Preparation method of high alkaline shale sintered brick

Abstract

The invention specifically relates to a preparation method of a high alkaline shale sintered brick. The preparation method comprises the following steps of: first, crushing aired high alkaline shale; adding pulverized coal with same fineness and stirring for 10-60 minutes at 60-80 DEG C; aging for 20-48 hours in an aging storeroom; extruding and forming in an extruder; maintaining a blank formed; and drying and sintering to obtain the anti-frost return shale sintered brick. The method provided by the invention has the advantages of simple process and good anti-frost return effect. The method further has the advantages that 1) no extra additives are added into a proportioning system, so that the process is concise and stable; 2) the blank used in high temperature and high humidity and acidic atmosphere on the one hand can reduce emission of harmful gases, and on the other hand, can use inferior sulphur coal, so that the application path of inferior resources in the field is expanded; and 3) a molten compact structure is formed on the surface through an eutectic evaporative substance, so that the channels through which harmful ions enter can be reduced, and therefore, the service life of the product can be prolonged, and the sintered brick has a certain decorative effect.

Description

technical field [0001] The invention specifically relates to a method for preparing high-alkali shale sintered bricks, which are mainly used as building wall materials. Background technique [0002] Sintered bricks or blocks have the characteristics of good chemical stability, convenient construction and low price. They are widely used in urban and rural construction in my country. Among them, fired clay bricks are used in the largest amount. The destruction of land reached more than 1.5 million mu, which seriously threatened the red line of guaranteeing 1.8 billion mu of arable land in our country. With the further implementation of the wall reform policy, shale has become the main raw material to replace clay, and together with coal gangue, fly ash, and river silt, it has become the four major new wall material raw materials. [0003] my country's shale brick production began in the 1960s and 1970s. First, a number of brick factories were built in Sichuan and Guizhou, and ...

AI Technical Summary

Problems solved by technology

[0003] my country's shale brick production began in the 1960s and 1970s. First, a number of brick factories were built in Sichuan and Guizhou, and then Liuzhou, Baise, and Guilin in Guangxi also successively built a number of brick factories. In the 1980s and 1990s, Jiangsu Shale brick factories have also been built in China, Zhejiang, Lianghu, Guangdong, Shandong, Shanxi, Northeast China, Tianjin and other places; however, some new problems have also appeared in the process of using shale to make bricks, such as: The problem of frosting of sintered bricks due to excessive high temperature has seriously affected the application and promotion of shale sintered bricks. Especially under the new requirements of energy saving and emission reduction, shale sintered bricks are gradually developing towards porous and hollow. As the surface area increases, the phenomenon of frost return is more serious. Generally speaking, the sealing effect is mainly adopted in the construction stage to reduce the problem of frost return in the actual use process. However, due to the high alkali content of some shales, hollowing still exists during use. , Various quality problems of cracking