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Method for determining rod diameter of rod mill

A technology of rod mill and rod diameter, which is applied in the field of fine grinding and ore crushing, can solve problems such as inappropriateness, and achieve the effect of heavy workload and simple and convenient determination method

Inactive Publication Date: 2011-09-07
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above two empirical formulas are not suitable for our country to calculate the rod diameter

Method used

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  • Method for determining rod diameter of rod mill
  • Method for determining rod diameter of rod mill

Examples

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Embodiment Construction

[0042] Examples are carried out according to the steps described in the Summary of the Invention. details as follows:

[0043] The ore processed by the No. 2 Alumina Plant of Chalco Henan Branch is bauxite, and the rough mill is D×L3.6×5.0m rod mill, the rotation rate ψ=65%, the filling rate Ore specific gravity 2.95g / cm 3 , pulp concentration C = 75%. Calculate the maximum rod diameter under this grinding condition.

[0044] ① The measured uniaxial compressive strength of the ore σ = 1028.89kg / cm 2 , elastic modulus E=5.268×10 5 kg / cm 2 , Poisson's ratio μ = 0.225, for medium-hard, brittle ore.

[0045] ②Sieve the feed ore of the rod mill for particle size analysis, and calculate the maximum particle size d′ for 95% of the sieve f 40mm, the average particle size

[0046]③Convert the actual working conditions of the rod mill to the calculated D×L3.6×5.0m ball mill, the rotation rate ψ=65%, the filling rate Ore specific gravity 2.95g / cm 3 , σ 压 =1028.89kg / cm 2 ,...

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Abstract

The invention relates to a method for determining the rod diameter of a rod mill, belonging to the field of ore grinding and levigating technology. The method provided by the invention comprises the following concrete steps: (1) measuring the uniaxial compressive strength alpha of the ore to be milled, as a mechanical basis for determining the accurate rod diameter; (2) performing screen analysis of particle size for the feeding material of the rod mill, and determining the fraction d'f and average particle size for ensuring the screening rate of 95%; (3) converting the practical working conditions of the rod mill into the working conditions of a ball mill in the same conditions, and calculating the ball diameter in the conditions by using a half-theory formula of ball size (C.G.S system); (4) correcting the calculated ball diameter according to the breaking experience and ore milling characteristics of the steel rod, and calculating the required rod diameter through the formula D(R-opt)=(0.48-0.5)D'b; and (5) performing ore milling contrast test with the rod diameter greater than and less than D(R-opt), and determining the accurate rod diameter of the rod mill according to the ore milling result. Compared with the prior art, the method is simple and convenient, is accurate in calculation result, has low labor intensity of workers and shortens the test period.

Description

Technical field: [0001] The invention relates to a method for determining the rod diameter of a rod mill, which belongs to the technical field of ore crushing and grinding. Background technique: [0002] The rod diameter is an important factor affecting the grinding of the rod mill. If the diameter of the rod is too large, the energy of a single rod when it falls back will exceed the crushing work required by the hit rock block, resulting in a large amount of excess energy, resulting in waste of energy consumption or broken rods. If the diameter of the rod is too small, the quality of the single rod and the mechanical energy it has when it falls back are small, and the crushing work required by the ground rock block cannot be reached to break the rock block. At the same time, the existence of coarse blocks that cannot be ground will change the spatial position relationship of the grinding rods from parallel to oblique, and the line contact relationship between the grinding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C23/00
Inventor 罗春梅肖庆飞段希祥高洪林张艮林
Owner YUNNAN UNIV
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