CN-122006858-A - Ceramic steel ball double-medium vertical mill for fine grinding of 325-mesh-size iron ore

Abstract

The invention relates to the technical field of mineral processing engineering, in particular to a ceramic steel ball double-medium vertical mill for finely grinding 325-mesh iron ore, which comprises a base, a cylindrical grinding cavity, a spiral stirring shaft, a driving device, spiral blades, a double-medium system, a ball blocking grate and a gathering ore ring, wherein the ball blocking grate is arranged on the inner wall of a grinding cavity ore discharge port and is positioned at the middle upper part of the grinding cavity and is used for dividing the grinding cavity into a ceramic ball main distribution area at the upper part and a steel ball main distribution area at the lower part, the ball blocking grate is arranged at the upper part of the grinding cavity and is positioned below the ball blocking grate, the inner diameter of the ball blocking grate is gradually reduced from top to bottom to form a tapered flow guide surface, a sinking flow channel is formed between the spiral blades and the inner wall of the grinding cavity, and a hole allowing ore pulp and fine particles to pass through is formed in the central area of the spiral stirring shaft.

Inventors

• HU FOMING
• WANG CHUANLONG
• WU HAOJUN
• MA MENGYI
• ZHANG JING
• JIANG HONG
• Pan Fachun
• WU CAIBIN
• SHEN YUANHAI
• HU CHENG
• LI ZHONGWEN
• WU GUOJUN
• JIN TING
• SUN YULIN
• WANG WENXIANG

Assignees

• 安徽马钢矿业资源集团南山矿业有限公司

Dates

Publication Date

20260512

Application Date

20260226

Claims (10)

1. 1. A ceramic steel ball double-medium vertical mill for finely grinding 325-mesh iron ore is characterized by comprising the following steps: A base; the cylindrical grinding cavity is arranged on the base, the bottom of the grinding cavity is provided with an ore feeding port, and the top of the grinding cavity is provided with an ore discharging port; The spiral stirring shaft is vertically and coaxially arranged in the grinding cavity; The driving device is connected with the top end of the spiral stirring shaft and is used for driving the spiral stirring shaft to rotate around the axis of the spiral stirring shaft; the spiral blade is fixedly sleeved on the spiral stirring shaft; the double-medium system comprises a steel ball and a ceramic ball which are loaded in the grinding cavity; the ball blocking grate is arranged on the inner wall of the ore discharge opening of the grinding cavity and positioned at the middle upper part of the grinding cavity and is used for dividing the grinding cavity into an upper ceramic ball main distribution area and a lower steel ball main distribution area; the gathering ring is arranged at the upper part of the grinding cavity and positioned below the ball blocking grate, and the inner diameter of the gathering ring gradually decreases from top to bottom to form a conical guide surface; The spiral blade and the inner wall of the grinding cavity form a lifting flow passage, the central area of the spiral stirring shaft forms a sinking flow passage, and the ball blocking grate is provided with holes allowing ore pulp and fine particles to pass through.
2. 2. The ceramic steel ball double-medium vertical mill for finely grinding 325-mesh iron ore, according to claim 1, wherein the ball blocking grate is of an annular plate-shaped structure, and the plate surface of the ball blocking grate is obliquely arranged relative to the horizontal plane.
3. 3. The ceramic steel ball double-medium vertical mill for finely grinding 325-mesh iron ore according to claim 2, wherein the aperture ratio of the ball blocking grate is 25-40%, and the aperture diameter of the aperture is 3-8 mm.
4. 4. The ceramic steel ball double-medium vertical mill for finely grinding 325-mesh iron ore according to claim 1, wherein the cone angle of the conical flow guide surface of the gathering ring is 15-30 degrees.
5. 5. The ceramic steel ball double-medium vertical mill for finely grinding 325-mesh iron ore according to claim 1, wherein the mass ratio of the steel balls to the ceramic balls is 1:2 to 1:4, and the diameter of the ceramic balls is smaller than the diameter of the steel balls.
6. 6. The ceramic steel ball double-medium vertical mill for finely grinding 325-mesh iron ore, according to claim 5, wherein the ceramic balls are alumina ceramic balls or zirconia toughened alumina ceramic balls.
7. 7. The ceramic steel ball double-medium vertical mill for finely grinding 325-mesh iron ore according to claim 1, wherein the spiral blade is of a variable pitch structure, and the pitch of the spiral blade is gradually increased from the top to the bottom of the milling cavity.
8. 8. The ceramic steel ball double-medium vertical mill for finely grinding 325-mesh iron ore according to claim 1, wherein the driving device comprises a driving shaft, a driving base and a coupling, and the driving shaft is connected with the top end of the spiral stirring shaft through the coupling.
9. 9. The ceramic steel ball double-medium vertical mill for finely grinding 325-mesh iron ore according to claim 1, wherein the top of the milling cavity is provided with an ore discharge cavity communicated with the ore discharge port.
10. 10. A ceramic steel ball double-medium vertical mill for finely grinding 325 mesh grade iron ore according to any one of claims 1-9, wherein the upper region of the gathering ring constitutes a fine grinding zone and the lower region constitutes an impact crushing zone.

Description

Ceramic steel ball double-medium vertical mill for fine grinding of 325-mesh-size iron ore Technical Field The invention relates to the technical field of mineral processing engineering, in particular to a ceramic steel ball double-medium vertical mill for finely grinding 325-mesh iron ore. Background In the iron ore dressing process, fine grinding is a key link for improving the grade of ore concentrate and the metal recovery rate, particularly grinding the ore to 325 meshes and finer, currently, commonly adopted fine grinding equipment comprises a ball mill, a vertical stirring mill and the like, most of the equipment uses single grinding media such as steel balls or ceramic balls, the density of the steel balls is high, the impact force is strong, mineral particles are easy to be excessively crushed in the fine grinding stage, iron pollution is generated when the steel balls are worn, the quality of the final ore concentrate is influenced, the ceramic balls are high in hardness, small in wear and pollution-free, the density is lower, the impact force is weak, and the problems of insufficient fine grinding efficiency and high energy consumption exist when the ceramic balls are singly used for iron ore with higher hardness. In order to improve the grinding efficiency, attempts of using two media in a grinding machine at the same time, such as steel balls and ceramic balls, are made in the prior art, however, the attempts are often simply physical mixing, lack of medium distribution and flow field design of a system, and obvious defects are exposed in actual operation, namely firstly, the media with different densities are easy to segregate or delaminate (such as steel balls sinking and ceramic balls floating up) under the stirring action, so that the media are unevenly distributed and cannot form a stable collaborative grinding area, secondly, the flow path of ore pulp in a grinding cavity is random, the residence time of coarse particles and fine particles is difficult to effectively distinguish, coarse particles are easy to grind and fine particles are overground, the product granularity distribution is wide, the yield of target size is low, and secondly, the matching property of the media and the ore pulp flow field is poor, the energy utilization rate is low, the energy consumption is high, and the medium loss is large. Therefore, aiming at the problems of low efficiency, high energy consumption and uneven product granularity existing in grinding equipment in the prior art by using single medium or simple double-medium grinding, the ceramic steel ball double-medium vertical mill for finely grinding 325-mesh iron ore is provided. Disclosure of Invention In order to solve the problems of low efficiency, high energy consumption and uneven product granularity existing in grinding equipment in the prior art by using single medium or simple double-medium grinding. The technical scheme of the invention is that the ceramic steel ball double-medium vertical mill for finely grinding 325-mesh iron ore comprises the following components: A base; the cylindrical grinding cavity is arranged on the base, the bottom of the grinding cavity is provided with an ore feeding port, and the top of the grinding cavity is provided with an ore discharging port; The spiral stirring shaft is vertically and coaxially arranged in the grinding cavity; The driving device is connected with the top end of the spiral stirring shaft and is used for driving the spiral stirring shaft to rotate around the axis of the spiral stirring shaft; the spiral blade is fixedly sleeved on the spiral stirring shaft; the double-medium system comprises a steel ball and a ceramic ball which are loaded in the grinding cavity; the ball blocking grate is arranged on the inner wall of the ore discharge opening of the grinding cavity and positioned at the middle upper part of the grinding cavity and is used for dividing the grinding cavity into an upper ceramic ball main distribution area and a lower steel ball main distribution area; the gathering ring is arranged at the upper part of the grinding cavity and positioned below the ball blocking grate, and the inner diameter of the gathering ring gradually decreases from top to bottom to form a conical guide surface; The spiral blade and the inner wall of the grinding cavity form a lifting flow passage, the central area of the spiral stirring shaft forms a sinking flow passage, and the ball blocking grate is provided with holes allowing ore pulp and fine particles to pass through. Preferably, ore pulp enters an impact crushing area at the lower part of the grinding cavity from an ore feeding port, steel balls impact and crush the ore strongly under the drive of a spiral blade, meanwhile, an elevating flow passage formed between the spiral blade and a grinding wall conveys the ore pulp containing coarse particles upwards, when the ore pulp rises to a ball blocking grate, fine particle ore pulp enters a sinking fl