Mechanism sand production method

Abstract

The present invention relates to a method for producing machine-made sand, comprising the following steps: crushing waste concrete and screening out particles of a predetermined size; conveying the screened particles to an air separator to remove fine powder; and agitating the particles, free of fine powder, with water in a mixer to form machine-made sand. This method addresses the issues of existing machine-made sand products, such as the difficulty in ensuring product quality and the significant environmental impact of the production process. By utilizing waste concrete to produce machine-made sand, not only waste is reclaimed but also product quality is guaranteed, resulting in zero emissions of wastewater, waste residue, and exhaust gas.

Description

Technical Field

[0001] The present invention relates to the field of raw material processing, in particular to a method for producing machine-made sand. Background Art

[0002] With the tightening constraints on natural sand resource exploitation and the increasing emphasis on environmental protection, machine-made sand has gradually become the main source of construction sand in my country.

[0003] At present, the production process of artificial sand mainly adopts wet dust removal, and the mud content of the raw materials is not controlled, so the artificial sand produced has a large mud content. The incorporation of coarse crushed debris leads to poor particle shape and gradation of the artificial sand. In addition, the problem of flocculant residue in the sewage treatment process is becoming increasingly prominent. Moreover, the raw materials for producing artificial sand are mostly natural gravel, and the gravel mining process will also bring damage to the natural environment. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a method for producing machine-made sand, which solves the problems that the quality of existing machine-made sand products is difficult to guarantee and the production process has a great impact on the natural environment. By utilizing waste concrete to make machine-made sand, not only can waste utilization be achieved, but product quality can also be guaranteed, thereby achieving zero emissions of wastewater, waste residue and waste gas.

[0005] The technical solution to achieve the above purpose is:

[0006] The present invention provides a method for producing machine-made sand, comprising the following steps:

[0007] Crushing the waste concrete and screening out particles of a set size;

[0008] The screened particles are conveyed to a wind separator to remove fines;

[0009] The particles from which fine powder has been removed are mixed with water using a mixer to form machine-made sand.

[0010] The present invention proposes a method for producing machine-made sand. After the waste concrete is crushed to a set particle size, a winnowing machine is used to remove fine powder. The fine powder can be used as a mineral admixture for cement concrete later. The screened fine powder is mixed with water in a mixer to form machine-made sand, which can realize the reuse of waste concrete. The fine powder generated in the intermediate process can also be used for the production of cement concrete. This solves the problem that the quality of existing machine-made sand products is difficult to guarantee and the production process has a great impact on the natural environment. By making machine-made sand from waste concrete, not only can waste be utilized, but product quality can also be guaranteed, thereby achieving zero emissions of wastewater, waste residue and waste gas.

[0011] A further improvement of the machine-made sand production method of the present invention is that, during the crushing process, the method further comprises:

[0012] Use jaw crusher to crush the waste concrete and screen it through vibrating screen;

[0013] Particles with a size of less than 5 mm are screened out and sent to a vertical mill to be ground into fine powder;

[0014] Particles with a diameter greater than 50 mm are fed into the jaw crusher for further crushing.

[0015] A further improvement of the machine-made sand production method of the present invention is that it further comprises:

[0016] Particles with a diameter of 5 to 50 m are fed into the sand making machine for crushing and then screened through a vibrating screen;

[0017] Particles with a size larger than 3.3 mm are screened out and fed into the sand making machine for further crushing.

[0018] A further improvement of the machine-made sand production method of the present invention is that it further comprises:

[0019] Particles with a diameter of less than 3.3 mm are removed from fine powder using an air separator and added to a mixer to form machine-made sand.

[0020] A further improvement of the machine-made sand production method of the present invention is that it further comprises:

[0021] The fine powder removed by the air separator is mixed with the fine powder formed by grinding in the vertical mill to serve as a mineral admixture.

[0022] A further improvement of the machine-made sand production method of the present invention is that the mixer is a continuous mixer.

[0023] A further improvement of the machine-made sand production method of the present invention is that it further comprises:

[0024] When crushing waste concrete and using an air separator, a negative pressure dust collector is used to suppress dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure is a flow chart of the machine-made sand production method of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] The present invention provides a method for producing machine-made sand. After crushing waste concrete to a set particle size, fine powder is removed using an air separator. The fine powder can subsequently be used as a mineral admixture for cement concrete. The screened fine powder is mixed with water in a mixer to form machine-made sand. This enables the reuse of waste concrete, and the fine powder generated in the intermediate process can also be used in the production of cement concrete. This solves the problem that the quality of existing machine-made sand products is difficult to guarantee and the production process has a significant impact on the natural environment. By using waste concrete to produce machine-made sand, not only can waste be utilized, but product quality can also be guaranteed, thereby achieving zero emissions of wastewater, waste residue, and waste gas. The following is an illustration of the machine-made sand production method of the present invention with reference to the accompanying drawings.

[0028] See Figure 1 This is a flow chart of the machine-made sand production method of the present invention. Figure 1 , the machine-made sand production method of the present invention is described.

[0029] like Figure 1 As shown, the present invention provides a method for producing machine-made sand, comprising the following steps:

[0030] Crushing the waste concrete and screening out particles of a set size;

[0031] The screened particles are conveyed to an air separator to remove fines;

[0032] The particles from which fine powder has been removed are mixed with water using a mixer to form machine-made sand.

[0033] Preferably, the mixer is a continuous mixer to prevent problems such as segregation of machine-made sand.

[0034] As a preferred embodiment of the present invention, when crushing, it also includes:

[0035] Use jaw crusher to crush the waste concrete and screen it through vibrating screen;

[0036] Particles with a size of less than 5 mm are screened out and sent to a vertical mill to be ground into fine powder;

[0037] Particles with a diameter greater than 50 mm are fed into the jaw crusher for further crushing.

[0038] Specifically, it also includes:

[0039] Particles with a diameter of 5 to 50 m are fed into the sand making machine for crushing and then screened through a vibrating screen;

[0040] Particles with a size larger than 3.3 mm are screened out and fed into the sand making machine for further crushing.

[0041] Specifically, it also includes:

[0042] Particles with a diameter of less than 3.3 mm are removed from fine powder using an air separator and added to a mixer to form machine-made sand.

[0043] Preferably, it also includes:

[0044] The fine powder removed by the air separator is mixed with the fine powder formed by grinding in the vertical mill to be used as a mineral admixture in the production of cement concrete, thus avoiding waste.

[0045] Furthermore, it also includes:

[0046] When crushing waste concrete and using an air separator, a negative pressure dust collector is used to suppress dust.

[0047] The specific implementation of the present invention is as follows:

[0048] Use a jaw crusher to crush the waste concrete, and use a vibrating screen to re-feed the particles with a particle size larger than 50mm into the jaw crusher for further crushing. The vibrating screen will screen out the particles with a particle size smaller than 5mm, and the particles with a particle size of 5-50mm will be sent to the sand making machine;

[0049] Use a sand making machine to crush the particles, and use a vibrating screen to pass the particles with a diameter greater than 3.3 mm back into the sand making machine for further crushing. The vibrating screen will output the particles with a diameter less than 3.3 mm.

[0050] The particles output from the vibrating screen are dedusted using an air separator to remove fine powder;

[0051] The particles after removing fine powder are passed into a continuous mixer and stirred with water to form machine-made sand;

[0052] The particles with a size of less than 5 mm from the jaw crusher are fed into a vertical mill to be ground into fine powder and mixed with the fine powder removed from the air separator. The fine powder can then be used as a mineral admixture for cement concrete.

[0053] The present invention has been described in detail above with reference to the embodiments of the accompanying drawings. A person skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. A method for producing machine-made sand, characterized in that: The steps include: Crushing the waste concrete and screening out particles of a set size; The screened particles are conveyed to an air separator to remove fines; The particles after removing fine powder are mixed with water using a mixer to form machine-made sand; When crushing, it also includes: Use jaw crusher to crush the waste concrete and screen it through vibrating screen; Particles with a size of less than 5 mm are screened out and sent to a vertical mill to be ground into fine powder; The particles with a diameter greater than 50 mm are fed into the jaw crusher for further crushing; Also includes: Particles with a diameter of 5 to 50 mm are fed into the sand making machine for crushing and then screened through a vibrating screen; The particles with a diameter greater than 3.3 mm are screened out and fed into the sand making machine for further crushing; Also includes: Particles with a particle size of less than 3.3 mm are removed from fine powder using the air separator and added to the mixer to form machine-made sand; Also includes: The fine powder screened out by the air separator and the fine powder ground by the vertical mill are mixed to serve as a mineral admixture.

2. The method for producing machine-made sand according to claim 1, wherein: The mixer is a continuous mixer.

3. The method for producing machine-made sand according to claim 1, wherein: Also includes: When crushing waste concrete and using the air separator, a negative pressure dust collector is used to suppress dust.

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