I feel Geo's method of incineration may work here, (if your just burning some dry paper) but I would not call it incineration, but maybe I would call it burning with lighter fluid.
Geo gives good advice but I wish he would not call this method incineration, as incineration is a different process.
Be careful with lighter fluid or cans of gas that fire can burn back to the can in your hand, or you may burn up more than what you wanted to.
I can pour lighter fluid in the palm of my hand and light it, (with my thick skin of my hands, I would hardly feel the heat as the lighter fume's evaporated off of my hand and burned in the air above my palm, with the fluid burned away so fast my hand would not even get burned.
Many things that need incineration need prolonged heat, getting everything (carbon based), that will burn consumed and converted to CO2 gas.
Powders (salts of metals), (any metal dissolved in an acid, becomes a salt of that metal and acid).
We will also need prolonged high temperatures to convert the salt back into the metal oxide, of that metal, this heat drives off these as fumes of the acid we used to make the salt.
Example: say you dissolved tin in HCl with some gold, and then added nitric (dissolving gold and tin together) and formed some aqua regia, but the tin and gold and chlorides made a purple of cassius powder (tin chloride reduced gold),(same as stannous test reaction does), and I wanted my gold back from this mess, I would incinerate these powders, heating these metal chloride salts, to separate chloride (as gas) from the gold and tin salts or powders (this would take prolonged heating) (not just rising vapors of volatile lighter fluid burning fast off the surface), these salts once heated high enough long enough will change from being a salt of metal, back into the elemental metal, I still want to heat them longer till red hot until they no longer put off smoke or gases, this red glowing heated metal is crushed and exposed to air, this will oxidize the metal (making it easier to go into solution later), (in our case here tin will oxidize, so the HCl wash later will NOT make a gel (making it hard to separate gold from tin) and HCl will dissolve the tin-oxide easier).
(For some salts like sulfates made from metals dissolved with sulfuric you may have to heat 30 minutes to more than an hour to drive off all of the SO2 as gas and convert metal these salts into metal oxides).
Tin in HCl does not dissolve very well at all, and it makes a gel that gives trouble filtering, and it will also trap your gold in this gel, the incineration process converts the tin to tin oxide, so that HCl will dissolve this oxide of tin much better so you can wash tin from your gold (without washing away gold with it).
Many times we use incineration when changing acids (removing acidd salt previosly used.
When you dissolve a metal (or even wash a metal) in an acid you have the salt of previous acid, like when you make a chloride salt, (incineration drives off (chloride as gas) from the salt of the metal, changing it back into metal, or metal oxide.
Without incineration you have these chloride salts and when you add nitric on the metal (chloride) you will make some aqua regia, (from mixing metal chloride salt and nitric which would dissolve some or all of your gold), and then you have gold dissolved in the metal, (you were trying to wash away without dissolving the gold).
Incineration should be done with high heat.
For sulfates temperatures of greater than 700 degrees are needed, and these temperature's must be held for a long enough time to remove the SO2 gases, it could take an hour for these temperature to drive off all gases. Then heating these powders red hot in air to oxidize metals, these temperatures will usually take heat from a gas burner, torch,fire from coals, or electric burner with a torch, or other very high heat source.
Non-magnetic stainless steel, or white corning ware type casserole dish is what i would choose to incinerate in. depending materials what I was doing also would depend which one of these I chose.
Another thing to consider gold chloride salts (or even gold mixed with table salt) heating these you can evaporate off vaporizing the gold in yellow fumes (similar with silver chloride salts vaporizing in the white fumes).
To prevent this I will neutralize my Gold (or silver) chloride salts with sodium hydroxide, water and stirring well, this will take the gold chloride salt, and make sodium chloride (NaCl table salt) this Table salt water is easily washed out with several hot water washes, this prevents losses of values in fumes when I incenerate.
Another point some salts will need low heating to begin with (to dry), otherwise splashing and bursting gas bubbles will throw values all over the place, and then once these powders are dry, the heat can be raised (usually best to start crushing back to powder before completely dry, and continue to crush till well dried), now many times after you raise heat to high, on the dry metal salts, they will become wet again and form a thick syrup of fused metal salts, they will start fuming off acidic gases, keeping the heat high (but not bubbling and splashing), these acidic gases will escape and these metal powders will then dry again, we crush to powders again now we can bring these powders to red hot to oxidize these metal powders stirring the red hot powders well to get good exposure to air.
Inceneration sounds simple, it is, but this tool is one of the best tools in your tool box if used properly, it is very important if you want fine gold, keeps you from gold lose when changing acids, and is especially important when dealing with electronic waste with the tin involved.