CZ32549U1 - Mixture for the production of briquettes from waste mineral wool and its reuse as input raw material for the production of mineral wool - Google Patents

Description

The Industrial Property Office does not ascertain in the registration procedure whether the subject of the utility model meets the conditions of eligibility for protection pursuant to Section 1 of Act no. E. 478/1992 Coll.

Mixture for the production of briquettes from waste mineral wool for reuse as a raw material for the production of mineral wool

Technical field

The technical solution relates to a mixture for producing briquettes from waste mineral wool for reuse as a raw material for the production of mineral wool.

BACKGROUND OF THE INVENTION

In the production and processing of mineral wool, waste is generated, which is mainly used for the production of briquettes, which are part of the raw materials for the production of mineral wool (briquettes are thus reused in the production of mineral wool). The waste containing the formaldehyde resin is first allowed to polymerize in air for 3 weeks, then crushed and homogenized on the recycling line. 54 to 55 wt. depending on the cement content, it is further mixed in the mixing core together with 17 to 18 wt. CEM I cement, 7 wt. % bauxite and 21 wt. dolomite. Subsequently, briquettes are vibrated from the resulting mass. After pressing, the briquettes are pressed onto a support and allowed to cure for 3 days at a temperature of about 20 ° C. The compressive strength after two days of briquette hardening must be at least 3.0 MPa. The briquettes produced in this way are then a part of the input raw materials for the production of mineral fibers, resp. mineral wool.

Cement is used as a binder in the manufacture of said briquettes. The formaldehyde resin contained in the mineral wool waste limits the bonding properties of the cement, which poses a problem in terms of the necessary strength and cohesion of the briquettes for further handling. Cement used as a binder is a costly material since its production is energy and input consuming, while producing a significant amount of harmful emissions.

The aim of this technical solution is therefore to propose a new composition of the briquette production mixture with the aim of increasing their three-day compressive strength, possibly shortening their curing time, and also reduce their production costs by partially replacing the cement binder hitherto used.

The essence of the technical solution

This objective is achieved by changing the composition of the mineral wool briquette mixture for reuse as a mineral wool feedstock, by replacing a portion of the binder (cement) dust from the separated kiln gases in the production of clinker. This material positively affects the hydration environment of cement in briquettes and improves their physical properties, ie compressive strength. It will also reduce the time needed for briquettes to cure, thus shortening the handling time and accelerating the handling of the briquettes. In the same way, the amount of cement needed to produce briquettes will be reduced and thus the costs will be reduced, as cement with higher purchase price is replaced by material (dusting) with lower price. Another significant advantage is that it is a waste material that would represent an environmental burden as unused waste. The object of the invention is thus achieved by a mixture for producing briquettes from waste mineral wool for its reuse as a feedstock for the production of mineral wool, which contains 54 to 56% by weight. % of waste from the production and processing of mineral wool, 16 to 18 wt. % cement, 7 wt. % bauxite and 21 wt. dolomite, the nature of which is that part of the cement is replaced by 0.9 to 2 wt. dedusters from separated kiln gases in clinker production.

The binder is usually CEM class I cement, in particular it can be CEM I 42.5 R or CEM 52.5 N or CEM I 52.5 R manufactured according to EN 197-1. Separation of separated kiln gases, usually in a hose filter, is a by-product of the production of Portland clinker in the production of clinker

In cement rotary kiln. By replacing the cement with a duster, after two days a higher strength of the produced briquettes is achieved, which is in the range of 3.5 to 5.2 MPa.

By adjusting the composition of the mineral wool briquette mixture for reuse as a mineral wool feedstock, this technical solution achieves a cement saving of 5-15%. At the same time, as a result of cement replacement, the reduction in CO2 emissions generated by cement production is approximately 0.52 t CO2 per ton of cement.

Examples of technical solutions

Example 1

16.86 wt. CEM I 42.5 R, 1.14 wt. % of dust from separated kiln gases in the production of clinker and 54 wt. waste from the manufacture and processing of mineral wool. After three days, the compressive strength reached 5.06 MPa. The briquettes made from this mixture were suitable for use in the production of mineral wool as one of the input materials. Cement replacement 1.14 wt. In this case, dust removal represents a 6.68% saving of cement.

Example 2

16.64 wt. CEM 142.5 R, 1.36 wt. % of dust from separated kiln gases in the production of clinker and 54 wt. waste from the manufacture and processing of mineral wool. After three days, the compressive strength reached 4.9 MPa. The briquettes made from this mixture were suitable for use in the production of mineral wool as one of the input materials. Cement replacement 1.36 wt. in this case, it represents 8% cement savings.

Example 3

16% wt. CEM I 52.5 R, 1.6 wt. % of dust from separated kiln gases in the production of clinker and 54.4 wt. waste from the manufacture and processing of mineral wool. The compressive strength reached 4.26 MPa after three days. The briquettes made from this mixture were suitable for use in the production of mineral wool as one of the input materials. Cement replacement 1.6 wt. in this case, it represents a 10% saving of cement.

Example 4

14% by weight of the briquette production mixture was used. % cement CEM I 52.5 R, 2 wt. % of dust from separated kiln gases in the production of clinker and 56 wt. waste from the manufacture and processing of mineral wool. After three days, the compressive strength reached 3.95 MPa. The briquettes made from this mixture were suitable for use in the production of mineral wool as one of the input materials. Cement replacement 2% wt. In this case, dust removal represents 14.3% cement savings.

Example 5

16% wt. CEM I 52.5 R, 0.9 wt. % of dust from separated kiln gases in the production of clinker and 55.1 wt. waste from the manufacture and processing of mineral wool. The compressive strength reached 4.26 MPa after three days. The briquettes made from this mixture were suitable for use in the production of mineral wool as one of the input materials. Cement replacement 0.9% wt. in this case, the cement savings are 5.7%.

-2GB 32549 Ul

The above examples are merely illustrative of embodiments with a particular composition of the composition, and are not intended to limit in any way other combinations within the ranges defined in the claims.

Claims (1)

10 1. Blend for the production of briquettes from waste mineral wool for its re-use as a feedstock for the production of mineral wool, containing 54 to 56% by weight of briquettes. % of waste from the production and processing of mineral wool, 16 to 18 wt. % cement, 7 wt. % bauxite and 21 wt. % of dolomite, characterized in that part of the cement is replaced by 0.9 to 2 wt. dedusting from separated kiln gases in clinker production.