Composition of matter for the conversion of biochar into low surface area graphite
The present disclosure relates to composition of matter for a feedstock suitable for graphitization. In particular, the present disclosure relates to composition required for taking non-graphitizable carbon materials and producing a graphite product with preferred properties.
1. A composition of matter comprising a mixture of a biochar, iron oxide, and an additive formation, wherein the mixture on a dry wt/wt basis comprises (a) iron oxide of between about 9.5 to about 80 percent by weight, (b) the additive formulation of between about 0.001 and about 5 percent by weight and (c) a biochar of between about 20 to about 90.5 percent by weight, wherein the biochar has a fixed carbon content of about 70%; and wherein the additive formulation is selected form one or more of the following: a surfactant, a binder, a dispersant, a rheology modifier, a wetting agent, an anti-foaming agent, and any combination thereof.
2. The composition as claimed in claim 1 , wherein the mixture (dry wt/wt basis) comprises (a) iron oxide of between about 19 to about 67 percent by weight, (b) the additive formulation of between about 0.001 and about 5 percent by weight and (c) a biochar of between about 33 to about 81 percent by weight, wherein the biochar has a fixed carbon content of at least 70%.
3. The composition as claimed in claim 1 , wherein the biochar in the mixture is in particulate form.
4. The composition as claimed in claim 3 , wherein the initial particulate sizes of the biochar are less than about 50 millimeters.
5. The composition as claimed in claim 1 , wherein the iron oxide in the mixture is in particulate form.
6. The composition as claimed in claim 1 , wherein the iron oxide and biochar are both in particulate form.
7. The composition as claimed in claim 1 , wherein the initial particulate sizes of the iron oxide are less than about 5 millimeters.
8. The composition as claimed in claim 6 , wherein the initial particulate sizes of the biochar are less than about 50 millimeters and the initial particulate sizes of the iron oxide are less than about 5 millimeters.
9. The composition as claimed in claim 5 , wherein the particulate sizes of the biochar are less than about 800 microns.
10. The composition as claimed in claim 1 , wherein the composition further includes a liquid, the liquid being chosen to ensure that when the composition is in use there is minimal solubility of the iron oxide in the liquid.
11. The composition as claimed in claim 10 wherein the liquid is water.
12. The composition as claimed in claim 1 , wherein the additive formulation comprises two or more of a surfactant, a binder, a dispersant, a rheology modifier, a wetting agent, an anti-foaming agent and any combination thereof.
13. The composition as claimed in claim 12 , wherein the additive formulation comprises one or more additives selected from one or more of: acResin®, ACRODUR®, ACROFLOR®, ACRONAL®, AEROSOL C-61, AG 6202, ALCOSPERSE 175, ALMIPAL P, Amidex®, Aminoethyl Ethanolamine, Ammonium Fluoride, AMMONYX M, AQACell®, Aquatreat BW30, Arkopal, Armac®, Armeen®, Armid O, Attagel®, Aziridine, BASONAT® polyisocyanates, Bronidox, BTBAB-90, BTBAC-50, Bteac-50, BTMAC-50, BTMAH-40, BUTOFAN® styrene-butadiene binders, BUTONAL® styrene-butadiene binders, Butyl Stearate, Calcium Stearate, Darvan®, Dispex®, Dodecandioic acid, DYSPERSE®, EDAPLAN®, EFKA®, ENORDET, Ethoduomeen T/25, EURAMAAT, EUR-AMID, EURANAAT, EURASOL, EUROGLYC, EUROQUAT, EUROWET, EUROXIDE, EXOdis PC30, FOAMASTER MO 2133, FOAMSTAR®, Heliogen Blue D 7079, HYDROPALAT®, JONCRYL®, Lauryl Alcohol, Lipal MSC, Lipal NTD, Magna Surf®, MERPOL SE, METOLAT®, NANSA, Oleamid, Oleic acid, Pasatell M-182 (2-798), PEG-400, Pentaerythritol Oleate, POIZ 520, POIZ 530, Polyamides, Polyesters, POLYFON H, Polyglycols, Polyman®, Polymerizable Additives, Potassium Soyate, Quickpearl PK3, REAX®, REWOCID DU185 SE, Rewopol SB L 203, Rheovis®, ROKAmer 1010/50, Schercomid®, SDS, Sibet®, Sico 50BC, Sidos 70, Sodium dodecyl benzene sulphonate, Sodium N-hexadecanoyl-L-alaninate, Sodium silicate, Sorbitan Mono Oleate, Sorbitan Monopalmitate, Steamcare B12, Stearyl Chloride, STYROFAN®, SugaDet APG-10, Sulfoccinate LSS, Sulfochem®, Sulphated Butyl Oleate, Sunnol®, SURFACARE O ACID, TBAH-40, TBAHS-50, Tensol® DDM, TERGITOL®, TLMAC-30, TMAC-100 ARQUAD 41-100, Tomamine Amphoteric 12, Triethanolamine, Triethylbenzylammonium Chloride, TWEEN 80, UFACID K, Vitec®, YB-0100, YB-150, YB-191, YB-2000, YB-904, YBASD-200, and any combination thereof.
14. A method of heat treating the composition as defined in claim 1 , to a temperature above the reduction temperature of the iron oxide, thereby reducing it to an elemental metal or an alloy.
15. The method as claimed in claim 14 , wherein the heat treatment results in the conversion of amorphous biochar into crystalline graphite.
16. The method as claimed in claim 14 , wherein the conversion of amorphous char to crystalline graphite formed by the heat treatment of the mixture is greater than about 50%.
17. The method as claimed in claim 14 , wherein the degree of crystallinity of the crystalline graphite formed by the heat treatment of the mixture is greater than about 90%.
18. The method as claimed in claim 14 , wherein the specific surface area of the graphite formed by the heat treatment of the composition of matter defined above is less than about 50 m 2 /g.
19. A method of producing a composition as claimed in claim 1 , the method including the steps of:
i) thermally treating biomass in particulate form at a temperature of between about 200 and about 1000 degrees Celsius under inert conditions to form a particulate biochar using either dry pyrolysis or hydrothermal treatment;
ii) milling the biochar to obtain a particle size of less than about 800 microns;
iii) milling iron oxide to obtain a particle size of less than about 100 microns:
iv) combining the resulting biochar with the iron oxide, a liquid and an additive formulation; and
v) heating the mixture to between about 400 and about 3000 degrees Celsius under inert conditions to create graphitic carbon.
20. The method as claimed in claim 19 , wherein the biomass is selected from:
a. forestry residue,
b. sawdust,
c. lignocellulosic biomass or a lignin derivative, and
d. woodchip or any other wood-based material.
21. The method as claimed in claim 19 , wherein the liquid is water.
22. The method as claimed in claim 19 , wherein the liquid and iron oxide are chosen to ensure that when in use there is minimal solubility of the metallic compound in the liquid.
23. The method as claimed in claim 19 , wherein in step iv) the iron oxide is combined with either
a. the biochar by wet blending together in a mixer with an additive formulation or
b. the biochar by wet milling together in a mill with an additive formulation.
24. The method as claimed in claim 19 , wherein the additive formulation for the mixed slurry includes two or more of: a surfactant, a binder, a dispersant, a rheology modifier, a wetting agent, an anti-foaming agent and any combination thereof.
25. The method as claimed in claim 19 , wherein in step iv) a particulate slurry in water is formed by combining the iron oxide in water with an additive formulation using a mixer to produce a particulate iron oxide compound slurry.
26. The method as claimed in claim 19 , wherein in step iv) a particulate slurry in water is formed by combining the biochar in water with additive formulation using a mixer to produce a particulate biochar slurry.
27. The method as claimed in claim 25 , wherein the additive formulation is selected from: a binder, a dispersant, a rheology modifier, a wetting agent, an anti-foaming agent and any combination thereof.
28. The method as claimed in claim 26 , wherein the particulate slurry is combined with the particulate biochar slurry and then blended together in a mixer.