Donganshan Iron Ore Concentrator (3)

(3) Major technical improvements since the plant was put into production:
1) Reduce the size of the discharge port of the coarse crusher and reduce the size of the coarse crushing ore; the medium crusher is replaced with the rolled wall liner of the fine crusher to increase the content of fine ore grade less than 12mm in the ore discharge; change the fine crusher The geometry of the lining at the discharge port and the size of the parallel belt gap are adjusted so that the ore content of less than 12mm in the ore discharge reaches 85% or more. The comparison of production indicators before the transformation (1976) and after the transformation (1984) is shown in the following table:

2) Flotation concentrate is less than 99% of the grain size of 0.053mm, and the viscosity of the slurry is large due to the influence of the fatty acid collector . The dewatering of the concentrate is difficult. After the production, the concentration operation is changed to a two-stage concentration operation. improve the working conditions and the effects of dehydration, reducing the metal loss. The particle size composition of the product in the dehydration operation is shown in the following table:

3) Achieving a high equipment operating rate by strengthening the planning management of maintenance work, improving the materials of some wearing parts, and improving the degree of mechanization of maintenance. The fine operation rate has reached more than 80% since 1970, and the grinding operation rate is more than 90.02% from 1982 to 1985, and the filtration operation rate is 94.03%.

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