Preparation method for periclase composite spinel brick used for cement kiln clinkering zone

Abstract

The invention discloses a preparation method for a periclase composite spinel brick used for a cement kiln clinkering zone. The method comprises the following steps: firstly, preparing a magnesium sand granule material, a ferric oxide powder and an alumina powder; and synthetizing into hercynite granule material and pleonaste granule material at a certain ratio; weighing the above materials as follows: 6-15 parts of synthetized hercynite granule material, 40-55 parts of synthetized pleonaste granule material, 35-45 parts of magnesium sand granule material, 1-3 parts of ferric oxide powder and 1-2 parts of alumina powder; adding 2-5 parts of magnesium chloride solution or sulphurous acid paper pulp solution in the above materials for milling; then pressing the mixture in a press to obtain a green brick; and after drying, sintering and forming. The preparation method has the advantages that the sintered finished brick has the characteristics of compact tissue structure, high strength, excellent alkali corrosion resistance and thermal shock stability, good spalling resistance and is an ideal product for a large cement kiln clinkering zone and kiln coating is easy to hung. The product fills up the national blank, reaches the international leading level and can replace the same type of imported products.

Description

technical field [0001] The invention relates to a chromium-free refractory material for a firing zone of a cement kiln, in particular to a preparation method of a periclase composite spinel brick for a firing zone of a cement kiln. Background technique [0002] With the implementation of my country's building materials industry's grand cross-century strategic goal of "from big to strong, relying on new ones", cement kilns are developing towards large-scale, high-yield, and energy-saving directions, and new dry-process cement production technology has been widely promoted and applied in my country . As of 2010, there are more than 1,000 new dry-process cement kilns with a capacity of 1,000 t / d or more in the country, with an annual output of 1.88 billion tons of cement, accounting for 58.5% of the total cement output. increment. The authoritative organization predicts that by 2015, there will be 1,300 new dry-process cement kilns, the cement output will reach 2 billion tons,...

AI Technical Summary

Problems solved by technology

However, due to the fact that the CaO hydration problem in my country's raw materials has not been fundamentally resolved, the effective storage period of the product is short, and the waste in the use process is serious, which seriously restricts the popularization and application of the product; although the magnesia spinel brick is in the transition zone It has been successfully used, but due to the failure to effectively solve the problem of sticking the kiln skin, the following fatal shortcomings have been exposed in the use of the firing zone: ① It is difficult to form a stable kiln skin with the cement clinker, so that the products of the cement kiln are directly affected by 1800 during the operation of the cement kiln. ℃ Flame impact and material wear, the service life is greatly reduced

②Due to the high thermal conductivity of magnesia spinel bricks and the lack of kiln skin protection, the temperature of the cement kiln cylinder rises, and the cylinder undergoes elliptical deformation under the action of thermal stress, which not only increases the mechanical stress borne by the lining material, but also Aggravate the damage of the cement kiln and seriously affect the safe operation of the cement kiln