WO2011063739A1

WO2011063739A1 - Roasting reduction shaft furnace

Info

Publication number: WO2011063739A1
Application number: PCT/CN2010/079032
Authority: WO
Inventors: 杨光
Original assignee: Yang Guang
Priority date: 2009-11-25
Filing date: 2010-11-23
Publication date: 2011-06-03
Also published as: CN201589515U

Abstract

A roasting reduction shaft furnace comprises a feed system at the top of the furnace, a furnace body, an ore discharge system at the lower part of the furnace body and a gas exhaust system. The furnace chamber of the furnace body is divided into a preheat region (2), a roasting region (3) and a reduction region (4) from top to bottom. A preheating region (6) and a heating region (7) are arranged at two sides of the roasting region (3). The preheating region (6) is communicated with the upper end of the roasting region (3), and the heating region (7) is communicated with the lower end of the roasting region (3), in addition, the preheating region (6) is isolated from the heating region (7).

Description

Roasting reduction shaft furnace

The utility model belongs to the technical field of chemical beneficiation equipment, in particular to solving roasting of various types of iron oxide minerals which are difficult to select, iron-poor iron oxide ore burning, and multi-metal co-contained ore with high ore content. Restore the shaft furnace.

Background technique

The magnetization roasting has a shaft furnace roasting, a converter roasting, a boiling roasting, and a ramp furnace roasting according to the roasting method. Shaft furnaces and converters are used to roast ore in a fixed bed. Boiling roasting and ramp furnace roasting are dynamic roasting. Boiling roasting is a method of magnetizing roasting ore in a fluidized fluidized bed. It is suitable for the treatment of fine ore. According to the research in recent years in China and related foreign reports, boiling roasting has high output, low investment and cost ratio converter. It is about two-thirds lower, but it is currently in the semi-industrial test and industrial test stage. The slope furnace is a method of magnetizing roasting powder ore in a floating bed between a fluidized bed and a fixed bed. The time of the semi-industrial test and industrial test proves that the slope furnace has a simple structure, a fast construction, and a granularity to the original ore. The characteristics of humidity adaptability, but it is still in the industrial test stage.

The Anshan-type shaft furnace is often used in the burning of poor ore mines. However, it requires the construction of blast furnaces and coke ovens. The investment is very huge, and the environmental pollution is serious. Only by solving environmental problems can this process be adopted, and the national industrial policy is clearly ordered. Shut down the small blast furnace and close the high-energy coking plant, so that the old craft with 83 years of history can not be promoted. Moreover, the structure of the body cavity of the Anshan-type shaft furnace is relatively simple, mainly for the treatment of lump ore, and is not suitable for powder ore.

The poor iron ore beneficiation resources that have been discovered in China are ranked first in the world, but most of them cannot be exploited and utilized, resulting in a great waste of resources. China's demand for iron ore can only rely on the import of high-priced iron ore from abroad. To this end, it is particularly urgent and important to innovate research and development of mineral processing equipment and technology.

Utility model content In order to solve the problems of the prior art, an improved Anshan type shaft furnace is provided, which not only has small investment, but also has simple process, wide application range of granularity of calcined ore, and effectively solves refractory and iron-poor iron oxide ore burning. And the multi-metal co- (concomitant) ore-prone problem of various types of iron oxide minerals with high ore ratio and complex ore composition, so that the above-mentioned abandoned mineral resources can be effectively utilized.

The technical solution adopted is: a roasting reduction shaft furnace, comprising a feeding system in the upper part of the top of the furnace, a furnace body, a discharging system in the lower part of the furnace body, and a smoking system, and the furnace body cavity is divided into pre-stages from top to bottom. The hot zone, the calcination zone, the reduction zone, and the preheating zone and the heating zone on both sides of the calcination zone. The upper ends of the preheating zone and the calcining zone are turned on, the lower ends of the heating zone and the calcining zone are turned on, and the preheating zone and the heating zone are disposed apart.

The inner cavity portion at the firing zone of the furnace body is a rectangular parallelepiped.

The discharging system has a roller type discharging machine disposed on both sides of the lower part of the reduction zone of the furnace body, and the transmission part adopts a pendulum type speed reducer.

The utility model fundamentally improves the limitation of the size of the roasting ore by the Anshan-type shaft furnace, the poor quality of roasting, the large capital investment, the long construction period and the high production cost, and the blast furnace and the coke oven are not required for production, and the site selection and the process are The requirements are simple, the investment is small, the construction period is short, the effect is quick, and it meets the national environmental protection requirements. Through the "weak magnetic separation of iron ore magnetization roaster" process, it solves the refractory, iron-poor iron oxide ore burning, and the multi-metal co-contained ore with high proportion of ore and complex ore composition. The problem of mineral processing has enabled the above-mentioned abandoned mineral resources to be effectively utilized.

The inner cavity of the furnace body roasting zone is a rectangular parallelepiped, which makes the ore uniformly descend and roasting, which overcomes the shortcoming of the falling edge of the ore in the old furnace type of the Anshan type shaft furnace.

The particle size range of the mineral particles in the furnace of the utility model is relatively large, and the quality of the roasting product is relatively uniform, but the production cost is about 1.5 times lower than that of the Anshan type shaft furnace.

Granular range of ore treated by various roasters Furnace type roasting ore particle size (匪) Remarks Anshan type shaft furnace 75-20 Domestic industrial production application converter 30-0 Foreign production application boiling furnace 3 ( 5 ) -0 Domestic semi-industrial test slope furnace 12 ( 25 ) - 0 Domestic semi-industrial test The utility model 100-0 domestic industrial production application has low heat consumption per ton of ore coal.

The experiment proves that after the magnetic roasting of the product of the utility model, the concentrate grade is

60% ~ 63%, the yield is about 50%, thus reaching the standard of steel smelting raw materials.

DRAWINGS

Figure 1 is a schematic cross-sectional view of an Anshan-type shaft furnace;

Figure 2 is a schematic cross-sectional view of the utility model.

detailed description

The utility model and its beneficial effects are further described below with reference to the accompanying drawings.

Referring to Figure 2, a roasting reduction shaft furnace includes a feeding system at the upper portion of the furnace top, a furnace body, a discharge system at the lower portion of the furnace body, and a smoking system, and the furnace chamber is divided into a preheating zone from top to bottom. , the calcining zone 3, the reduction zone 4, and the preheating zone 6 and the heating zone 7 on both sides of the calcining zone 3, the upper ends of the preheating zone 6 and the calcining zone 3 are connected, and the lower ends of the heating zone 7 and the calcining zone 3 are connected. And the preheating zone 6 and the heating zone 7 are sealed and isolated, and the inner cavity section of the furnace body roasting zone 3 is a rectangular parallelepiped; the structure makes the distribution of the redox agent in the furnace relatively uniform, and the ore falling speed is relatively uniform. In the heating zone and the reduction zone, it is conducive to the uniform drop and roasting of the ore, which overcomes the shortcoming of the falling edge of the ore in the old furnace type of the Anshan type shaft furnace. Moreover, there are less flammable gases remaining in the exhaust gas, and the effective utilization rate of the redox agent is high, which solves the problem of incomplete combustion of the gas in the past.

The discharging system mainly has a roller type discharging machine which is arranged on both sides of the lower part of the reduction zone 4 of the furnace body. 8, the transmission part adopts a pendulum type reducer, the roller type discharge machine 8 is placed in the water of the water quenching cooling room 5; the needle pendulum type reducer can achieve small investment, simple installation, reliable operation, and the rotation speed can be According to the quality of ore reduction, it can be adjusted to achieve simple discharge.

The upper part of the top of the utility model is a feeding funnel, the two sides of the funnel are exhaust pipes, the corresponding exhaust pipe is connected with the exhaust pipe, two dust collectors are installed, and two sets of smoke collecting and dust collecting systems are formed, and the two sets of dust collectors are After the flue gas passes through the cyclone dust eliminator, the exhaust gas is discharged into the atmosphere by an exhaust fan.

Claims

1. A roasting reduction shaft furnace, comprising a feeding system at the upper part of the furnace top, a furnace body, a discharging system at the lower part of the furnace body, and a smoking system, wherein: the furnace body cavity is divided into preheating from top to bottom. Zone (2), calcination zone (3), reduction zone (4), and preheating zone (6) and heating zone (7) on both sides of the calcination zone (3), preheating zone (6) and calcination zone ( 3) The upper end is turned on, the heating zone (7) and the lower end of the firing zone (3) are turned on, and the preheating zone (6) and the heating zone (7) are isolated.

The calcination reduction shaft furnace according to claim 1, wherein the inner cavity of the furnace calcination zone (3) has a rectangular parallelepiped.

3. The calcining reduction shaft furnace according to claim 1, wherein: the ore discharging system has a roller type discharging machine (8) disposed at two sides of a lower portion of the furnace body reducing zone (4), wherein the transmission part is adopted Needle pendulum reducer.