Method and arrangement for feeding fine-grained matter to a concentrate or matte burner of a suspension smelting furnace

1. An arrangement for feeding fine-grained matter to a concentrate or matte burner of a suspension smelting furnace,

wherein the arrangement comprises a feeding bin configured for feeding fine-grained matter into a fluidization arrangement,

wherein the fluidization arrangement for producing fluidized fine-grained matter and for feeding fluidized fine-grained matter into a dosing bin that is located at a level below the fluidization arrangement,

wherein the dosing bin is configured for feeding fluidized fine-grained matter to a conveyor assembly that is located at a level below the dosing bin and that is in communication with the concentrate or matte burner of the suspension smelting furnace for feeding fluidized fine-grained matter to the concentrate or matte burner of the suspension smelting furnace by means of the conveyor assembly,

wherein the arrangement comprises a loss-in-weight controller between the dosing bin and the conveyor assembly for controlling the feeding of fluidized fine-grained matter to the conveyor assembly,

wherein the arrangement comprises a scale assembly for determining the weight of the fluidized fine-grained matter in the dosing bin, and

wherein the arrangement comprises a filling valve between the fluidization arrangement and the dosing bin for opening and closing a communication between the fluidization arrangement and the dosing bin and wherein the filling valve is configured to open valve when the weight of the fluidized fine-grained matter in the dosing bin goes below a pre-set low limit, and subsequently to close the filling valve when the weight of the fluidized fine-grained matter in the dosing bin goes above a pre-set high limit,

wherein the arrangement further comprises an impact cone arranged below the filling valve for distributing fluidized fine-grained matter flowing from the fluidization arrangement within the dosing bin,

by a recorder configured for recording an actual filling time for filling the dosing bin, wherein the actual filling time is a time starting from opening of the filling valve and ending by closing of the filling valve, and

by a comparer configured for comparing the recorded actual filling time and a standard filling time for filling the dosing bin.

2. The arrangement according to claim 1 , characterized by the arrangement being configured to increase fluidization of the fine-grained matter if the recorded filling time is longer than the standard filling time.

3. The arrangement according to claim 1 , characterized by the arrangement being configured to decrease fluidization of the fine-grained matter if the recorded filling time is shorter than the standard filling time.

4. The arrangement according to claim 1 , characterized by the standard filling time is a pre-determined filling time.

5. The arrangement according to claim 1 , characterized by a calculator for calculating an average filling time of several recorded actual filling times, wherein the average filing time is the standard filling time.

6. The arrangement according to claim 1 , characterized by the loss-in-weight controller being a part of a weighting means for determining the weight of the fluidized fine-grained matter in the dosing bin.

7. The arrangement according to claim 1 , characterized by the impact cone being supported from the filling valve.

8. The arrangement according to claim 1 , characterized by arranging the impact cone below half of the height of the dosing bin.

9. The arrangement according to claim 1 , characterized by the impact cone being supported by means of a metal support structure such as a steel support structure that is attached to a body structure of the filling valve.

10. The arrangement according to claim 1 , characterized by the impact cone being hanged by metal wires such as steel wires or by metal chains such as steel chains at a body structure of the filling valve.