Search

CN-117778709-B - Device and method for sulfating roasting of ore

CN117778709BCN 117778709 BCN117778709 BCN 117778709BCN-117778709-B

Abstract

The invention provides a sulfating roasting device and method of ores, and relates to the technical field of hydrometallurgy. The ore sulfating roasting device provided by the invention is used for sulfating roasting of ore, and the process control such as the design of the functional structure of the pulping tank 3, the sectional batch addition of materials and the like is adopted, so that the pulping time is shortened, the pulping efficiency is improved, and the risk of 'groove overflow' of ore pulp is reduced. The process and equipment structural designs of multi-point feeding, mixing of a large amount of high-temperature dry materials and wet materials and the like are comprehensively adopted, so that the rapid solidification of materials in a slurry solidification device is realized, and the technical problems of large conveying of sulfated roasting external circulation returned materials and large power and heat consumption are solved. The high-temperature tail gas generated by the rotary kiln is used for the slurry rapid solidification process, so that the cascade utilization of energy is realized, the heat utilization efficiency is improved, the total energy consumption and the production cost of sulfating roasting of ores are reduced, the amount of waste gas is reduced, and the method is suitable for industrial production.

Inventors

  • LIU HUIWU
  • XIANG QIULIN
  • SU XUEBIN
  • Liang Gengyu
  • CHENG HAO
  • WANG GUISHUO
  • LI CHUNFENG
  • ZHANG CHEN
  • LIU ZHONGCHEN
  • LIU KANG

Assignees

  • 核工业北京化工冶金研究院

Dates

Publication Date
20260512
Application Date
20231228

Claims (8)

  1. 1. A sulfatizing roasting device of ore, comprising: a metering screw conveyor (2); The device comprises a pulping tank (3) communicated with an outlet of a metering screw conveyor (2), wherein the pulping tank (3) comprises a stirring tank, a stirrer and an acid spraying system (3-3) are arranged in the stirring tank, the stirrer comprises a stirring shaft, an I-shaped paddle () 3-1 connected with the top of the stirring shaft and a propeller (3-2) connected with the bottom of the stirring shaft, a mineral powder inlet and an acid feeding pipe are arranged at the top of the pulping tank (3), the acid feeding pipe is communicated with the acid spraying system (3-3), a slurry outlet is arranged at the bottom of the pulping tank (3), and a first valve (9) is arranged on the acid feeding pipe; The slurry curing device (5) is communicated with a slurry outlet of the slurry making tank (3), the slurry curing device (5) comprises a barrel (5-1) and a stirring device (5-2) arranged in the barrel (5-1), the stirring device comprises two hollow shafts and two hollow paddles rotating reversely, the slurry curing device (5) is further provided with a feeding pipe (5-3), a discharging pipe (5-4) and an air inlet (5-5), more than 3 discharging holes are formed in the feeding pipe (5-3), the number of the discharging holes formed in the feeding pipe (5-3) is 3-5, the feeding pipe (5-3) is horizontally arranged in the slurry curing device (5), and the discharging pipe (5-4) of the slurry curing device (5) is communicated with a feeding hole of the rotary kiln (7) through a screw conveyer (6); The rotary kiln (7) is communicated with the discharging pipe (5-4), the rotary kiln (7) is provided with a feeding port, a clinker outlet and a roasting tail gas outlet, and the roasting tail gas outlet is communicated with the air inlet (5-5).
  2. 2. The sulfatizing roasting device of claim 1, wherein the aspect ratio of the pulping tank (3) is 2-3.5:1; the diameter ratio of the propeller (3-2) to the stirring tank is 0.3-0.5:1; The ratio of the height of the I-shaped paddle (3-1) to the height of the material in the stirring tank is 0.3-1:1, the ratio of the length of the I-shaped paddle (3-1) to the diameter of the stirring tank is 0.6-0.8:1, and the distance between the installation height of the I-shaped paddle (3-1) and the top of the stirring tank is 0.3-0.5 m.
  3. 3. The sulfating roasting device according to any one of claims 1-2, characterized in that a second valve (10) and a feed pump (4) are arranged on a pipeline communicated between a slurry outlet of the pulping tank (3) and the feed pipe (5-3).
  4. 4. The sulfatizing roasting device of claim 1, wherein the roasting exhaust gas outlet of the rotary kiln (7) is communicated with the gas inlet (5-5) of the slurry solidifying device (5) by means of a high temperature fan (8).
  5. 5. A method for sulfatizing roasting of ore, characterized by comprising the following steps by using the sulfatizing roasting device of any one of claims 1 to 4: Adding a first part of concentrated sulfuric acid into a pulping tank (3) through an acid spraying system (3-3) by an acid feeding pipe, adding mineral powder into the pulping tank (3) through a mineral powder inlet by a metering screw conveyor (2) under a first stirring condition, and simultaneously adding a second part of concentrated sulfuric acid through the acid spraying system (3-3), wherein after the mineral powder is added, adding the rest concentrated sulfuric acid through the acid spraying system (3-3), stirring and mixing to obtain slurry; delivering the slurry to a slurry curing device (5), and curing under a second stirring condition to obtain a cured material; The solidified material enters a rotary kiln (7) through a discharging pipe (5-4) to be sulfated and roasted to obtain ore sulfated and roasted material and roasting tail gas respectively, and the roasting tail gas is conveyed to a slurry solidifying device (5) to be recycled for the solidifying step.
  6. 6. The method according to claim 5, wherein the mass ratio of the mineral powder to the total amount of concentrated sulfuric acid is 1:0.8-2; The first part of concentrated sulfuric acid accounts for 50-80% of the total mass of the total concentrated sulfuric acid, the second part of concentrated sulfuric acid accounts for 10-40% of the total mass of the total concentrated sulfuric acid, and the residual concentrated sulfuric acid accounts for 10-25% of the total mass of the total concentrated sulfuric acid; the mass concentration of the concentrated sulfuric acid is 90-98%; the feeding time of the mineral powder is 10-40 min; The adding time of the residual concentrated sulfuric acid is 5-20 min; the rotating speed of the first stirring condition is 350-600 rpm; The stirring and mixing time is 5-20 min, and the stirring speed is 350-600 rpm.
  7. 7. The method according to claim 5, characterized in that the slurry curing device (5) has a temperature of 180-260 ℃ and a curing time of 3-20 min; and adding the slurry into the slurry curing device (5) and curing the dry materials in the slurry curing device (5) at a mass ratio of 0.1-0.4:1.
  8. 8. The method according to claim 5, wherein the sulfatizing roasting temperature is 250-500 ℃ and the time is 0.5-4 hours.

Description

Device and method for sulfating roasting of ore Technical Field The invention relates to the technical field of hydrometallurgy, in particular to a device and a method for sulfating roasting of ores. Background At present, the mixed rare earth concentrate treatment process applied in industry is a sulfuric acid method and a caustic soda method. The caustic soda process has high operation cost, is difficult to produce on a large scale, has high requirements on concentrate grade, and only 10% of Baotou ores adopt the process. At present, a high-temperature sulfuric acid roasting method, namely a third-generation acid method is commonly adopted, and a used device is an internal heating rotary kiln, so that the method has low production cost, is widely applied in recent years, and achieves certain economic benefit. However, the internal heating rotary kiln can cause scarring and ring formation at the feeding end, which results in discontinuous production. In order to solve the problems, chinese patent CN111411219A discloses a low-temperature acidification roasting method and device for rare earth concentrate, which adopts an external constant-temperature mixer to mix materials, then adds the mixed materials into a rotary acidifier to carry out acidification reaction, and returns a part of rare earth acidification clinker generated by the acidification reaction to the feeding end of the indirect rotary acidifier through an acidification clinker reverse conveying structure to be mixed with mixed acid raw materials, thereby solving the phenomena of scarring and looping of the feeding end of a cylinder body. However, the prior art still adopts rotary acidification equipment, is limited by the loading amount of the equipment, and has low equipment processing capacity, and adopts external circulation type material returning, so that the material conveying amount is large, and the power and heat consumption is large. Disclosure of Invention In view of the above, an object of the present invention is to provide an apparatus and a method for sulfating and roasting ores. The sulfating roasting device provided by the invention is used for sulfating roasting of ores, has low energy consumption and large treatment capacity, does not generate a phenomenon of 'groove overflow' in the ore pulping process, and solves the technical problems of large material conveying and large power and heat consumption of sulfating roasting external circulation returning materials. In order to achieve the above object, the present invention provides the following technical solutions: The invention provides a sulfating roasting device of ores, comprising: a metering screw conveyor 2; The pulping tank 3 is communicated with the outlet of the metering screw conveyor 2, the pulping tank 3 comprises a stirring tank, a stirrer and an acid spraying system 3-3 are arranged in the stirring tank, the stirrer comprises a stirring shaft, an I-shaped propeller 3-1 connected with the top of the stirring shaft and a propeller 3-2 connected with the bottom of the stirring shaft, a mineral powder inlet and an acid feeding pipe are arranged at the top of the pulping tank 3, the acid feeding pipe is communicated with the acid spraying system 3-3, a slurry outlet is arranged at the bottom of the pulping tank 3, and a first valve 9 is arranged on the acid feeding pipe; The slurry curing device 5 is communicated with a slurry outlet of the pulping tank 3, the slurry curing device 5 comprises a cylinder 5-1 and a stirring device 5-2 arranged in the cylinder 5-1, the stirring device comprises two hollow shafts and two hollow paddles rotating reversely, the slurry curing device 5 is also provided with a feeding pipe 5-3, a discharging pipe 5-4 and an air inlet 5-5, and more than 3 discharging holes are arranged on the feeding pipe 5-3; The rotary kiln 7 is communicated with the discharging pipe 5-4, the rotary kiln 7 is provided with a feeding port, a clinker outlet and a roasting tail gas outlet, and the roasting tail gas outlet is communicated with the air inlet 5-5. Preferably, the height-to-diameter ratio of the pulping tank 3 is 2-3.5:1; The diameter ratio of the propeller 3-2 to the stirring tank is 0.3-0.5:1; The ratio of the height of the I-shaped paddle 3-1 to the height of the material in the stirring tank is 0.3-1:1, the ratio of the length of the I-shaped paddle 3-1 to the diameter of the stirring tank is 0.6-0.8:1, and the distance between the installation height of the I-shaped paddle 3-1 and the top of the stirring tank is 0.3-0.5 m. Preferably, the number of the discharge holes arranged on the feeding pipe 5-3 is 3-5, and the feeding pipe 5-3 is horizontally arranged in the slurry curing device 5. Preferably, a second valve 10 and a feed pump 4 are arranged on a pipeline communicated between the slurry outlet of the pulping tank 3 and the feed pipe 5-3. Preferably, the discharging pipe 5-4 of the slurry solidifying device 5 is communicated with the fee