Production process system for preparing machine-made sand through vertical mill

Abstract

The invention discloses a production process system for preparing machine-made sand through a vertical mill. The production process system comprises a raw material bin, the machine-made sand verticalmill, a combined powder concentrator, a vibrating screen, a cyclone barrel and a circulating fan, wherein an outlet of the raw material bin is connected with a material inlet of the machine-made sandvertical mill; a material outlet of the machine-made sand vertical mill is connected with a material inlet of the combined powder concentrator; a bottom discharging port of the combined powder concentrator is connected with the vibrating screen; the vibrating screen returns oversize materials to the machine-made sand vertical mill; an air outlet of the combined powder concentrator is connected with the cyclone barrel; an air outlet of the cyclone barrel is connected with the circulating fan; the conical angle of each grinding roller of the machine-made sand vertical mill is not larger than 20degrees; the total projection area of the grinding rollers on a grinding disc is 20%-35% of the area of the grinding disc; a material blocking ring is a through type screening material blocking assembly or a crossing type material blocking ring; and an auxiliary discharging assembly is arranged on the grinding disc and positioned behind each grinding roller in the rotating direction of the grinding disc. The process system is simple in procedure, beneficial to large-scale production and better in environment-friendly effect, and ultra-clean emission can be achieved.

Description

technical field [0001] The invention belongs to the technical field of vertical mill sand production, in particular to a production process system for vertical mill preparation of machine-made sand. Background technique [0002] With the continuous development of the economy, the awareness of environmental protection has gradually become popular among the people. In the field of building materials, concrete is one of the materials used on a large scale. As the aggregate of concrete, sand and gravel play the role of skeleton in concrete. Aggregate is divided into coarse aggregate and fine aggregate. Coarse aggregate refers to aggregate with a particle size greater than 5mm, mainly natural rock or pebble; fine aggregate refers to aggregate with a particle size below 4.75mm, mainly river sand and machine-made sand. Generally speaking, river sand or machine-made sand is called fine sand according to different particle sizes, 0.075-1.18mm is called fine sand, 1.18-2.36mm is cal...

AI Technical Summary

Problems solved by technology

[0005] 1. The content of fine powder (less than 0.075mm) is too high in the manufacturing process, resulting in low sand forming rate, high energy consumption, waste of resources and low efficiency;

[0006] 2. There is accumulation of fine powder in the extension of the grinding disc, which causes excessive grinding in the accumulation area, poor operation stability of the vertical mill, poor equipment reliability, and high frequency of shutdown and maintenance;

[0007] 3. In the existing vertical mill, it can be seen from the drawings that tire rollers are used. There is an upward arc-shaped transition surface on the grinding disc of this grinding structure, which leads to poor fluidity of materials on the grinding disc;

[0008] 4. Does not involve auxiliary discharge, resulting in excessive fine powder content in the machine-made sand

[0009] As a more efficient and energy-saving grinding equipment, it is feasible to produce machine-made sand in principle, but to increase the particle size of the product from less than 0.075mm to less than 4.75mm, it is necessary to redesign the original vertical mill to solve the traditional The problem of high fine powder content, poor product circularity and high production energy consumption in machine-made sand crushing equipment

[0010] In addition, the current machine-made sand production system using crushers has poor sphericity, poor on-site dust collection effect, and serious ash emission during production, which does not meet the requirements of green production.

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