Hongxing Rotary Kiln Can Process Zinc Leach Residue

Since the reduced iron has the advantages of high purity and coke is not needed in the production process, many countries are carrying out the production and research of direct reduced iron. The world reduced iron production has accounted for a large proportion of the total iron. The rotary kiln way is one of the production processes. However, the knot kiln affects its development. Since the 1950s, China began the research of the rotary kiln. The rotary kiln with different specifications has been built nearly, but the rotary kilns were not put into operation due to the abnormal operation of the knot kiln equipment. Henan Hongxing Mining Machinery uses the kiln new technology, namely head coal injection, which not only solves the pending kiln problem, but also has the advantages of good quality, low coal consumption, low cost, simple structure and easy and reliable operation.
The experts of Henan Hongxing Mining Machinery have systematically researched the coal injection gun when they carried out the technology research. In the direct reduction technology research of the rotary kiln, Henan Hongxing Mining Machinery used the traditional process at first. As a result, the pelletizing are effloresced, which makes the production can not be continued. Such pellets must use the high-temperature reduction process to prevent the efflorescence of the pellets. The traditional technology can not meet the high temperature requirements. Henan Hongxing Mining Machinery begins to consider using new technology of kiln head coal injection for the test. 
The semi-industrial tests are described as the followings. The pellets are added to the rotary kiln from the kiln layer. The mixture of the reduced coal and the desulfurization agent enter the kiln through the coal injection gun. At this time, the coal injection distance, secondary air ratio and other process conditions must be regulated. In this way, the pellets begin the reduction process after they are heated up to 900 ℃ in the neutral or oxidizing atmosphere. The pellet moves forward and the temperature of the kiln gradually increases. The reducing atmosphere gradually enhances to speed up the restore process. The materials discharged by the rotary are separated by the magnetic separator to produce the magnetic material and the non-magnetic material.
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