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Device and method for respectively producing metal and fire-resistant materials or construction materials through one-time heating

A technology of building materials and metals, applied in the direction of lighting and heating equipment, furnaces, furnace types, etc., can solve the problems of poor environment, pollution, reducing gas and heat that cannot be used by rotary kilns, etc.

Inactive Publication Date: 2014-11-26
周海彬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high cost of coke, the cost of blast furnace smelting is high, and the operating environment is poor and the pollution is serious
Moreover, sintering also consumes a large amount of energy, the environment is poor, the pollution is serious, and the whole process is complicated.
[0004] The heat of the reverberatory furnace system is mainly reflected to heat the material through the furnace wall and the furnace roof, and the thermal efficiency is low; and the single furnace is operated periodically, and the efficiency is low
[0005] Tunnel kilns use direct reduction of metals for crystallization. After crushing, metals and slag are separated by magnetic separation, gravity separation, and water washing. However, the metal produced by this method contains 20-30% slag, and the subsequent process requires a lot of energy to melt the metal and slag. Slag, waste of energy, and heavy metals pollute water sources
[0006] The rotary hearth furnace + melting furnace system is firstly dried and pre-reduced, then heated by gas and melted while reducing, and finally the slag and metal are extracted separately. This method avoids repeated heating of the metal, but the material is first heated to 1200°C in the rotary hearth furnace Then cool down to 800-900°C and then heat it into the melting furnace. The material is heated back and forth at 400°C, which wastes energy and production capacity; at the same time, because the material needs to be transported back and forth in sealed tanks, there is a temperature loss and a large investment; and melting The furnace and the rotary hearth furnace cannot communicate, the reducing atmosphere and heat of the melting furnace cannot be used by the rotary hearth furnace, and the total thermal efficiency is low
[0007] The rotary kiln + submerged arc furnace is also dried and pre-reduced first, and then the sealed tank is transported into the submerged arc furnace and heated to 1450-1600°C for melting and reduction. Also, because the rotary kiln and the submerged arc furnace are arranged independently, the material is heated at the temperature of the rotary kiln If it is less than 1000°C, it will lose 100°C when it is packed and transported, and then it needs to be heated with expensive electricity after it is loaded into the submerged arc furnace. The reducing gas and heat of the furnace cannot be used by the rotary kiln
[0008] The biggest shortcoming common to all the above processes is that the slag is not well treated and utilized as a resource, and the full utilization of the heat of the high-temperature slag is not considered;

Method used

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  • Device and method for respectively producing metal and fire-resistant materials or construction materials through one-time heating
  • Device and method for respectively producing metal and fire-resistant materials or construction materials through one-time heating
  • Device and method for respectively producing metal and fire-resistant materials or construction materials through one-time heating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A certain ore contains Fe 2 o 3 70%, TiO 2 15%, SiO 2 22%, first batching, according to 8-20 parts of reduced coal, 70-90 parts of ore, 5-10 parts of co-solvent, after pelleting and drying, put the material into the rotary furnace through the slide tube 1, and rotate it for 4-7 hours. Heated to 1100-1380°C, after baking, roasting, reduction and other physical and chemical reactions, the reduction rate of metallic iron reaches more than 90%, and then the semi-molten material falls into the slag metal separation furnace 23, and then passes through the end wall 20 to install The cluster reduction gun 19 sprays the strong reducing gas containing H2 and CO gas up to 70% produced by the catalytic cracking of natural gas for forced reduction, so that the reduction rate can be further increased to 95-99%, and the high-pressure gas is used to push the metal floating on the metal liquid The material moves forward to be further heated, and the temperature of the material reache...

Embodiment 2

[0067] A lateritic nickel ore contains Ni1.8%, Fe20%, MgO12%, SiO 2 20%, H 2 O34%, first use the waste heat of the rotary kiln 4 to bake the material until the water content is 8-15%, and then mix the ingredients according to 8-25 parts of reduced coal, 70-90 parts of dried ore, and 5-12 parts of co-solvent. Ball making, and then put the material into the rotary furnace through the chute 1, and after 4-7 hours of rotation, the material is heated to 1100-1380 ° C, after baking, roasting, reduction and other physical and chemical reactions, the reduction rate of metallic iron reaches 90 %, then the semi-molten material falls into the slag metal separation furnace 23, and then through the cluster reduction gun 19 installed at the end wall 20, injects the strong reducing gas containing H2 and CO gas up to 70% produced by catalytic cracking of natural gas for forced reduction , so that the reduction rate is further increased to 95-99%, and the material floating on the metal liquid...

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Abstract

The invention relates to a device and method for reducing metal from waste materials, in particular to a device and method for respectively producing metal and fire-resistant materials or construction materials through one-time heating. A rotary furnace discharge outlet is connected with a metal slag charge separation furnace. The two ends of a rotary furnace are provided with sealing rings. The rotary furnace sealing rings and a metal barrel body outside the rotary furnace form a U-shaped groove. A cooling air nozzle is arranged in the U-shaped groove. A cooling air main pipeline is arranged on the outer side of the rotary furnace. A material sliding tube is arranged in a rotary furnace feed inlet. A furnace tail sealing cover is arranged outside the rotary furnace feed inlet and is connected with a sealing passage. A fuel coal gas burner is arranged on the sealing passage. A separating furnace sealing ring is arranged in the connecting position of the rotary furnace and the metal slag charge separation furnace. A high-pressure restoration gas spray gun is arranged on the front wall of the furnace. A plurality of flat flame burners are arranged in the metal slag charge separation furnace. A furnace top is connected with a fire blocking wall. A device discharge outlet is formed in the back wall of the furnace. The device and method for respectively producing metal and fire-resistant materials or construction materials through one-time heating can sufficiently recover metal in metallic oxide mines or industrial oxide waste residue, and can convert the residual slag charge into useful products.

Description

[technical field] [0001] The invention relates to a device and a method for reducing metal by scrap, in particular to a device and a method for producing metal and refractory or building materials respectively by one heating. [Background technique] [0002] Whether it is metal recovery from metal oxide ore or metal oxide from industrial waste, metal recovery mainly includes fire recovery and wet recovery. Among them, fire production includes blast furnace blast furnace, reverberatory furnace, tunnel kiln, rotary hearth furnace + melting furnace, rotary kiln + submerged arc furnace and other methods of production. [0003] Blast furnace blast furnace smelting uses coke to provide the heat needed to melt the ore or slag and to act as a reducing agent. Moreover, the ore or waste slag needs to be sintered with a sintering machine before being added to the blast furnace for smelting. Due to the high cost of coke, the cost of blast furnace smelting is high, and the operating env...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27B7/20F27B7/24F27B7/34F27B7/38
Inventor 周海彬徐霞周佳慧
Owner 周海彬