HU209276B - Process for producing coarse ceramical products containing waste materials as well - Google Patents

Abstract

The mix comprises (w/w%) 5-40 flue dust with min. 2% C content, 5-15 water, 1-4 soda, 1-10 sodium aluminate, less than 2 aluminium phosphate and 1-10 water glass. It is homogenised and mixed with 0.5-5 cement and 50-80 clay material, then shaped and ignited by conventional methods.(Dwg.0/0)

Description

(57) EXTRAS

The present invention relates to a process for producing a coarse ceramic product containing waste material.

The process of the present invention provides a coarse ceramic product containing waste material from clay, additives, water and waste material containing carbon by homogenizing, shaping and firing the materials.

The process is characterized in that 5-40 parts by weight of carbon powder, preferably at least 5% by weight carbonaceous powder, 5-15 parts by weight of water, 1-4 parts of soda, 1-10 parts of sodium aluminate, 0.2-2 parts of aluminum. mixing phosphate with 1 to 10 parts by weight of water glass, homogenizing the mixture and then adding 0.5 to 5 parts by weight of cement, then mixing 50 to 80 parts by weight of clay with the homogenized mass and processing it at 280-290 kp / cm ² , It is fired at 810-830 ° C.

Scope of the description: 4 pages

HU 209 276 B

HU 209 276 Β

The present invention relates to a process for producing a coarse ceramic product containing waste material.

Coarse ceramic products are traditionally made from clay and various additives.

Nowadays, however, there is an increasing tendency to incorporate certain waste materials into the coarse ceramic mass.

According to Hungarian Patent Application No. 183800, additives to the clay mass and waste oil sludge are mixed and the homogenized mixture is formed and fired.

Thus, a coarse ceramic product, in particular brick, is produced.

A coarse ceramic product is prepared from a pulp of red mud according to German Patent 2063 020 and Japanese Unexamined Publication No. 79 039 436.

According to German Patent Publication No. 3 403 943, molded bodies are made of fly ash powder and alkali oxide.

Hungarian Patent No. 181691 describes the preparation of a refractory material containing an aluminum phosphate additive.

In our experiments we have found that the so-called fly dust, which mainly collects in the cyclones of metallurgical plants as waste material, can be utilized very well for coarse ceramic products. The carbon content of such fly dusts is much higher than that of fly ash and gives the product a higher porosity when fired.

The composition of the powders is as follows: Fe ₂ O ₃ : 540 wt%, Al ₂ O ₃ : 2-30 wt%, CaO: 2-20 wt%, MgO: 1-8 wt%, K ₂ O: 0.5- 2% by weight, Na ₂ O: 0.2-1% by weight, carbon: 5-15% by weight and SiO _{2 in an} amount of 100%.

Fly powders, in particular blast powders from blast furnaces, are considered to be energy-supplying due to their high carbon content above 5% by weight.

Its use implies the use of the product for a useful purpose and, on the other hand, the combustion of the product also saves energy during the combustion of the product and gives the finished product many advantages over fly ash.

The carbon content greater than 5% by weight of the metallurgical fly ash used in the process of the invention increases the homogeneity of the finished product.

In addition, the mineral phase of the metallurgical fly ash is different from that of the fly as the Ca silicates present in the metallic fly powder are more crystalline than the Ca compounds in the fly which provide greater homogeneity and strength to the finished product in water glass and sodium aluminate. .

Additives that improve the glass transition properties of the mixture are also used in the composition of the invention.

In addition to the crystalline phase upon burning, a glassy phase also appears in the case of the clay mass containing the additives according to the invention. Its presence reduces the firing temperature.

Sodium aluminate and water glass are used as such additives.

The addition of water glass to the clay mass also acts as a binder, helping to homogenize the mass. A more homogeneous mass enables the production of a finished product with higher and more uniform strength properties.

The combination of clay, cement and water glass greatly increases the strength of the finished product.

The use of cement significantly improves the compressive strength of both the raw molded product and the burnt product.

The coarse ceramic mass produced according to the invention also contains an aluminum phosphate additive to reduce the firing temperature.

The present invention relates to a process for making a coarse ceramic product containing waste material from clay, additives, water and waste material containing carbon by homogenizing, shaping and firing the materials.

The process is characterized in that 5 to 40 parts by weight of carbon powder, preferably at least 5% carbon by weight, preferably 5 to 15 parts by weight of water are added, 1-4 parts by weight of soda, 1 to 10 parts by weight of aluminum aluminate, 0.2 to 2 parts by weight of aluminum are added. phosphate and 1 to 10 parts by weight of a water glass solution, the mixture is homogenized, then 0.5 to 5 parts by weight of cement are added, then 50 to 80 parts by weight of clay are added to the homogenized mass and the mass is processed in a known manner.

The process according to the invention advantageously produces a coarse ceramic product of bricks, tiles, tiles. 290-290 kg / cm ² and calcined at 810-830 ° C.

The advantages of these products are:

- we can recycle waste,

- saving the product by incineration, by reducing the incineration temperature on the one hand and utilizing the carbon content of the waste material on the other,

- the product obtained has higher mechanical strength, in particular compression strength,

- the product is more homogeneous,

- due to the higher strength of the crude product before firing, the percentage of debris resulting from fracture and crumbling is lower.

The following examples illustrate the process of the invention.

Example 1

10 parts by weight of 15% C, 25% Fe ₂ O ₃ , 15% Al ₂ O ₃ , 3% CaO, 2% MgO were added to the mixer. wt% K ₂ Ot 0.5 wt% Na ₂ Ot and

Fly powder from blast furnace containing 38.5% SiO ₂ .

Add 3 parts by weight of water mixed with 10 parts by weight of water and 2 parts by weight of sodium aluminate.

HU 209 276 Β

The mixture was homogenized and mixed with 0.5 parts aluminum phosphate and 3 parts water glass.

The mixture is then homogenized, 4.5 parts by weight of cement are added, and after 5 minutes of mixing, 67 parts by weight of clay are added.

The mass was homogenized and pressed from a homogeneous mass at a pressure of 240 kp / cm ² , which was dried at room temperature for 36 hours. The brick is then fired at 820C for 5 hours. The product is allowed to cool in the oven and then removed from the oven.

Example 2

30 parts by weight of the carrier powder of Example 1 were weighed into an apparatus equipped with a stirrer.

8 parts by weight of water mixed with 1 part of soda and 8 parts of sodium aluminate are added.

The mixture was homogenized and mixed with 0.5 parts aluminum phosphate and 8 parts water glass.

After 1 minute of mixing, 1 part by weight of cement is added and 53.5 parts by weight of clay are added to the homogenized mixture.

Further, roof tiles are pressed from the homogenized mass at 280 kp / cm ² . The molded body is dried at 28 ° C for 32 hours and then fired in a tunnel oven at 815 ° C for 6 hours.

The product was then allowed to cool in the oven and removed.

Example 3 (Comparative)

The properties of the product of Example 1 are compared with those of a control product prepared as described in Example 1. The control product contained clay, instead of metallic phosphate, water glass and cement, and 4% by weight carbon ash instead of metallurgical fly ash.

The control product had to be fired at 860 ° C.

For the control product, the crumb rejection rate was 5.0%, while for the composition of the invention, the rejection percentage was 0.4%. Compressive strength data were measured for both the raw (pre-firing) and the fired product.

Compressive strength MPa Water absorption% Raw product (by serving) 2.4 - Burned products (by dish) 10.5 25 Raw product (control) 1.9 - Fired product (control) 6.5 34

Comparative studies show that the composition of the present invention can be manufactured more economically and has greater compressive strength and structural homogeneity; there are no cracks, no larger bunkers - which is indicated by the increased water uptake in the control.

Claims (1)

PATIENT PERSONALITY Process for the production of a coarse ceramics product containing waste material from clay, additives - soda, sodium aluminate, aluminum phosphate, water glass, water and carbonaceous waste material by homogenization, formulation and burning of the materials, comprising from 5 to 40 parts by weight of carbonaceous host rock , preferably a metallurgical transfer port, 1-15 parts by weight of soda dissolved in 5 to 15 parts by weight of water, 1 to 10 parts by weight of sodium aluminate, 0.2 to 2 parts by weight of aluminum phosphate and 1 to 10 parts by weight of water glass are homogenized and added to 0, 5 to 5 parts by weight of cement, the homogenized mass is then mixed with 50-80 parts by weight of clay, and the mass is worked up in a known manner, i.e. at a pressure of 280-290 kp / cm ² at 810-830 ° C.