JPH11314948A - Production of artificial sand and its apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for producing high-quality artificial sand. SOLUTION: Raw ore material contg. granite is treated with a primary crusher and is subjected to a wet process treatment with a rod mill or ball mill and then to a sieving treatment. The coarse grain component larger than a prescribed grain size is treated with a hydraulic gyratory crusher for crushing the grains to each other and/or vertical type rotary centrifugal crusher and is then subjected to the sieving treatment. The fine grain component smaller than the prescribed size is subjected to the wet process treatment at least once with the rod mill or ball mill and is further subjected to grain size regulation by using a fine sand and recovering device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for producing artificial sand.

[0002]

2. Description of the Related Art In recent years, natural sands such as sea sand and river sand used in asphalt mixtures have become difficult to collect from the viewpoint of depletion of resources and environmental protection. There is increasing interest in developing and utilizing artificial sand as an alternative. However, as the artificial sand or fine aggregate used in the asphalt mixture, there are known screenings generated during crushed stone production and grain-improved products of masago, but the quality does not reach the quality of aqueous natural sand, and the quality is poor. There is a problem that it is not constant. An object of the present invention is to eliminate these problems of the prior art and to stably produce a large amount of high-quality artificial sand that fuses with the same or better performance as natural sand according to the design target particle size. An object of the present invention is to provide a method and an apparatus for producing artificial sand.

[0003]

According to the present invention, first, a raw material containing granite is treated by a primary crusher, wet-processed by a rod mill or a ball mill, and then sieved. Crushed by a hydraulic rotary crusher and / or a rigid rotary centrifugal crusher, and then sieved. Fine particles smaller than a predetermined particle size are wet-processed at least once with a rod mill or ball mill, and then fine sand. A method for producing artificial sand, characterized in that the particle size is adjusted using a recovery device. In the second aspect of the present invention, a primary crusher, a wet rod mill or a ball mill, and a primary sieve are arranged in this order. An artificial sand production apparatus characterized by combining a rotary centrifugal crusher, a classifier, and a fine sand recovery apparatus.

[0004]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. FIG. 1 is a flow sheet showing a typical example of the method and apparatus for producing artificial sand of the present invention. The rough is put into a primary crusher, crushed, and then wet-processed with water using a rod mill. Here, the rough is washed to prevent impurities from being mixed into the product. Next, for example, 10m with a primary sieve
It is separated into coarse particles of m over and fine particles of 10 mm under. The predetermined particle size may vary depending on the target particle size, the type of rough stone, and the like, but is usually about 10 mm ± 5 mm. Next, the fine particles are wet-processed in a primary ball mill using water. Here, the adjustment of the particle size and the improvement of the particle shape are performed. The more water you pour, the coarser and the less you pour, the finer
The higher the ball density, the smaller the particle size.

[0005] Next, for example, a 3 mm over portion and a 3 mm under portion are separated by a secondary sieve, and the 3 mm over portion is further subjected to the same secondary ball mill treatment, and then subjected to a tertiary sieve. In the present invention, a ball mill may be used instead of the above-described rod mill, and a rod mill may be used instead of the ball mill. After the primary sieving treatment, the mixture may be subjected to a primary ball mill treatment through a classifier, and the other may be subjected to a secondary ball mill treatment. Classification is performed by a classifier through such processing.

On the other hand, the coarse particles separated by the primary sieving treatment are subjected to treatment by a hydraulic rotary crusher for crushing between particles and a rigid rotary centrifugal crusher. A champion disk or the like is known as the former crushing machine, and a burmac or the like is known as the latter crushing machine. By these treatments, crushing and improvement of the particle shape (sharpening) are performed. These are preferably used in the above order, but may be reversed or only one may be used. Next, one of them is sieved, and the other is further subjected to a ball mill treatment in the same manner as described above, sieved and provided to a classifier.

[0007] Particle size adjustment is further performed by a combination of a classifier and a fine sand recovery device. The material is allowed to settle in the water bath to remove coarse particles and the fines (eg, 75 μm or less) approach 0%. Fine particles are collected by a fine sand collecting device and mixed with coarse particles to adjust the particle size. By the above processing, high quality ordinary sand, concrete, and asphalt mixture can be obtained. In the present invention, a raw material that contains granite as an essential component is particularly preferable in combination with the above-described processing means. More preferred is a mixture of granite and crushed rough. The ratio between the two is such that the amount of granite is usually 10 to 30% by weight, especially 20%.
% By weight is preferred.

[0008] When the artificial sand produced according to the present invention is used in an asphalt mixture, the properties of the mixture are superior to those of natural sand. In addition, the artificial sand of the present invention has excellent particle shape as an aggregate and does not contain impurities, and the method and apparatus of the present invention can be used in accordance with a product to be used such as concrete, asphalt mixture, etc. It has the advantage that the particle size can be controlled.

[0009]

EXAMPLE Artificial sand was produced using only granite and a 2: 8 mixture of granite and crushed stone using an apparatus according to the flow sheet shown in FIG. Artificial sand from granite alone is referred to as artificial sand 1, artificial sand from a mixture of granite and crushed stone is referred to as artificial sand 2, and screenings (Scr.) + Sea sand and Sc
r. + The quality of artificial sand made of masa sand (washed) and fine aggregate was compared and examined. The test outline is a property test of the aggregates, and in a fine-grained As (13,20 mm) and coarse-grained (20 mm) asphalt mixture,
The physical properties of various fine aggregates and the effects on the mixture were examined by various tests. The obtained test results, and the compounding ratios and synthetic particle sizes of various mixtures are shown in Tables 1 to 4.
As shown in FIG.

[0010]

[Table 1]

[0011]

[Table 2]

[0012]

[Table 3]

[0013]

[Table 4]

[Brief description of the drawings]

FIG. 1 is a flow sheet showing an artificial sand production system of the present invention.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naoki Mizuno 1-19-11 Kyobashi, Chuo-ku, Tokyo Inside Nihonbudo Co., Ltd. (72) Inventor Takaichi Sugano 462 Shimobuno, Finomura, Futami-gun, Hiroshima Prefecture No. 3 Iwakura Sangyo Co., Ltd.

Claims (4)

[Claims] 1. A raw material containing granite is processed by a primary crusher, wet-processed by a rod mill or a ball mill, and then sieved, and coarse particles larger than a predetermined particle size are subjected to a hydraulic rotary crusher for interparticle crushing and / or Alternatively, sieving after treatment with a rigid rotary centrifugal crusher, wet treatment of fine particles smaller than a predetermined particle size at least once with a rod mill or ball mill, and further adjusting the particle size using a fine sand recovery device A method for producing artificial sand. 2. The method according to claim 1, wherein the rough material is a mixture of granite and crushed rough. 3. A fine particle having a particle size smaller than a predetermined particle size after being processed by a hydraulic rotary crusher and / or a rigid rotary centrifugal crusher for interparticle crushing and then sieving is wet-processed by a rod mill or a ball mill. The method according to claim 1 or 2, wherein the method is used. 4. A primary crusher, a wet rod mill or a ball mill, and a primary sieve are arranged in this order, and a plurality of wet rod mills or a ball mill, a plurality of sieves, a hydraulic rotary crusher for crushing between particles, a rigid rotary An artificial sand production apparatus characterized by combining a centrifugal crusher, a classifier, and a fine sand recovery apparatus.