CN-118850565-B - Process for storing wet sand by negative pressure water pumping type silo

CN118850565BCN 118850565 BCN118850565 BCN 118850565BCN-118850565-B

Abstract

The invention discloses a negative pressure water pumping type silo wet sand storage process, which is characterized in that prepared or separated wet sand with the water content of more than or equal to 13.5% is conveyed into a vertical silo for storage, gravity water draining is carried out by means of a gravity field, gravity descending capillary water flows rapidly descend to the middle and lower parts of the silo under the action of the vertical gravity field, a water-avoiding ring is arranged at the bottom of the silo, the water-avoiding ring collects all descending capillary water flows, the capillary water stored at the bottom of the silo is isolated outside a sand discharge port, redundant water outside fine sand, superfine sand and tail sand combined water is separated, a water-capillary penetrating zone is formed by arranging a water-air mixing sleeve in the region, the water-capillary mixing sleeve is connected to a jet negative pressure water pumping device through a main pipe, and finally water-capillary qualified sand with the water content of less than 10% is obtained, the water-capillary qualified sand is close to the natural combined water content of fine sand, superfine sand, tail sand and the like, and the problem of leakage in the transportation process is completely eradicated.

Inventors

HU FOMING
WU HAOJUN
LV YONGMING
SHEN YANG
ZHANG HEJIAN
ZHANG JUN
SHEN YUANHAI
WANG SHAOPING
LI ZHONGWEN
HU CHENG
WU GUOJUN
WANG CHUANLONG
YIN HUIHAI
JIANG HONG

Assignees

安徽马钢矿业资源集团南山矿业有限公司
安徽马钢矿业资源集团有限公司

Dates

Publication Date: 20260505
Application Date: 20240716

Claims (8)

1. The negative pressure water pumping type silo wet sand storage process is characterized by comprising the following steps of: S1, conveying prepared or separated fine sand, ultrafine sand and wet sand with the tail sand water content of more than or equal to 13.5% into a vertical silo (1) for storage; s2, carrying out gravity drainage on the wet sand in a bin storage form in the vertical silo (1) obtained in the S1 by means of a gravity field; s3, rapidly descending capillary water flow which is downwards caused by gravity to the middle lower part of the silo (1) under the action of a vertical gravity field of the differential height wet sand stockpile body which is obtained in the S2 and is drained under the gravity field; S4, projecting capillary water flow which is obtained in the S3 and descends to the middle lower part of the silo (1) to the bottom plane of the silo (1), arranging a sand discharge port (2) in the middle of the plane, and arranging a water-avoiding frame (3) around the sand discharge port (2) in a circle; S5, collecting all descending capillary water flows by the water-avoiding frame (3) in the S4, and isolating the capillary water stored at the bottom of the silo (1) outside the sand discharge port (2) to separate out redundant water outside the combined water of fine sand, ultra-fine sand and tail sand; s6, arranging a group of air-water mixing sleeves (4) in each square meter of the collected capillary water obtained in the step S5 to form a capillary water penetration area; And S7, all the air-water mixing sleeves (4) in the step S6 are connected to a main pipe (5) with the pipe diameter sectional area larger than the sum of the pipe diameter sectional areas of all the air-water mixing sleeves, the main pipe (5) is connected to a jet negative pressure pumping device for negative pressure pumping operation, and capillary water and qualified water sand with the water content smaller than 10% are obtained.
2. The negative pressure water pumping type silo wet sand storage process according to claim 1 is characterized in that a water avoiding frame (3) arranged in the S4 is a square baffle plate with the height of 40cm inside a silo bottom sand discharge port (2) area, and an annular wet sand belt with the high water content is formed with the inner wall of the silo bottom.
3. The process for storing wet sand in the negative pressure water pumping type silo according to claim 1, wherein the total length of the air-water mixing sleeve (4) arranged in the S6 is 40cm, and four layers of water permeable devices are arranged from outside to inside, namely a first layer of metal mesh (41), a second layer of round hole steel pipes (42), a third layer of filter cloth (43) and a fourth layer of strip hole steel pipes (44).
4. The negative pressure water pumping type silo wet sand storage process according to claim 3 is characterized in that the metal net (41) is an 80-mesh stainless steel net, round hole steel pipes (42) are steel pipes with the diameter of 100mm, round holes with the diameter of 5mm are formed in the pipe walls, the interval between the round holes is 2.5mm, filter cloth (43) is non-woven fabrics with the specification of 200g/m & lt 2 & gt, strip hole steel pipes (44) are steel pipes with the diameter of 80mm, strip holes with the length directions of 3 mm or 20mm are formed in the pipe walls, the long side directions of the strip holes are in radial agreement with those of the strip hole steel pipes (44), the interval between the long sides of each strip hole is 2.5mm, and the interval between the short sides of each strip hole is 3.5mm.
5. A process for storing wet sand in a negative pressure water pumping type silo according to claim 3, wherein the bottom of the air-water mixing sleeve (4) is provided with a pipeline connection port (45) connected with the main pipe (5).
6. The negative pressure water pumping type silo wet sand storage process according to claim 1 is characterized in that the upper end of the silo (1) is a dome (9), a feed inlet (10) is arranged in the center of the dome (9), the lower end of the silo (1) is an inverted cone bottom (11), and the feed inlet (10), the dome (9) and the inverted cone bottom (11) form a vertical space structure in the silo (1) from top to bottom.
7. The negative pressure water pumping silo wet sand storage process of claim 1, wherein the jet negative pressure water pumping device in S7 comprises a buffer tank (7) and a jet vacuum sleeve (8), wherein an air inlet main pipeline (71), an air outlet pipe (72), a pressure gauge (73) and a tank body (74) are arranged on the buffer tank (7), the jet vacuum sleeve (8) comprises an air inlet (81), a jet pipe (82), an air outlet (83), a water pump (84), a steady flow box outlet (85), a water outlet (86), a steady flow box (87), a liquid level control plate (88) and a defoaming box (89), the front end of the air inlet (81) is connected with the water pump (84) and the air outlet pipe (72), the rear end of the air inlet (81) is connected with the jet pipe (82), the rear end of the air outlet (83) is connected with the defoaming box (89), the defoaming box (89) is connected with the steady flow box (87) in parallel, the middle is isolated by the liquid level control plate (88), the space above the top of the liquid level control plate (88) is communicated, the top of the defoaming box (89) is connected with the water outlet (86), the steady flow box (85) is connected with the steady flow box (85), the rear end of the steady flow box outlet (85) is connected with a water pump (84).
8. The process for storing wet sand in the negative pressure water pumping type silo according to claim 7, wherein the water pump (84) used in the negative pressure water pumping operation of the jet negative pressure water pumping device is a jet vacuum pump, the pumping capacity is more than or equal to 200m 3 /h, and the vacuum degree is more than or equal to 0.04MPa.

Description

Process for storing wet sand by negative pressure water pumping type silo Technical Field The invention relates to the technical field of mineral processing engineering, in particular to a negative pressure water pumping type silo wet sand storage process. Background A large number of concentrating mills are operated in China, a large amount of tailings are discharged annually, tailings are separated from the tailings to serve as aggregate of the sand for construction, and the tailings are an effective supplementary approach, and are viable strategies for reducing the tailings discharge and further prolonging the service life of a tailings pond, so that the recycling of tailings resources to supplement the market demands of the sand becomes common. But the tailings are simply separated from the tailings and transported to all concrete mixing stations or other demand parties in a steam transportation and sales mode, the conditions of casting along the way, running, leaking, and the like caused by high moisture often occur, the environment protection requirement is not met, and finally, the problems of going on the way are solved, and the sales and the production are affected. Aiming at the problems that the water content is higher after the preparation or separation of stones, coarse sand, fine sand, ultra-fine sand, tailing sand and the like in the related art, and the normal transportation, sales and production are affected. At present, related patents exist in the technical field of sand silo engineering stirring stations and transfer fields, for example, patent grant publication number CN219952157U, and patent application patents entitled sand rapid drainage hardening structure and sand silo disclose a sand silo bottom plate, a longitudinal drainage ditch, a transverse drainage ditch and a communication device thereof, and the problem of higher water content of machine-made sand is solved. However, the technology can only treat coarse sand, and the device structure is too simple, and only depends on the principle of natural draining, when fine sand or tailing sand is treated, as the specific surface area of the fine sand or ultrafine sand is too large, the surface moisture is difficult to quickly descend, and under the condition of natural gravity draining, the draining time needs 15 days, so that the moisture of more than 85% of sand can be reduced to be within 10%, and stable transportation is ensured. Therefore, a treatment technology matched with fine sand, superfine sand or tailing storage is urgently needed, and development of a negative pressure water pumping type silo wet sand storage technology is very necessary. Disclosure of Invention The invention aims to provide a negative pressure water pumping type silo wet sand storage process, which adopts a negative pressure water pumping process to quickly reduce the moisture of fine sand, superfine sand or tailing sand, ensure stable warehouse storage and normal steam transportation and sales, and solve the problems that the existing fine sand, superfine sand or tailing sand is thrown along the way, is leaked out and drips due to high moisture, does not meet the environmental protection requirement, and finally cannot go on the way. In order to achieve the purpose, the invention provides the following technical scheme that the process for storing wet sand by using the negative pressure water pumping type silo comprises the following steps: S1, conveying prepared or separated fine sand, ultrafine sand and wet sand with the tail sand water content of more than or equal to 13.5% into a vertical silo for storage; s2, carrying out gravity drainage on the wet sand in a bin storage form in the vertical silo obtained in the S1 by means of a gravity field; S3, rapidly descending capillary water flow which is downwards caused by gravity to the middle lower part of the silo under the action of a vertical gravity field of the differential height wet sand stockpile body which is obtained in the S2 and is drained under the gravity field; s4, projecting capillary water flow which is obtained in the S3 and descends to the middle lower part of the silo to the plane of the bottom of the silo, wherein a sand discharge port is arranged in the middle of the plane, and a water-avoiding frame is arranged around the sand discharge port in a circle; s5, collecting all descending capillary water flows by the water-avoiding frame in S4 and isolating the capillary water stored at the bottom of the silo outside the sand discharge port, and separating out redundant water outside the water combined by fine sand, ultra-fine sand and tail sand; S6, arranging a group of air-water mixing sleeves in each square meter of the collected capillary water obtained in the step S5 to form a capillary water penetration area; and S7, connecting all the air-water mixing sleeves in the step S6 to a main pipe with the pipe diameter section area larger than the sum of the pipe diameter section areas