A composite additive for strengthening the direct reduction of laterite nickel ore and its application

A composite additive and lateritic nickel ore technology, applied in furnaces, furnace types, rotary drum furnaces, etc., can solve problems such as unproposed solutions, and achieve the effects of increasing the reduction rate, increasing the metallization rate, and increasing the burst temperature

Active Publication Date: 2021-02-09
北京中宏联工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the problems described in the related art, no effective solution has been proposed yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Crush the laterite nickel ore to -0.074mm, accounting for 80%, and mix it with 5% composite additives (nickel smelting slag 45%, waste iron oxide desulfurizer 50%, sodium humate 5%), and then pelletize for 12 minutes, Green pellets with a particle size of 8-20mm were prepared under the condition of 16.0% pelletizing water. The resulting green pellets had a drop strength of 8.9 times / 0.5m, a compressive strength of 11.2N per pellet, and a burst temperature of 270°C.

[0050] The obtained raw balls are dried and preheated in a grate machine, the thickness of the material layer is 80mm, the drying temperature is 250°C, the blast drying time is 3min, and the draft drying time is 3min; then the temperature is raised to 1000°C and preheated for 15min, and the preheated The ball strength is only 520N / piece.

[0051] The hot preheated pellets were transferred to a rotary kiln, and reduced at a reduction temperature of 1200°C, a reduction time of 90 minutes, and the mass ratio o...

Embodiment 2

[0054] Crush the laterite nickel ore to -0.074mm, accounting for 83%, and mix it with 8% composite additives (nickel smelting slag 40%, waste iron oxide desulfurizer 50%, sodium humate 10%), and then pelletize for 10 minutes, Green pellets with a particle size of 8-20mm were prepared under the condition of 16.5% pelletizing water. The resulting green pellets had a drop strength of 9.8 times / 0.5m, a compressive strength of 13.55N per pellet, and a burst temperature of 310°C.

[0055] The obtained raw balls are dried and preheated in a grate machine, the thickness of the material layer is 90mm, the drying temperature is 300°C, the blast drying time is 2min, and the draft drying time is 4min; then the temperature is raised to 950°C and preheated for 15min. The ball strength is only 590N / piece.

[0056] The hot preheated pellets were transferred to a rotary kiln, and reduced at a reduction temperature of 1200°C, a reduction time of 80 minutes, and the mass ratio of carbon in the r...

Embodiment 3

[0059] Crush the laterite nickel ore to -0.074mm, accounting for 85%, and mix it with 10% composite additives (nickel smelting slag 45%, waste iron oxide desulfurizer 45%, sodium humate 10%), and then pelletize for 10 minutes, Green pellets with a particle size of 8-20mm were prepared under the condition of 16.0% pelletizing water. The resulting green pellets had a drop strength of 10.5 times / 0.5m, a compressive strength of 14.5N per pellet, and a burst temperature of 350°C.

[0060] The obtained raw balls are dried and preheated in a grate machine, the thickness of the material layer is 90mm, the drying temperature is 300°C, the blast drying time is 3min, and the draft drying time is 3min; then the temperature is raised to 950°C and preheated for 15min, and the preheated The ball strength is only 620N / piece.

[0061] The red-hot preheated pellets were transferred to a rotary kiln, and reduced at a reduction temperature of 1150°C, a reduction time of 90 minutes, and the mass r...

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Abstract

The invention belongs to the technical field of resource utilization for metallurgical and industrial waste slag, and specifically relates to a composite additive for strengthening direct reduction for laterite-nickel ores, and an application thereof. The composite additive for strengthening the direct reduction for the laterite-nickel ores is composed of the following components in percentage bymass: 30wt%-60wt% of nickel smelting slag, 30wt%-60wt% of spent ferric oxide desulfurizing agent, and 5wt%-10wt% of sodium humate. The nickel smelting slag is the smelting slag generated in a smeltingprocess for nickel sulfide ores; and the spent ferric oxide desulfurizing agent is a spent desulfurizing agent generated through refining desulfurizing for coal gas. The composite additive for strengthening the direct reduction for the laterite-nickel ores can be used for strengthening the reduction for the laterite-nickel ores, increasing the metallization rate, and promoting the gathering and growth of ferronickel crystalline grains, so that the metal recovery rate of a direct reduction-magnetic separation process is increased.

Description

technical field [0001] The invention relates to a composite additive for strengthening the direct reduction of laterite nickel ore and an application thereof, belonging to the technical field of resource utilization of metallurgy and industrial waste residue. Background technique [0002] 85% of nickel in my country is used in stainless steel production. With the depletion of nickel sulfide ore, laterite nickel ore, which accounts for more than 60% of the total nickel resources, has become the main source of nickel. Compared with the production of stainless steel using high-purity nickel plate prepared from nickel sulfide ore as the main raw material, ferronickel produced by laterite nickel ore has the advantages of short process, low cost and good product performance. At the same time, pyro-smelting of laterite nickel ore to produce ferronickel can not only avoid the waste of energy and resources caused by the separation of nickel and iron followed by alloying, but also re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B5/10C22B23/02C21B13/08
CPCC21B13/006C21B13/0066C21B13/008C21B13/08C22B1/2406C22B5/10C22B23/021C22B23/023
Inventor 潘建朱德庆郭正启李启厚
Owner 北京中宏联工程技术有限公司
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