Method for preparing metallized pellets by utilizing stannum-zinc-arsenic-contained complex iron ore

A technology of metallized pellets and composite iron ore, which is applied in the field of iron and steel metallurgy, can solve the problems of limited dosage and achieve the effects of reducing total energy consumption, accelerating reduction rate, and shortening reduction time

Inactive Publication Date: 2012-07-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strict requirements of blast furnace smelting on the content of tin and zinc in the furnace charge, its dosage is extremely limited. Under the current situation of prominent contradiction between supply

Method used

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  • Method for preparing metallized pellets by utilizing stannum-zinc-arsenic-contained complex iron ore
  • Method for preparing metallized pellets by utilizing stannum-zinc-arsenic-contained complex iron ore
  • Method for preparing metallized pellets by utilizing stannum-zinc-arsenic-contained complex iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: add coal sodium humate binder in the ratio of 0.5% of the mass percentage of the tin-containing zinc-arsenic iron ore concentrate, carry out batching, mix evenly, and obtain the mixture; Percentage is 5.0% water to carry out moistening grinding, and moistening time is 4min, obtains moistening abrasive; Moisturizing abrasive is used for pelletizing, and the mass percent content of controlling water in the pelletizing material is 8.5%, carries out pelletizing, and pelletizing time is 10min to produce green balls with a diameter of 10mm to 16mm; the raw balls are air-dried and dehydrated on the chain grate machine, the first low-temperature roasting in a weak reducing atmosphere to remove arsenic, the oxidizing atmosphere roasting for desulfurization, and the second high-temperature roasting in a weak reducing atmosphere to remove tin and zinc ;Drying system, the height of the green pellet layer on the chain grate machine is 220mm, the speed of the chain grate...

Embodiment 2

[0042] Embodiment 2: add coal sodium humate binder in the ratio of 1.0% of the mass percentage of the tin-containing zinc-arsenic iron concentrate, carry out batching, mix well, and obtain the mixture; Percentage is 7.0% water to carry out lubricating grinding, and lubricating grinding time is 7min, obtains lubricating abrasive; Moisturizing abrasive is used for pelletizing, and the mass percentage content of controlling water in the pelletizing material is 8.5%, carries out pelletizing, and pelletizing time is 10min to produce green balls with a diameter of 10mm to 16mm; the raw balls are air-dried and dehydrated on the chain grate machine, the first low-temperature roasting in a weak reducing atmosphere to remove arsenic, the oxidizing atmosphere roasting for desulfurization, and the second high-temperature roasting in a weak reducing atmosphere to remove tin and zinc ;Drying system, the height of the green pellet layer on the chain grate machine is 220mm, the machine speed o...

Embodiment 3

[0043] Embodiment 3: add coal sodium humate binder in the ratio of 1.0% of the mass percentage of the tin-containing zinc-arsenic iron concentrate, carry out batching, mix well, and obtain the mixture; Percentage is 8.0% water to carry out moistening grinding, and moistening time is 7min, obtains moistening abrasive; Moisturizing abrasive is used for pelletizing, and the mass percent content of controlling water in the pelletizing material is 8.5%, carries out pelletizing, and pelletizing time is 10min to produce green balls with a diameter of 10mm to 16mm; the raw balls are air-dried and dehydrated on the chain grate machine, the first low-temperature roasting in a weak reducing atmosphere to remove arsenic, the oxidizing atmosphere roasting for desulfurization, and the second high-temperature roasting in a weak reducing atmosphere to remove tin and zinc ;Drying system, the height of the green pellet layer on the chain grate machine is 220mm, the speed of the chain grate machi...

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Abstract

The invention relates to a method for preparing metallized pellets by utilizing stannum-zinc-arsenic-contained complex iron ore, which comprises the following steps: proportioning stannum-zinc-arsenic-contained iron ore concentrate with a binder, evenly mixing and damp milling and then pelletizing; drying and dehydrating fresh pellets on a chain grating machine through air draft; roasting in a weak reducing atmosphere at low temperature to remove arsenic; roasting in an oxidizing atmosphere to remove sulphur; roasting in the weak reducing atmosphere at high temperature to remove stannum and zinc to obtain pre-reduced pellets; and filling the pre-reduced pellets into a rotary kiln to perform coal-based direct reduction roasting to obtain the metallized pellets (DRI- direct reduced iron). According to the method for preparing the metallized pellets by utilizing the stannum-zinc-arsenic-contained complex iron ore, the technology of thermally filling the pre-reduced pellets into the kiln is adopted, thereby, the reduction speed of the pellets in the rotary kiln is obviously accelerated, and the production rate is increased. Simultaneously, the stannum, the zinc and the arsenic in the stannum-zinc-arsenic-contained complex iron ore are selectively separated, thereby, large-scale processing and utilization on the stannum-zinc-arsenic-contained iron ore concentrate can be realized.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing tin-zinc-arsenic composite iron ore, in particular to a method for preparing metallized pellets from tin-zinc-arsenic composite iron ore, which belongs to the technical field of iron and steel metallurgy. Background technique [0002] Although my country's iron ore resources have large reserves, there are many lean ores, few rich ores, and many complex and refractory ores. Tin-zinc-arsenic complex iron ore is one of the typical refractory iron ore resources, mainly containing industrial minerals such as magnetite, cassiterite, sphalerite, and arsenopyrite. Process mineralogy research shows that the main carrier mineral of iron in the ore is magnetite (accounting for 96.45% of TFe), and it is mostly produced as monomer (accounting for about 93.4%), and the rest is in other forms with metal sulfide and cassiterite The independent tin-containing mineral in the ore is cassiterite, most of whi...

Claims

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Application Information

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IPC IPC(8): C21B13/08C22B1/20
Inventor 李光辉张元波姜涛范晓慧李骞贾志鹏饶明军郭宇峰杨永斌陈许玲罗骏陈丽勇史唐明
Owner CENT SOUTH UNIV
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