SU1299988A1 - Method for removing non-fibrous inclusions from mineral wool - Google Patents

Abstract

The invention relates to the production of thermal insulation building materials and may find application in the manufacture of mineral wool and products based on it. In order to increase the degree of purification of mineral wool from non-fibrous inclusions, the blowing flame is processed by a pulsed flow of combustion products directed at an angle of 40 to 70 to the axis of the flame. 1 ill., 1 tab. (Ls

Description

The invention relates to the production of thermal insulation building materials and may find application in the manufacture of mineral wool and products based on it.

The purpose of the invention is to increase the degree of purification of mineral yata from non-fibrous inclusions.

The drawing shows a diagram of an apparatus for carrying out the method of cleaning mineral wool from non-fibrous inclusions.

 The device contains a fiber-forming unit 1 for processing the melt and forming the blowing plume 2, the receiving chamber 3, in which the reflecting screen 4, the evacuation mechanism 5 and the system 6 for supplying the impulse flow of combustion products connected to the pulse generator 7 are installed. Receiving chamber 3 is connected by overflow 8 to chamber 9 by no-precipitation fiber | in which a conveyor 10 is mounted to form a mine of a cotton mat 1I and a duct 12 of air suction.

The method is carried out as follows.

Continuously flowing mineral expansion is converted by fiber formation unit 1 into fibers and blown flame 2 is directed through receiving chamber 3 towards the reflecting screen 4. The pulsed flow of combustion gas products with a frequency of 10-40 Hz forms in the arrangement in the generator 7, which can be used as the chamber or set of chambers of vibrating combustion, through the supply system 6, acts on the flame of the bulge 2. The nature of the impact of the pulsed flow on the fibers of mineral wool and non-fibrous inclusions is determined by the ratio iem particle relaxation time and the pulse duration

In order to ensure the effective cleaning of mineral wool from non-fibrous inclusions, the duration of the pulses, is chosen in such a way that inequalities are observed

 with

g

where fp, is the relaxation time of the fibers

mineral wool, with; - relaxation time of non-fibrous inclusions, p.

0

five

Crowns and other non-fibrous inclusions, which are practically not deflected by a pulsed stream, fall on the reflecting screen 4, hit it, bounce off and fall on the corolla evacuation mechanism 5, which can be, for example, a screw conveyor. By means of the mechanism 5, the non-fibrous inclusions are removed from the receiving chamber 3 to the waste collection system (not shown in the drawing). The impact of the pulsed flow of combustion products on the plume of the bulge 2 leads to a deviation of the flow of mineral fibers upward, provides a shift of the flight paths of the fibers towards the overflow 8, from where the fiber-free fiber is sucked into the deposited fiber chamber 9 and deposited on the receiving conveyor 10 to form mineral wool 11 .

Example. The mineral melt, consisting of 80% of blast-furnace slag and 20% of basalt, is processed into fibers with a diameter of 7-8 µm using a fiber-forming unit 1 in the form of a multi-roll centrifuge and an air blow torch 2 is formed, which contains individual fibers with a relaxation time p, 6-8-10 with a relaxation time of cf 5 The blow-up torch 2 is directed to a fixed reflecting screen 4 located 6–7 m from the fiber former. I. At the same time, the blowing torch is treated with a pulsed stream of combustion products directed from the bottom at an angle of 50 to the axis of the torch and at a distance of 3-4 m from the fiber former. The pulsed flow is formed in the pulse generator 7 and distributed over the cross section of chamber 3 through the supply system 6. As the generator 7, a vibrating combustion chamber is used, which allows the kitszoo to burn exhaust gases periodically at a frequency of 20 Hz when burning a mixture of natural gas and air m / s The flow rate of natural gas is 20 nm / h, the flow rate of air is 450 nm / h, and the pulse duration is

0

blood flakes with more than 10 s.

0

five

0

-four

C. Thus, the sums of inequality, i.e., 6.10 s. t 10 s.

In this case, the directed impact of the pulsed flow reorients the trajectory of the fibers in the direction of the overflow 8 into the fiber deposition chamber 9. At the same time, the beads and other non-fibrous inclusions do not alter the trajectories, reach the reflecting screen 4, hit it and ricocheted to the bottom of the receiving chambers 3, from where they are evacuated by mechanism 5.,

When 2 lumps of mineral wool with non-fibrous inclusions are formed in the plume, the impact of the pulsed flow of combustion products leads to their deformation and the release of fibrous inclusions from them.

The invention allows to provide a high degree of purification of mineral wool from non-fibrous inclusions (particles of slag, coke, kilns, incl.

Bulk weight

The number of beads,% (including the size of 0.25 mm)

Heat conductivity coefficient, kcal / mch hail.

The share of waste to be recycled, of the total mass of the melt,%

Melt consumption per 1 m of product, kg / m

size and, 25 mn), which leads to a higher quality of cotton wool and its products (see table), as well as to a decrease in the density of cotton wool, associated with the saving of material and energy costs. The specific consumption of the melt is 3-6%.

1 m of wool reduced by

Claims (1)

Invention Formula The method of cleaning mineral wool from non-fibrous inclusions by means of processing 1: and the blowing flame of the fiber in bottom-directed flows, affecting the flame with a reflective screen, evacuating non-fiber inclusions and sucking the cleaned wool, characterized in that, to increase the degree of cleaning, the blowing flame is processed A pulsed flow of combustion products directed at an angle of 40-70 to the axis of the torch. 75-80 6.3 0.036 25 31 116 I1 12