阅读说明：本技术 一种测试矿石品位分布方法 (Method for testing ore grade distribution ) 是由 王平 程爱平 兰建强 曾文旭 刘红阳 闫曳綪 于 2020-05-06 设计创作，主要内容包括：本发明公开了一种测试矿石品位分布方法,属于磁铁矿石地下开采技术领域。所述测试矿石品位分布方法包括以下步骤:通过凿岩机的钎杆上向中深孔钻屑,通过钻屑收集装置收集若干份钻屑；将若干所述钻屑分别放入磁性物质含量测试仪内,获取所述钻屑的四氧化三铁的含量；根据若干所述钻屑的四氧化三铁的含量,获取若干所述铁矿石的品位；根据若干所述铁矿石的品位绘制矿体内矿石品位分布图。本发明测试矿石品位分布方法根据钻屑磁性来测试矿石品位,在满足测试精度的基础上,具有操作简便快捷、耗时短、费用较低优点,能够可靠地使用于井下现场的矿石品位测试。(The invention discloses a method for testing ore grade distribution, and belongs to the technical field of magnetite underground mining. The method for testing ore grade distribution comprises the following steps of collecting a plurality of drill cuttings by a drill rod of a rock drill and a drill cuttings collecting device; respectively putting a plurality of drill cuttings into a magnetic substance content tester to obtain the content of ferroferric oxide in the drill cuttings; according to the content of ferroferric oxide in the drill cuttings, obtaining the grades of the iron ores; and drawing an ore grade distribution diagram in the ore body according to the grades of the iron ores. The ore grade distribution testing method tests the ore grade according to the magnetism of the drill cuttings, has the advantages of simplicity, convenience and rapidness in operation, short time consumption and lower cost on the basis of meeting the testing precision, and can be reliably used for testing the ore grade on the underground site.)

1. A method for testing ore grade distribution is characterized by comprising the following steps:

drilling cuttings in the medium-deep hole are collected through a drill rod of the rock drill and a plurality of drilling cuttings are collected through a drilling cuttings collecting device;

respectively putting a plurality of drill cuttings into a magnetic substance content tester to obtain the content of ferroferric oxide in the drill cuttings;

according to the content of ferroferric oxide in the drill cuttings, obtaining the grades of the iron ores;

and drawing an ore grade distribution diagram in the ore body according to the grades of the iron ores.

2. The method of testing ore grade distribution according to claim 1, wherein the collecting portions of drill cuttings with a collection trough comprises:

and taking the drilling of one drill rod as a unit for collecting the drill cuttings once, and respectively storing the drill rods, wherein the drill rods are used as the serial numbers for collecting the drill cuttings once according to the drilling sequence of the drill holes.

3. The method of testing ore grade distribution according to claim 1, wherein said obtaining the grade of iron ore comprises:

the magnetic material content tester measures the content alpha of ferroferric oxide in the iron ore;

the grade TFe ═ α ═ 0724 of the iron ore.

4. The method of testing ore grade distribution according to claim 1, wherein said mapping ore grade profiles within an ore body comprises:

when the construction of the fan-shaped blast hole on one section is finished, the drill chip collection test and the data statistics can be completed, the distribution data of the ore grade on the section is determined, and the measurement result is obtained according to the distribution data;

making the measurement result into a contour map, and determining the ore grade value of each point of the blast hole according to an interpolation method;

the grade value is divided into equal parts meeting the field use requirement, and the same grade value points on adjacent blast holes are connected by a smooth curve, so that the contour map of the ore grade distribution can be formed.

5. The method of testing ore grade distribution according to claim 1, wherein the cuttings collection apparatus comprises: a collection plate;

the collecting plate is fixedly arranged on the rock drill, a collecting groove is formed in the collecting plate, and a through hole is formed in the middle of the collecting plate;

and a drill rod of the rock drill penetrates through the through hole.

6. The cuttings collection apparatus of claim 5, further comprising: a flow channel;

the flow groove is communicated with the collecting groove.

7. The cuttings collection apparatus of claim 5, wherein:

and a filter screen is fixedly arranged on the end surface of the flow groove, which is away from the collecting plate.

8. The cuttings collection apparatus of claim 5, further comprising: a support bar;

the first end of bracing piece with the bottom fixed connection of collecting plate, the second end of bracing piece with rock drill fixed connection.

Technical Field

The invention relates to the technical field of underground mining of magnetic iron ores, in particular to a method for testing ore grade distribution.

Background

In the underground mining of iron ores, the most frequently used mining method is a sill pillar-free sublevel caving method, and the most remarkable characteristic of the sill pillar-free sublevel caving method is ore drawing under overlying rocks, which easily causes the problem of serious dilution loss of ores. Therefore, a field ore grade testing method is needed, which can quickly and accurately obtain the ore grade distribution condition of the ore body to be mined, provides favorable conditions for mine mining technicians to make mining plans, field construction design, later-stage ore blending and other operations, and has important significance for improving the recovery benefits of mineral resources.

The ore grade in the ore body is generally known by performing laboratory test on the ore grade in a drill core during ground surface ore exploration or detecting the ore after the ore block is collapsed on site, wherein the test result of the laboratory test is relatively rough for the whole ore; the detection result of the latter loses the significance of guiding the mine production plan.

And the grade of the ore block to be caving is accurately tested according to the upward medium-length hole drilling procedure, and the test result can be applied to making a next working plan by technicians.

In the aspect of ore grade testing, the current domestic common testing methods comprise the following steps: chemical analysis, X-ray analysis, and visual observation.

Chemical analysis method test: the test result is more accurate, but the method has more procedures and long time consumption and is difficult to apply to the field;

x-ray analysis test: the test result is not accurate enough, and the method can generate adverse effect on the site construction environment;

visual observation method: firstly, the test result is not accurate enough, and the observation of the internal condition of the ore body can not be realized.

Disclosure of Invention

The invention provides a method for testing ore grade distribution, which solves or partially solves the technical problems of complex operation, long time consumption and high cost of the prior art in the ore grade testing method.

In order to solve the technical problem, the invention provides a method for testing ore grade distribution, which comprises the following steps of collecting a plurality of drill cuttings by a drill cutting collecting device from a drill rod of a rock drill to a medium-length hole drill cuttings; respectively putting a plurality of drill cuttings into a magnetic substance content tester to obtain the content of ferroferric oxide in the drill cuttings; according to the content of ferroferric oxide in the drill cuttings, obtaining the grades of the iron ores; and drawing an ore grade distribution diagram in the ore body according to the grades of the iron ores.

Further, the collecting of the plurality of cuttings with the collection tank includes: and taking the drilling of one drill rod as a unit for collecting the drill cuttings once, and respectively storing the drill rods, wherein the drill rods are used as the serial numbers for collecting the drill cuttings once according to the drilling sequence of the drill holes.

Further, the obtaining the grade of the iron ore comprises: the magnetic material content tester measures the content alpha of ferroferric oxide in the iron ore; the grade TFe ═ α ═ 0724 of the iron ore.

Further, the mapping the ore grade distribution map in the ore body comprises: when the construction of the fan-shaped blast hole on one section is finished, the drill chip collection test and the data statistics can be completed, the distribution data of the ore grade on the section is determined, and the measurement result is obtained according to the distribution data; making the measurement result into a contour map, and determining the ore grade value of each point of the blast hole according to an interpolation method; the grade value is divided into equal parts meeting the field use requirement, and the same grade value points on adjacent blast holes are connected by a smooth curve, so that the contour map of the ore grade distribution can be formed.

Further, the cuttings collection apparatus includes: a collection plate; the collecting plate is fixedly arranged on the rock drill, a collecting groove is formed in the collecting plate, and a through hole is formed in the middle of the collecting plate; and a drill rod of the rock drill penetrates through the through hole.

Further, the cuttings collection apparatus further comprises: a flow channel; the flow groove is communicated with the collecting groove.

Furthermore, a filter screen is fixedly arranged on the end face, away from the collecting plate, of the flow groove.

Further, the cuttings collection apparatus further comprises: a support bar; the first end of bracing piece with the bottom fixed connection of collecting plate, the second end of bracing piece with rock drill fixed connection.

One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

the drilling cuttings are collected through the drilling cuttings collecting device and are respectively placed into the magnetic substance content tester to obtain the ferroferric oxide content of the drilling cuttings, the grades of a plurality of iron ores are obtained according to the ferroferric oxide content of the drilling cuttings, and the ore grade distribution map in an ore body is drawn according to the grades of the iron ores.

Drawings

Fig. 1 is a schematic flow chart of a method for testing ore grade distribution according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a cuttings collection apparatus provided in an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of the cuttings collection apparatus of FIG. 2;

FIG. 4 is a schematic representation of the operation of the cuttings collection apparatus of FIG. 2;

FIG. 5 is a diagram of the spatial positions and numbering modes of the drill rods divided on the cross section of the fan-shaped blast hole in the ore grade distribution testing method in FIG. 1;

fig. 6 is a contour map of the ore grade distribution according to the test results in the method of testing the ore grade distribution of fig. 1.

Detailed Description

Referring to fig. 1, a method for testing ore grade distribution according to an embodiment of the present invention includes the following steps:

step 1, drilling cuttings in medium-length holes are collected through a drill rod 2 of a rock drill 1 and a plurality of drilling cuttings are collected through a drilling cuttings collecting device 3.

And 2, respectively putting a plurality of drill cuttings into a magnetic substance content tester to obtain the ferroferric oxide content of the drill cuttings.

And 3, obtaining a plurality of iron ore grades according to the content of ferroferric oxide in the drill cuttings.

And 4, drawing an ore grade distribution map in the ore body according to the grades of the iron ores.

In the specific embodiment of the application, as the drill cuttings in the medium-length hole are collected by the drill rod 2 of the rock drilling machine 1 and a plurality of drill cuttings are collected by the drill cuttings collecting device 3, the drill cuttings are respectively put into the magnetic substance content tester to obtain the content of ferroferric oxide in the drill cuttings, obtaining a plurality of iron ore grades according to the content of ferroferric oxide in a plurality of drill cuttings, drawing an ore grade distribution diagram in an ore body according to the plurality of iron ore grades, therefore, the ore grade is tested according to the magnetism of the drill cuttings, and on the basis of meeting the test precision, the method has the advantages of simple and rapid operation, short time consumption and lower cost, can be reliably used for testing the ore grade on the underground site, the method provides favorable conditions for mine mining technicians to make mining plans, field construction design, later-stage ore blending and other operations, and has important significance for improving the recovery benefits of mineral resources.

Step 1 is described in detail.

Collecting several portions of drill cuttings through a collection tank includes:

drilling of a drill rod is taken as a unit for collecting drill cuttings once, and the drill rods are respectively stored, and the drill rods are taken as the serial numbers of the drill cuttings collected once according to the drilling sequence of the drill holes. For example, the drill cuttings produced by the nth drill rod of the mth drill hole are numbered m-n.

Step 3 is described in detail.

Obtaining the grade of the iron ore comprises: measuring the content alpha of ferroferric oxide in the iron ore by a magnetic substance content tester; the grade of iron ore, TFe ═ α ═ 0724.

The drill cuttings can be subjected to grade testing immediately after collection, and can also be subjected to centralized testing. 100g of cuttings collected at a certain time are randomly taken out, and are tested by using a magnetic substance content tester, and a test result a is output in the form of percentage. The grade of iron ore TFe refers to the mass ratio of iron element in the ore, and the main component of magnetite is ferroferric oxide (Fe)₃O₄) The mass fraction of iron element in the molecule is 72.4%, so the theoretical highest grade of magnetite is 72.4%, the test result in the magnetic material content tester refers to the content of ferroferric oxide, so the ore grade TFe (m-n) according to the drill cutting test is calculated by the following formula, and represents the average value of the ore grade at the spatial position of the nth drill rod of the mth drill hole, wherein TFe (m-n) is a × 0.724.724.

Step 4 is described in detail.

The drawing of the ore grade distribution map in the ore body comprises the following steps:

and step 41, when the construction of the fan-shaped blast hole on one section is finished, completing the drill chip collection test and data statistics, determining the distribution data of the ore grade on the section, and obtaining a measurement result according to the distribution data.

And step 42, making the measurement result into a contour map, and determining the ore grade value of each point of the blast hole according to an interpolation method.

And 43, dividing the grade values into equal parts meeting the field use requirements, and connecting the same grade value points on the adjacent blast holes by using smooth curves to form an contour map of the ore grade distribution.

After the construction of the fan-shaped blast hole on one section is finished, the drill chip collection test and data statistics can be completed, the distribution data of the ore grade on the section can be determined, and the measurement result is obtained according to the distribution data. The measurement result is made into a contour map, the distribution situation of the ore grade on the section of the ore body can be observed more visually, the TFe (m-n) value is assumed to represent the ore grade value at the midpoint of the m-n drill rods, the domestic mine structure parameter size can be known, the depth of the upward medium-length hole is generally between 8 and 25 drill rods, so that 8 to 25 grade test values exist on each blast hole, and the ore grade value of each point of the blast hole can be determined according to an interpolation method. The grade value is divided into equal parts meeting the field use requirement, and the same grade value points on adjacent blast holes are connected by a smooth curve, so that the contour map of the ore grade distribution can be formed.

Referring to fig. 2-4, the cuttings collection apparatus includes: collecting plate 3-1.

The collecting plate 3-1 is fixedly arranged on the rock drill 1, a collecting groove is formed in the collecting plate 3-1, and a through hole is formed in the middle of the collecting plate 3-1.

The shank 2 of the rock drill 1 passes through said through hole.

Wherein, along with the propulsion of drill rod 2 during upward drilling, the drill chip is followed drilling department and is followed rivers and rush out, falls in the collecting vat, receives the drill chip that falls out in will drilling completely through the collecting vat.

The cuttings collection apparatus further comprises: and a flow channel 3-2.

The flow channel 3-2 communicates with the collecting channel for draining the water.

The end face, deviating from the collecting plate 3-1, of the flowing groove 3-2 is fixedly provided with the filter screen 3-3, and drilling cuttings are shielded by the filter screen 3-3, so that the drilling cuttings are prevented from being discharged along with water.

Wherein, the height of the end of the flow groove 3-2 departing from the collecting plate 3-1 is less than the height of the end of the flow groove 3-2 close to the collecting plate 3-1, so as to facilitate the outflow of water.

In particular, cuttings collection device 3 further comprises: and 3-4 of supporting rods.

The first end of the supporting rod 3-4 is fixedly connected with the bottom of the collecting plate 3-1, the second end of the supporting rod 3-4 is fixedly connected with the rock drill 1, the collecting plate 3-1 is supported through the supporting rod 3-4, and the stability of the collecting plate 3-1 for collecting drill cuttings is guaranteed.

To more clearly describe the embodiments of the present invention, the following description is provided in terms of the methods of using the embodiments of the present invention.

In the field of a rock drilling process of underground non-pillar sublevel caving mining, a collecting plate 3-1 is arranged at the front end of a rock drill 1.

The worker performs conventional rock drilling, but drilling one drill rod each time, the drill cuttings collected in the collection tank need to be extracted and numbered according to the sequence (m-n) of drilling and drill rods, the length of each drill rod is 1.2m, and the numbering rule is shown in fig. 5.

The grade of the drill cuttings is tested according to the magnetic principle, and the drill cuttings can be subjected to grade testing immediately after being collected and can also be subjected to later concentrated testing. The specific steps of the test are that 100g of the collected drill cuttings are extracted, placed in a magnetic substance content detector (the model of the magnetic substance content detector is DTC8A, m384492 and the like), the test result a is recorded in a table, and the test data is expressed according to the formula: TFe (m-n) ═ a × 0.724 was converted to mineral grade values, as shown in table 1 for a portion of the test data:

TABLE 1 drill chip grade test values

The test data is assumed to be the ore grade value at the midpoint of each section of spatial position, and the ore grade value at each other point on the drill hole can be determined by an interpolation method. The contour plot of the scale is again taken at 2% as shown in FIG. 6. Therefore, the grade distribution condition of the ore 4 to be caving can be observed more intuitively, and reference is provided for the next mining operation.

The ore grade is tested according to the magnetism of the drill cuttings, the method has the advantages of simplicity, convenience, rapidness, short time consumption and low cost on the basis of meeting the testing precision, can be reliably used for the ore grade testing method of the underground site, depends on the medium-length hole rock drilling process to test the grade distribution condition of the ore to be mined, can provide favorable conditions for mine mining technicians to make mining plans, site construction design, later-stage ore blending and other operations, and has important significance for improving the recovery benefit of mineral resources.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.