Process system for producing exquisite sand by adopting machine-made sand vertical mill

Abstract

The invention discloses a process system for producing exquisite sand by adopting a machine-made sand vertical mill. The process system comprises a raw material cabin, the machine-made sand vertical mill, a combined powder concentrator, a vibrating screen, a cyclone and a circulating fan, wherein the raw material cabin, the machine-made sand vertical mill and the combined powder concentrator are sequentially connected; a bottom discharging opening of the combined powder concentrator is connected with the vibrating screen; the vibrating screen returns oversize products to the machine-made sandvertical mill; the air outlet of the combined powder concentrator is connected with the cyclone; the air outlet of the cyclone is connected with the circulating fan; a plurality of layers of screens with different pore diameters are arranged on the vibrating screen; a pre-screening device is arranged between the machine-made sand vertical mill and the combined powder concentrator; the process system further comprises a machine-made sand blending system for blending sand out of the combined powder concentrator and the vibrating screen; and the machine-made sand blending system comprises a weighing device, a mixing device, a conveying device and a storing device. The process system can realize high-quality machine-made sand production, can produce the machine-made sand meeting any fineness modulus requirement, meets different product demands and realizes multiple functions of a production system.

Description

technical field [0001] The invention belongs to the technical field of vertical mill sand making, in particular to a process system for producing high-quality sand with a machine-made sand vertical mill. 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 ...

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 of the prepared machine-made sand, and cannot be used for blending the produced multi-product machine-made sand. The on-site dust collection effect is also poor, and the production of dust is serious, which does not meet the requirements of green production. Require

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