阅读说明：本技术 一种工程制砂的方法 (Engineering sand making method ) 是由 岳金文 张祥富 钟聚光 耿必君 陈颖之 袁涛 丁任权 于 2019-10-23 设计创作，主要内容包括：本发明公开了一种工程制砂的方法,包括如下步骤：S1、粉碎：将母矿进行粉碎处理,得到砂石粗料；S2、球磨：将所得砂石粗料进行球磨处理,得到砂石细料；S3、筛选：对所得砂石细料进行筛选处理,得到所需规格的砂石；S4、分级：对所得砂石进行分级,得到不同级别的砂；S5、云母含量测定：对各级别的砂分别进行云母含量的测定；S6、风选：采用风选去除各不同级别的砂中的云母,所述风选的次数根据测得的各级别的砂试样中的云母含量确定；S7、云母含量二次测定：对风选所得的砂中的云母的含量再次进行测定。本发明的方法成本低、操作简单、效率高、可靠性好、能实现对云母含量精确控制、有效提高砂质量。(The invention discloses a method for producing engineering sand, which comprises the following steps: s1, crushing: crushing the mother ore to obtain coarse sandstone; s2, ball milling: performing ball milling treatment on the obtained coarse aggregate to obtain fine aggregate; s3, screening: screening the obtained fine sand and stone materials to obtain sand and stone with required specifications; s4, grading: grading the obtained sand and stone to obtain sand of different grades; s5, mica content determination: measuring the mica content of the sand of each grade; s6, air separation: removing mica in the sand of different grades by adopting air separation, wherein the number of air separation is determined according to the measured mica content in the sand sample of each grade; s7, secondary determination of mica content: and (4) measuring the content of mica in the sand obtained by air separation again. The method has the advantages of low cost, simple operation, high efficiency and good reliability, can realize accurate control of the mica content and effectively improve the sand quality.)

1. A method for manufacturing engineering sand is characterized by comprising the following steps:

s1, crushing: crushing the mother ore to obtain coarse sandstone;

s2, ball milling: performing ball milling treatment on the obtained coarse aggregate to obtain fine aggregate;

s3, screening: screening the obtained fine sand and stone materials to obtain sand and stone with required specifications;

s4, grading: grading the obtained sand and stone to obtain sand of different grades;

s5, mica content determination: measuring the mica content of the sand of each grade;

s6, air separation: removing mica in the sand of different grades by adopting air separation, wherein the number of air separation is determined according to the measured mica content in the sand sample of each grade;

s7, secondary determination of mica content: and (4) measuring the content of mica in the sand obtained by air separation again.

2. The method for producing engineering sand according to claim 1, wherein the step S7 further comprises: and if the mica content exceeds the actual standard, returning the unqualified sand to the step S6 for air separation again.

3. The method for producing engineering sand according to claim 1 or 2, wherein in the step S1, the mother ores are the deplated mother ores; the method for removing soil comprises the following steps: washing the mud on the surface of the mother ore by water, and then airing; the airing time is 12-18 h.

4. The method for producing engineering sand according to claim 1 or 2, wherein in the step S1, the crushing treatment is performed by using a jaw crusher; the width of a feeding hole of the jaw crusher is 600 multiplied by 400mm, the output power of a motor of the jaw crusher is 28-40 kW, and the size of the jaw crusher is 1700 multiplied by 1800 multiplied by 1600 mm.

5. The method for producing engineering sand according to claim 1 or 2, wherein in the step S2, the ball milling is performed by a ball mill; the rotating speed of a cylinder body of the ball mill is 30-40 r/min, the ball loading capacity of the ball mill is 1.5-1.8 t, and the output power of a motor of the ball mill is 20-24 kW.

6. The method for producing engineering sand according to claim 1 or 2, wherein in the step S3, the mesh size of the screen is 150-200 mesh; the screening time is 20-30 min.

7. The method for producing engineering sand according to claim 1 or 2, wherein in the step S6, the number of air separation is 1-3; the power of the separator that the selection by winnowing adopted is 14 ~ 23 kW.

8. The method for manufacturing engineering sand according to claim 1 or 2, wherein in the step S5, before weighing a certain amount of engineering sand samples of different grades, the method further comprises drying the engineering sand samples, wherein the temperature of the drying process is 100 to 110 ℃.

9. The method for producing engineering sand according to claim 1 or 2, wherein in the step S3, the sand with the required specification has a particle size of 0.315-0.5 mm.

10. The method of engineering sand of claim 1 or 2, wherein the method of mica content determination comprises: weighing a certain amount of engineering sand-making samples of different grades according to the requirement, picking out and weighing all mica in the engineering sand-making samples of different grades, and calculating the mica content in the engineering sand-making samples of different grades.

Technical Field

The invention belongs to the technical field of engineering sand making, and particularly relates to a method for making engineering sand.

Background

Mica is a rock-making mineral, presents a hexagonal flaky crystal form, is one of main rock-making minerals, has a layered structure in the mica crystal, is a flaky crystal, is mainly based on the hexagonal flaky crystal, has the characteristics of insulation and high temperature resistance, is mostly sericite industrially used, is widely applied to industries such as coating, paint, electrical insulation and the like, when the content of the mica in engineering sand exceeds 2%, the loss of the working degree of concrete prepared by the engineering sand reaches 50%, and when the content of the mica in aggregate reaches 10%, the collapse degree of the concrete reaches 100%, so the control on the content of the mica in the engineering sand is particularly important.

However, the existing engineering sand making method is often complex in process, high in cost, low in efficiency and insufficient in reliability, and the quality of the sand and the mica content in the sand are difficult to accurately regulate and control.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide the engineering sand making method which has the advantages of low cost, simple operation, high efficiency and good reliability, can realize accurate control of mica content and effectively improve the sand quality.

In order to solve the technical problems, the invention adopts the following technical scheme:

a method for manufacturing engineering sand comprises the following steps:

s1, crushing: crushing the mother ore to obtain coarse sandstone;

s2, ball milling: performing ball milling treatment on the obtained coarse aggregate to obtain fine aggregate;

s3, screening: screening the obtained fine sand and stone materials to obtain sand and stone with required specifications;

s4, grading: grading the obtained sand and stone to obtain sand of different grades;

s5, mica content determination: measuring the mica content of the sand of each grade;

s6, air separation: removing mica in the sand of different grades by adopting air separation, wherein the number of air separation is determined according to the measured mica content in the sand sample of each grade;

s7, secondary determination of mica content: and (4) measuring the content of mica in the sand obtained by air separation again.

In the above method for producing engineering sand, preferably, the step S7 further includes: and if the mica content exceeds the actual standard, returning the unqualified sand to the step S6 for air separation again.

In the above method for producing engineering sand, preferably, in step S1, the mother ores are the mother ores from which the clay is removed; the method for removing soil comprises the following steps: washing the mud on the surface of the mother ore by water, and then airing; the airing time is 12-18 h.

In the above method for producing engineering sand, in step S1, the crushing equipment is preferably a jaw crusher; the width of a feeding hole of the jaw crusher is 600 multiplied by 400mm, the output power of a motor of the jaw crusher is 28-40 kW, and the size of the jaw crusher is 1700 multiplied by 1800 multiplied by 1600 mm.

In the above method for manufacturing engineering sand, preferably, in step S2, the ball milling is performed by using a ball mill; the rotating speed of a cylinder body of the ball mill is 30-40 r/min, the ball loading capacity of the ball mill is 1.5-1.8 t, and the output power of a motor of the ball mill is 20-24 kW.

In the above method for producing engineering sand, preferably, in step S3, the aperture of the screened mesh is 150-200 meshes; the screening time is 20-30 min.

In the above method for producing engineering sand, preferably, in step S6, the number of air separation is 1 to 3; the power of the separator that the selection by winnowing adopted is 14 ~ 23 kW.

In the above method for manufacturing engineering sand, preferably, in step S5, before weighing a certain amount of engineering sand samples of different grades, the method further includes drying the engineering sand samples, where the temperature of the drying process is 100 to 110 ℃.

In the above method for producing engineering sand, in step S3, the sand with the required specification preferably has a particle size of 0.315 to 0.5 mm.

Preferably, the method for producing engineering sand includes: weighing a certain amount of engineering sand-making samples of different grades according to the requirement, picking out and weighing all mica in the engineering sand-making samples of different grades, and calculating the mica content in the engineering sand-making samples of different grades.

Compared with the prior art, the invention has the advantages that:

1. the method comprises the steps of crushing, ball-milling and screening mother ores to obtain sands with the obtained specification, grading, taking part of samples in the sands with different grades to measure the mica content in the sands with different grades, removing the mica in the sands with different grades by adopting air separation, determining the air separation frequency according to the measured mica content in the sand samples with different grades, and measuring the mica content for the second time after the air separation is finished. Through the organic combination of crushing, ball milling, screening, grading, mica content measurement, sorting and secondary measurement of the content of the denominator according to a specific sequence, the method is simple, scientific, reasonable, low in cost and high in efficiency, so that the stability control of the particle size uniformity and the fineness modulus of a test sample is ensured, the reliability of test data is favorably improved, the accuracy of a test result is improved, and the quality of finished sand and the accuracy of mica content control are favorably improved. The defects that the prior sand making process is difficult to realize the incomplete control of sand quality and mica content, complex and fussy process, high cost and the like are overcome.

2. According to the invention, mica content determination is carried out on the engineering sand subjected to air separation and mica removal, and air separation treatment is carried out on unqualified engineering sand again to determine that the mica content in the final engineering sand reaches the standard, so that the accuracy of quality control on the engineering sand is further improved, and a qualified product is obtained; the times of air separation are determined according to the measured mica content in the engineering sand making samples of all levels, so that the method is more targeted and is beneficial to improving the air separation efficiency and accuracy.

3. According to the invention, by controlling the technological parameters of crushing and ball milling, the diameter of the screening mesh, the screening time and the like, the stability of fineness modulus can be ensured, good gradation is ensured, the quality of sand is improved, the reliability of a test result can be further improved, the accuracy of control of a subsequent winnowing process is further improved, the accurate control of mica content is realized, the quality of engineering sand-making products is further ensured, the collapse degree and the water content of concrete made by engineering sand-making are reduced, and the quality of concrete is effectively improved.

4. According to the invention, the mother ore before crushing is cleaned and dried, so that the dust content in the obtained engineering sand can be effectively reduced, and the quality is improved.

5. In the invention, the winnowing parameters are reasonably controlled, so that the winnowing effect and efficiency are favorably improved.

Drawings

FIG. 1 is a schematic view of the process flow of the engineering sand making of the present invention.

Detailed Description

The invention will be described in further detail below with reference to the drawings and specific examples.