RU2447038C1 - Method of making bricks - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to production of construction materials. The method of making bricks involves mixing molybdenum-containing industrial wastes in amount of 4-6% with clay in amount of 80-82% and sawdust in amount of 12-13%. Before mixing, the clay held in sulphide-distillery stillage for 12-20 hours.

EFFECT: high strength of articles.

1 ex, 2 tbl

Description

The invention relates to the production of building materials and may find application in the disposal of industrial waste.

A known method is in which wood sawdust is additionally added to the utilized raw material in an amount of 20-22% (Patent 2334715, published September 27, 2008, IPC С04В 111/20).

The disadvantage of this method is that the utilized raw material contains 37-42% phosphogypsum binder. In addition, the high content of wood sawdust 20-22% does not provide the strength of the brick.

The closest technical solution is the method in which, on the basis of recycled industrial waste, brick is made (G. Khubaeva. Prospects for the use of non-ferrous metallurgy waste in production // Journal of Non-Ferrous Metallurgy, No. 3, 2002, p.21-22).

However, the resulting product when the content of molybdenum-containing raw materials is environmentally insufficiently stable, and the produced brick with the addition of water to the waste is not strong enough.

The technical result of the claimed object is to obtain high-quality brick products with the simultaneous utilization of molybdenum-containing raw materials.

The technical solution lies in the fact that the brick is prepared from molybdenum-containing industrial waste in an amount of 4-6% with the addition of clay 80-82% and sawdust 12-13%, and the clay is preliminarily held for 12-20 hours in a sulphide-alcohol bard.

The method is as follows.

Clay (Table 1) in an amount of 80-82% is mixed with molybdenum-containing wastes of the Pobedit plant in an amount of 4-6% and sawdust 12-13% in a metering hopper. Before kneading, the clay is kept in an alcohol bard for 12-20 hours to reduce its acidity and improve the strength of the brick during firing. All ingredients are sent to molding and fired at a temperature of 930 ° C, followed by drying for 2-3 days to a moisture content of 7-8%. Clay has a high sorption ability to absorb molybdenum-containing waste to a minimum.

Silicon contained in clays has a crystal lattice and is a highly sorption element. Its inclusion in the alcohol bard ensures the quality and strength of the brick. The composition of the brick with the inclusion of clay and sawdust ensures the safety of the resulting products for the environment. The composition of the stillage includes (%): dry matter - 6-8; crude protein - 1.6-2.2; BEV (nitrogen-free extractive substances) - 2.4-4; fat - 0.4-0.6; fiber - 0.8-1.7; ash - 0.5-0.7; acidity - 4.2-4.9 (pH).

Table 1 The chemical composition of clay SiO ₂ Al ₂ O ₃ TiO ₂ Fe ₂ O ₃ Pl ₂ O ₅ MnO Cao MgO K ₂ O Na ₂ O SO ₃ FeO pH 60.9 16.45 0.88 6.45 0.17 0.14 2.92 1.65 2.20 1.72 0.1 0.86 8.5

Example. Clay in the amount of 10 tons is fed into the bunker, which is poured with sulphide spirit bard in the amount of 1000 l, after 12-20 hours, waste containing 700 molybdenum and 1.3 tons of sawdust is fed into the solution. The components are mixed and fed to the mold. The formed and cut bricks go to the automatic stacker, then are loaded onto drying trolleys and into drying chambers. Dried raw stuff is placed on kiln cars and served in a kiln. Brick firing temperature is 930 ° С. The firing time depends on the amount of furnace charge. Raw get high strength cast mass. Raw material of good quality, its porosity increases, which provides a high-speed heating process throughout the firing. The drying process is also accelerated from 72 to 60 hours, fracture decreases, the presentation of the finished product improves, the strength of the product increases, and marriage is reduced. The chemical composition of the obtained product is (%): Fe - 5.1; Mo is 0.002; Si - 24.4; Cu - 0.9; K - 1.6; W - 0.023.

The application of the proposed method reduces the moisture content of clay by mixing it with sulphide bard, resulting in an accelerated drying process for 15 hours, and this leads to a decrease in the consumption of natural gas, electricity, increase production by reducing rejects. The results of the experiments are presented in table.2.

table 2 Experience Options The ultimate strength, kgf / cm ³ Bulk density, kg / m ³ General linear shrinkage,% 1. Prototype control 18.2 1470 4.1 2. Molybdenum-containing waste 2-4%
Sawdust 5-10% 19.2 1530 4.4 3. Molybdenum-containing waste 5-8%
Sawdust 5-10%
Clays 75-80% 24.6 1610 4.7 4. Clays 80-82%
Sawdust 10-15% 21.5 1490 4.2 5. Suggested: clay aged in bard for 12-20 hours + Molybdenum-containing waste 4-6% + Sawdust 12-13% 30,0 1680 5.5 6. Clay aging in bard for 12-20 hours + Molybdenum-containing waste 7-8% + Sawdust 16-20% 23.8 1590 4.6

Claims (1)

A method for the production of bricks, including mixing molybdenum-containing industrial waste with the addition of wood sawdust, characterized in that the production of bricks is carried out on the basis of molybdenum-containing waste in an amount of 4-6%, which are mixed with clay in an amount of 80-82% and with wood sawdust 12-13 %, and clay before mixing is kept in sulfide-alcohol bard for 12-20 hours