CN102464461A - Method for doping coal ash in coal gangue baked brick - Google Patents

Abstract

The present invention relates to a method for preparing wall materials, and in particular to a method for preparing sintered bricks using coal waste, which mainly increases the content of fly ash mixed in the process of making bricks from coal gangue by pre-treating the gangue, thereby making the most of the coal waste.

Description

A method of doping fly ash in coal gangue sintered bricks

technical field

The invention relates to a method for preparing wall materials, in particular to a method for preparing sintered bricks from coal waste.

Background technique

Over the years, my country's brick industry has been using clay as the main raw material, but the extensive use of clay has seriously damaged land resources. As the National Development and Reform Commission, the Ministry of Construction and other four departments jointly issued the "Opinions on Further Improving the Work of Prohibiting the Use of Solid Clay Bricks" (Fagai Huanzi No. 249), it is clearly required to vigorously carry out the work of "banning solid clay bricks". New bricks sintered with coal gangue and fly ash as the main raw materials have become the main substitutes for clay bricks. At present, there are many researches on related preparation methods in China, and certain results have been obtained and put into production and application. However, domestic brick making is mainly divided into two categories at present, one is coal gangue sintered bricks, and the other is fly ash autoclaved bricks. Although a small amount of fly ash can be added to coal gangue, the addition ratio is relatively low.

Contents of the invention

The purpose of the present invention is to increase the content of fly ash that can be mixed in coal gangue sintered bricks, make the ratio of coal gangue and fly ash reach 1:1, and utilize waste resources to the greatest extent.

Specific steps include:

a. After the coal gangue is crushed until the particles are less than 3 mm, coarse salt is mixed in a ratio of 50:1, and put into a brick kiln for roasting pretreatment at high temperature.

b. Mix the pretreated coal gangue and fly ash at a ratio of 1:1, add a small amount of clay and an appropriate amount of water at the same time, mix and age after mixing, cut into billets, dry and roast in a kiln.

c. After the roasted product is cooled to room temperature, it is sprayed with water and dried to become a finished product.

Detailed ways

After crushing 1,000 kg of coal gangue, mix it with 20 kg of industrial salt, and enter the kiln for roasting pretreatment while firing other bricks; mix the pretreated coal gangue with 1,000 kg of fly ash, 200 kg The clay is mixed with an appropriate amount of water and aged for more than 24 hours; the aged raw materials are extruded in a two-stage vacuum rigid plastic brick extrusion machine with an extrusion pressure of 3.5-4MPa and a vacuum degree of 0.95-0.82 to extrude bricks. The moisture content of the bricks is controlled at 11-13%; the extruded bricks should be dried to increase the strength of the bricks, and preheated before entering the kiln to prevent the bricks from breaking during firing; the firing temperature of the bricks in the mechanical tunnel kiln is controlled at 1000 -1100℃, roasting for 24 hours; after the brick leaves the kiln to cool, it needs to be watered to prevent the finished brick from bursting.

Claims (5)

1. A method of doping fly ash in coal gangue sintered bricks, specifically comprising the following steps: a. After the coal gangue is crushed until the particles are less than 3 mm, it is mixed with salt at a ratio of 50:1, and put into a brick kiln for roasting pretreatment at high temperature. b. Mix the pretreated coal gangue and fly ash at a ratio of 1:1, add a small amount of clay and an appropriate amount of water at the same time, mix and age for at least 24 hours, then cut into billets, dry, and roast in a kiln. c. After the roasted product is cooled to room temperature, it is sprayed with water and dried to become a finished product. 2. A method of doping fly ash in gangue sintered bricks according to claim 1, characterized in that: the gangue in the step a should be pretreated at high temperature. 3. A method of doping fly ash in coal gangue sintered bricks according to claim 1, characterized in that: the coal gangue in the step a is mixed with salt in a ratio of 50:1 after pretreatment mix. 4. A method for doping fly ash in coal gangue sintered bricks according to claim 3, characterized in that: the salt in the step a is coarse salt or industrial salt. 5. A method of doping fly ash in coal gangue sintered bricks according to claim 4, characterized in that: the content of sodium chloride in coarse salt or industrial salt is greater than 80%.