Method for Handling a Slag Pot or Ladle and Pyrometallurgical Tools

Patent metadata

Field	Value
Publication number	US-2019316844-A1
Application number	US-201716466880-A
Country	US
Kind code	A1
Filing date	Dec 7, 2017
Priority date	Dec 8, 2016
Publication date	Oct 17, 2019
Grant date	—

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

1 : A method for handling a slag pot or ladle comprising an inner wall and an outer wall, said method comprising the steps of
a) collecting a slag in said slag pot or ladle of a pyro-metallurgical tool, b) transporting said slag pot or ladle from said pyro-metallurgical tool to a slag drop-off site, c) emptying of said pot or ladle at said slag drop off site in order to eliminate the slag that it contains, d) spraying of a mineral suspension onto said inner wall of said slag pot or ladle, prior to at least one step of said collecting of said slag, in such a way as to line said inner wall with a mineral layer, and e) putting into service of said slag pot or ladle lined with said mineral layer for the purpose of collecting slag as set out in step a), 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 in relation to the total weight of said mineral suspension.

2 : The method of claim 1 , wherein said mineral phase contains calcium particles, selected from the group consisting of slaked lime, decarbonated dolomite, at least partially slaked, lime and mixtures thereof.

3 : The method of claim 1 , wherein said mineral suspension contains a calcium particle slurry containing calcium particles between 20 and 60% by weight in relation to the weight of said calcium particle slurry.

4 : (canceled)

5 : The method of claim 2 , wherein said calcium particles in the calcium particle slurry of said aqueous phase have an average particle size d 50 between 1.5 μm and 1.0 μm.

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

7 : The method of claim 1 , wherein said carbon hydrate is selected from the group consisting of disaccharides including sucrose, and saccharose, sorbitol and mixtures thereof.

8 : The method of claim 1 , wherein said mineral suspension comprises one or several additives selected from the group consisting of dispersants, fluidising additives and mixtures thereof.

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

10 : The method of claim 2 , wherein said calcium particles of the calcium particle slurry have a particle size d 97 between 7 and 100 μm.

11 : The method of claim 4 , wherein said mineral suspension containing a calcium particle slurry is a lime slurry containing particles of slaked lime at a content between 20 and 60% by weight in relation to the 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.

12 - 14 : (canceled)

15 : 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, in relation to the total weight of said mineral suspension.

16 : The method of claim 15 , wherein said mineral layer has a layer thickness between 0.1 and 5 mm.

17 : The method of claim 15 , wherein said mineral suspension contains calcium particles, selected from the group consisting of slaked lime, decarbonated dolomite at least partially slaked, lime and mixtures thereof and wherein the mineral layer is a layer of calcium particles.

18 : The method of claim 15 , wherein said mineral suspension contains a calcium particle slurry containing calcium particles between 20 and 60% by weight in relation to the weight of said calcium particle slurry.

19 : (canceled)

20 : The method of claim 18 , 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.

21 : The method of claim 15 , wherein said carbon hydrate is selected from the group consisting of disaccharides, including sucrose and saccharose, sorbitol, monosacchandes, oligosarccharides, 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.

22 : The method of claim 15 , wherein said carbon hydrate is selected from the group consisting of sucrose, saccharose, sorbitol and mixtures thereof.

23 : The method of claim 18 , wherein said calcium particle slag slurry has a viscosity between 0.1 Pa·s and 2 Pa·s.

24 : The method of claim 18 , wherein said calcium particles of the calcium particle slurry have a particle size d 97 between 7 and 100 μm.

25 - 26 : (canceled)

27 : The method of claim 15 , wherein said mineral suspension comprises one or several additives selected from the group consisting of dispersants, fluidising additives and mixtures thereof.

28 - 45 : (canceled)

Assignees

• Lhoist Rech Et Developpement Sa

Inventors

• Denollin Guillaume

Classifications

• F27D1/1684 Primary

  by a special coating applied to the lining · CPC title

• C09D1/00 Primary

  Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances · CPC title

• F27D1/1678 Primary

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

• F27D1/1636

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

• C23C24/082

  without intermediate formation of a liquid in the layer · CPC title