Solids Passivation
The invention pertains to a method of passivating direct process solids ( 1 ) and to passivated and quenched compositions resulting from said method. The method of passivating direct process solids ( 1 ) according to the invention comprises combining direct process solids ( 1 ) with a passivating composition comprising clay ( 2 ), base ( 3 ), and water ( 4 ). The passivated composition of the invention comprises direct process solids ( 1 ) and a passivating composition comprising clay ( 2 ), base ( 3 ), and water ( 4 ). The quenched composition of the invention comprises the passivated composition, wherein the passivated composition has been held for a sufficient period of time for the reactive species from the direct process solids to be substantially quenched and/or oxidized.
1 . A method of forming a passivated composition, comprising:
combining direct process solids and a passivating composition comprising a clay, water, and a base, wherein at least 0.1 equivalents of base per 100 grams of direct process solids and 15 to 40% (w/w) water are combined and wherein the direct process solids comprise mainly silicon metal and silicone oxides and comprise a minor amount of polysilanes.
2 . canceled
3 . The method of claim 1 wherein the clay is selected from Fuller's earth, bentonite, kaolin, or diatomite.
4 . The method of claim 3 wherein the clay is bentonite.
5 . The method of claim 1 wherein the clay and the direct process solids are combined in a ratio and of the clay to the direct process solids of ≧0.01:1.
6 . The method of claim 5 wherein the ratio of the clay to the direct process solids is from 2:1 to 0.01:1.
7 . The method of claim 1 wherein the water is from 15 weight % to 35 weight %.
8 . The method of claim 1 wherein the base is alkali oxide, alkali hydroxide, alkali earth oxide, alkali earth hydroxide, ammonium hydroxide, alkali silicates, alkali earth silicates, alkali borates, or alkali earth borates.
9 . The method of claim 8 wherein the base is lime.
10 . The method of claim 9 wherein the lime is combined as an aqueous slurry.
11 . A passivated composition comprising the product produced by the method of claim 1 .
12 - 16 . (canceled)
17 . A method of forming a quenched composition, comprising:
forming a passivated composition according to the process of claim 1 , and holding the passivated composition until the direct process solids are substantially quenched.
18 . A quenched composition comprising the product formed by the process of claim
17 .
19 . canceled