CN-122006870-A - High-efficiency energy-saving grinding equipment and method for composite force field of high-hardness raw materials

CN122006870ACN 122006870 ACN122006870 ACN 122006870ACN-122006870-A

Abstract

The invention discloses a high-efficiency energy-saving grinding device and a high-efficiency energy-saving grinding method for a high-hardness raw material, which belong to the technical field of building materials and nonmetallic mineral powder grinding, wherein a device main body is of a vertical structure and sequentially comprises a pre-crushing part, a vortex shearing part, a fine grinding stripping part and a fine grinding and stripping part, wherein the pre-crushing part is provided with a high-speed rotating impact device for carrying out primary crushing with impact force as a main factor on a fed bulk raw material, the vortex shearing part is provided with a rotatable grinding disc and a fixed lining plate, the working surface of the grinding disc and the working surface of the lining plate are curved surfaces matched with each other and are used for forming a strong vortex shearing force field when grinding the materials, and the fine grinding and stripping part is provided with a cavity filled with microsphere mediums and a stirring mechanism for stirring the microsphere mediums and is used for carrying out fine grinding with grinding stripping force as a main factor on a falling material. The invention realizes the efficient and energy-saving grinding work of the composite force field for the high-hardness raw materials based on the composite force field of impact, shearing and grinding.

Inventors

DU XIN
TANG SHIHAO
ZHANG RUIZHI
MA CONGYU
LV KEXIN
LIU BIN
FAN BO

Assignees

天津水泥工业设计研究院有限公司
中建材(天津)工业服务有限公司

Dates

Publication Date: 20260512
Application Date: 20260212

Claims (10)

1. A compound force field high-efficiency energy-saving grinding device for high-hardness raw materials is characterized in that a device main body is of a vertical structure, and sequentially comprises: The pre-crushing part is provided with a high-speed rotating impact device and is used for performing primary crushing with impact force as a main factor on the fed block raw materials; the vortex shearing part is provided with a rotatable millstone and a fixed lining plate, and the working surface of the millstone and the working surface of the lining plate are mutually matched curved surfaces and are used for forming a strong vortex shearing force field when rolling materials; The fine grinding and peeling part is provided with a cavity filled with microsphere mediums and a stirring mechanism for stirring the microsphere mediums and is used for carrying out fine grinding on falling materials with the grinding and peeling force as the dominant.
2. The composite force field efficient energy-saving grinding equipment for high-hardness raw materials according to claim 1, wherein the impact device comprises a main shaft driven by an independent motor and a plurality of impact hammerheads arranged on the main shaft, and annular impact lining plates are arranged on the periphery of the impact hammerheads.
3. The efficient and energy-saving grinding equipment for the composite force field of the high-hardness raw materials is characterized in that the working surface of the grinding roller is a composite curved surface with a concave middle part and convex two ends, the working surface of the grinding disc lining plate is provided with a spiral line or a logarithmic spiral groove radiating from the center to the edge, and the working surface of the grinding disc is meshed with the logarithmic spiral groove to form a material vortex channel.
4. The composite force field high-efficiency energy-saving grinding equipment for high-hardness raw materials according to claim 1, wherein the microsphere medium is a high-hardness wear-resistant ball with a diameter of 3-15 mm.
5. The composite force field efficient energy-saving grinding equipment for high-hardness raw materials according to claim 1, wherein the bottom or the side part of the fine grinding stripping part is provided with a grid discharge hole with adjustable gaps, which is used for blocking microsphere media and allowing qualified fine powder to pass through.
6. The composite force field high-efficiency energy-saving grinding equipment for high-hardness raw materials according to claim 5 is characterized in that a hot air inlet is formed in the bottom of the equipment, an outlet at the top of the equipment is communicated with a high-efficiency dynamic powder selecting machine, hot air enters a channel at the side edge of a fine grinding stripping zone through the hot air inlet, and powder screened out of a grid discharge hole is led into the high-efficiency dynamic powder selecting machine through a rising channel.
7. A composite force field high-efficiency energy-saving grinding method for high-hardness raw materials is characterized by comprising the following steps of: s1, using a pre-crushing part arranged at the top of the device to perform primary crushing with impact force as a main factor on the fed bulk raw materials; S2, forming a strong vortex shearing force field when rolling materials by utilizing a vortex shearing part below the pre-crushing part, wherein the vortex shearing part is provided with a rotatable millstone and a fixed lining plate, and the working surface of the millstone and the working surface of the lining plate are mutually matched curved surfaces; S3, carrying out fine grinding with the grinding stripping force as the main factor on the falling materials by utilizing a fine grinding stripping part below the vortex shearing part, wherein the fine grinding stripping part is provided with a cavity filled with microsphere media and a stirring mechanism for stirring the microsphere media.
8. The efficient and energy-saving grinding method for the composite force field of the high-hardness raw materials, which is characterized in that microsphere mediums are high-chromium cast balls or zirconia ceramic balls.
9. The efficient and energy-saving grinding method for the composite force field of the high-hardness raw materials, which is disclosed in claim 7, is characterized in that the filling rate of microsphere media is controlled to be 50% -70%.
10. The composite force field efficient energy-saving grinding method for high-hardness raw materials according to claim 7, further comprising: s4, enabling hot air at 180-220 ℃ to enter a channel at the side edge of the fine grinding stripping area through a hot air inlet, and guiding powder screened out from a grid discharge hole into the efficient dynamic powder selector through a rising channel.

Description

High-efficiency energy-saving grinding equipment and method for composite force field of high-hardness raw materials Technical Field The invention belongs to the technical field of building materials and nonmetallic mineral powder grinding, and particularly relates to high-efficiency energy-saving grinding equipment and method for a composite force field of a high-hardness raw material. Background The high-hardness raw materials are key components in building materials or nonmetallic industries, such as quartz rock, sandstone, flint, cobble and part of tailings, have Mohs hardness of 6-7, have a Pond work index of generally more than 16kWh/t, have a mineral body of quartz (SiO 2) with complete crystallization, have high lattice energy and strong chemical inertness, cause slow reaction rate in the clinker calcination process, and become a bottleneck raw material for limiting the quality, the yield and the energy consumption of the clinker. The main stream equipment used for raw material grinding in the cement industry comprises a vertical roller mill (vertical mill) and a roller press, and the design principle and the core structure of the main stream equipment are grinding characteristics based on medium-hardness limestone (Mohs hardness of 3-4 and Pond work index of about 10 kWh/t). When used directly for grinding high hardness raw materials, the technical inadaptability and a series of problems caused by the inadaptability are remarkable, and the problems are mainly represented in the following three layers: 1. the grinding energy consumption is increased dramatically, and the economical efficiency is poor. The core crushing mechanism of the existing vertical mill and roller press is material bed crushing, and the material layer is subjected to extremely high linear pressure by virtue of a grinding roller, so that crushing is realized through mutual extrusion and friction among particles. This mode is more efficient for plastic or medium hardness materials, but has a principle disadvantage for high hardness, high brittleness materials, typically quartz. To achieve the target fineness, the system needs to apply higher milling pressures or to perform multiple cycles, resulting in a surge in power consumption per unit of product. Practice shows that the system power consumption of grinding quartz sandstone with the same fineness can be 30% -50% or more higher than that of grinding limestone. 2. The key parts are worn seriously, and the running cost is high. The high hardness quartz particles are extremely abrasive to the device contacts. In the high-pressure rolling process, the wear rate of the core wear-resistant parts such as the grinding roller sleeve, the grinding disc lining plate, the roller surface of the roller press and the like is increased in order of magnitude. The method not only leads to the rapid rise of the replacement cost of expensive wear-resistant materials, but also causes the decrease of the effective operating rate of equipment, the increase of maintenance frequency and the interruption of production continuity. The surface morphology of the worn roller surface or lining plate is changed, so that the grinding efficiency is further deteriorated, and a vicious circle of 'wear-efficiency reduction-higher pressure-accelerated wear' is formed. The too short wear-resistant service life becomes a primary engineering problem for restricting the large-scale grinding of high-hardness materials. 3. The product particle characteristics do not match the process targets. The traditional high-pressure rolling type crushing produces particles, the fracture of which occurs along the cleavage plane of the crystal, and a large number of particles with sharp edges and corners are easy to produce. The particle morphology has inherent defects of (1) high bulk density and poor fluidity, which affect the homogenization and transportation of subsequent raw materials, and (2) limited reactivity, sharp edges and corners have certain activity at the initial stage of calcination, but the specific surface area utilization rate of the whole particle is not optimal, and the flaky structure is unfavorable for close packing and ion diffusion. The ideal product is the micro powder with higher sphericity, abundant surface defects and concentrated particle size distribution, and the existing single pressure crushing force field is difficult to actively regulate and optimize the morphology of the particles. To cope with the above problems, attempts have been made to optimize the powder concentrator efficiency, improve the wear-resistant materials, adjust the process parameters, but these are all local improvements in the existing equipment frame, and the fundamental contradiction of "the crushing force field is not matched with the material characteristics" cannot be reached. There have also been attempts to introduce other grinding equipment, such as ball mills, which are less competitive but have higher energy consumpti