CN105562184A - Method and equipment for improving grinding efficiency and classifying efficiency by rough grinding and rough classifying - Google Patents

Abstract

The invention discloses a method and equipment for improving grinding efficiency and classifying efficiency by rough grinding and rough classifying. The method aims to improve both grinding efficiency and classifying efficiency when ore grinding machines and an unequal-falling-particle cyclone which is classifying equipment form an integral unit to form a closed process. The equipment is structurally characterized in that two ends of a primary rod grinding machine are provided with an ore feeding port and an ore discharging port of the primary rod grinding machine respectively, the ore discharging port of the primary rod grinding machine is connected with an ore feeding port of the unequal-falling-particle cyclone, a sand settling mouth of the unequal-falling-particle cyclone is connected with an ore feeding port of a secondary ball grinding machine through a pipeline which is connected with a slurry pump, and an ore discharging port of the secondary ball grinding machine is connected with the ore feeding port of the unequal-falling-particle cyclone through the slurry pump. By the unequal-falling-particle cyclone and the ore grinding machines, qualified low target fineness and flotation feeding fineness can be obtained under high-granularity and high-fraction slurry conditions, and high ore grinding efficiency and classifying efficiency are realized, namely a win-win theory is realized.

Description

The rough segmentation of a kind of corase grind improves grinding efficiency and classification efficiency Apparatus and method for

Technical field

The present invention relates to the rough segmentation of a kind of corase grind and improve grinding efficiency and classification efficiency Apparatus and method for, particularly realize the method that ore mill and classifying equipoment cyclone efficiency improve jointly.Belong to grind grading technical field.

Technical background

Yunnan Linhua Group Corp., Ltd.'s patent of invention " a kind of method that can improve grinding efficiency and classification efficiency " its core technology of ore mill Granted publication on August 19th, 2015 has two inventive points: first inventive point is overflow fineness and is 50 (table 6 [0038]) to ore deposit fineness difference; Second inventive point is hydrocyclone structure parameter d n/dc, and pressure ratio in claiming, namely the ratio set of feed port and overflow pipe is between 0.7 ~ 0.8.Through production testing for many years, still there is certain defect, second inventive point problem is more outstanding, and the cyclone of Φ 350, Φ 500 that the said firm uses and Φ 660 3 kinds of specifications designs according to non-ferrous metal mineral design theory.Valuable mineral and the gangue mineral of non-ferrous metal mineral also exist difference in specific gravity.Such as cassiterite proportion is 6.9, gangue mineral quartz proportion 2.56, proportion difference 4.34.A famous theory is had to claim ratio of equilibrium settling velocity in gravity treatment theory, according to ratio of equilibrium settling velocity concept, 74 μm of quartz have identical terminal velocity degree with 38 μm of cassiterites, so be classified as a grade 74 ~ 38 μm to carry out classification, and cyclone using particle size as classification point, in order to reclaim heavy target minreal, have to 74 ~ 38 μm of grade width design cyclone running parameters to meet both needs.So all specification cyclones that non-ferrous metal mineral use all to can be described as etc. and fall having etc. of phenomenon and fall cyclone.Certainly, to have etc. and fall phenomenon cyclone and be applied in mid-low grade collophanite ore and fall in phenomenon mineral without difference in specific gravity, nothing etc. and do not meet objective law, show as overflow and run thick, sand setting and press from both sides thin phenomenon, an ore grinding hour amount still may improve but unconsummated defect.

Summary of the invention

Object of the present invention is intended to the defect overcoming background technology, provides a kind of and roughly grinds the method that rough segmentation improves grinding efficiency and classification efficiency.

Completing device structure that the object of the invention adopts is: first paragraph rod milling ore mill (2a) one end is to ore deposit entrance (1), first paragraph rod milling ore mill (2a) other end is ore discharge outlet (3a), the feed port that ore discharge outlet (3a) of first paragraph rod milling ore mill (2a) falls cyclone (6) by the first Pulp pump (4) and nothing etc. is connected, without etc. cyclone (6) fall and sand settling mouth (8) being connected to ore deposit entrance by the second Pulp pump (9) and pipeline and second segment ball milling ore mill (2b), cyclone (6) fall in second segment ball milling ore mill (2b) ore discharge again with nothing etc. feed port (5) after sending into the first Pulp pump (4) by ball mill outlet (3b) is connected.

Concrete grammar is: according to flotation to ore deposit B point fineness requirement, such as flotation to ore deposit B point fineness or without etc. cyclone B point overflow fineness 85 ~ 90%-200 order (lower with) falls, this fineness is deducted 45 ~ 56% or title 45 ~ 56, obtain the outlet of first paragraph rod mill ore discharge (3a) mog and second segment ball mill ore discharging export (3b) mog merge after nothing etc. fineness-200 order % of cyclone (6) feed port (5) A point falls, i.e. 85-56=29%, 95-56=39%.In other words, without etc. fall cyclone overflow fineness deduct without etc. cyclone falls to the difference of ore deposit fineness, B-A=overflow fineness appreciate, appreciation scope is 45 ~ 56 (45 ~ 56%-200 orders).

It is have difference in specific gravity from non-ferrous metal mineral and gangue mineral that cyclone design theory falls in described nothing etc., phenomenon falls in existence etc., the innovative point that ratio of equilibrium settling velocity theory causes, because mid-low grade collophanite ore thing stone and gangue mineral almost do not have difference in specific gravity, not exist etc. and fall phenomenon, ratio of equilibrium settling velocity, without the impact of proportion factor, to have etc. that to fall cyclone be with a grade width, such as 74 ~ 38 μm of grades, the long measure of a line segment designs in other words, without etc. cyclone falls then with particle size, such as 74 μm of particle size, a point carries out cyclone design exactly, " point " and " line segment " design concept have theoretic difference, those feed port sizes, overflow pipe size, their ratio relations each other of sand settling mouth size no longer become inventive point, the substitute is the contour stealth existed in cyclone and convert that segment length unit of inward eddy to, i.e. sand setting product and overflow separation of products and so-called separation cone long measure.Same specification cyclone such as Φ 500mm cyclone, to have etc. and falls cyclone separation cone length 215mm, and without etc. to fall cyclone be 180 ~ 186mm.

Ore mill of the present invention without etc. fall cyclone unit with the mog that ore mill is thick allow without etc. cyclone falls under coarse size and the wide slurry conditions of grade, obtain thinner qualified object fineness, flotation to ore deposit fineness, realize ore grinding and the two high object of classification efficiency, be called that doulbe-sides' victory is theoretical.

Accompanying drawing explanation

Fig. 1 is ore mill of the present invention, the closed circuit flow chart of cyclone.

Fig. 2 is that hydrocyclone grind grading ore pulp flow chart (151.75t/h) falls in the corase grind rough segmentation+have etc. that background of invention technology describes.

Cyclone ore pulp flow chart falls in Fig. 3 the technology of the present invention corase grind rough segmentation+nothing etc.

Number in the figure: 1-is to ore deposit entrance; 2a-first paragraph rod milling ore mill; 2b-second segment ball milling ore mill; The ore discharge outlet of 3a-first paragraph ore mill; 3b-second segment ore mill ore discharge exports; 4-first Pulp pump; 5-without etc. cyclone feed port falls; 6-without etc. cyclone falls; 7-overflow pipe; 8-sand setting is chewed; 9-second Pulp pump; The outer comb of 10-overflow; After A-mono-section of secondary grinding machine merges, mog, nothing etc. fall cyclone to ore deposit; B-without etc. cyclone overflow is fallen.

Specific implementation method

Below in conjunction with accompanying drawing, the present invention is further illustrated, but be not limited to embodiment.

The present invention without etc. to fall cyclone design theory be have difference in specific gravity existence etc. to fall phenomenon from Non-ferrous minerals and gangue mineral, the innovative point that ratio of equilibrium settling velocity theory causes.Because mid-low grade collophanite ore rock phosphate in powder and gangue mineral almost do not have difference in specific gravity, not exist etc. and fall phenomenon, ratio of equilibrium settling velocity, without the impact of proportion factor, to have etc. that to fall cyclone be with a grade width, such as 74 ~ 38 μm of grades, the long measure of a line segment designs in other words, without etc. cyclone falls then with particle size, such as 74 μm of particle size, a point carries out cyclone design exactly, " point " and " line segment " design concept have theoretic difference, those feed port sizes, overflow pipe size, their ratio relations each other of sand settling mouth size no longer become inventive point, the substitute is the contour stealth existed in cyclone and convert that segment length unit of inward eddy to, i.e. sand setting product and overflow separation of products and so-called separation cone long measure.Same specification cyclone such as Φ 500mm cyclone, to have etc. and falls cyclone separation cone length 215mm, and without etc. to fall cyclone be 180 ~ 186mm.

Embodiment (Fig. 3 is shown in technological process)

Corase grind rough segmentation of the present invention improves the method for grinding efficiency and classification efficiency, realizing the device structure that the object of the invention adopts is: one end of one section of rod milling 2a ore mill is for ore deposit entrance 1, the other end is primary grinding machine ore discharge outlet 3a, the feed port 5 that primary grinding machine ore discharge outlet 3a falls cyclone by Pulp pump 4 and nothing etc. is connected, without etc. cyclone 6 falls and sand settling mouth 8 being connected to ore deposit entrance by pipeline and two sections of ball milling 2b ore mills, pipeline is connected with Pulp pump 9, the feed port 5 that secondary grinding machine ore discharge outlet 3b falls cyclone by Pulp pump 4 and nothing etc. is connected, concrete grammar is: one end of one section of rod milling ore mill is to ore deposit entrance, the other end is the outlet of primary grinding machine ore discharge, the feed port that the outlet of primary grinding machine ore discharge falls cyclone by Pulp pump and nothing etc. is connected, without etc. cyclone falls and sand settling mouth being connected to ore deposit entrance by pipeline and two sections of ball milling ore mills, pipeline is connected with Pulp pump, the feed port that the outlet of secondary grinding machine ore discharge falls cyclone by Pulp pump and nothing etc. is connected, concrete grammar is:

A. the overflow fineness (flotation is to ore deposit object fineness) nothing etc. being fallen cyclone B point reduces by 45 ~ 56 (45 ~ 56%-200 orders), namely obtain one section and secondary grinding machine merge after the mog of A point, be also that nothing etc. is fallen cyclone to be called that overflow fineness appreciates to ore deposit fineness B point and A point fineness difference be 45 ~ 56;

B. ore mill is milled to the ore pulp of mog through step a setting, through Pulp pump from feed port be driven into without etc. fall cyclone and carry out classification, feed force is 0.06 ~ 0.14MPa, and ore pulp concentration expressed in percentage by weight is 50 ~ 60%;

C. flotation is reached to the overflow product of ore deposit fineness, through without etc. fall cyclone overflow pipe from overflow outer tube and discharge, for the purpose of product, what do not reach fineness is sand setting or sand return, discharge from sand settling mouth, the feed port returning two sections of ball milling ore mills by Pulp pump carries out repetition ore grinding, and the feed port that the outlet of secondary grinding machine ore discharge falls cyclone by Pulp pump and nothing etc. is connected.

Claims (3)

1. roughly grind the equipment that rough segmentation improves grinding efficiency and classification efficiency for one kind, it is characterized in that, equipment employing structure is: first paragraph rod milling ore mill (2a) one end is to ore deposit entrance (1), first paragraph rod milling ore mill (2a) other end is ore discharge outlet (3a), the feed port that ore discharge outlet (3a) of first paragraph rod milling ore mill (2a) falls cyclone (6) by the first Pulp pump (4) and nothing etc. is connected, without etc. cyclone (6) fall and sand settling mouth (8) being connected to ore deposit entrance by the second Pulp pump (9) and pipeline and second segment ball milling ore mill (2b), cyclone (6) fall in second segment ball milling ore mill (2b) ore discharge again with nothing etc. feed port (5) after sending into the first Pulp pump (4) by ball mill outlet (3b) is connected.

2. roughly grind the method that rough segmentation improves grinding efficiency and classification efficiency for one kind, it is characterized in that, concrete steps are: the overflow fineness (flotation is to ore deposit object fineness) that cyclone B point falls in nothing etc. is reduced by 45 ~ 56 (45 ~ 56%-200 orders) by a., namely obtain one section and secondary grinding machine merge after the mog of A point, be also that nothing etc. is fallen cyclone to be called that overflow fineness appreciates to ore deposit fineness B point and A point fineness difference be 45 ~ 56;

B. two stage grinding machine is milled to the ore pulp of mog through step a setting, through Pulp pump from feed port be driven into without etc. fall cyclone and carry out classification, feed force is 0.06 ~ 0.14MPa, and ore pulp concentration expressed in percentage by weight is 50 ~ 60%;

C. flotation is reached to the overflow product of ore deposit fineness, through without etc. fall cyclone overflow pipe from overflow outer tube and discharge, for the purpose of product, what do not reach fineness is sand setting or sand return, discharge from sand settling mouth, the feed port returning two sections of ball milling ore mills by Pulp pump carries out repetition ore grinding, and the feed port that the outlet of secondary grinding machine ore discharge falls cyclone by Pulp pump and nothing etc. is connected.

3. corase grind rough segmentation according to claim 2 improves the method for grinding efficiency and classification efficiency, it is characterized in that, cyclone diameter specification Ф 250 ~ Ф 660mm falls in the nothing etc. described in step b.