THE STUDY OF MINERAL COMPONENTS IN KAOLINE FROM HUNAN JIEPAI

This paper finds out distributive pattern of principal minerals in Jiepai kaoline and demonstrates the black matter to be not organic matter but fine scaly mica-hematite aggregate in black vein mud, the nanometer mineral-portlandite Ca(OH)(2) in this kaoline is discovered.

Particle agglomeration and inhibition method in the fluidized pyrolysis reaction of waste resin

This work investigated the pyrolysis reaction of waste resin in a fluidized bed reactor.It was found that the pyrolysis-generated ash would adhere to the surface of ceramic particles,causing particle agglomeration and defluidization.Adding kaolin could effectively inhibit the particle agglomeration during the fluidized pyrolysis reaction through physical isolation and chemical reaction.On the one hand,kaolin could form a coating layer on the surface of ceramic particles to prevent the adhesion of organic ash generated by the pyrolysis of resin.On the other hand,when a sufficient amount of kaolin(-0.2%(mass))was added,the activated kaolin could fully contact with the Na+ ions generated by the pyrolysis of resin and react to form a high-melting aluminosilicate mineral(nepheline),which could reduce the formation of low-melting-point sodium sulfate and thereby avoid the agglomeration of ceramic particles.

An Investigation into the Performances of Cement Mortar Incorporating Superabsorbent Polymer Synthesized with Kaolin

Cement-based materials are fundamental in the construction industry,and enhancing their properties is an ongoing challenge.The use of superabsorbent polymers(SAP)has gained significant attention as a possible way to improve the performance of cement-based materials due to their unique water-absorption and retention properties.This study investigates the multifaceted impact of kaolin intercalation-modified superabsorbent polymers(K-SAP)on the properties of cement mortar.The results show that K-SAP significantly affects the cement mortar’s rheological behavior,with distinct phases of water absorption and release,leading to changes in workability over time.Furthermore,K-SAP alters the hydration kinetics,delaying the exothermic peak of hydration and subsequently modifying the heat release kinetics.Notably,K-SAP effectively maintains a higher internal relative humidity within the mortar,reducing the autogenous shrinkage behavior.Moreover,K-SAP can have a beneficial effect on pore structure and this can be ascribed to the internal curing effect of released water from K-SAP.

Improvement of Rice Plant Root by Kaolin Application in Iron Toxicity Condition at Zoukougbeu (Central-West of Côte d’Ivoire)

In the tropics, lowland rice cultivation is often confronted with the problem of iron toxicity. The solution proposed by research in general is the use of industrial silicon. However, the high cost of industrial silicon limits its adoption by farmers. A study was carried out in Zakogbeu;Center-West of Côte d’Ivoire, to assess the potential of kaolin to mitigate the effect of this soil constraint on the root of the rice plant. Five kaolin-based treatments were analyzed (T0 = 0 kg kaolin ha−1, T1 = 366 kg kaolin ha−1, T2 = 736 kg kaolin ha−1, T3 = 1097 kg kaolin ha−1 and T4 = 1465 kg kaolin ha−1 are 0, 200, 400, 600 and 800 kg SiO2 ha−1) in a device in complete random blocks, with 5 repetitions. The results obtained show that kaolin supply increases the length of the root tissue as well as the number of branching of the root of the rice plant. Root tissue increased from 10 cm with T0 treatment to more than 15 cm with treatment T4. The microscopic observation of the roots shows that in the treatment T0, the roots present only primary ramifications and the tertiary and quaternary ramifications are observed with the treatments T3 and T4. The contribution of kaolin is an alternative to inhibit the effect of iron toxicity on the rice plant root development in iron toxicity condition.

Fabrication and Characterization of Bamboo—Epoxy Reinforced Composite for Thermal Insulation

As global warming intensifies, researchers worldwide strive to develop effective ways to reduce heat transfer. Among the natural fiber composites studied extensively in recent decades, bamboo has emerged as a prime candidate for reinforcement. This woody plant offers inherent strengths, biodegradability, and abundant availability. Due to its high cellulose content, its low thermal conductivity establishes bamboo as a thermally resistant material. Its low thermal conductivity, enhanced by a NaOH solution treatment, makes it an excellent thermally resistant material. Researchers incorporated Hollow Glass Microspheres (HGM) and Kaolin fillers into the epoxy matrix to improve the insulating properties of bamboo composites. These fillers substantially enhance thermal resistance, limiting heat transfer. Various compositions, like (30% HGM + 25% Bamboo + 65% Epoxy) and (30% Kaolin + 25% Bamboo + 45% Epoxy), were compared to identify the most efficient thermal insulator. Using Vacuum Assisted Resin Transfer Molding (VARTM) ensures uniform distribution of fillers and resin, creating a structurally sound thermal barrier. These reinforced composites, evaluated using the TOPSIS method, demonstrated their potential as high-performance materials combating heat transfer, offering a promising solution in the battle against climate change.

Development of Kaolin and Glass Fiber Reinforced Composites for Thermal Insulating Panels

In our modern world, where conserving energy is highly valued, thermal insulation panels play a crucial role in reducing heat transfer between two spaces, surfaces, or materials. They are used to enhance the energy efficiency of various industrial applications by minimizing heat loss and temperature control. These panels function as silent protectors, aiding in reducing energy consumption and making things more sustainable and better for the environment. This is where composite materials come in;they are known for their lightweight nature, high strength-to-weight ratio, and excellent thermal insulation properties and have gained significant attention. Researchers are actively engaged in various studies aimed at enhancing these materials further. This research project focuses on the development of kaolin and glass fiber-reinforced composites for thermally insulating panels, to which natural strengthening materials like corn husk and bamboo fibers are added. The aim is to create cost-effective and efficient composite materials for thermal insulation applications by incorporating these components with a binder consisting of potassium silicate, hydroxide, and distilled water. This project involves conducting compression tests, bending tests, impact tests, thermal conductivity measurements, and microscopic analysis to evaluate the mechanical and thermal properties of the developed composites. The profound impact of these engineered composites on thermal insulation panels stands to revolutionize energy conservation efforts, offering a potent avenue to minimize heat loss and enhance overall energy efficiency across an array of industrial sectors.

Catalytic performances of kaoline and silica alumina in the thermal degradation of polypropylene

Polypropylene was cracked thermally and catalytically in the presence of kaoline and silica alumina in a semi batch reactor in the temperature range 400℃～550℃ in order to obtain suitable liquid fuels.The dependencies between process temperatures,types of catalyst,feed compositions and product yields of the obtained fuel fractions were found.It was observed that up to 450℃ thermal cracking temperature,the major product of pyrolysis was liquid oil and the major product at other higher temperatures(475℃～550℃) are viscous liquid or wax and the highest yield of pyrolysis product is 82.85% by weight at 500℃.Use of kaoline and silica alumina decreased the reaction time and increased the yield of liquid fraction.Again the major pyrolysis product in catalytic pyrolysis at all temperatures was low viscous liquid oil.Silica alumina was found better as compared to kaoline in liquid yield and in reducing the reaction temperature.The maximum oil yield using silica alumina and kaoline catalyst are 91% and 89.5% respectively.On the basis of the obtained results hypothetical continuous process of waste polypropylene plastics processing for engine fuel production can be presented.

Dry Separation of Iron Minerals from Low-Grade Coal-series Kaolin

Dry separation of iron mineral from low-grade coal-series kaolin in Hubei Province of China was investigated. The structure and chemical composition of the kaolin ore were determined by X-ray diffraction(XRD) and X-ray Fluorescence(XRF) analyses. The narrow particle size range classification, dry magnetic separation and calcination were carried out to evaluate the particle size distribution, and the relation between the content of iron and the whiteness. Experimental results revealed that the highest content of iron(3.70%) in kaolin ore was in the particle size range from 60 to 74 μm, and pyrite was the main occurrence of iron in the kaolin ore. Dry magnetic separation showed that the removal rate of iron in kaolin ore could be increased obviously after calcination, and the rate of iron removal was 60% in the particle size range from 60 to 74 μm. As pyrite can be transformed into hematite through calcination, thermodynamic studies and XRD analysis showed that the maximum content of hematite was obtained at 900 ℃, which would be more beneficial to magnetic separation.

Alumina Recovery from Kaolin with Mineral Impurities

The alumina recovery from low grade kaolin （K-JS） treated through thermal and mechanical methods was investigated. High grade kaolin （K-SX） was used as comparison. The optimum calcination temperatures for K-JS and K-SX were both 600 ℃, which resulted in 89.34wt% of alumina extraction from K-JS and 83.37wt% from K-SX. With the increase in calcination temperature, the chemical reactivity of calcined K-JS and K-SX to acid decreased. Mechanical treatment was much more effective in increasing the alumina extraction from activated kaolin. Around 99wt% of alumina was extracted from K-JS ground for 10 hours and 95wt% of alumina was extracted from K-SX ground for 20 hours. The IR results showed that the substitute of A1 for Si occurred in calcined K-SX, however, the impurities in K-JS decreased this substitute. More alumina could be extracted from low grade kaolin than that from high grade kaolin under identical thermal or mechanical conditions.

Significance of Impurity Mineral Identification in the Value Addition of Kaolin – A Case Study with Reference to an Acidic Kaolin from India

Kaolin or china clay is a versatile industrial mineral with wide technological applications and is abundantly available in India. The major mineral in kaolin is kaolinite (Al2O3.2SiO2.2H2O). The common ancillary / impurity minerals occurring with kaolin include parent rocks like feldspar and mica, quartz, ferruginous, titanoferrous and carbonaceous materials. The most deleterious impurities in kaolin are iron minerals which imparts colour to the white kaolin. Iron exists as oxides, hydroxides, oxy hydroxides, sulphides and carbonates along with iron stained quartz/anatase and mica in kaolin. Kaolin finds extensive applications in paper, paint, rubber, ceramics, plastics etc. One of the highest value additions for kaolin is as pigment in paper and paint industries. The optical properties are important for pigment applications and removal of the iron impurity is very important to improve this property. Extensive research has been carried out on the nature of iron impurities present in kaolin, which leads to the conclusion that iron is present as a part of the kaolinite or ancillary mineral (mica or titania) structure, which can be termed as “structural iron” or as independent iron minerals such as oxides, hydroxides, oxyhydroxides, sulphides and carbonates, which can be termed as “free iron” [1]. The present paper discusses the iron speciation studies carried out on a typical china clay sample collected from Koraput district of Orissa State in the Union of India. Studies have shown that the major impurity mineral species is in “pyritic” (Iron sulphide) form along with other hydroxides, oxyhydoxides and oxides of Iron. Presence of limonite is also observed in the sample. The identification/quantification of the impurity minerals have played a crucial role in the selection / modification and sequentialisation of beneficiation processes and subsequent processing studies have shown that the sample can be value added to ceramic grade.

Physico-Chemical Characterization of Akoko Mined Kaolin Clay

Over the past several decades, kaolin has been intensively used in ceramics formulation by the indigene of Erusu Akoko, in south western Nigeria. Kaolin is a clay mineral with wide technological applications in the industry. It finds applications in fiberglass, paper, rubber, tires, ceramics, cements, latex, paint, printing inks, catalysts for petroleum refining, medicines, water treatment, cosmetics and others. In the present work, we studied the mineralogy of Erusu clay that had been in use for several generations without understanding the physico-chemical properties. Samples of the material were pre-treated and subjected to analysis. From our results, Akoko clay exhibited decompositional water loss of 13.23% and 13.14% in air and argon respectively at 1000°C. The Brunanuer-Emmett-Teller (BET) analysis showed that the kaolin clay was majorly a mesoporous material and the isotherm was of the type iv. The micropore surface area obtained from t-plot is 9.06 m2/g indicating that the materials also contain micropore with size and volume of 15.611 ? and 0.265 cc/g respectively. The XRD, IR and TEM analysis confirmed the presence of Kaolin and Quarts as the major constituents of Akoko clay.

Synthesis of Acrylic Acid/Kaoline Powder Superabsorbent Composite by Inverse-suspending Polymerization

An acrylic acid/kaoline powder superabsorbent composite with a water absorbency of the superabsorbent composite about 1/800 was synthesized by inverse\|suspending polymerization reaction between acrylic acid monomer and kaoline ultrafine powder. The influence of the dispersant agent on the configuration of the products in the inverse suspension polymerization is investigated. The influences of the kaoline powder,cross\|linker,initiator,neutralization degree and the volume ratio of oil to water phase on the water absorbency of the superabsorbent composites are discussed in the paper.

Development of Eggshell Waste Incorporated with a Porous Host as a Humidity Adsorption Material

The duck eggshell waste was developed to the novel desiccant that is friendly to human and environment.The calcium oxide(Ca O)and calcium chloride(CaCl_(2))as the calcium-based desiccants were prepared from eggshell waste.The Ca O desiccant derived from the eggshell waste sintering at 1300℃,while the CaCl_(2)desiccant was extracted from eggshell waste with the hydrochloric(HCl)solution at difierent concentrations from 5 to 30 wt%.The yield percentage of CaCl_(2)desiccant increased with increasing the HCl concentration to 25 wt%.The humidity adsorption behavior were investigated in the range of 75%-5%relative humidity.The results show the CaCl_(2)desiccant has the highest hydration rate.The porous host from the kaolin was sintered at different temperatures from 200 to 1000℃and incorporated with 30%w/v concentrations of CaCl_(2).The physical properties and the humid-adsorption capacity of all porous host conditions were investigated.The porous host at sintering temperature 800℃has the highest specific surface area.Moreover,the porous host at sintering temperature 800℃with the 30%w/v concentration of CaCl_(2)desiccant has the highest humid-adsorption capacity.

A Comparative Study of Different Drying Processes for a Deformable Saturated Porous Medium

Drying of a deformable saturated porous medium based on convective tempering is a novel method that can enhance energy efficiency and the quality of the dried product itself.In this experimental investigation,the performances of this specific technique are compared with those of a standard stationary drying process in terms of deformation,drying kinetics,moisture redistribution,and energy consumption.In particular,the response of a deformable saturated porous medium(Kaolin)is considered.The results are critically discussed pointing out advantages and drawbacks.

Developing Recipe from Local Ceramic Raw Materials for Making Crucibles in Ghana

The study experimented with using local ceramic raw materials (white clay, kaolin and silica or quartz) found in AssinFosu in the Central Region of Ghana to manufacture crucibles for melting metals and other precious minerals. Various physical tests were conducted on the materials to arrive at the body compositions. The compositions were also investigated for their elemental components by using X-ray fluorescence (XRF). The results revealed that the composition of Cruc containing 70% of white clay, 20% of kaolin, 8% of quartz and 2% of white grog;sintered at 1500˚C was very successful and therefore used to develop the recipe to manufacture the proposed crucibles. The “throwing” technique was employed to fabricate the crucibles. Test for thermal expansion was conducted for the manufactured crucibles at 1000˚C for thermal shock and microcracking tests. It was found out among others, that the recipe developed had very good physical and chemical properties of alumina silicate refractory materials and was fit for use at any high-temperature application. The study also recommended among others, that the researchers and institutions responsible for clay research such as Ghana Geological Survey Authority (GGSA) and Centre for Scientific and Industrial Research (CSIR) collaborate to improve upon this innovative idea.

Kaoline-based catalyst for a high stability desulfurization of sour heavy naphtha in a three-phase oscillatory baffled reactor

To meet the rapidly increasing demand for energy and the dramatic depletion of conventional crude oil,it is imperative to utilize sour naphtha.With no coke being produced,oxidative desulfurization(ODS)of naphtha lowers its sulfur content and average molecular weight.In this article,we outline a method for heavy naphtha non-extractive ODS using a very stable catalyst.The technique involves the use of a solid catalyst with oxygen gas as the oxidant.This necessitated relatively high mixing intensities;hence a three-phase Oscillatory Baffled Reactor(OBR)was used.The catalyst was based on the zeolite ZSM-5,prepared from natural kaolin by a series of delamination and activation steps and impregnated with Fe.A TiO2 nanolayer was applied,using the sol-gel method,to prevent rapid deactivation.The reactor performance was evaluated to minimize the sulfur content in the naphtha fuel.Due to the protective coating,the sulfur conversion stabilized at 90%.The results of this work establish the use of natural clay-based catalysts in a continuous,three-phase ODS,particularly with regard to proving long-term stability.It also showed that modest ODS can be achieved using an environmentally friendly oxidant,at mild operating conditions,whilst maintaining stability.

聚丁二酸丁二酯/聚(3-羟基丁酸酯-co-4-羟基丁酸酯)/纳米高岭土熔融共混力学性能、流变及降解行为研究

用熔融共混挤出法制备的聚丁二酸丁二酯(PBS)/聚(3-羟基丁酸酯-co-4-羟基丁酸酯)[poly(3HB-co-4HB)]/纳米高岭土(nano Kaolin)复合降解材料;利用万能拉力机、旋转流变仪和SEM对其力学性能、流变行为、微观结构及降解性能进行研究。结果表明,PBS/poly(3HB-co-4HB)/nano Kaolin(100/10/8)复合降解材料的缺口冲击强度、断裂伸长率达到最大,此后随着nano Kaolin质量百分比增加,而呈下降趋势;在室外自然条件下,经过土埋一段时间后的降解实验,PBS/poly(3HB-co-4HB)/nano Kaolin(100/10/12)复合材料发生了明显的降解,复合降解材料的失重率也已经降到64%左右,说明材料的降解性能较好;纳米复合降解材料熔融剪切储能模量(G′),剪切损耗模量(G″)随着频率的增大呈单增趋势。

实验性脊髓空洞MRI动态观察及演变分析

目的 :应用 MRI动态观察经皮枕大池穿刺注入 Kaolin诱导的家兔实验性脊髓空洞症模型 ,结合光镜、电镜组织学对比 ,对脊髓空洞症演变过程加以探讨。方法 :取中国白兔 32只 ,16只动物经皮枕大池穿刺注入 Kaolin制作动物模型 ,生理盐水组和假手术组 (各 8只 )作对照。术后行 MRI扫描并与光镜、电镜组织学对比。结果 :2周时 MRI发现上颈髓呈水肿、缺血性改变。 4～ 6周 ,90 %动物形成空洞。空洞随观察时间延长而逐渐增大且受累节段增多。组织学证实了 MRI发现。结论 :Kaolin性肉芽肿引起的上颈髓缺血、水肿和脑脊液循环障碍在脊髓空洞形成中发挥重要作用。其中 ,前者在髓内空洞进展中起主要作用 ,后者在中央管扩张中起主要作用。

银杏注射液防治实验性家兔脊髓空洞症的疗效评价

目的 :评价银杏注射液对枕大池注入 Kaolin诱导的家兔脊髓空洞症的防治作用。方法 :30只中国白兔随机分为 3组。在静脉麻醉下 2 4只动物经皮枕大池穿刺缓慢抽出 0 .6 ml脑脊液后注入等量 2 5 % kaolin;其中 12只于当日起给予银杏注射液静注 5 ml× 7日 ,为银杏组 ;12只以等量生理盐水静注 7天 ,为盐水组 ;6只动物仅作假穿刺和假注射为假手术组以作对照。术后定期行 MRI扫描并取 2周以内灌注的部分组织标本行细胞凋亡、bcl- 2及 bax等研究。结果 :注入 Kaolin后 3～ 16天 ,盐水组有 5只银杏组有 1只死亡。盐水组存活的 7只动物有 2只在 4周、 3只在 6周、 1只在 8周时出现上颈髓或颈胸段空洞 ;银杏组存活的 11只动物中只有 1只在 8周时出现上颈髓空洞。组织切片对比发现同一时间内银杏组组织水肿及神经元变性、坏死等均较盐水组为轻。盐水组神经元凋亡率、Bax反应阳性细胞率高于银杏组 ,而 Bcl- 2反应阳性细胞率低于银杏组。假手术组动物 MRI及组织学观察正常。结论 :银杏注射液可改善Kaolin性肉芽肿引起的上颈髓缺血水肿 。