Development of single molybdenum ore beneficiation process (2)

(2) molybdenum processing plant in our selection process molybdenum processing plant in our selection process, whether it is plant design fifties, sixties design or construction, as well as the seventies or early eighties design build The factory uses a relatively single “one-time re-grinding multiple concentrate process”. This process is influenced by the selection process of Yangjiazhangzi Molybdenum Plant (referred to as Yang Mine). The selected process flow chart before the reform of the plant is shown in the figure below.

Compared with the Americas, the disadvantages of its selected process flow are:
1) The coarse concentrate is generally not buffered and concentrated, and directly enters the selected operation. When the rough selection operation changes, it directly affects the selection.
2) Generally choose a re-grinding process for multiple refineries, pay attention to the number of selected operations, and neglect the role of re-grinding, molybdenum ore failed to achieve sufficient monomer separation. According to the results of several inspections of the selected process in Yang Mine, the volume of each selected operation is large, especially the one or four selections are more prominent. Sometimes the circulation is as high as 20 times that of the original ore, forming a fine Choose the "flatness" of the job. The identification of the rock and minerals proves that the circulating products are mainly particles and continuous organisms. [next]
3) does not attach importance to select and then grinding media, multi-media metal.
4) The selected process has a small rich ore ratio, the concentrate grade is not high, about 45% (Mo), and the selected recovery rate is low, 95 to 96%.
It is particularly noteworthy that in production management, the management of selected regrind operations is generally neglected, and only the regrind operation is performed, regardless of the regrind efficiency, the grinding concentration and fineness are not measured, and even more, in order to “manage Convenient, "simplified process", even stopped or cut off the only one re-grinding operation.
(3) New progress in the selection process of molybdenum selection in China Since the 1980s, with the implementation of China's opening up policy, China's molybdenum concentrate products have entered the international market. In order to meet the needs of product quality competition, the molybdenum selection plants such as Yangjiazhangzi and Jinduicheng have done a lot of work on the selection process and made certain progress.
1) Yangjiazhangzi Molybdenum Plant will reform the selection of “a section of re-grinding, two-stage and eight-time selection process” into “two-stage re-grinding, two-stage eight-time selection process” reformed into “two-stage re-grinding” , two-stage eight-time selection process, that is, the coarse concentrate is re-grinded, and a three-stage selected concentrate is carried out. After the second section is re-grinded, the second section is selected four to eight times to improve the concentrate grade. And select recycling rates. The process of reforming and refining crude concentrates and strengthening the two-stage re-grinding is underway.
2) According to the requirements of the international market for the quality standard of molybdenum concentrate products, and the quality of molybdenum concentrate products, the refining of the selected process will be changed to two-stage re-grinding (see below). Fig.), the grade of -0.025 mm in the concentrate product increased from 74.2% to 87.2%, and the grade of molybdenum concentrate increased from 51.61% to 54.27%, corresponding to the reduction of impurities, see the table below.

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