阅读说明：本技术 一种降低沉砂夹细比值提高磨矿分级产能的方法 (Method for reducing fine ratio of sand setting to mineral grinding and grading capacity ) 是由 李耀基 刘朝竹 李海兵 宋慧林 李侯超 董伟 陈双贵 张晖 宗世荣 方世祥 赵建 于 2020-04-08 设计创作，主要内容包括：本发明涉及一种降低沉砂夹细比θ<Sub>0</Sub>值提高磨矿分级产能的方法,属磨矿分级技术领域,当磨矿机与旋流器两种设备构成有机统一体,形成磨矿分级工艺流程时,传统方法解决的是溢流细度β值。本发明解决的是以降低沉砂夹细比θ<Sub>0</Sub>值,并以此来提高磨矿分级产能和降电耗。当θ<Sub>0</Sub>＝23.74％时,溢流浓度、细度不降反升,产能提高28.30％。本发明具体是由磨矿机与水力旋流器两种设备构成的第一段全闭路的两段磨矿分级工艺流程,和第一段开路的两段磨矿分级工艺流程中,所述提高磨矿分级产能链条为：二段Φ500mm水力旋流器分离锥上B点<Image he="56" wi="112" file="DDA0002442757830000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>值控制→沉砂夹细比θ<Sub>0</Sub>值控制→二段磨矿分级负荷(Q<Sub>2</Sub>)控制→一段磨矿分级产能Q值。(The invention relates to a method for reducing the fineness ratio theta of sand setting clamp 0 A method for increasing the classifying productivity of ore mill features that when the ore mill and cyclone are integrated to form an ore mill classifying technological route, the overflow fineness is β, and the fineness ratio of sand is decreased 0 The method can improve the ore grinding grading capacity and reduce the power consumption. When theta is 0 When the concentration of overflow is 23.74%, the concentration and fineness of overflow are not decreased and inversely increased, and the productivity is increased by 28.30%. The invention specifically relates to a first-section fully-closed two-section ore grinding grading process flow consisting of an ore grinding machine and a hydrocyclone, and a first-section open two-section ore grinding grading process flow, wherein the chain for improving the ore grinding grading capacity is as follows: point B on two-section phi 500mm hydrocyclone separation cone Value control → fineness ratio of sand setting & lttheta & gt 0 Value control → two-stage grinding classification load (Q) 2 ) Control → Q value of graded productivity of one stage of grinding.)

1. To reduce the fineness ratio theta of sand setting clamp₀The method for improving the ore grinding grading capacity is characterized by comprising the following steps: in the first-section fully-closed two-section ore grinding grading process flow and the first-section open two-section ore grinding grading process flow, which are formed by an ore grinding machine and a hydrocyclone, the chain for improving the ore grinding grading capacity is as follows:

2. the method according to claim 1, characterized in that the sand settling and overflow product of the hydrocyclone are subjected to a classification stage h₁Graded centrifugal force intensity A pointAn acceleration of gravity; a sand setting and overflow product separation section h of the hydrocyclone₂Separating the centrifugal force intensity B pointAn acceleration of gravity; point BIs point A6.05 to 6.50 times of the total weight of the powder.

3. A method according to claim 1 or 2, characterised in that the grit inclusion ratio θ in the hydrocyclone is such that₀Value of theta₀＝23.74～16.52％。

4. The method of claim 1, wherein the grit inclusion ratio θ in said hydrocyclone₀The ore amount of several tons to 200 meshes in the settled sand product is reduced, the new capacity of one ton can be increased, and the conversion ratio is as follows:

4.1 the conversion ratio of the low-grade collophanite is as follows: 1.512: 1;

4.2 the exchange ratio of the copper oxide ore is as follows: 2.64: 1;

4.3 conversion ratio of bauxite is: 2.45: 1.

5. the method of claim 1, wherein the hydrocyclone separation cone has a centrifugal force strength at point BThe equation of (a) is calculated as: point B

In the formula K_D-a hydrocyclone diameter correction factor;

K_α-a cone angle correction factor for the hydrocyclone;

dn-equivalent diameter of ore feeding pipe, cm;

dc-diameter of overflow pipe, cm;

p is ore feeding pressure, MPa;

constant-5875.69.

6. The method of claim 1, wherein the overflow concentration in the hydrocyclone is increased without decreasing or increasing, respectively:

6.1, 3.01 percent and 2.3 percent of middle-low grade collophanite;

6.2, 1 percent and 3.5 percent of copper oxide ore;

6.3 bauxite 0.61% and 6.71%.

7. The method as claimed in claim 1, wherein the hydrocyclone cylinder diameter D is chosen from the range of 466 mm to 500 mm.

Technical Field

The invention relates to the technical field of a cyclone ore grinding and grading process.

Background

1. One of the background art

The hydrocyclone can be used alone for the classification operation of the grinding circuit in a dressing plant.

D hydroclone calculation example (mineral separation design Manual P)₁₆₄)

Grading with hydrocyclones in ball milling circuits

The ore feeding amount is 250t/h

The overflow concentration is 40%

The overflow particle size is required to be less than 74 μm (-200 mesh, the same below) and the fraction accounts for 60%

The ore density is 2.9t/m³

The working gauge pressure at the inlet of the cyclone is 55kPa

The circulating load of the ore grinding loop is 225 percent

And selecting the specification of the hydrocyclones according to the conditions, and calculating the required number.

a material balance calculation in grinding circuit

The results of the material balance calculation in the grinding circuit are shown in Table 1

TABLE 1 results of material balance calculations

The skilled person draws a pulp flow chart of the grinding and grading process of figure 1 according to the table.

b calculating d_50(c)

The overflow particle size is required to be less than 74 μm and the particle size fraction accounts for 60%, and the table look-up 2 shows that:

d_50(c)＝2.08/d_T＝2.08×74＝154μm

TABLE 2 hydrocyclone overflow particle size and d₅₀Relationship (manual P)₁₆₃)

c calculating the swirler diameter D

As is clear from Table 2, the feed weight concentration of the cyclone was 59.1% and the volume concentration thereof was 33.2%, which are expressed by the following formula (handbook P)₁₆₃)

Then there are:

so as to obtain the product with the advantages of,

the specification diameter D of the cyclone is 50cm, the diameter dc of the overflow pipe is 17cm, the equivalent diameter dn of the ore feeding opening is 13cm, and the taper α is 20 DEG

d, calculating the cyclone processing capacity V:

(coefficient of diameter))

(coefficient of taper angle))

Disclosure of Invention

The invention aims to solve the problem of the fineness ratio theta of the settled sand in the prior art₀The problem that the ore grinding grading capacity channel is seriously blocked due to high value is solved, and the method for reducing the settling sand clamp fineness ratio theta of the system is established₀A new method for improving the actual ore grinding grading capacity in a numerical mode.

The invention aims to reduce the fineness ratio theta of sand setting₀The method for improving the ore grinding grading capacity by value comprises the following steps: in the first-section fully-closed two-section ore grinding grading process flow and the first-section open two-section ore grinding grading process flow, which are formed by an ore grinding machine and a hydrocyclone, the chain for improving the ore grinding grading capacity is as follows: point B on two-section phi 500mm hydrocyclone separation coneValue control → fineness ratio of sand setting & lttheta & gt₀Value control → two-stage grinding classification load (Q)₂) Control → Q value of graded productivity of one stage of grinding. The settling sand and overflow product generation component stage h of the hydrocyclone₁Graded centrifugal force intensity A pointAn acceleration of gravity; a sand setting and overflow product separation section h of the hydrocyclone₂Separating the centrifugal force intensity B pointAn acceleration of gravity; point BIs point A6.05 to 6.50 times of the total weight of the powder.

A grit inclusion fineness ratio theta in the hydrocyclone₀Value of theta₀＝23.74～16.52％。

A grit inclusion fineness ratio theta in the hydrocyclone₀The ore amount of several tons to 200 meshes in the settled sand product is reduced, the new capacity of one ton can be increased, and the conversion ratio is as follows:

4.1 the conversion ratio of the low-grade collophanite is as follows: 1.512: 1;

4.2 the exchange ratio of the copper oxide ore is as follows: 2.64: 1;

4.3 conversion ratio of bauxite is: 2.45: 1.

centrifugal force intensity B point of hydrocyclone separation coneThe equation of (a) is calculated as: point B

In the formula K_D-a hydrocyclone diameter correction factor;

K_α-a cone angle correction factor for the hydrocyclone;

dn-equivalent diameter of ore feeding pipe, cm;

dc-diameter of overflow pipe, cm;

p is ore feeding pressure, MPa;

constant-5875.69.

The overflow concentration fineness in the hydrocyclone is not reduced and reversely increased, and the overflow concentration fineness is respectively increased:

6.1, 3.01 percent and 2.3 percent of middle-low grade collophanite;

6.2, 1 percent and 3.5 percent of copper oxide ore;

6.3 bauxite 0.61% and 6.71%.

The diameter D of the selected hydrocyclone cylinder is phi 466-phi 500 mm.

The invention reduces (controls) the fineness ratio theta of the settled sand at the front end of the production line system₀The numerical method is used for indirectly improving the actual ore grinding and grading capacity of the rearmost end of the production line system, the capacity of each ore grinding and grading is improved under the condition that the equipment of the original production line system is unchanged, the traditional theory and practical operation that the finer the overflow fineness β value is, the better the value is are changed, the change of an actual control point is brought by theoretical innovation, and the separation cone of the two-section phi 500mm hydrocyclone is controlledPoint B ofValue → fineness ratio of sand setting theta₀Value control → two-stage grinding classification load (Q)₂) Control → finally obtaining the Q value (capacity) of the graded productivity of the first stage ore grinding.

The specific mechanism of operation (see fig. 5 and 10) is: when the ore pulp with pressure enters the hydrocyclone, the ore pulp rotates around the axis of the hydrocyclone, and the ore particle groups are distributed in the container according to the granularity, the density, the shape and the concentration of the ore particle groups under the combined action of various pressures. The density of the pulp increases from the hydrocyclone axis in the direction of the vessel wall and from the overflow pipe B in the direction of the sand deposition nozzle 8, following the basic principle that the hydrocyclone appears to form a constant density surface and a constant particle size surface. These surfaces are conical with a greater cone angle than the swirler itself. Furthermore, the density and particle size of the slurry vary from height to height, with a lower cone section thickening zone and an upper cone section dilution zone. On a small section of conical section above the sand setting nozzle, the outer rotational flow is divided into two ore slurry flows which are sprayed out from the sand setting nozzle, transferred into the inner rotational flow and discharged to the overflow pipe. The particle size of the former is coarse and coarse, and the concentration is thicker; the latter has fine, fine and thinner granularity and thinner concentration.

drawings

FIG. 1 shows a process flow of ore grinding classification in the prior art design manual.

FIG. 2 shows a process flow (conventional method) for grinding and grading Kunyang ore.

Fig. 3 shows a process flow of ore grinding and classification of kunyang ore (first generation of research and development center).

Fig. 4 shows a process flow of ore grinding and classification of kunyang ore (second generation of research and development center).

Fig. 5 shows a process flow of ore grinding and classification of kunyang ore (third generation of research and development center, the present invention).

FIG. 6 shows a conventional grinding and classification process of Dahongshan copper ore (example 2).

FIG. 7 shows the third generation grinding classification process of the Dahongshan copper ore (example 2).

FIG. 8 is a flow chart of a conventional two-stage one-closed circuit grinding classification pulp process in Guangxi Pingguo aluminum plant (example 3).

FIG. 9 is a flow chart of a fourth generation two-stage one-pass grinding classification pulp process in Guangxi Ping aluminum plant (example 3).

FIG. 10 is a schematic view of the structure of the present invention using a cyclone.

The reference numbers in the figures: 1-an overflow pipe; 2-internal overflow pipe; 3, feeding slurry; 4-a cylinder body; 5-overflow column; 6-column of air; 7-cone; 8-a sand setting nozzle; h is₁Generating a grading cone by sand setting and overflowing; h is₂Separating cone for separating settled sand from overflow.

Detailed Description

The present invention has three embodiments, which will be further detailed and compared with the description of the present invention, and these descriptions are only exemplary and not intended to limit the application scope of the present invention. In addition, in the following description, the drawings showing the operation of the cyclone are provided, and the known structural parameters and descriptions are omitted so as to avoid unnecessarily obscuring the concept of the present invention.