Saeedanwar,
I'm with Rick. By your description, it's hard to tell exactly what you did do, but, if Rick's right, what you did will never work. Sounds like you alloyed 22K or 18K down to 16.5K with silver. That is about the worst thing you could have done, because it put the metal percentages in a position where nothing will dissolve them. The alloy you ended up with is now so high in silver that a crust of silver chloride, AgCl, coats the pieces and that prevents the penetration of the aqua regia and stops the dissolving. To dissolve karat gold directly in AR, the silver content is limited to 8% and maybe as much as 9 or 10%, if the karat gold pieces are real thin.
At those silver limits, the dissolving will slow down and you might have to remove the AgCl crust a time or two to speed things up. There are several ways to do that. You might remove the pieces, rinse them well (especially when using a metal mortar and pestle) and then grind the crust off in a mortar and pestle. A more guaranteed method is to rinse them well and then dissolve the AgCl in a warm solution of either ammonia, sodium thiosulfate (hypo), or sodium or potassium cyanide. The hypo is the safest but the silver is harder to recover from it. The cyanide is quite poisonous and, if all the acid hasn't been rinsed off of the pieces, an extremely poisonous gas (HCN) is released. Most people use dilute ammonia, but the dissolved silver can create an explosive compound if the solution is allowed to sit around for awhile. To prevent this, acidify the solution with HCl, immediately after use. The AgCl will reform and is easily collected.
One of the pleasures of refining is to learn how to avoid the constant dangers you are exposed to. :!:
To avoid the silver problem, a method called "inquartation" is used. The gold content is reduced to 25% (=one quarter - thus the name, inquartation) by melting with added silver or copper. The melted alloy is then poured slowly into a container filled with clean cold water large enough so the water is at least 35cm deep. This puts the metal into small thin pieces with a high surface area that are faster to dissolve. All of the base metals and silver are then dissolved with 50/50 nitric acid, diluted with pure water, leaving the gold, which doesn't dissolve, behind as a powder. The gold powder is well-rinsed, dissolved in a minimum amount of aqua regia, and the gold is precipitated as normal. To determine whether to inquart with silver or copper, it takes about 3.4 times as much nitric to dissolve a gram of copper than to dissolve a gram of silver. If you use silver, it is easily recovered as a powder and reused simply by putting copper bars in the silver solution. I have used both, but I feel that using silver simplifies the process somewhat, mainly because there's less acid to deal with.
To finish up what you have started, I would alloy enough silver with your undissolved metal to reduce the gold content to at least 6K (25% gold). Make sure the molten metals are well blended before pouring into water (called "shotting"). Don't go much below 6K because, when dissolving the metals in 50/50 nitric, the gold powder can get so fine that it is a purple colloid and will hardly ever settle. They have found unsettled colloidal gold in Egyptian tombs. Sometimes you can break the colloid by heating the solution.
As Rick said, download and read the Hoke book.
