Method for comprehensive utilization of paigeite through direct reduction-electric furnace melting separation of rotary hearth furnace

A boron iron ore and rotary hearth furnace technology, applied in chemical industry, resource comprehensive utilization, and metallurgy fields, can solve the problems of no successful implementation, influence on reaction speed, low reduction temperature, etc., and achieve easy automation, fast reaction speed and high strength undemanding effects

Active Publication Date: 2014-02-26
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it also has its inherent disadvantages: the material rolls in the kiln with the rotation of the kiln body, and is easy to be crushed, and the produced powder and coal ash stick together to form a "ring", thus damaging the furnace lining, forming an operation accident, and reducing the operating rate. Decrease; Affected by "ringing", the reduction temperature is low, generally the highest is about 1100°C, which affects the reaction speed; there are specific requirements for coal types, the ash melting point must be higher than 1280°C, otherwise ringing will occur
However, the selection of coal gas production process, the selection of reducing agent for gas production, the quality of reducing gas produced, the selection of iron-containing raw materials, the comprehensive utilization of gas production by-products, the connection between coal gas production and shaft furnace, the relationship between gas pressure and shaft furnace, etc. Furnace pressure connection and related equipment and other issues still need further in-depth research and discussion, so there is no successful implementation example

Method used

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  • Method for comprehensive utilization of paigeite through direct reduction-electric furnace melting separation of rotary hearth furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] according to figure 1 As shown in the process flow, a certain B 2 o 3 3.26% boron ore ore powder, coal powder with a weight of 20% boron ore weight, and 2% binder with a weight of boron ore and coal powder weight sum are transported to the mixer through a belt for mixing, and the mixing is adjusted. Homogenize moisture to 7%. The mixed material is conveyed to the double-roller ball pressing machine through the belt to make carbon-containing pellets, the pressure is 15MPa, and the size of the pellets is 40×30×20mm pillow-shaped ellipsoid. After the raw balls are dried, they are spread on the carbonaceous refractory material in the rotary hearth furnace in a single layer, and a layer of carbonaceous or refractory material powder with a thickness of 3 to 5 mm is laid on the carbonaceous refractory material in advance. The temperature in the rotary hearth furnace is 1200~1300°C, the residence time of the pellets in the rotary hearth furnace is 15~25 minutes, the metalliz...

Embodiment 2

[0034] according to figure 1 shown in the process flow, will contain B 2 o 3 6.90% boron ore ore powder, coal powder with a weight of 17% of boron ore weight, and 2% binder with a weight of boron ore and coal powder weight sum are conveyed to the mixer through a belt for mixing, and the mixing is adjusted. Homogenize moisture to 7%. The mixed material is conveyed to the double-roller ball pressing machine through the belt to make carbon-containing pellets, the pressure is 15MPa, and the size of the pellets is 40×30×20mm pillow-shaped ellipsoid. After the raw balls are dried, they are spread on the carbonaceous refractory material in the rotary hearth furnace in a single layer, and a layer of carbonaceous or refractory material powder with a thickness of 3 to 5 mm is laid on the carbonaceous refractory material in advance. The temperature in the rotary hearth furnace is 1200~1350℃, the residence time of the pellets in the rotary hearth furnace is 20~30 minutes, the metalliza...

Embodiment 3

[0042] Metallized pellets were obtained according to the method of Example 2, and the metallized pellets were directly loaded into an electric furnace with a magnesia lining for melting at a melting temperature of 1500° C. for 40 minutes to obtain liquid pig iron and boron-rich slag, carburizing in pig iron As the amount decreases, the boron content also decreases accordingly, while the content of boron oxide in boron-rich slag increases, reaching the standard of first-class boronite ore. The composition of boronite used is shown in Table 4, and the composition of liquid pig iron and boron-rich slag obtained by melting is shown in Table 7 and 8, respectively.

[0043]

[0044] Table 7 Main components of pig iron

[0045] Element C Si B P S content / % 1.25 0.048 0.055 0.028 0.061

[0046] Table 8 Main components of boron-rich slag

[0047] Element TF MgO al 2 o 3 CaO B 2 o 3 SiO 2 content / % 2.05 50.72 2.62...

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Abstract

The invention discloses a method for comprehensive utilization of paigeite through direct reduction-electric furnace melting separation of a rotary hearth furnace, belonging to the field of iron-making and resource comprehensive utilization. The invention relates to a method for separating and gathering boron and iron in paigeite, and the method is used for development and utilization of paigeite. The method is characterized in that liquid pig iron (or semisteel) and high-quality boron-rich slag of which the B2O3 content is 10-22% are prepared by using paigeite powder, a carbonaceous reducing agent and a binding agent as raw materials through the processes of blending, uniform mixing, agglomeration, rotary hearth furnace reduction, electric furnace melting separation and the like. The produced liquid pig iron (or semisteel) can be used as a raw material for steel making, and the boron-rich slag can replace camsellite ores to produce boric acid or borax, so that boron and iron resources can be fully used to realize comprehensive utilization of paigeite. The method disclosed by the invention is simple in process, short in flow, thorough in boron-ion separation and high in efficiency and the separated products can meet requirements for boron industry and steel industry at the same time and have good social and economic benefits.

Description

[0001] technical field [0002] The invention belongs to the fields of chemical industry, metallurgy and resource comprehensive utilization, and relates to a method for the comprehensive utilization of boronite by rotary hearth furnace coal-based direct reduction-electric furnace melting, which is used for the development and utilization of boronite. Background technique [0003] Boron is widely used in chemical industry, medicine, light industry, textile, electronics, metallurgy, building materials, national defense and military industry, cutting-edge science, agriculture and other departments. Since 1956, my country's boron industry has mainly used boronite ore (commonly known as "white boron ore") as the main raw material. At present, this kind of ore is close to exhaustion, and more than 60% of it depends on imports. The boron ore (commonly known as "black boron ore") located in the Liao-Jilin area is a large-scale boron-magnesium-iron symbiotic deposit that has been pro...

Claims

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Application Information

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IPC IPC(8): C21B13/00C01B35/02
Inventor 王静松王广薛庆国佘雪峰宁晓宇郁新芸
Owner UNIV OF SCI & TECH BEIJING
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