning electron microscopy and chemical composition analysis by X-ray dispersion energy and X-ray diffraction. The ash was compacted without other additions into “green bodies”, which were treated at different temperatures in order to determine the sintering behaviour, and the occurrence of possible chemical reactions at the processing temperatures. From the experimental results and the analysis of the equilibrium diagrams of the major oxides present, the theoretical sintering temperatures were determined to be too high for an attractive cost-effective industrial scale process. Therefore new mixtures were designed adding different contents of milled discarded (cullet) glass to the ash in order to lower the working temperature. Final sintered products containing 30%, 40% and 50% of ash were produced which exhibit adequate properties for their use as ceramic products with a typology of lightening bricks.     

Mineralogy of clay raw material from Burkina Faso and Niger used for ceramic wares

Some clay deposits in West Africa provide raw materials for the local and traditional manufacture of ceramic products. We selected three clays in Burkina Faso, with the references ROG, GRI and POT and a fourth one, AKN1 in Niger. These clays have been mined for many years. There is growing demand for such materials and the reserves are sufficient to meet this demand. The ROG and GRI clays are used as construction materials in both fired and unfired bricks. The POT and AKN1 clays are used for producing the porous ware of fired pottery. A study was carried out to look at some of the physico–chemical characteristics of these raw materials in order to enhance their use. This is a preliminary study which will be followed by further investigations into the production of different ceramic wares. An analysis of the chemical and mineralogical composition of the materials and some investigations of their fired properties during a firing cycle up to 1000°C has demonstrated that, taken as a whole, they possess satisfactory characteristics for the described applications.     

Comprehensive study of base rocks as raw material for ceramic production

Phase transformations proceeding in base rocks (metadiabases, metagabbro) upon heat treatment are considered. It is found that metadiabases can be used as fluxes in ceramic mixtures intended for high-temperature firing and in raw and fritted glazes as well.     

Post-treated incinerator bottom ash as alternative raw material for ceramic manufacturing

New ceramics based on 60 wt% of alternative raw material derived from post-treated municipal solid waste incinerator bottom ashes and 40 wt% of refractory clay were studied. The chemical analysis of the compositions was evaluated by ICP. The thermal and densification behavior of the ceramic batches were evaluated by DTA-TG and dilatometry techniques, respectively. After that, the degree of sintering at different temperatures and soaking times was evaluated in detail, measuring open and closed porosities, linear shrinkage and water absorption. The crystallinity at different temperatures (during heating and after cooling) and microstructure of the obtained samples were evaluated by high-temperature X-ray diffraction (HTXRD) and scanning electron microscopy (SEM), respectively. For these new ceramics, the experimental results highlighted sintering range between 1190–1240 °C. In addition, the specimens demonstrated low water absorption and high crystallinity (with anorthite as main crystalline phase), leading to mechanical characteristics comparable to those of commercial ceramic products (bending strength > 40 MPa).