Method for preparing red brick

Abstract

The invention relates to a method for preparing a red brick, belonging to the technical field of brick preparation. The method comprises the following steps of: preparing a blank by mixing lead-zinc ore-dressing tailing serving as a major raw material with an appropriate amount of raw materials such as clay, reinforcing agent, additive and the like, wherein the using amount of the lead-zinc ore-dressing tailing accounts for 70-80 percent of the total weight of the blank, the using amount of the clay accounts for 15-20 percent of the total weight of the blank, the total amount of the reinforcing agent only accounts for 4-8 percent of the total weight of the blank, and the other additives such as lime can be not added or slightly added according to the chemical components of the lead-zinc ore-dressing tailing; and molding and baking by using corresponding manufacturing processes to obtain a brick product. Due to the adoption of the method, the using amount of the clay can be reduced, the brick manufacturing cost can be lowered, the brick product has excellent performance, the practical compressive strength is more than 15.4 MPa, a practical scheme is provided for the comprehensive treatment of lead-zinc ore, and waste can be changed into valuable and the harmful can be turned into the beneficial; and the preparation method is accordant with the national industrial policy.

Description

technical field [0001] The invention relates to a brick-making technology, in particular to a method for preparing red bricks with beneficiation tailings as the main raw material. Background technique [0002] As one of the main building materials, red bricks are mainly made of clay, but at present, the use of 100% red clay to burn red bricks has been listed as a national restricted industry. In the process of producing red bricks, in order to save a large amount of clay, a certain amount of coal gangue, furnace ash or cinder powder is generally added. Its production method is to add a small amount of coal gangue, furnace ash or coal cinder powder into the clay and stir evenly, then make embryos, dry them in the air, and burn the finished products out of the kiln. Although this method can save a part of red clay, the strength of bricks is reduced. The slag and coal gangue need to be pulverized before being added to the clay, which will increase energy consumption and dust ...

AI Technical Summary

Problems solved by technology

Although this method can reduce the amount of clay and reduce the cost of brick making, calcium sulfate has water absorption characteristics, and the monoclinic crystal structure produced will have a serious impact on the performance of brick products. The biggest problem is that the volume of brick products shrinks greatly, causing The brick cracks, so it has a great influence on the strength of brick products, and the actual compressive strength is less than the standard value of 15.4MPa

[0004] In addition, beneficiation tailings, especially lead-zinc ore tailings, as industrial production waste residue and waste, are inevitable products in mining. According to statistics, one ton of lead-zinc ore is selected as concentrate, only 40 kg, and there are 960 kg of tailings as Waste is discarded, and the disposal of a large amount of tailings has always been a headache. There are many lead-zinc mines all over the country, and the reserves are abundant. Mine; a large amount of mineral processing tailings need to spend a huge amount of money every year to build dams and hoard them. This negative treatment method obviously cannot reduce the pressure of mineral waste on the natural environment. Due to environmental pollution, production has been reduced and slowed down, which has seriously affected the production of lead and zinc metal smelting