Method for handling a slag pot or ladle and pyrometallurgical tools

Patent metadata

Field	Value
Publication number	US-11091650-B2
Application number	US-201716466880-A
Country	US
Kind code	B2
Filing date	Dec 7, 2017
Priority date	Dec 8, 2016
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

Method for handling a slag pot or ladle or pyro-metallurgical tools comprising the steps of spraying a mineral suspension onto a wall and putting into service of said slag pot or ladle or of the pyro-metallurgical tool, wherein said mineral suspension comprises calcium particles in suspension in an aqueous phase forming a calcium particle slurry containing a carbon hydrate at a content between 0.2 and 3%.

First claim

The invention claimed is:

1. A method for handling a slag pot or ladle having a given temperature and having an inner wall and an outer wall, said method comprising the steps of
a) spraying a mineral suspension on said inner wall, the temperature of said slag pot or ladle being greater than 100° C., so as to line said inner wall with a mineral layer, prior to the steps of:
b) collecting a slag in said slag pot or ladle, lined on its inner wall with said mineral layer, of a gyro-metallurgical tool,
c) transporting said slag pot or ladle from said pyro-metallurgical tool to a slag drop-off site,
d) emptying said slag pot or ladle at said slag drop-off site in order to eliminate the slag contained in said slag pot or ladle,
wherein step a) is performed with the purpose of putting into service said slag pot or ladle lined with said mineral layer in order to repeat steps b) to d), and
wherein said mineral layer is a thin layer lined on the inner wall, having a layer thickness between 0.1 and 5 mm, and in that said mineral suspension comprises an aqueous phase and a mineral phase, said mineral suspension having a carbon hydrate content between 0.2 and 3% by weight relative to the total weight of said mineral suspension; and
wherein said mineral suspension comprises one or several additives selected from the group consisting of dispersants, fluidifying additives and mixtures thereof, and wherein said dispersants and fluidifying additives are selected from the group consisting of polycarbonates, polyacrylates and polyphosphonates.

2. The method of claim 1 , wherein said mineral suspension contains a calcium particle slurry containing calcium particles, said calcium particles having an average particle size d 50 between 1.5 μm and 10 μm.

3. The method of claim 1 , wherein said carbon hydrate is selected from the group consisting of sucrose, saccharose, sorbitol, xylose, glucose, galactose, fructose, mannose, lactose, maltose, glucuronic acid, gluconic acid, erythritol, xylitol, lactitol, maltitol, dextrins, cyclodextrins, inulin, glucitol, uronic acid, rhamnose, arabinose, erythrose, threose, ribose, allose, trehalose, galacturonic acid, and mixtures thereof.

4. The method of claim 3 , wherein said carbon hydrate is selected from the group consisting of sucrose, saccharose, sorbitol and mixtures thereof.

5. The method of claim 1 , wherein said mineral suspension contains a calcium particle slurry, said calcium particle slurry has a viscosity between 0.1 Pa·s and 2 Pa·s.

6. The method of claim 1 , wherein said mineral suspension contains a calcium particle slurry containing calcium particles, said calcium particles of the calcium particle slurry have a particle size d 97 between 7 and 100 μm.

7. The method of claim 6 , wherein said mineral suspension contains a calcium particle slurry, which is a lime slurry containing particles of slaked lime at a content between 20 and 60% by weight relative to the total weight of said lime slurry and wherein said lime slurry has a reactivity expressed in the form of a dissolving time t(90%) greater than 0.1 s.

8. A method for lining an inner wall of a slag pot or of a slag ladle with a mineral layer using a mineral suspension, wherein said mineral suspension is sprayed and has a content in carbon hydrate between 0.2 and 3% by weight, relative to the total weight of said mineral suspension, and wherein said mineral layer has a layer thickness between 0.1 and 5 mm; and
wherein said mineral suspension comprises one or several additives selected from the group consisting of dispersants, fluidifying additives and mixtures thereof and wherein said dispersants and fluidifying additives are selected from the group consisting of polycarbonates, polyacrylates and polyphosphonates.

9. The method of claim 8 , wherein said mineral suspension contains a calcium particle slurry containing calcium particles between 20 and 60% by weight relative to the total weight of said calcium particle slurry.

10. The method of claim 9 , wherein said calcium particles in the calcium particle slurry of said mineral suspension have an average particle size d 50 between 1.5 μm and 10 μm.

11. The method of claim 8 , wherein said carbon hydrate is selected from the group consisting of sucrose, saccharose, sorbitol, xylose, glucose, galactose, fructose, mannose, lactose, maltose, glucuronic acid, gluconic acid, erythritol, xylitol, lactitol, maltitol, dextrins, cyclodextrins, inulin, glucitol, uronic acid, rhamnose, arabinose, erythrose, threose, ribose, allose, trehalose, galacturonic acid, and mixtures thereof.

12. The method of claim 11 , wherein said carbon hydrate is selected from the group consisting of sucrose, saccharose, sorbitol and mixtures thereof.

13. The method of claim 11 , wherein said calcium particle slurry has a viscosity between 0.1 Pa·s and 2 Pa·s.

14. The method of claim 13 , wherein said calcium particles of the calcium particle slurry have a particle size d 97 between 7 and 100 μm.

Assignees

• Lhoist Rech Et Developpement Sa

Inventors

• Denollin Guillaume

Classifications

• F27D1/0006

  Linings or walls formed from bricks or layers with a particular composition or specific characteristics · CPC title

• F27D1/1636

  Repairing linings by projecting or spraying refractory materials on the lining · CPC title

• F27D1/1678 Primary

  Increasing the durability of linings; Means for protecting · CPC title

• C21B3/10

  Slag pots; Slag cars · CPC title

• C09D7/63

  organic · CPC title