Kerui News

As the main component of the indefinite refractory, the amount of refractory aggregate is generally 60%-73%, and the amount of refractory powder is 15-40%, both of which have a significant impact on the performance of the indefinite refractory. So what are the commonly used raw materials for refractories? 1. Bauxite clinker Bauxite clinker is made of bauxite ore after high temperature calcination, and its Al2O3content is generally more than 50%. In the unshaped refractory materials, it is common to process bauxite into refractory aggregate and powder. In important parts or parts in direct contact with the hot work equipment of steel and iron, high quality high alumina bauxite clinker should be chosen as refractory aggregate and powder. 2.Layey raw materials Clay materials and refractory clay, divided into hard clay and soft clay and semi-soft clay. Hard clay is mostly kaolinite single mineral type precipitated clay, generally need to be calcined into clay clinker before use. Clay clinker is also known as coke clinker. In unshaped refractories, clay clinker is generally used only as a refractory aggregate. Soft clays are mainly kaolinite-type clays, which are easily dispersed in water, have high plasticity and adhesion, and have good sinterability at high temperatures. Soft…

Unshaped refractories are a mixture of refractory aggregates and powders, binding agents or other admixtures in a certain ratio. It can be used directly or with appropriate liquid blending. This is a new type of refractory material without firing, its refractoriness is not less than 1580 ℃. There are various ways to classify unshaped refractory materials. Classification by chemical character: acidic, neutral, alkaline. Classification by delivery status: shaped products and bulk materials. From a practical point of view, they are generally classified by bonding agent type, refractory aggregate variety and construction production method. Classification according to the type of binding agent There are more types of binding agents, divided into inorganic binding agents and organic binding agents. In addition, inorganic binding agent is divided into cement, chemical, clay and other varieties, the application is very common. Binding agent     Unshaped refractory materials   Type   Examples of materials Cement formation Hardening conditions Inorganic Cement Silicate cement, aluminate cement   hydrated hydraulic hardness   Chemical   Water glass, phosphoric acid, aluminum phosphate, aluminum sulfate, brine  Chemical, polymerization Air hardness Hot hardness   Clay Soft clay   Coalescence, hydration  Air hardness Hot hardness   Superfine powder Activated silicon oxide, aluminum oxide…

1. Masonry process of fire escape wall bricks. (1) Construction preparation: 1) The quantity and quality of refractory materials should be checked in strict accordance with the design requirements before entering. After entering the site, use the crane to lift to the construction area in batches. 2) Pull out the longitudinal and horizontal centerline and horizontal elevation line of the furnace body and mark it out, and verify again before construction to confirm that it is qualified. 3) Level the bottom of the furnace, using 425 cement 1:2.5 (weight ratio) cement mortar for leveling. To cement mortar solidification, according to the center line of the furnace chamber and the center line of the cross wall, pull out the refractory brick masonry masonry line. After checking that the dimensions meet the design requirements, start masonry. (2) Construction of furnace bottom masonry. 1)Lower furnace bottom construction: first use clay standard bricks longitudinally in the furnace bottom to build brick piers, and then use castable prefabricated blocks on its upper surface to cover it, so that it becomes a hollow furnace bottom. 2) furnace bottom insulation layer construction: 1 to 5 layers of masonry body density of 0.7g/cm diatomaceous earth insulation refractory bricks,…

A blast furnace is an iron-making facility. Iron ore and coke are mixed into the blast furnace from the top of the furnace in proportion. At the lower air outlet, high temperature blast air (1000~1200℃) enters the blast furnace, and the redox reaction takes place inside the blast furnace to produce iron slag. The iron containing slag flows out from the lower iron opening of the blast furnace, separating iron and slag. Slag into the slag ditch, flushing water slag into the dry slag pit. The iron is either used to continue steel making or sent to the iron casting machine. Finally, the blast furnace gas is discharged through the de-dusting equipment. This is the whole process of blast furnace iron making. With the development and progress of the steel industry in various countries, blast furnaces are gradually becoming larger, more efficient and longer-lived. For the refractory materials used in blast furnace lining also put forward higher requirements. For example, good refractoriness, high temperature stability, density, thermal conductivity, wear resistance and slag resistance, etc. At present, there are many varieties of refractory materials used in blast furnaces, and the refractory materials used in each part are not the same due…

Many places in China are deeply affected by the epidemic, and all industries are facing the risk of survival difficulties after resuming work and production. In such a severe environment, our company calmly deals with all kinds of challenges and actively responds to the “Belt and Road” initiative, looking for opportunities to develop overseas markets. Finally, after continuous efforts, we have successfully obtained orders for refractory materials production from Russian aluminum industry and become its product supplier in China. 1、Seize the opportunity to explore the international market KRNC was established in 2004, is a comprehensive group enterprise integrating refractory material production, sales, product technology solutions and project turnkey services. After more than ten years’ development, our sales network has spread all over the domestic market and our products are exported to overseas. We learned that a branch company of Russian Aluminum needed to find a new supplier of resistant materials for a new furnace project. After nearly 3 months of communication and negotiation, our company finally got the order. Now, the first batch of products have been produced and successfully shipped to Russia. Focus on scientific and technological innovation to enhance product value Since its establishment, KRNC has paid great…

Recently the ecological and environmental departments informed the upcoming one of air pollution, the radiation range includes most of the region of Tianjin, Beijing and Hebei, all of Henan, most of Shandong, Jiangsu, northern Anhui and other parts of the city. According to the circular issued by the ecological and environmental departments, the government requested the implementation of emission reduction measures around the country as soon as possible to alleviate the impact of pollution, according to the actual local situation, to protect the health of the people. Then the Henan Provincial Pollution Prevention and Control Office published the “Notice on the Launch of Orange and Higher Warnings for Heavy Pollution Weather in the Province”. The notice requires each city to immediately start the heavy pollution weather orange and above level of warning, combined with the local air environment monitoring, industrial sources (except livelihood-related protection enterprises), dust sources, mobile sources of pollution to strengthen control. For iron and steel, thermal power, building materials, non-ferrous, chemical, mining and other large transport vehicle enterprises (more than 10 vehicles in and out per day), according to the requirements, priority arrangements for rail transport, reduce the amount of road transport as well as the prohibition…

Recently, we received a call from a company in Vietnam that needed refractory bricks for furnace repair. The customer’s construction period was short and the delivery time was tight. After communicating with the customer, we arranged for a dedicated person to follow up the project in order to protect the customer’s schedule and construction quality. Our manager led the team to create the project proposal and prepare the required documents. The Vietnamese client had a very high opinion of our service. Three days after we received the inquiry from the client, we quickly confirmed the cooperation. Under the multiple pressures of epidemic prevention and control and production scheduling difficulties, our factory made production scheduling plans overnight to ensure the smooth implementation of the production plan. The factory carries out 24-hour production and at the same time arranges quality inspectors to control the whole production process to ensure product quality. The first batch of customized high alumina bricks has been successfully shipped to the customer’s site. Our company has really realized the shaped bricks to be ready in 7 days after receiving the order. Our high alumina bricks for hot blast furnace are made of local bauxite as raw material. At…

Total refractory solutions and services from a single source We provide complete, reliable and high quality refractory product selection and configuration solutions for customer needs, and comprehensive, feasible and long-life furnace construction services for kiln operation conditions. For 16 years, our company has focused on refractory and industrial furnace applications, product selection, turnkey projects and furnace maintenance to meet the different needs of our customers. Construction guidance details The position of industrial furnaces as an important part of enterprise production cannot be ignored. Their efficiency, stability and economy directly affect the core interests of enterprises. As the saying goes, “three parts material, seven parts construction”, the quality of refractory masonry for furnaces directly determines the effect after it is put into use. From the date of product delivery to the smooth operation of the furnace, our company provides perfect technical guidance for refractory construction. The operation form of service and technology center is integrated to ensure product quality.     How can KRNC provide you with construction guidance? 1.Refractory material delivery and storage Refractory materials are transported to the customer’s site, our company provides reliable product storage methods, precautions, and detailed product construction instructions are attached with the products. 2.Refractory…

Heavy brick–Aluminous silicon series With Al2O3 content as the core index, the optional Al2O3 content is between 30% and 90% depending on the use temperature. Use temperature: below 1700℃ Main raw material: high alumina bauxite aggregate Production process: High-pressure pressing and molding + high-temperature firing. Product characteristics: good compressive strength, wide applicability, high cost performance Main applications: kiln lining, walls and other areas that need to bear weight and high temperature resistance Lightweight brick–thermal insulation series With body density as the core index, clay, high alumina and mullite brick insulation bricks are available according to different using temperatures. Use temperature: below 1500℃ Main raw materials: clay, bauxite, mullite Production process: spray molding + high temperature firing + cutting and forming Product features: strong heat insulation capacity, low body density and low heat capacity Main application: kiln thermal insulation layer Unformed refractories Bulk powder, flexible proportioning, strong adaptability, convenient construction, can meet the environmental conditions of a variety of complex parts of the kiln. Use temperature: below 2000℃ Main raw materials: refractory aggregate, powder, binding agent, admixture, water or other liquid materials Production process: crushing + microcomputer proportioning Product features: hardening without heating, convenient construction, wide applicability Main applications: kiln lining,…

Refractory bricks are widely used in kiln masonry, and the size of refractory bricks is related to the calculation of the amount used in the kiln masonry. Usually, the standard size of refractory brick 230×114×65mm, model T3, in addition to the standard brick there are a variety of other sizes, this article will introduce a part of the refractory brick brick type produced by KRNC. High-alumina brick standard/common name Size(mm) Brick type  T3 refractory brick 230×114×65 straight T6 refractory brick 250×123×65 straight T14 refractory brick 171×113×65 straight T19 refractory brick 230×114×65/55 Axe type T20 refractory brick 230×114×65/45 Axe type T29 refractory brick 230×171×65/55 Axe type T30 refractory brick 230×171×65/45 Axe type T38 refractory brick 230×114×65/55 Knife type T39 refractory brick 230×114×65/45 Knife type Sheet brick 1 230×114×20 straight Sheet brick 2 230×114×30 straight Sheet brick 3 230×114×40 straight Sheet brick 4 230×57×65 straight Common shaped refractory bricks 1 520×230×113 straight Common shaped refractory bricks 2 650×230×113 straight Common shaped refractory bricks 3 780×230×113 straight Common shaped refractory bricks 4 452×230×65 straight G1 refractory brick 230×150×75 straight G2 refractory brick 345×150×75 straight G5 refractory brick 230×150/120×75 knife edge G6 refractory brick 230×150/110×75 knife edge The following are some of the sizes of refractory bricks produced…

The requirements for the use and selection of refractory materials for each part of cement kiln are collected by high alumina brick manufacturer. 1. Refractory materials for the three air duct parts of cement kilns. The Y-shaped parts inside the third air duct, at the elbow and at the closure valve are severely damaged, and the use conditions are the most severe. Therefore, the refractory material here is required to have the characteristics of wear-resistant and anti-scouring, alkali-chlorine erosion, mechanical stress resistance, and good high-temperature stability. High strength alkali resistant bricks, high strength alkali resistant castables, wear resistant castables, wear resistant castables prefabricated parts, calcium silicate plates, diatomaceous earth bricks and light weight castables can be used for lining here. 2. Cement kiln door cover part refractories. Refractory lining body here is affected by mechanical stress, self-gravity, high-temperature gas scouring, material abrasion, etc., when the surface is piled up with high-temperature molten body. Therefore, refractory materials are required to have high temperature resistance, good wear resistance, high temperature volume stability and other characteristics, can choose high alumina low cement refractory castables, mullite castables, high alumina bricks, phosphate combined with high alumina bricks, silica calcium plate and other lining.3. Cement kiln…

Sintered magnesite sand. Usually sintered magnesite sand is the product of direct calcination with magnesite in vertical kiln and rotary kiln. According to the MgO mass fraction calibrated magnesium sand grade, generally the highest grade up to w(MgO)=98%. China magnesite sand base mainly in the south of Liaoning, pure quality. The main impurities in the raw material are SiO2 and CaO, Fe2O3 mass fraction is not high. Sintered magnesia sand by according to the preparation process and magnesium oxide quality fraction is divided into heavy-burning magnesia sand, mid-grade magnesia sand and high-purity magnesia sand. The following table shows the physical and chemical index of common sintered magnesium sand type w(MgO)/% w(SiO2)/% w(CaO)/% CaO/SiO2 molar ratio Volume density/g·cm3 MS98A ≥97.7 ≤0.3   ≥3 ≥3.40 MS98B ≥97.7 ≤0.4   ≥2 ≥3.35 MS98C ≥97.5 ≤0.4   ≥2 ≥3.30 MS97A ≥97.0 ≤0.5   ≥2 ≥3.40 MS97B ≥97.0 ≤0.6   ≥2 ≥3.35 MS97C ≥97.0 ≤0.8     ≥3.30 MS96A ≥96.0 ≤1.0     ≥3.30 MS96B ≥96.0 ≤1.5     ≥3.25 MS95A ≥95.0 ≤2.0 ≤1.6   ≥3.25 MS95B ≥95.0 ≤2.2 ≤1.6   ≥3.20 MS93A ≥93.0 ≤3.0 ≤1.6   ≥3.20 MS93B ≥93.0 ≤3.5 ≤1.6   ≥3.18 NS90A ≥90.0 ≤4.0 ≤1.6   ≥3.20 NS90B ≥90.0 ≤4.8 ≤2.0  …