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Self-heat balance laterite ore reduction method

A self-heat balance, laterite ore technology, applied in the furnace type, furnace, shaft furnace and other directions, can solve the problems of small scale, long process flow, low energy utilization efficiency and so on

Pending Publication Date: 2021-08-31
SICHUAN LOMON MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the front end of laterite smelting mainly adopts the rotary kiln process, which has a long process flow, low reduction temperature, low metallization rate, large consumption of reducing agent, easy ring formation of the rotary kiln, low operating rate and small scale
[0003] The traditional direct reduction process requires external heat supply to realize the reduction function. The heat is provided by solid or gaseous fuel, the process is cumbersome, and the energy utilization efficiency is low.

Method used

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  • Self-heat balance laterite ore reduction method
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  • Self-heat balance laterite ore reduction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as Figure 1-4 , the embodiment of the present invention provides a low-cost and suitable for laterite ore self-heat balance reduction shaft furnace direct reduction process, the reduction furnace adopts a shaft furnace, and the shaft furnace includes at least one reduction chamber 1, and each reduction chamber 1 consists of at least A combustion chamber 2 provides heat.

[0037] Described process comprises the following steps:

[0038]Raw material preparation steps: after drying the laterite ore with external water, the reducing agent is bituminous coal, in which the fixed carbon content is 65%-75% and the volatile matter content is 20%-35% by mass percentage. Among them, there is no requirement for the particle size distribution of coal and pellets, and the larger particle size needs to be crushed to be controlled within 30mm.

[0039] Distributing step: distributing the lump coal and the pellets into each of the reduction chambers 1, and in each of the reducti...

Embodiment 2

[0046] This embodiment provides a low-cost coal-based shaft furnace direct reduction process suitable for smelting laterite ore. The reduction furnace adopts a shaft furnace, and the shaft furnace includes at least one reduction chamber 1, and each reduction chamber 1 is composed of at least one Combustion chamber 2 heat supply;

[0047] Described process comprises the following steps:

[0048] Raw material preparation steps: mix the iron concentrate powder and the binder, and then pelletize on the disc pelletizer. The diameter of the pellets is about 20mm; In percentage terms, the fixed carbon content is 65% to 70%, and the volatile content is 30% to 35%;

[0049] Step of distributing materials: using furnace top feeding method, continuously and evenly distributing the pellets and lump coal into the reduction chamber 1 in layers and alternately; in each reduction chamber 1, the molar ratio of carbon to oxygen in the raw material is 1.1-1.2 ;

[0050] Direct reduction step:...

Embodiment 3

[0053] This embodiment provides a low-cost coal-based shaft furnace direct reduction process suitable for smelting laterite ore. The reduction furnace adopts a shaft furnace, and the shaft furnace includes at least one reduction chamber 1, and each reduction chamber 1 is composed of at least one Combustion chamber 2 heat supply;

[0054] Described process comprises the following steps:

[0055] Raw material preparation steps: mix the iron concentrate powder and the binder, and then pelletize on a disc pelletizer. The diameter of the pellets is 25mm; In terms of percentage, the fixed carbon content is 71%-75%, and the volatile matter content is 20%-28%.

[0056] Step of distributing materials: using furnace top charging method, continuously and evenly distributing the pellets and lump coal into the reduction chamber 1 in layers and alternately; in each reduction chamber 1, the molar ratio of carbon to oxygen in the raw material is 1.3-1.5 .

[0057] Direct reduction step: na...

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Abstract

The invention belongs to the technical field of nonferrous metallurgy, and particularly relates to a laterite ore self-heating balance reduction method. According to the laterite ore self-heating balance reduction method, coal is used as a reducing agent, on one hand, crystal water in laterite is evaporated at a high temperature and then is subjected to a water-gas reaction with the coal to generate coal gas, on the other hand, the coal gas and volatile components decomposed in the coal are also generated in the reduction process, and mixed coal gas is led out at a high temperature and returns to a combustion chamber to be combusted to serve as a heat source; and additional fuels such as the coal gas are not needed, process is simple, energy consumption is low, and energy conservation and environmental protection are achieved. The adopted coal is cheap and low-grade bituminous coal, self-heat-supply reduction is achieved, energy conservation and environmental protection are achieved, and production cost is low. A direct reduction shaft furnace can realize self-heating direct reduction, does not need or only needs a small amount of additional fuel gas, and can effectively reduce energy consumption and production cost.

Description

technical field [0001] The invention belongs to the technical field of nonferrous smelting, and in particular relates to a method for autothermal equilibrium reduction of laterite ore. Background technique [0002] At present, the front end of laterite smelting mainly adopts rotary kiln process, which has long process flow, low reduction temperature, low metallization rate, large consumption of reducing agent, easy ring formation of rotary kiln, low operation rate and small scale. [0003] The traditional direct reduction process requires external heat to realize the reduction function, and the heat is provided by solid or gaseous fuels. The process is cumbersome and the energy utilization efficiency is low. [0004] Many processes that use coal as fuel or reducing agent have more heavy tar in coal and more light tar in lignite, and the tar yield of one ton of bituminous coal is 20-60kg / Nm 3 , about 0.01~0.02kg / Nm in dry gas 3 . As the gas temperature decreases, the tar v...

Claims

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Application Information

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IPC IPC(8): C21B13/02
CPCC21B13/0066C21B13/02
Inventor 刘军
Owner SICHUAN LOMON MINING & METALLURGY