A method for manufacturing a metal mesh cage for iron ore shaft furnace charging test

Abstract

The present application relates to a kind of iron ore shaft furnace investment cage test metal mesh cage manufacturing method, to solve the problems existing in the manufacturing of current metal mesh cage, such as many times of metal mesh folding, complex manufacturing process, small volume of metal mesh cage, small loading capacity, etc., the manufacturing method is as follows: a bowl-shaped mold and a gourd-shaped round hammer are made, a square metal mesh is placed directly above the bowl-shaped mold, the gourd-shaped round hammer is pressed down along the middle of the square metal mesh, the gourd-shaped round hammer and the square metal mesh are in contact with the bottom of the bowl-shaped mold during plastic deformation, then the gourd-shaped round hammer and the pocket-shaped iron cage are taken out of the bowl-shaped mold, the test iron ore is added to the pocket-shaped iron cage, then the four corners of the pocket-shaped iron cage are pinched together, and the mouth is closed with a mouth line.The manufacturing process of the metal mesh cage is simple, the manufacturing time and cost of a single mesh cage are low, and the loading capacity and utilization efficiency of the metal mesh cage are high.

Description

Technical Field

[0001] This invention belongs to the field of mineral engineering technology and relates to a method for manufacturing a metal mesh cage for iron ore vertical shaft furnace feeding test. Background Technology

[0002] my country has abundant iron ore resources, but most of them are difficult-to-process, low-grade iron ores. These difficult-to-process, low-grade iron ores contain a large amount of hematite, limonite, siderite, and their mixed ores. Due to their weak magnetic properties, conventional grinding-magnetic separation processes result in low-grade iron concentrates and low metal recovery rates, leading to significant waste of iron ore resources. However, by using high-temperature roasting to transform the hematite, limonite, and siderite in the iron ore into magnetite, which has stronger magnetic properties, and then using conventional grinding-magnetic separation processes, the iron grade and metal recovery rate of the iron concentrate can be greatly improved.

[0003] In the mining of refractory low-grade iron ore, both lumpy and powdered iron ore are extracted. Lumpy iron ore is typically magnetized and roasted in a vertical shaft furnace. However, during the magnetized roasting of one type of iron ore in a vertical shaft furnace, it is often necessary to conduct furnace charging tests on other types of refractory low-grade iron ore to verify the magnetized roasting, grinding, and magnetic separation characteristics of other types of iron ore in the furnace. This provides technical support for iron ore resource development and expanding the raw material sources for vertical shaft furnaces.

[0004] The iron ore shaft furnace charging test involves loading test iron ore into a specially designed metal mesh cage, which is then added to the shaft furnace along with the production iron ore through the top charging port. Under the high-temperature heating and reduction action of the shaft furnace, both the test and production iron ore undergo simultaneous magnetization roasting. After roasting, the material is discharged from the bottom of the shaft furnace and cooled in water. Finally, the metal mesh cage is retrieved from the cooled, room-temperature roasted material. The test roasted ore is then removed from the metal mesh cage and subjected to grinding and magnetic separation. Yield calculations and iron grade analysis are performed to obtain the technical indicators for the magnetic roasting of test iron ore in the shaft furnace.

[0005] When conducting iron ore cage feeding tests in a vertical shaft furnace, a specially designed metal mesh cage must first be manufactured. Figure 1The manufacturing process of the existing metal mesh cage is as follows: (1) Select a square metal mesh with a side length of 250-300mm, the mesh size is 10-15mm, the wire diameter is 0.3-0.5mm, and the material is ordinary iron wire; (2) Fold the square metal mesh along axis 1 from the lower right corner; (3) Fold the metal mesh along axis 2 from the lower left corner; (4) Fold the metal mesh along axis 3 from the upper left corner, and put the test iron ore into the mesh bag from the upper right corner opening of the folding bag; (5) Fold the metal mesh along axis 4 from the upper right corner; (6) Bundle the folded metal mesh cage containing iron ore with iron wire of 1-2mm diameter, and set the bundling line knot.

[0006] The main problems with the existing metal mesh cage manufacturing process are: (1) The metal mesh cage manufacturing process requires multiple folds, which makes the manufacturing process complicated; (2) The internal volume of the metal mesh cage is small, and the amount of ore loaded is small; (3) The metal mesh cage has a square structure, which is not conducive to the uniform flow of the metal mesh cage in the vertical furnace, which can easily cause deviations in the roasting quality; (4) The volume utilization efficiency of the metal mesh cage is low. Summary of the Invention

[0007] The purpose of this invention is to provide a metal mesh cage for iron ore shaft furnace feeding test and its manufacturing method, so as to solve the problems existing in the above-mentioned background art.

[0008] A metal mesh cage for iron ore vertical shaft furnace feeding test, the metal mesh cage is shaped like a pocket, and at least four pinch corners are provided at the top edge of the metal mesh cage. The four pinch corners are rotated inward in a clockwise or counterclockwise direction to close and bind together.

[0009] The mesh diameter of the metal wire mesh cage is less than 15mm.

[0010] The maximum diameter of the metal mesh cage is 70 mm.

[0011] The loading volume of the metal mesh cage shall not exceed 2 / 3 of its maximum volume.

[0012] The method for manufacturing the metal mesh cage for the iron ore shaft furnace charging test, as described above, includes the following steps:

[0013] (1) Select a square metal mesh with a side length of 250~300mm;

[0014] (2) A bowl-shaped mold is made by casting, with the inside of the bowl being larger at the top and smaller at the bottom;

[0015] (3) A gourd-shaped hammer is manufactured by casting. The gourd-shaped hammer consists of two parts: a hammer head and a hammer handle.

[0016] (4) Place the square metal mesh directly above the bowl-shaped mold;

[0017] (5) Hold the handle of the gourd-shaped hammer with your hand and place the hammer head down near the middle of the metal mesh;

[0018] (6) Press the hammer head on the middle of the metal mesh and move it downwards, so that the metal mesh will undergo plastic deformation under the positive pressure of the gourd-shaped hammer head, and the hammer head will drive the metal mesh to contact the bottom of the bowl-shaped mold.

[0019] (7) Take out the gourd-shaped hammer and the preliminarily pressed bag-shaped metal mesh cage from the bowl-shaped mold in sequence;

[0020] (8) Add the test iron ore into the pocket-shaped metal mesh cage, and pinch the four corners of the pocket-shaped metal mesh cage together in a clockwise or counterclockwise direction. Tie the opening of the pocket-shaped metal mesh cage with a binding wire.

[0021] The square metal mesh has a mesh size of 10-15mm, a wire diameter of 0.3-0.5mm, and is made of ordinary iron wire. Furthermore, the square metal mesh can withstand the high temperature of 1000℃ inside the vertical furnace and the mutual impact and friction between ores.

[0022] The height H inside the bowl-shaped mold is 80~100mm, the width W is 80~100mm, the thickness of the bowl wall is 8~10mm, and the material is cast steel or cast iron.

[0023] The gourd-shaped hammer consists of a hammer head and a hammer handle. The hammer handle is made of wood or metal tube with a diameter of 30-50mm and a length of 300-400mm. The hammer head is made of cast iron ball or steel ball with a diameter of 60-70mm. One end of the hammer handle is connected to the hammer head.

[0024] The iron ore used in the experiment was blocky iron ore with a particle size of 15-60mm.

[0025] The binding wire is ordinary iron wire with a diameter of 2-3mm.

[0026] The present invention has the following beneficial effects:

[0027] (1) The manufacturing process of the metal mesh cage of the present invention is simple, and the manufacturing time and cost of a single mesh cage are low, which creates conditions for specialized and mass production.

[0028] (2) The loading capacity and utilization efficiency of metal mesh cages are greatly improved;

[0029] (3) During the magnetization roasting process in the vertical furnace, the metal mesh cage has a uniform feeding speed and the roasting quality of the iron ore tested is high. Attached Figure Description

[0030] Figure 1This is a flowchart of the manufacturing process of a metal mesh cage in the prior art; wherein: a is a schematic diagram of the first fold of the metal mesh, b is a schematic diagram of the second fold of the metal mesh, c is a schematic diagram of the third fold of the metal mesh, d is a schematic diagram of the fourth fold of the metal mesh, e is a schematic diagram of loading the metal mesh after the third fold, f is a schematic diagram of the metal mesh after the fourth fold, and g is a schematic diagram of bundling the metal mesh cage after loading and folding.

[0031] Figure 2 This is a flowchart of the manufacturing process of the metal mesh cage of the present invention; wherein: a is a schematic diagram of the metal mesh placed above the bowl-shaped mold; b is a schematic diagram of the gourd-shaped hammer placed above the square metal mesh; c is a schematic diagram of the gourd-shaped hammer pressing vertically downward; d is a schematic diagram of the initially formed pocket-shaped metal mesh cage; e is a schematic diagram of the material being loaded into the initially formed pocket-shaped metal mesh cage; f is a schematic diagram of the metal mesh cage being tied at the opening.

[0032] Figure 3 The diagram shows the structure of a tool for making a metal mesh cage; where: a is a schematic diagram of a bowl-shaped mold, and b is a schematic diagram of a gourd-shaped hammer.

[0033] In the picture: 1-Metal mesh cage, 2-Pinch corner, 3-Bowl-shaped mold, 4-Gourd-shaped hammer. Detailed Implementation

[0034] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 2 and 3 As shown, the present invention discloses a method for manufacturing a metal mesh cage for iron ore vertical shaft furnace feeding test, comprising the following steps:

[0036] (1) Select a square metal mesh with a side length of 300mm, the mesh size of the square metal mesh is 12mm, the diameter of the mesh wire is 0.3mm, and the material is ordinary iron wire;

[0037] (2) A bowl-shaped mold is manufactured by casting. The height H inside the bowl-shaped mold is 90mm, the width W is 90mm, the thickness of the bowl wall is 8mm, and the material is cast iron.

[0038] (3) A gourd-shaped hammer is manufactured by casting. The handle is made of a metal tube with a diameter of 40 mm and a length of 300 mm. The hammer head is made of a solid cast iron ball or steel ball with a diameter of 70 mm.

[0039] (4) Place the square metal mesh directly above the bowl-shaped mold, hold the handle of the gourd-shaped hammer with your hand, and place the hammer head down close to the center of the square metal mesh;

[0040] (5) Press the hammer head on the middle of the square metal mesh and press it down, so that the square metal mesh will undergo plastic deformation under the positive pressure of the gourd-shaped hammer head, and the hammer head will drive the metal mesh to contact the bottom of the bowl-shaped mold.

[0041] (6) Take out the gourd-shaped hammer and the preliminarily pressed bag-shaped metal mesh cage from the bowl-shaped mold in sequence;

[0042] (7) Add the test iron ore into the sack-shaped metal mesh cage;

[0043] (8) Rotate the four corners of the pocket-shaped metal cage together in a clockwise or counterclockwise direction, and tie the opening with a tying wire. Tighten the opening of the pocket-shaped iron cage by tying the knot of the tying wire.

[0044] (9) The iron ore used in the test was blocky iron ore with a particle size of 15~60mm, and the binding wire was ordinary iron wire with a diameter of 2mm.

Claims

1. A method for manufacturing a metal mesh cage for iron ore shaft furnace feeding tests, characterized in that, Includes the following steps: (1) Select a square metal mesh with a side length of 250~300mm; (2) A bowl-shaped mold is made by casting, with the inside of the bowl being larger at the top and smaller at the bottom; (3) A gourd-shaped hammer is manufactured by casting. The gourd-shaped hammer consists of two parts: a hammer head and a hammer handle. (4) Place the square metal mesh directly above the bowl-shaped mold; (5) Hold the handle of the gourd-shaped hammer with your hand and place the hammer head down near the middle of the metal mesh; (6) Press the hammer head on the middle of the metal mesh and move it downwards, so that the metal mesh will undergo plastic deformation under the positive pressure of the gourd-shaped hammer head, and the hammer head will drive the metal mesh to contact the bottom of the bowl-shaped mold. (7) Take out the gourd-shaped hammer and the preliminarily pressed bag-shaped metal mesh cage from the bowl-shaped mold in sequence; (8) Add the test iron ore into the pocket-shaped metal mesh cage, and pinch the four corners of the pocket-shaped metal mesh cage together in a clockwise or counterclockwise direction. Tie the opening of the pocket-shaped metal mesh cage with a binding wire. The filling volume of the pocket-shaped metal mesh cage shall not exceed 2 / 3 of its maximum volume.

2. The method for manufacturing the metal mesh cage for the iron ore shaft furnace feeding test as described in claim 1, characterized in that: The square metal mesh has a mesh size of 10-15mm, a wire diameter of 0.3-0.5mm, and is made of ordinary iron wire.

3. The method for manufacturing the metal mesh cage for the iron ore shaft furnace feeding test as described in claim 1, characterized in that: The height H inside the bowl-shaped mold is 80~100mm, the width W is 80~100mm, the thickness of the bowl wall is 8~10mm, and the material is cast steel or cast iron.

4. The method for manufacturing the metal mesh cage for the iron ore shaft furnace charging test as described in claim 1, characterized in that: The gourd-shaped hammer consists of a hammer head and a hammer handle. The hammer handle is made of wood or metal tube with a diameter of 30-50mm and a length of 300-400mm. The hammer head is made of cast iron ball or steel ball with a diameter of 60-70mm. One end of the hammer handle is connected to the hammer head.

5. The method for manufacturing the metal mesh cage for the iron ore shaft furnace feeding test as described in claim 1, characterized in that: The iron ore used in the experiment was blocky iron ore with a particle size of 15-60mm.

6. The method for manufacturing the metal mesh cage for the iron ore shaft furnace feeding test as described in claim 1, characterized in that: The binding wire is ordinary iron wire with a diameter of 2-3mm.

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