Add a portion of fish meal and five minutes of water. Stir well and let it stand for five minutes. If foreign matter is found floating on the surface of the water. It is mixed with wheat bran, rice husk powder, peanut husk powder and so on, dipped in supernatant with finger, dripped on the tip of tongue, can judge the salt content, and then rinsed repeatedly with water, the remaining sediment can be judged as mixed with shell powder and so on.
Fire, fish meal spread on a piece of iron plate, the lower part of the barbecue with fire, fish meal if mixed with feather powder and other animal feed, burning after the smell of burning, if the smell of dry-fried Cereals paste, is mixed with plant feed, if the litmus test paper fumigated in smoke, red for animal feed, blue shows mixed. More plant feed.
The normal bulk density of fish meal is 0.62 tons per cubic meter (620 kg). If the bulk density exceeds this value, it may be high water content or salt content or mixed with mud, sand and shellfish powder. If the bulk density is lower than this value, it may be mixed with wheat bran, rice husk powder, peanut husk powder and so on.
After boiling, the fish protein condenses, a lot of water and grease run out, the cooked fish is sent to the tube with holes to extrude, mixed with oil and water fish juice will be extruded, and the remaining caked fish from the back of the compressor. Fish juice mixed with oil and water is separated by oil and water to produce fish oil and fish water. Fish water will be returned to the machine through the pipeline and added to the caked fish meat for drying to make the whole fish meal. Fish meal drying can be divided into two ways: direct fire drying and indirect drying. Direct fire drying has a great influence on the quality of fish meal. Now it is used to dry fish meal indirectly or in vacuum at low temperature.
Bubbles: add 5 parts of water to 1 portion of fish meal, stir well, and place for 5 minutes. If foreign bodies are found floating on the water surface, they are mixed with wheat bran, rice husk powder, peanut shell powder, etc. The supernatant can be extracted by finger and dripped on the tip of tongue to determine the salt content. Then rinse with water repeatedly, and the remaining sediments can be judged as mixed with wheat bran, rice husk powder and peanut shell powder. Gravel or shell powder, etc.