PURIFICATION OF METALLIC OBJECTS IN THE PRESENCE OF A LIQUID AND LAYER SILICATE(S)

Abstract

This invention is related to a process for purification of metallic objects comprising an oil-adsorbing step in the presence of a liquid and a layer silicate component.

Claims

1. Process for purification of metallic objects comprising an oil-adsorbing step in the presence of a liquid and a layer silicate component.

2. Process according to claim 1 wherein the liquid comprises water.

3. Process according to claim 1 wherein the layer silicate component comprises montmorillonite.

4. Process according to claim 1 wherein the process is performed in the absence of surfactants.

5. Process according to claim 1 wherein the process is performed at a pH of from 4 to 10.6.

6. Process according to claim 1 wherein the process is performed at a temperature of from 10° C. to 50° C.

7. Process according to claim 1 wherein the process is performed in soak or barrel equipment, rotary drum washing equipment, sprinkler equipment and/or spray equipment.

8. Process according to claim 1 further comprising an abrasive step utilizing an abrasive material, wherein both steps are performed separately or simultaneously.

9. Process according to claim 8 wherein the supernatant liquid of the oil-adsorbing step is partially transferred to the abrasive step.

10. Process according to claim 1 wherein the process comprises one or more subsequent washing step(s).

11. Process according to claim 10 wherein the slurry is at least partially transferred to the oil-adsorbing step.

12. Process according to claim 8, wherein the abrasive material comprises aluminium oxide.

13. Process according to claim 12, wherein the layer silicate component and the abrasive material comprise aluminium oxide.

14. Process according to claim 1, wherein the layer silicate component comprises silicon dioxide and aluminum dioxide, wherein in the layer silicate component the silicon dioxide and the aluminum dioxide amount together to 85 wt.-% or more, based on the total weight of the layer silicate component.

15. Process according to claim 8, wherein (1)—the layer silicate component has a total amount ranging from 10 wt.-% to 40 wt.-%, based on the combined total weight of the liquid, the layer silicate component, and the abrasive material (2)—the abrasive material has a total amount ranging from 0.5 wt.-% to 15 wt.-%, based on the combined total weight of the liquid, the layer silicate component, and the abrasive material, or both (1) and (2).

16. Process for purification of metallic objects comprising an oil-adsorbing step in the presence of a liquid and a layer silicate component, wherein the process is performed in the absence of surfactants, and the layer silicate component and the liquid have a ratio of from 0.05:1 to 0.6:1, each based on weight.

17. Process according to claim 1 further comprising an abrasive step utilizing an abrasive material, wherein both steps are performed simultaneously.

18. Process according to claim 8, wherein the abrasive material is provided in a slurry.

19. Process according to claim 18, wherein the slurry comprises at least partly the liquid utilized in the oil-adsorbing step.

20. Process for purification of metallic objects comprising (i) an oil-adsorbing step in the presence of a liquid and a layer silicate component, and (ii) an abrasive step utilizing an abrasive material, wherein both steps are performed simultaneously, the process is performed in the absence of surfactants, and the abrasive material is provided in a slurry, wherein the slurry comprises at least partly the liquid utilized in the oil-adsorbing step.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0138] FIG. 1 demonstrates the effect as described in Example 1

[0139] FIG. 2 shows an example for an embodiment of the inventive process

[0140] (1): mixture of liquid/layer silicate component

[0141] (2): loading (for metallic objects)

[0142] (3): Rotary drum washing equipment

[0143] (4): removal (of metallic objects)

[0144] (5): agitation (here: air bubbling)

[0145] (6): sprayer (for abrasive step)

[0146] (7): transfer line for mixture of liquid/layer silicate component to sprayer (6)

[0147] FIG. 3 shows an example for the embodiment of the inventive process according to FIG. 1 with subsequent washing steps

EXAMPLE

Example 1: Oil Adsorption Capacity

[0148] According to the following table, mixtures of 5 g clay (W05-25 Sibelco), 20 g water and different amounts of oil (15W-40 motor oil) were prepared (samples 1a to 1e). The lid was closed and then the mixture was thoroughly shaken manually for 10 minutes. The mixture was allowed to settle. Pictures were taken. These can be found in FIG. 1. In all cases only one liquid phase was yielded.

TABLE-US-00001 Relative Number of amount of liquid Sample Clay Water Oil oil:clay phases 1a 5 g 20 g   0 g  0% 1 1b 5 g 20 g 1.25 g 25% 1 1c 5 g 20 g 2.50 g 50% 1 1d 5 g 20 g 3.75 g 75% 1 1e 5 g 20 g 5.00 g 100%  1