SU1629100A1 - Method of wet grinding of ores and materials - Google Patents

Abstract

The invention relates to the wet grinding of ores and various materials of the metallurgical cycle, such as slags, mattes, mattes, and can be used in the mining industry to prepare raw materials for subsequent separation, such as flotation. The goal of the invention is to increase the productivity of the grinding process optimal distribution of the comminuted material in stages. The process includes stage-by-stage comminution and classification, adjustment of the process to a given capacity and size of comminution. in each stage, the ratio of the grinding volumes of the first and second stages is chosen from 4.0 1.0 to 1.0 5.0, and the grinding size in the first stage is determined from the mathematical dependence (R0 / R2) (Vi /), where Ro is the content of the design class of fineness more than d in the original pro,%, R, R2 is the content of the design class of particle size more than d in the grinding product after the first and second stage,%, 1 / |, K is the reduced volumes of the first and second grinding stages, m m is the parameter of the equation, and the parameter of the equation of m is found from the kinematic curve of grindability this material 3 tabl (L

Description

The invention relates to the wet fine grinding of ores and various materials of metallurgical cycp, such as slags, mattes, mattes, and can be used in the mining industry to prepare the raw material for subsequent separation, for example, flotation.

The purpose of the invention is to increase the productivity of the grinding process due to the optimal distribution of the material to be ground in stages.

According to the method, the ratio of the grinding volumes of the first and second stages, for example, from 4.0 to 1.0 to 105.0, and the grinding size in the first stage is determined from the mathematical dependence

st /

L (RolRi) (

where Ro is the content of the calculated class of fineness of the botoe d in the original pro, only,%,

R, R is the maintenance of a calculated class of fineness more than d in the grinding product after the first and second stages,%

V, V2 are the reduced volumes of the first and second grinding stages, m, t is the equation parameter, and the equation parameter is found from the kinematic grinding curve of this material.

For grinding ores and materials with the highest productivity, the grinding stage is adjusted to the size of grinding at which the

Yu

CD

m mills volumes are used most fully.

The equation parameter (the same parameter of the V.Tovarovova grinding kinematics equation) for each specific material is determined by the kinematic grindability curve, for example, using the least squares method.

When grinding copper nickel finesteine under laboratory conditions, the results are given in Table. one.

In this case, the parameters of the equation takes the value of 1.03, and the equation itself has the form:

p.93.6

 (g e / KsM / v + i) -1-03

The choice of the range of change in the ratio of the grinding volumes in stages is due to the fact that outside this range, the amount of change in the grain size of the material in the first stage becomes comparable with the analysis error, i.e., the method loses sensitivity. Let us show this by the example of copper-nickel matte (Table 2).

Therefore, the value of the range of ratios of the volumes of the first and second stages is selected in the range from 4.0: 1.0 to 1.0: 5.0.

The method is implemented as follows.

The ratio of the grinding volumes of the first and second stages within the specified range is chosen from 4.0: 1.0 to 1.0: 5.0. Testing is carried out to study the kinetics of grinding of this type of material and, based on the results obtained, the parameter t is calculated. Then, the size of grinding of material in the first stage is determined from the dependence

1 (Ro / R2) (V2 / V, + l) -m

Example. For the copper-nickel matte, according to a known method, the size of the material grinding in the first stage with the ratio of the volumes of the first and second stages is 1.0: 1.8 and / (0.8 is 64.3%

0

class more than 0,045 mm. When implementing the proposed method, the ratio of the grinding volumes of the first and second stages is changed to 1.0: 0.9, while the required grain size in the first stage is 36.4% of a class greater than 0.045 mm. The results of comparative tests of the known and proposed methods are given in table. 3

The data show that the proposed method, compared with the known, allows to increase the specific productivity of the mills by 31.6%:

0.599-0,455

Claims (1)

Invention Formula 6. The method of wet grinding of ores and materials, including stepwise grinding and classification, adjustment of the process to a given capacity and grinding size in each stage, characterized in that, in order to increase the productivity of the grinding process due to the optimal distribution of the crushed material in stages, the ratio of the grinding volumes of the first and second stages is chosen from 4.0: 1 , 0 to 1.0: 5.0, and the grinding size in the first stage is determined from the mathematical dependence n (R0 / R2) (V2 / Vl + rm where Ro is the content of the design class of fineness more than a in the initial product TR ° / those 7o Ri, RZ - the content of the calculated size class is more than a in the grinding product after the first and second stages,%; V, 1/2 is the volume of the first and second stages of grinding, m3; m is the parameter of the equation moreover, the parameters of the equation m are found on the kinematic curve of the grindability of this material. Grinding time, min ten 20 Class content more than 0.045 mm,% 93.6 81.9 71.5 54.5 31.5 Table 1 40 80 120 210 18.2 5.2 Table 2 Table 3