CN213011970U

CN213011970U - Device for co-producing iron ore concentrate by using pyrite to produce acid

Info

Publication number: CN213011970U
Application number: CN202021613209.2U
Authority: CN
Inventors: 徐攀; 邹成; 王新军
Original assignee: Shenyang Xinbo Industrial Technology Co ltd
Current assignee: Shenyang Xinbo Industrial Technology Co ltd
Priority date: 2020-08-05
Filing date: 2020-08-05
Publication date: 2021-04-20
Anticipated expiration: 2030-08-05

Abstract

The invention belongs to the technical field of acid making and sulfuric acid residue resource utilization, and particularly relates to a device for co-producing iron ore concentrate by using pyrite to make acid. The device can carry out thermal state magnetization reduction on the generated sulfuric acid residue while preparing acid, so that the sulfuric acid residue can be utilized by magnetic separation, the full utilization of resources is realized, and the influence on the ecological environment is reduced. The device mainly comprises a fluidized bed roaster, a magnetizing reduction furnace, a waste heat boiler, a cyclone dust collector and an electric dust collector. Flue gas generated by roasting pyrite in a fluidized bed furnace is treated by a waste heat boiler, a cyclone dust collector and an electric dust collector and then enters an acid making process, simultaneously generated high-temperature sulfuric acid slag enters a magnetization reduction furnace through discharge ports or slag discharge ports of the devices, and sensible heat of the sulfuric acid slag is utilized to enable air entering the magnetization reduction furnace to react with a carbonaceous reducing agent to generate carbon monoxide so as to reduce ferric oxide in the sulfuric acid slag.

Description

Device for co-producing iron ore concentrate by using pyrite to produce acid

Technical Field

The invention belongs to the technical field of acid making and sulfuric acid residue resource utilization, and particularly relates to a device for co-producing iron ore concentrate by using pyrite to make acid.

Background

Pyrite is an important mineral resource in China, and sulfuric acid is an important inorganic chemical raw material and is mainly used for producing chemical fertilizers; the iron ore concentrate is used for ferrous metallurgy.

In the current production technology, a fluidized bed furnace roasting process is adopted for preparing sulfuric acid from pyrite, flue gas and sulfuric acid slag are generated in the roasting process, wherein the flue gas is sent to an acid making process after passing through a waste heat boiler and a dust remover, the iron content of the sulfuric acid slag is about 25-50%, and because the content of residual sulfur is high, iron exists in a ferric oxide form, the grade cannot be improved through magnetic separation, the residual sulfur is difficult to utilize, a large amount of land is occupied in stacking, waste water is generated, and the surrounding environment is polluted.

Disclosure of Invention

Aiming at the defects of the existing production device and method, the invention provides a device for producing acid and co-producing iron ore concentrate by using pyrite, aiming at carrying out thermal state magnetization reduction on the generated sulfuric acid slag while producing acid, so that the sulfuric acid slag can be utilized by magnetic separation, the full utilization of resources is realized, and the influence on the ecological environment is reduced.

The invention adopts the following technical scheme: the device for producing acid and co-producing iron ore concentrate by using pyrite comprises a fluidized bed roaster, a magnetizing reduction furnace, a waste heat boiler, a cyclone dust collector and an electric dust collector; the fluidized bed roaster comprises a fluidized bed roaster air inlet, an air cap, a fluidized bed roaster body, a fluidized bed roaster feed inlet, a fluidized bed roaster discharge port and a fluidized bed roaster flue gas outlet, the waste heat boiler comprises a boiler, a waste heat boiler flue gas inlet, a waste heat boiler flue gas outlet and a waste heat boiler slag discharge port, the cyclone dust collector comprises a cyclone dust collector flue gas inlet, a cyclone dust collector flue gas outlet, a cyclone dust collector slag discharge port and a cyclone dust collector shell, the electric dust collector comprises an electric dust collector flue gas inlet, an electric dust collector flue gas outlet, an electric dust collector slag discharge port and an electric dust collector body, and the magnetization reduction furnace comprises a magnetization reduction furnace air inlet, a magnetization reduction furnace flue gas outlet, a magnetization reduction furnace feed inlet, a magnetization reduction furnace discharge port, a reducing agent.

The flue gas outlet of the fluidized bed roaster is communicated with the flue gas inlet of the waste heat boiler, the flue gas outlet of the waste heat boiler is communicated with the flue gas inlet of the cyclone dust collector, the flue gas outlet of the cyclone dust collector is communicated with the flue gas inlet of the electric dust collector, and the flue gas outlet of the electric dust collector is communicated with the acid making process device. The discharge hole of the fluidized bed roaster, the slag discharge hole of the waste heat boiler, the slag discharge hole of the cyclone dust collector and the slag discharge hole of the electric dust collector are communicated with the feed hole of the magnetic reduction furnace. Air enters from an air inlet of the fluidized bed roaster, and after pyrite is fed from a feed inlet of the fluidized bed roaster, the pyrite and the air form a fluidized bed in the furnace body of the fluidized bed roaster, and sulfur-containing flue gas and sulfuric acid slag containing ferric oxide are generated by heating and reacting. The sulfur-containing flue gas is subjected to waste heat recovery by a preheating boiler, and is subjected to dust removal by a cyclone dust collector and an electric dust collector and then is used for subsequent acid preparation; the method comprises the following steps of enabling sulfuric acid slag discharged from a discharge port of a fluidized bed roaster, a slag discharge port of a waste heat boiler, a slag discharge port of a cyclone dust collector and a slag discharge port of an electric dust collector to enter a magnetic reduction furnace body through a feed inlet of a magnetic reduction furnace, enabling carbonaceous reducing agents such as petroleum coke and the like to enter the magnetic reduction furnace body from a reducing agent inlet of the magnetic reduction furnace, enabling air to enter the magnetic reduction furnace body from an air inlet of the magnetic reduction furnace, enabling oxygen in the air to react with the carbonaceous reducing agents under the effect of sensible heat of the sulfuric acid slag to generate carbon monoxide, keeping a reducing atmosphere in the magnetic reduction furnace, reducing ferric oxide into ferroferric oxide to become iron ore concentrate, discharging the iron.

Preferably, the flue gas outlet of the magnetic reduction furnace is communicated with the furnace body of the fluidized bed roaster, and toxic carbon monoxide in the magnetic reduction furnace can be combusted in the fluidized bed roaster to generate carbon dioxide which is discharged together with the flue gas.

The invention has the beneficial effects that:

(1) can collect the pyrite cinder in the pyrite roasting process and utilize when carrying out the pyrite ore acid-making, change the pyrite cinder into the iron ore concentrate that can utilize through the magnetization reduction technique, improve resource utilization, reduce the emission of solid waste, be favorable to environmental protection.

(2) The sensible heat of the roasted sulfate slag can be effectively utilized, the ferric oxide can be directly reduced into the ferroferric oxide in a thermal state, and the energy is saved.

Drawings

FIG. 1 is a schematic diagram of an apparatus for producing acid and co-producing iron ore concentrate from pyrite according to the present invention;

in the figure, 1-a fluidized bed roaster, 2-a magnetic reduction furnace, 3-a waste heat boiler, 4-a cyclone dust collector, 5-an electric dust collector, 101-air, 102-pyrite, 103-a carbonaceous reducing agent, 104-iron ore concentrate and 105-flue gas.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

The main equipment and specifications of the device in this embodiment are:

fluidized bed roaster: 109m²The annual treatment capacity is 20 ten thousand tons of iron sulfide; a magnetic reduction furnace: 40m²(ii) a Waste heat boiler: the evaporation capacity is 40 t/h; a cyclone dust collector: phi 6000mm electric dust remover: 200m². The carbonaceous reducing agent used in this example was petroleum coke.

A device for producing acid and iron ore concentrate by using pyrite is mainly composed of a fluidized bed roaster 1, a magnetizing reduction furnace 2, a waste heat boiler 3, a cyclone dust collector 4 and an electric dust collector 5, as shown in figure 1. The fluidized bed roaster 1 comprises a fluidized bed roaster air inlet, an air cap, a fluidized bed roaster furnace body, a fluidized bed roaster feed inlet, a fluidized bed roaster discharge outlet and a fluidized bed roaster flue gas outlet, and the waste heat boiler 3, the cyclone dust collector 4 and the electric dust collector 5 are all provided with a flue gas inlet, a flue gas outlet and a slag discharge port. The flue gas outlet of the fluidized bed roaster 1 is communicated with the flue gas inlet of the waste heat boiler 3, the flue gas outlet of the waste heat boiler 3 is communicated with the flue gas inlet of the cyclone dust collector 4, the flue gas outlet of the cyclone dust collector 4 is communicated with the flue gas inlet of the electric dust collector 5, and the flue gas outlet of the electric dust collector 5 is communicated with the acid making process device. When in use, the pyrite 102 with the particle size of 45-200 mu m is fed into the fluidized bed roaster from the feeding hole of the fluidized bed roaster 1, the air 101 enters from the air inlet of the fluidized bed roaster 1, and the pyrite 102 and the air 101 form a fluidized bed in the furnace body of the fluidized bed roaster 1 and chemically react with oxygen in the air to generate flue gas and sulfuric acid residue containing ferric oxide. The roasted flue gas enters a waste heat boiler 3 through a flue gas outlet of a fluidized bed roaster 1, waste heat is recovered, and the flue gas 105 obtained after being purified by a cyclone dust collector 4 and an electric dust collector 5 is sent to an acid making process.

The discharge hole of the fluidized bed roaster 1, the slag discharge hole of the waste heat boiler 3, the slag discharge hole of the cyclone dust collector 4 and the slag discharge hole of the electric dust collector 5 are communicated with the feed inlet of the magnetizing reduction furnace 2. The sulfuric acid slag containing ferric oxide generated by reaction in the fluidized bed roaster 1 and the smoke dust containing the sulfuric acid slag collected by the waste heat boiler 3, the cyclone dust collector 4 and the electric dust collector 5 are discharged along with a discharge hole or a slag discharge hole of corresponding equipment, and enter the magnetization reduction furnace 2 through a feed inlet of the magnetization reduction furnace, the carbonaceous reducing agent 103 enters the magnetization reduction furnace 2 from a reducing agent inlet of the magnetization reduction furnace 2, air 102 enters the magnetization reduction furnace 2 from an air inlet of the magnetization reduction furnace, and under the heating of high-temperature sulfuric acid slag clinker, the carbonaceous reducing agent 103 reacts with oxygen in the air to generate carbon monoxide, so that the ferric oxide in the sulfuric acid slag clinker is reduced into magnetic ferroferric oxide to become iron ore concentrate 104. And discharging the iron ore concentrate 104 from a discharge hole of the magnetizing reduction furnace 2, and performing magnetic separation to obtain the iron and steel smelting product.

The flue gas outlet of the magnetic reduction furnace 2 is introduced into the fluidized bed roaster 1, and the flue gas of the magnetic reduction furnace containing carbon monoxide enters the fluidized bed roaster 1 through the flue gas outlet of the magnetic reduction furnace and is discharged along with the flue gas after being combusted in the furnace.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: modifications can be made to the technical solutions described in the embodiments or equivalent substitutions can be made on some technical features; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides an utilize pyrite system sour coproduction iron ore concentrate device which characterized in that: the device for producing acid and co-producing iron ore concentrate by using pyrite comprises a fluidized bed roaster, a magnetizing reduction furnace, a waste heat boiler, a cyclone dust collector and an electric dust collector; the fluidized bed roaster comprises a fluidized bed roaster air inlet, an air cap, a fluidized bed roaster body, a fluidized bed roaster feed inlet, a fluidized bed roaster discharge port and a fluidized bed roaster flue gas outlet, the waste heat boiler comprises a boiler, a waste heat boiler flue gas inlet, a waste heat boiler flue gas outlet and a waste heat boiler slag discharge port, the cyclone dust collector comprises a cyclone dust collector flue gas inlet, a cyclone dust collector flue gas outlet, a cyclone dust collector slag discharge port and a cyclone dust collector shell, the electric dust collector comprises an electric dust collector flue gas inlet, an electric dust collector flue gas outlet, an electric dust collector slag discharge port and an electric dust collector body, and the magnetization reduction furnace comprises a magnetization reduction furnace air inlet, a magnetization reduction furnace flue gas outlet, a magnetization reduction furnace feed inlet, a magnetization reduction furnace discharge port, a reducing agent;

the flue gas outlet of the fluidized bed roaster is communicated with the flue gas inlet of the waste heat boiler, the flue gas outlet of the waste heat boiler is communicated with the flue gas inlet of the cyclone dust collector, the flue gas outlet of the cyclone dust collector is communicated with the flue gas inlet of the electric dust collector, and the flue gas outlet of the electric dust collector is communicated with the acid making process device; the discharge hole of the fluidized bed roaster, the slag discharge hole of the waste heat boiler, the slag discharge hole of the cyclone dust collector and the slag discharge hole of the electric dust collector are communicated with the feed hole of the magnetic reduction furnace.

2. The apparatus for producing acid and co-producing iron ore concentrate from pyrite according to claim 1, wherein the flue gas outlet of the magnetic reduction furnace is communicated with the furnace body of the fluidized bed roaster.