Fireclay mining in Kimovsk coalfields

Conclusions The laboratory and industrial investigations of fireclays in the Kimovsk coalfields corroborate their suitability for the production of grade B chamotte and ceramic ware.The deposits of fireclay in the Kimovsk coalfields may serve as an additional source of raw material for the refractory plants of the Central region.The quality of the fireclays may be substantially improved by a thorough removal of gangue and coal from the top layer and selective miningby medium power rotary excavators.The complex exploitation of the deposit is economically justified insofar as fireclay mining is a secondary process with the per ton cost not exceeding 90 kopeks.     

Fireclay Refractory Bricks

This standard is applicable to the fireclay refractory bricks which are not otherwise specified.     

Fireclay Refractory Mortars

1 ScopeThis standard specifies the classification,technical requirements,test methods,quality appraisal procedure,packing,marking,transportation,storage and quality certificate of fireclay refractory mortars.This standard is applicable to the fireclay refractory mortars for laying fireclay refractory bricks.     

Fireclay refractories in pyrometallurgical processes

In primary liquid metal production, the temperature of processing and the composition of the slag phase largely determine the selection of the refractories used to line the furnace. The objective of this work was to study the effect of temperature and FeO content on the dissolution rate of a clay refractory.50-g samples of synthetic, prefused iron oxide and silica were poured into slip cast crucibles of a high-duty fireclay. These were then placed in a preheated silicon carbide-element furnace and held at the required temperatures for known times. The cooled crucibles and their contents were broken and the amount of crucible wall thinning which had taken place at the slag-refractory interface was measured using a low-power microscope and a calibrated graticule.The study of the effect of process temperature was carried out over the temperature range 1100°–1400°C at 50°C intervals. Only two compositions, 65 and 75 wt.% FeO, were chosen for this part of the work.The effect of slag composition was next studied at 1300°C, the range of slag compositions being 60–80 wt.% iron oxide at 5% intervals in the iron oxide-silica system. Only one high-duty fireclay composition was studied throughout the tests.The outcome of the work was to show that for the iron oxide-silica compositions studied a high-duty fireclay refractory can be used to contain the melts if the temperature of the process is maintained below 1300°C and when the slag composition is less than the orthosilicate composition (2FeO.SiO₂).     

Fireclay slit checker brick

Conclusions A batch of block slit firebrick was produced for hot blast stoves of blast furnaces and qualitative characteristics of the brick determined. The brick can be prepared with the existing technology for making standard brick for hot blast stoves.It is undesirable to use the SM-143 press for making the slit brick. It is possible to recommend the production of such brick on friction presses 4KF-200.Technical specifications were drawn up and confirmed for slit bricks.Translated from Ogneupory, No. 3, pp. 8–11, March, 1967.     

Fireclay refractories for service in reducing conditions

Conclusions The Chasov-Yar Refractories Combine has organized the production of firebrick of 57 standard sizes for lining the shafts of furnaces used for direct reduction of iron oxides.Tests of brick with an open porosity of up to 16% and up to 1.5% Fe₂O₃ showed that they are resistant to reducing conditions in a current of CO at 500°C for 500 h. These refractories have been in use since 1983 at OÉMK in the linings of shaft furnaces used for reduction firing of nodules. During service the working layer of the refractories becomes saturated with fine dust from the nodules, become densified and worn due to abrasion. The pores of the refractory are saturated with a small amount of finely dispersed carbon.A TU 14-8-606-90 standard specification is being prepared — Refractory fireclay shapes for constructing shaft furnaces used for nodule metallization. The bricks will be designated ShPSh-41.Translated from Ogneupory, No. 5, pp. 33–34, May, 1991.     

Investigation of Alkali Resistance of Fireclay Fillers

Refractories and Industrial Ceramics - Alkali resistance of fireclay fillers used for the production of dry mixtures of refractory concrete has been investigated. Evaluation of the alkali...     

Fireclay Refractory Bricks for Glass Melting Furnace

This standard is applicable to fireclay refractory bricks with unit weight ≥ 50 kg for glass melting furnaces.     

Fireclay Refractory Bricks for Hot Blast Stove

This standard specifies the classification, shape, dimension, technical requirements, test method, inspection rules, packing, marking, transportation, storage and quality certification of fireclay refractory bricks for hot blast stove.     

Analysis of Deformation of a Fireclay Refractory

Rate process theory was applied in a study of the creep behavior of a fireclay refractory (firebrick) after different heat treatments. The analysis was based on the assumption that, in the absence of phase changes, equivalent deformation substructures are produced for a given strain at constant stress independent of temperature. An activation energy of about 170 kcal/mole was determined for the flow process in a heat-treated firebrick, which corresponds closely to the value for mullite specimens. Varying but higher values obtained under different test conditions indicated that phase changes were also occurring during the creep tests. The effect of the amount and texture of the components on the creep behavior and strength of the firebrick specimens is discussed. Useful correlations based on this approach are presented, making it possible to predict creep behavior at constant or variable temperatures and also to calculate stress distributions through a wall containing a temperature gradient after a given strain is reached in a given time.     

Fireclay Brick and Semi-silica Brick for Coke Oven

YB/T 4168-2007 1 ScopeThis standard specifies the technical requirements,test methods,quality appraisal procedure,packing,transportation,storage,and quality certificate of fireclay brick and semi-silica brick for coke oven. This standard is applicable to the fireclay brick and semi-silica brick for coke oven,and the bricks for inner linings of carbon furnace,gas generator and shaft furnace.     

Corrosion of AZS and Fireclay Refractories in Contact with Lead Glass

Corrosion processes of Al₂O₃-ZrO₂-SiO₂ and Al₂O₃-SiO₂ refractories were studied. Chemical, microscopic, and X-ray diffraction investigations are reported. The results are interpreted using the SiO₂A1₂O₃-K₂O and SiO₂-Al₂O₃-PbO phase diagrams. An explanation is put forward regarding the process of corrosion by K₂O and PbO.     

Fireclay Refractory Mortars GB/T 14982-2008

1 Scope This standard specifies the classification, techni-cal requirements, test methods, quality appraisal pro-cedure, packing, marking, transportation, storage and quality certificate of fireclay refractory mortars.     

Fireclay mortar with a casting binder as a plasticizing additive

A composition of a fireclay mortar with a casting binder as a plasticizing additive is described. Results of a study of the properties of a mortar of grade MSh39 with a composite plasticizing agent (soda ash+LST) and a casting binder are presented. It is established that use of a casting binder in the composition of a fireclay mortar increases the adhesion between the mortar and the refractory, decreases the thickness of the joint, and simplifies the production process of the mortar. Translated from Ogneupory i Tekhnicheskaya Keramika, No. 2, pp. 35–36, February, 1998.     

粘土矿渣耐热复合材料的凝固动力学

利用迁移理论公式对于粘土矿渣耐热复合材料的凝固动力学进行了计算和分析。查明,增加粘土组份的细分散性时对半干成型或者振动成型的试样的开始速度的增大均有良好的影响,并且降低了其抑制系数。矿渣组份的单位表面积的增大对抑制系数值的影响较小。