SU1694513A1 - Raw mixture for producing expanded clay aggregate - Google Patents

Description

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(21) 4722120/33 (22) 07.19.89 (46) 30.11.91. Bul N-44

(71) Orion Special Design and Technological Bureau at the Novocherkassk Polytechnic Institute

(72) Yu.E.Ponomarev, A.V.Timonov and N.V.Rester her (53) 666.972.125 (088.8)

(56) USSR Author's Certificate N 581119, cl. From 04 To 14/12, 1976.

USSR author's certificate Mg 1212999, cl. From 04 To 14/12, 1983 „

(54) RAW MATERIAL MIXTURE FOR OBTAINING CERAMSITE

(57) The invention relates to the production of building materials and can be used in the production of expanded clay. To reduce the bulk density of haydite, the raw mix includes, in wt.%: Clay materials, 97.5-99.5; addition of 0.5-2.5 from a mixture of 17-33 wt.% solid lignosulphonate and 67-83 wt.% solid lignosulphonate and 67-83 wt.% waste iron powder production. The resulting claydite in fractions 5-10 and 10-20 mm has a bulk density of 270-520 kg / m when using argillite waste, shale and loam. 2 tab.

The invention relates to the production of building materials and can be used for the manufacture of expanded clay.

The purpose of the invention is to reduce the bulk density of claydite.

The raw mix for obtaining expanded clay includes, in wt.%: Clay materials 97.5- 99.5; addition of 0.5-2.5 from a mixture of 17-33 wt.% solid lignosulfonate and 67-83 wt.% waste production of iron powder.

Lignosulfonate is used brand T (solid) OST 13-183-83 Lignosulfonates technical (LST).

Waste production of iron powder is characterized by the following chemical composition, wt.%: Fe 95-32; SI02 0.60; AfeOa 1; CaO 0.46; MgO 0.16; S03 0.08; Tyu2 0.08; carbon 0.96; MriO 0.35. “20 0.06 NazO 0.02-; CO-2 0.17.

The main component is metallic iron, the content of the other component is negligible.

Iron powder with a particle size passing through a 0.15 mm sieve (1% residue) was used, the specific surface of the powder was 2000– 2500 cm2 / g.

Waste is generated during the production of iron powder for thermal hydrodynamic pressing and is the product of collecting vent emissions and magnetic separation waste. The volume of such waste in one plant is 4500 - 5000 tons / year.

As clay raw materials, waste of argillite, shale and loam is used. Clay raw material meets the requirements of GOST 25264-82 Clay raw materials for the production of expanded clay gravel and sand, Technical requirements and test methods.

Raw clay materials are ground in a ball mill to the fineness of grinding, corresponding to the passage through a sieve with a hole size of 0.63 mm

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To the powder, 0.5-2.5 wt.% Organic mineral additive is added, after thorough mixing, moistened with a small amount of water to a moisture content of 14 to 16% and formed into granules of 10 to 12 mm in size. Dried granules are heat treated at 200 - 250 ° C for 15 minutes. The swelling is carried out at 1175-1200 ° C for 7 minutes in a silium oven.

The properties of the resulting claydite with the average amount of the organo-iron supplement and the ratio of its components are presented in Tables 1 and 2.

Claydite C is obtained from the raw mix with a bulk density of 270-520 kg / m in fractions of 5-10 and 10-20 mm.

The organic component of the additive is LST powder — salts of lignosulfonic acids, which are a complex complex of wood delignification by sulfonation, in which organic compounds of lignin type (80–90 wt.%) And about 10 wt.% Reducing substances, bacterial life products, are basic.

In the proposed addition, the glandular component is a fine powder of metallic iron that does not require any prior preparation, the size of the powder particles is comparable with the size of the clay particles.

The combination of fine iron powder with a lignosulfonate complex, which is a supplier of reducing gases as a result of thermo-oxidative destruction of lignosulfonates, contributes to the formation of finely cellular structure of claydite, which ensures the production of claydite with low bulk density. With the full implementation of the invention, unused waste is involved, it becomes possible to organize the production of an additive for supplying more than $ 50 to enterprises of the country that produce clay with dry preparation of raw materials.

Claims (1)

Claims Raw materials mixture for obtaining expanded clay, including clay raw materials and organic additive from production wastes, characterized in that, in order to reduce the bulk density of expanded clay, it contains as an additive a mixture, wt.%: Solid lignosulfonate 17-33; waste production of iron powder 67-83 in the following ratio of components of the raw mix, wt.%: Clay raw materials97,5-99,5 Additive from a mixture of solid lignosulfonate and iron powder production waste 0.5-2.5 The properties of expanded clay obtained from the waste of crushing of stone-like clay rocks and loam with the introduction of an organic additive with a different ratio of organic and mineral components Note. Temperature interval of swelling of waste of stone-like clay rocks is 1175-1200 ° С; loam 1100-1125 C. Swelling time 7 min. Table 1 The properties of expanded clay obtained from the waste of stone-like clay rocks and a suglass with a different amount of additive