SU975636A1 - Raw mix for producing sulfoaluminate clinker - Google Patents

Description

(54) RAW MIXTURE FOR OBTAINING SULPHALUMINATIC CLINKER

The invention relates to the building materials industry and can be applied at the stage of the preparation of the raw mix in the production of expanding additives to the cement. The known raw material mixture for the production of cement clinker, including carbonate, aluminosilicate and sulfophobic components 1. . The closest to the technical essence and the achieved result of the invention is the raw mix 2 for producing sulfoaluminate clinker, including limestone, aluminosilicate components and gypsum, in the following ratio of components, wt.%: Limestone component42-78 AluminosilicumType component .20-38 Gypsum2 -20 A disadvantage of the known raw material mixture is the low hydration activity of the clinker. The purpose of the invention is to increase the hydrate activity of clinker. This goal is achieved by the fact that the raw mix for obtaining sulfoaluminate clinker, including limestone, aluminosilicate components and gypsum, contains lanthanide-containing waste from mining and metallurgy production as the aluminosynum component in the following ratio, wt.%; The lanthanide-containing mining and smelting waste 20-31 Gypsum2-11 Lime componentThe remaining Lanthanide-containing mining and smelting waste has the following chemical composition, wt.%: SiOj40-67 TiOj0.5-2 ALO18-18-25 FejOj8-10 MnO0.2-0.9 MgO0, 6-4,0

Cao

0.2-5

NajO

035-2 /)

Kjo

0.45-2.0

CrjOj 0.01-0.09

VaO, 0.02-0.08

Lanthanides

0.05-0.5

NiO 0.02-0.03

P205

0.1-03

Loss on ignition

For the first time in the cement industry

A raw material mixture has been composed, containing nonvolatile and refractory valuable and rare elements, which, along the way, must be removed at the burning stage of the raw material mixture.

The composition of the raw material mixture primarily takes into account the formation of the highest amount of the most important minerals for sulfoaluminate clinker: calcium sulfoaluminate and bicapital silicate (belite). In addition, the lanthanides contained in the clay component of the raw material mixture | (rare-earth elements of REE), which are the most refractory part of the raw material, while ensuring proper firing mode can be seen as their melt in iron and a piece of glass together with clinker through a refrigerator, after which they are magnetised from the clinker and are Other variants of the heat treatment of raw mixtures according to the invention are possible, in which the lanthioids are not alto tc in

The bead, while ensuring the appropriate technological process of heat treatment is transferred to low melting compounds, is sublimated and removed from the furnace with exhaust furnace gases in the form of sublimate salts, which sublimate at low temperatures and are deposited in the fritted dust collection plants. Precipitated sublimates are enriched in rare-earth element concentrates and are used for further processing.

The salts of nickel, vanadium, potassium, phosphorus, manganese, chromium, titanium, etc. present in the rare-earth raw materials cause a significant acceleration of the decarbonization reaction of the limestone component and a decrease in its onset temperature by 50–150 ° С. The ions of these salts replace the calcium ion in the calcite lattice, which distorts the surface ionic layer of crystals, weakens the ionic bonds in the lattice, and accelerates the electron and ionic motions that make up the process of thermal decomposition of CaCO3.

Example. The composition of raw mixes for sulfoaluminate clinker, the mineralogical composition of clinker and the degree of extraction of rare-earth elements are presented in Table. one; The chemical composition of lanthanide-containing waste from mining and smelting production in the mixtures in table. 2

9975636

The raw meal mixtures are ground to the same grinding fineness (the residue on sieve No. 008 is 6.5-7.0%) and calcined in a rotary clinker kiln.

The data table. 1 indicate the possibility of 5 nosgs for extracting rare-earth elements (up to 56%) from raw mixtures at the stage of their roasting in cement production.

In addition, the strength of the sulfoaluminate clinkers obtained is increased by 10 10-200 kgf / cm.

. F o rmula of the invention

Raw mix for sulfoaluminate clinker, including limestone, aluminosilicate components and gypsum.

ten

characterized in that, in order to control the hydration activity of wedge-kera, it contains as an aluminosilicate component a lanthanide-containing waste from mining and metallurgical production at the following ratio of components, wt.%: lanthanide-containing moves of mining and metallurgical production 20-31 Gypsum2-11 Known kvy component

Sources of information taken into account in the examination of 151. Proceedings of the Moscow Institute of Chemical Technology. D.I. Mendeleev,

, Vol. 36, 1961, p. 129.

2. USSR author's certificate in application number 2936186 / 29-33, cl. From 04 To 7/35, 1980,

Claims (1)

Claim The raw material mixture for producing sulfoaluminate clinker, including limestone, aluminosilicate components and gypsum, characterized in that, in order to increase the hydration activity of the clinker, it contains lanthanide-containing wastes 5 of mining and metallurgical production as an aluminosilicate component in the following ratio of components, wt.%: Lanthanide-containing mining and metallurgy waste chemical production 20-31 10 Gypsum 2-11 Limestone component Rest