CN107083481B

CN107083481B - Hard agglomeration pickling machine

Info

Publication number: CN107083481B
Application number: CN201710459038.9A
Authority: CN
Inventors: 白丽梅; 马玉新; 邢智博; 李鸣铎; 王东; 李萌; 邓玉芬
Original assignee: North China University of Science and Technology
Current assignee: North China University of Science and Technology
Priority date: 2017-06-16
Filing date: 2017-06-16
Publication date: 2023-05-12
Anticipated expiration: 2037-06-16
Also published as: CN107083481A

Abstract

The invention relates to a hard agglomeration acid leaching machine for leaching and grinding powder ore. The existing grinding and leaching equipment has the defects of hard agglomeration of mineral particles, low leaching rate, lack of a heat radiating device, no filtering system and the like. The invention is equipment which is used for evenly feeding ores, effectively preventing the acidification and hard agglomeration of the powder ores, has high leaching rate, is used for water cooling and heat dissipation, is provided with a dual heat dissipation system, and is simple and convenient to operate and maintain. The device comprises a feeding device, a stirring device, a grinding and leaching chamber, a filtering device, a water circulation system and a peristaltic pump. The invention can ensure that the circular ring shape is evenly fed with ore in the leaching process, the hard agglomeration phenomenon of the powder ore can not occur, the utilization rate of the powder ore is improved, the continuous uninterrupted reaction can be realized, the flow rate of acid is intelligently controlled, the double filtration system is adopted, the water cooling mode is adopted for heat dissipation, the equipment maintenance is convenient, and the service life is long.

Description

Hard agglomeration pickling machine

Technical Field

The invention relates to a device for leaching and grinding fine ores, in particular to a device for preventing hard agglomeration phenomenon in the process of acidification of the fine ores, which can be applied to the fields of mining, materials, metallurgy and the like.

Background

Carbonate minerals such as magnesite and dolomite, especially magnesite, are dominant resources in China, and the reserves of the carbonate minerals account for 1/4 of the reserves of the magnesite resources worldwide and account for the first place of the world. However, along with continuous exhaustion of high-quality resources, the high added value utilization of the carbonate mineral is required to be subjected to impurity removal, but the traditional physical impurity removal can not meet the requirement of the high added value on products, so that acidification impurity removal after calcination of magnesite is more and more focused by scientific researchers. The traditional ore grinding and leaching equipment gradually adds the powder ore into the solution for stirring, and filters after the reaction is completed, so that the problems that the ore is firstly ground and then leached in the past, and some target minerals are ground, so that unnecessary energy consumption is caused are solved. The process equipment shortens the grinding-leaching time, and timely leaches the exposed target minerals into the solution. However, for carbonate minerals such as magnesium oxide produced after calcination of magnesite, in order to increase the acid leaching rate, it is generally desirable that the magnesium oxide has high activity, but after the active magnesium oxide encounters an acid, aggregation hardening occurs rapidly, so that the internal magnesium oxide is prevented from further reacting with the acid, and meanwhile, the similar carbonate calcination products such as magnesium oxide react with the acid to release a large amount of heat, so that the conventional grinding and leaching machine cannot meet the condition that the acid leaching reaction which is easy to generate hard agglomeration and heat release is carried out at all.

When the leaching reaction of the mineral particles occurs, hard agglomeration phenomenon occurs at the moment of contact with the solution and a large amount of heat is released, and the hard agglomerated mineral is not easy to grind, so that the leaching efficiency is greatly reduced. The whole reaction flow has long time, low working efficiency, serious resource waste and poor safety coefficient. The existing tower mill or tower type mill-impregnator can not solve the problem that the mineral and the solution are hard agglomerated in the moment of contact due to the fact that the powder ore can not be fed uniformly, and the safety is poor due to the fact that a heat radiating device is lacked. Meanwhile, a filtering link is absent in the leaching process, fine solid mineral particles in the leaching solution cannot be recovered, the liquid flow rate is uneven, and the concentration fluctuation of the reaction solution is large. Because of the various problems associated with these devices and processes, their use is limited.

Disclosure of Invention

Aiming at the defects of the grinding and leaching equipment and the process, the invention adopts the method that the powder ore is fed for preliminary wetting and dispersing, and then the powder ore is fed annularly and uniformly, so that the hard agglomeration phenomenon of particles is avoided greatly; heat in the reaction process is dissipated by a water circulation system, and in consideration of abrasion of mineral particles to the heat dissipation plate, inclined turbulence plates are arranged at the positions of the corresponding holes of the abrasion-resistant lining plates, so that the flow direction of ore pulp is changed while particles are reduced to enter the inside, and the abrasion to the heat dissipation plate is weakened; the leachate which is completely reacted may contain a small amount of fine particles, so that a double filtration system is adopted to ensure that the leachate does not contain mineral particles.

The invention adopts the following technical scheme.

A hard agglomeration acid soaking machine comprises a feeding device, a stirring device, a grinding and soaking chamber, a filtering device, a water circulation system and a peristaltic pump.

The ore feeding device comprises a disc ore feeding machine, a dispersing water pipe, a dispersing chamber, a sieve pore base and a vertical baffle, wherein the powder ore is fed through the disc ore feeding machine, is preliminarily wetted in the dispersing chamber and is stirred into ore pulp with uniform concentration, the dispersed ore pulp is uniformly fed into the grinding and leaching chamber through the sieve pore base, the reaction moment of the powder ore and acid can be effectively reduced, and the hard agglomeration phenomenon of the agglomeration of particles can be effectively reduced. The vertical baffle can prevent the ore pulp from being shunted and blocked the annular screen mesh in the ore feeding process.

The stirring device consists of a fan blade stirring rod, a spiral stirring rod, a sieve pore tray and a braking motor, wherein the fan blade stirring rod and the sieve pore tray are cast into a whole, and simultaneously rotate under the action of the braking motor. The fan blade stirring rod penetrates through the sieve mesh base and is connected with the spiral stirring rod, the sieve mesh base and the dispersing chamber are fixed into a whole, the diameter of the sieve mesh tray is slightly smaller than that of the sieve mesh base, the sieve mesh positions, the sizes and the distribution of the sieve mesh base and the sieve mesh tray are completely consistent, the spiral stirring rod in the grinding and leaching chamber rotates to drive the ceramic balls to do longitudinal and transverse movement, the grinding and leaching reaction process of powder ore is realized, and the hard agglomeration phenomenon of particles is eliminated.

The grinding and leaching chamber consists of a round table-shaped cylinder body with thick upper part and thin lower part, a wear-resistant lining plate with holes and a turbulent flow plate, wherein the concentration of the lower part of the round table-shaped cylinder body is high, so that ore grinding is facilitated, the area of the upper part is large, and the concentration of powder particles is small, so that the powder particles are facilitated to enter. The wear-resistant lining plate is in hemispherical chain connection, and a hole is formed in the middle of the wear-resistant lining plate to prevent large particles from entering the inner layer and wearing the heat dissipation plate. The stirred ore pulp vertically passes through the holes, changes the flow direction through the turbulent plate, and reduces the abrasion to the radiating plate. The ceramic balls are combined with the hemispherical liner, so that a small amount of hard agglomerated particles which are strong to appear can be ground and reacted with acid again. The bottom of the cylinder body is provided with an access hole, so that the periodic inspection and repair are convenient, and unreacted impurity particles are discharged.

The filtering device consists of an annular screen, an inclined overflow groove, an overflow pipe, a storage chamber, a vacuum filter, a product chamber and a slag groove, wherein the annular screen is arranged at the position of the overflow port, coarse filtration is carried out to remove large-particle minerals, and the angle of the screen surface is inclined so as to avoid blocking screen holes. The inclined overflow groove accelerates the leaching liquid to flow into the storage chamber, and the two vacuum filters work alternately to filter out fine particles. The bottom screening surface can be opened to discharge the filter residue in the slag bath.

The water circulation system takes away a large amount of heat released by the reaction, reduces equipment loss and increases the safety coefficient.

The peristaltic pump can control the feeding speed of the acid solution, and is beneficial to removing impurities by creating an environment with excessive powder ore. The inflow port is positioned below the turbulent flow plate, and dissolves and leaches particles which are blocked by the pores of the wear-resistant lining plate due to long-term operation.

Compared with the prior art, the invention adopting the technical scheme has the advantages that the disc feeder evenly feeds ores, the powder ores are initially wetted and stirred in the dispersion chamber, and evenly fed into the grinding and leaching chamber through double-layer sieve holes, so that the phenomenon of hard agglomeration in the moment of contact between the powder ores and acid is reduced. In the grinding and leaching chamber, the stirring rod drives the ceramic balls to move, so that a small amount of hard agglomerated particles in the reaction filtration are eliminated, and useful minerals are completely leached out. The heat released in the reaction process is discharged through the water circulation system, so that the operation safety is ensured. The angle design of annular screen cloth and slope overflow launder quickens the velocity of flow, avoids the granule to block up. The vacuum filter and the annular screen mesh form a double-filtering system, so that no mineral particles exist in the leaching solution, the leaching rate is high, the maintenance is convenient, and the service life is long.

Drawings

FIG. 1 is a schematic front view of a hard agglomeration pickling machine.

FIG. 2 is a view of the A-A side of the hard agglomerate acid pickling machine.

FIG. 3 is a B-B side sectional view of the hard agglomerate acid impregnator.

Detailed Description

The invention is described in detail below with reference to the drawings and examples.

A hard-agglomeration acid leaching machine comprises a mineral feeding device 4, a stirring device 22, a grinding leaching chamber 23, a filtering device 25, a water circulation system 12 and a peristaltic pump 24.

The feeding device 4 is composed of a disc feeding machine 1, a dispersing water pipe 2, a dispersing chamber 21, a sieve pore base 6 and a vertical baffle 9, wherein the dispersing chamber 21 and the sieve pore base 6 are integrated, and the disc feeding machine 1 and the dispersing water pipe 2 are placed on two sides of the dispersing chamber 21.

The stirring device 22 consists of a fan blade stirring rod 28, a spiral stirring rod 13, a sieve pore tray 5 and a braking motor 3, wherein the braking motor 3 is positioned at the top of the dispersion chamber 21, the fan blade stirring rod 28 is positioned in the dispersion chamber 21, the spiral stirring rod 13 is positioned in the grinding and soaking chamber 23, the sieve pore tray 5 is positioned on the sieve pore base 6, the welding is carried out on the fan blade stirring rod 28, and the braking motor 3 drives the stirring device to rotate simultaneously with the fan blade stirring rod 28.

The grinding and soaking chamber 23 consists of a round table-shaped cylinder 26 with thick upper part and thin lower part, a wear-resistant lining plate 10 with holes and a turbulent flow plate 11, wherein the wear-resistant lining plate 10 is arranged at the innermost layer of the round table-shaped cylinder 26, the grinding roughness is increased, the turbulent flow plate 11 is arranged between the wear-resistant lining plate 10 and the water circulation system 12, the flowing direction of ore pulp is changed, and the abrasion of the heat dissipation plate 27 is reduced. The round table type cylinder 26 is internally provided with a wear-resistant and corrosion-resistant ceramic ball 14, and the bottom is provided with an access hole 15.

The filtering device 25 consists of an annular screen 7, an inclined overflow groove 8, an overflow pipe 16, a storage chamber 17, a vacuum filter 18, a product chamber 19 and a slag groove 20, wherein the annular screen 7 and the inclined overflow groove 8 are arranged above the grinding and leaching chamber 23 and are connected with the storage chamber 17 through the overflow pipe 16, the upper part of the vacuum filter 18 is connected with the storage chamber 17, the lower part of the vacuum filter is connected with the product chamber 19, and the slag groove 20 is arranged below the vacuum filter 18.

The peristaltic pump 24 is positioned at the bottom of the circular truncated cone-shaped cylinder 26 and controls the feeding speed of the acid solution.

The dispersing water pipe 2 starts to be filled with water, the powder ore is fed into the dispersing chamber 21 by the disc feeder 1, the braking motor 3 is turned on, the fan blade stirring rod 28 and the spiral stirring rod 13 are started simultaneously, and the peristaltic pump 24 controls the flow to add acid. The powder ore in the dispersion chamber 21 is primarily moistened, the powder ore is uniformly mixed under the action of the fan blade stirring rod 28, ore pulp is fed into the grinding and leaching chamber 23 when the sieve holes of the sieve hole tray 5 and the sieve hole base 6 are overlapped and reacts with acid, thus intermittent ore feeding can control the flow rate of the ore pulp in the dispersion chamber 21, the vertical baffle 9 prevents the ore pulp fed into the grinding and leaching chamber 23 from being split, the annular ore feeding is used for controlling the ore feeding position, and the phenomenon of particle hard agglomeration can be effectively reduced between the ore and the acid reaction instant.

The ore pulp is continuously reacted with acid in the grinding and leaching chamber 23, and agglomerated small particles generated in the reaction process are gradually ground by driving the ceramic balls 14 to move vertically and horizontally through the spiral stirring rod 13 and continuously react with the acid. The reaction releases a large amount of heat, and is discharged through the water circulation system 12, the wear-resistant lining plate 10 is adopted to avoid large particles from entering the inside, the heat dissipation plate 10 is worn, ore pulp flows in perpendicular to the wear-resistant lining plate 10, the flow direction is changed through the blocking effect of the turbulence plate 11, and the ore pulp enters the water circulation system 12, so that the wear of the heat dissipation plate 27 is reduced.

The leaching solution after complete reaction is subjected to rough filtration through the annular screen 7, enters the storage chamber 17 through the inclined overflow groove 8 and the overflow pipe 16, is fed into the vacuum filter 18 for fine filtration, finally flows into the product chamber 19, and slag remained on the screen surface at the bottom of the vacuum filter 18 is discharged into the slag groove 20, and the two vacuum filters 18 alternately operate to ensure that the leaching process is uninterrupted.

The bottom access hole 15 of the cylinder is used for regular maintenance of equipment, the whole reaction process is continuously carried out, slag which cannot react exists in the grinding and leaching chamber 23 after the equipment is used for a certain period of time, and the equipment can be stopped to be discharged from the access hole 15, so that 2 pieces of equipment are needed for alternate work in actual continuous production line operation.

Claims

1. The utility model provides a hard agglomeration acid pickling machine, includes ore device, agitating unit, mill leaching room, filter equipment, water circulation system and peristaltic pump, its characterized in that: the ore feeding device consists of a disc ore feeder, a dispersion water pipe, a dispersion chamber, a sieve pore base and a vertical baffle plate, wherein the dispersion chamber and the sieve pore base are integrated, and the disc ore feeder and the dispersion water pipe are arranged at two sides of the dispersion chamber; the stirring device consists of a fan blade stirring rod, a spiral stirring rod, a sieve pore disc and a braking motor, wherein the braking motor is positioned at the top of the dispersion chamber, the fan blade stirring rod is positioned in the dispersion chamber, the spiral stirring rod is positioned in the milling and soaking chamber, the sieve pore disc is positioned above the sieve pore base and is welded on the fan blade stirring rod, and the braking motor drives the two stirring rods and the sieve pore disc to simultaneously rotate so as to realize the simultaneous working of the dispersion chamber and the milling and soaking chamber; the grinding and soaking chamber consists of a round table-shaped cylinder body with thick upper part and thin lower part, a wear-resistant lining plate with holes and a turbulent flow plate, wherein the wear-resistant lining plate is arranged at the innermost layer of the round table-shaped cylinder body, the turbulent flow plate is arranged between the wear-resistant lining plate and a water circulation system, a wear-resistant and corrosion-resistant ceramic ball is arranged in the cylinder body, and an overhaul port is arranged at the bottom of the cylinder body; the filtering device consists of an annular screen, an inclined overflow tank, an overflow pipe, a storage chamber, a vacuum filter, a product chamber and a slag tank, wherein the annular screen and the inclined overflow tank are arranged above the grinding and leaching chamber and are connected with the storage chamber through the overflow pipe, the upper part of the vacuum filter is connected with the storage chamber, the lower part of the vacuum filter is connected with the product chamber, and the slag tank is arranged below the vacuum filter; the vertical baffle is fixed inside the annular screen.

2. The hard-wired pickling machine according to claim 1, characterized in that: the sieve mesh tray is closely contacted with the upper and lower positions of the sieve mesh base, and the sieve mesh size and the distribution density of the sieve mesh tray are the same as those of the sieve mesh base.

3. The hard-wired pickling machine according to claim 1, characterized in that: the fan blade stirring rod and the sieve pore tray are cast into a whole, pass through the sieve pore base, are connected with the spiral stirring rod, coaxially rotate, and the sieve pore base is fixed at the bottom of the dispersion chamber and is fixed, and the braking motor drives the two stirring rods and the sieve pore tray to simultaneously rotate.

4. The hard-wired pickling machine according to claim 1, characterized in that: the wear-resistant lining board in the grinding and soaking chamber adopts a hemispherical chain link, a hole is arranged between two adjacent rows of hemispheres, a turbulence plate is arranged in the wear-resistant lining board corresponding to each hole, and the turbulence plate changes the flow direction of ore pulp.

5. The hard-wired pickling machine according to claim 1, characterized in that: the annular screen is inclined inwardly.

6. The hard-wired pickling machine according to claim 1, characterized in that: the peristaltic pump flow inlet is positioned below the turbulence plate.