Combine salmon, rice, bread crumbs, onion, dill, capers, horseradish and lemon juice. Mix well. Add eggs and mayonnaise. Season with salt and pepper. Place flour in a shallow bowl, season with salt, pepper and paprika. Form salmon into 8-10 patties. Coat in flour mixture. Saute patties in a bit of butter about 5 minutes per side. Serve plain or like a hamburger.