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Ball grinder accurate ball loading method

A technology of precise ball filling and ball milling, applied in grain processing, etc., can solve the problems of large errors and inconvenience, and achieve the effect of improving concentrate grade, reducing power consumption, and accurate ball diameter

Inactive Publication Date: 2004-11-17
KUNMING UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is inconvenient to use these two empirical ball diameter formulas to calculate the ball diameter of the mill in my country's mineral processing plant, and the second is that the error is still relatively large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1. A copper-nickel concentrator in Yunnan, with a scale of 300 tons per day, used two grid-type ball mills with a diameter×length of 1.5×3.0 meters to conduct one-stage grinding in two series. The filling of balls in production is unreasonable, and the diameter of the balls is too large, resulting in insufficient fineness of grinding products, low sorting index, and high ball consumption. Carry out precise installation and replacement of balls in the mill of this factory, the specific procedure is as follows:

[0040] (1) Measure the uniaxial compressive strength of ore standard mechanical test piece σ=502.9kg / cm with the lump ore sample of the plant 2 , the compressive strength σ of the irregular ore block 0 =206.1kg / cm 2 , ore elastic modulus 7.36×10 5 kg / cm 2 , Poisson's ratio 0.341. The mechanical properties of the ore show that the ore is a soft ore (f=5.03), which has certain toughness and deformability. When grinding this kind of ore, both impact and...

Embodiment 2

[0060] Embodiment 2. A copper beneficiation plant in Yunnan, with a scale of 3000 tons per day, adopts two large ball mills with a diameter × length of 3.6 × 4.5 meters in parallel for one-stage grinding. The filling of balls in the production is unreasonable, and the diameter of the balls is seriously too large, resulting in low mill capacity, low grinding fineness, and low sorting index. For this purpose, the factory organizes to meet production and standard problems, and adopts the method of precise loading and filling balls to improve the grinding effect. The specific procedures are as follows:

[0061] (1) Determine the mechanical properties of the ore for the ore in the plant: the uniaxial compressive strength of the standard mechanical test piece σ = 871.775kg / cm 2 , the compressive strength σ of the irregular ore block 0 =398.75kg / cm 2 , Poisson's ratio μ=0.28. The mechanical properties of the ore show that the ore is a medium-hard ore (f=8.7), with moderate brittle...

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Abstract

The invention is a method for ball mill to recuperate balls precisely, which belongs to ore pulverizing, grinding technology field. The method includes: measures the mechanical parameter of ore; sifts and analyzes the mill ore and back sands, calculates the ore particle components and groups them; calculates the particle radius value according to ball radius haft theory formula; determines the ball ratio of the mill according to the ore particle and the needed ball radius; paints the ball particle accumulating curve, thus acquires the radius and recuperating ratio precisely. The proportion is reasonable, the method is simple, the productivity is upgraded greatly, and the quality is improved.

Description

[0001] 1. Technical field: ore crushing and grinding technical field 2. Background technology [0002] The grinding process of the ball mill is one of the most complicated operations in the mineral processing plant. There are many variable influencing factors and are intricate, making it difficult to solve many problems in the grinding process. The determination of the ball diameter is difficult to be precise, and the existing ball diameter formulas are all empirical formulas, and the error of the calculated ball diameter is large. There is no good way for the proportioning of various size balls. Therefore, it is difficult to achieve precision in both the single-level ball diameter and the average diameter of the overall ball load in the mill, and it is also difficult to obtain a good grinding effect. [0003] Mineral dressing circles both at home and abroad attach great importance to the research on the method of loading balls in ball mills. A lot of research has been done ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C17/00
Inventor 段希祥周平赵高举王春
Owner KUNMING UNIV OF SCI & TECH
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