zhenjin refractory

Mafic spinel brick is a chromium-free alkaline refractory material for large-scale rotary kiln firing belt, which uses the characteristics of solid melting of iron oxide in magnesium oxide, using high-purity spinel as raw material, and high temperature sintering to form a chromium-free environmental protection product.

The addition of iron-aluminum spinel solves the problem that chromium-free alkaline bricks are difficult to stick to the kiln skin, and mafic spinel bricks are easier to stick to the kiln skin than directly combined with magnesia chromium bricks, and the use effect is more stable and excellent, which effectively solves the problem of producing hexavalent chromium in the process of cement kiln production of hexavalent chromium polluting the environment.

In addition to the characteristics of high compressive strength, good thermal shock stability, good thermal creep resistance, erosion resistance and permeability, and high load softening temperature, mafic spinel bricks also have the characteristics of easier to stick to the kiln skin than directly combined magnesia bricks, which can effectively solve the problem of generating hexavalent chromium in the use of magnesia chromium bricks for cement kilns, thereby causing pollution to the environment.

Physical and chemical indexes of real gold mafic spinel brick:
Model ZJMI ZJMIA
MgO ≥88 ≥85
Fe2O3 3.5-4.5 3-4
Al2O3 3.5-4.5 ≥8
SiO2 ≤0.8 ≤0.7
CaO ≤1.2 ≤1.2
Bulk density (g/cm3) ≥2.97 ≥2.95
Apparent porosity (%) ≤17 ≤17
Compressive strength (MPa) at room temperature ≥70 ≥70
Load softening start temperature (0.2MPa, t0.6) ≥1700 ≥1700
Thermal shock stability, sub(1100°C, water-cooled) ≥10 ≥12

Magnesia spinel bricks are mainly used for cement rotary kiln firing belt. It is a magnesia alkaline refractory material prepared by high temperature sintering with magnesia and mafic sand as the main raw materials. It is not sensitive to working conditions, and the kiln skin has excellent performance, chromium-free environmental protection, and excellent mechanical properties.

Zhengzhou Zhenjin Refractory Co., Ltd. was established in 1985, located in Xinmi City, Henan Province, China's refractory production base, covering an area of about 70,000 square meters, is a collection of research and development, production, sales, trade and technical services in one of the manufacturing enterprises. The company is committed to cement, lime, nonferrous smelting, steel, glass, chemical industry refractory products provision, construction and installation and other personalized services.
Real Gold Refractory is the drafting unit of the standard for mafic spinel bricks and composite structure silicon bricks for dry cement kilns in the refractory industry in China. Zhenjin Refractory has long focused on the research and development and production of refractory materials, not only developed a series of refractory materials for the cement industry, to meet the various refractory needs of the cement industry, but also around the "nonferrous, lime, chemical" and other industries with refractory needs, developed and produced a series of characteristic products, has created a number of safe use records in cement, and has been recognized by Huaxin Cement, Xingchuancheng Cement, Southern Cement, Mengdian Cement and other domestic cement group enterprises. Real gold products have covered 34 provincial administrative regions in the country, and sold to Greece, South Korea, Japan, the United States, Canada, Chile, Mongolia, Cambodia, Angola and other markets, the products with its stable performance, quality, technology has been trusted and praised by users.