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Method for treating poor-tin middling ore and recovering iron-making raw material

A technology for iron-making raw materials and ore materials, applied in the field of non-ferrous metallurgy, can solve problems such as affecting the quality of iron and steel, difficult to remove, harmful arsenic, etc., and achieve the effects of improving equipment production capacity, improving extraction rate, and saving energy consumption

Inactive Publication Date: 2011-11-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Arsenic is a very harmful element. If it cannot be completely removed during the chlorination volatilization process, but remains in the roasted slag (ball), it will be difficult to be completely removed in the process of ironmaking and steelmaking, which will affect the quality of iron. and steel quality
In the current process of chlorination and volatilization of tin-poor middle ore, through various technical means, the volatilization recovery rate of tin, lead, zinc, copper, etc. can reach a very high level, which can fully meet the requirements as raw materials for ironmaking; but Since there is no feasible technical solution, the arsenic removal of calcined sand (ball) is not ideal, so it can only be mixed into low-arsenic iron ore for use
At present, the arsenic removal rate of tin-poor middle ore treated by chlorination and volatilization roasting is less than 30%, and the arsenic content of calcined sand (balls) is more than 0.8%, which cannot be directly used as ironmaking raw materials

Method used

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  • Method for treating poor-tin middling ore and recovering iron-making raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The tin ore is ground and passed through a 60-mesh sieve; add 7-8% CaCl of the tin ore 2 , 3-4% pulverized coal and 6-7% quartz powder (-60 mesh), mixed and pelletized; the ore pellets are put into the rotary kiln for chlorination and volatilization roasting; pulverized coal is used as fuel; the chlorination roasting temperature is 1050~ 1100℃, time 40~60min; control CO in furnace gas 2 / CO is 2.0; the flue gas is cooled, settled and wet dust collected to recover valuable metals. The baked balls are cooled and used as raw materials for ironmaking.

[0043] The volatilization rate (%) of each valuable element is: Sn 96.2; Pb 98.4; Zn 74.6; As 94.1. Baked balls contain 46.3% iron; other main impurities (%) are: Sn 0.060; Pb 0.033; Zn 0.205; As 0.051.

Embodiment 2

[0045] The tin ore is ground and passed through a 60-mesh sieve; add 4-5% CaCl of the tin ore 2 , 4-6% pulverized coal and 3-4% quartz powder (-60 mesh), mixed and pelletized; the ore pellets are put into the rotary kiln for chlorination and volatilization roasting; pulverized coal is used as fuel; the chlorination roasting temperature is 950~ 1000°C, time 70-80min; control CO in furnace gas 2 / CO is 1.2; the flue gas is cooled, settled and wet dust collected to recover valuable metals. The baked balls are cooled and used as raw materials for ironmaking.

[0046] The volatilization rate (%) of each valuable element is: Sn 94.5; Pb 97.1; Zn 72.3; As 92.4. The baked ball contains 47.1% iron; other main impurities (%) are: Sn 0.087; Pb 0.059; Zn 0.221; As 0.065.

Embodiment 3

[0048] The tin ore is ground and passed through a 60-mesh sieve; add 6-7% CaCl of the tin ore 2 , 4-5% pulverized coal and 5-6% quartz powder (-60 mesh), mixed and pelletized; the ore pellets are put into the rotary kiln for chlorination and volatilization roasting; pulverized coal is used as fuel; the chlorination roasting temperature is 1000~ 1050°C, time 60-70min; control CO in furnace gas 2 / CO is 2.8; the flue gas is cooled, settled and wet dust collected to recover valuable metals. The baked balls are cooled and used as raw materials for ironmaking.

[0049] The volatilization rate (%) of each valuable element is: Sn 95.5; Pb 98.0; Zn 73.8; As 93.7. Baked balls contain 46.3% iron; other main impurities (%) are: Sn 0.071; Pb 0.041; Zn 0.213; As 0.054.

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Abstract

The invention provides a method for treating poor-tin middling ore and recovering an iron-making raw material. The method comprises the following steps: adding an alkalinity modifier, a reducing agent and a chlorinating agent in the ore material for mixing so as to form a mixed material, and then pelletizing, wherein the alkalinity modifier is silicon-rich ore or quartziferous ore, the mass ratio of CaO / SiO2 in the mixed material is controlled to not more than 0.65, and the mass percentage of total SiO2 is not more than 10%; carrying out high temperature chloridizing roasting on pelletized aggregate pellets, wherein chloridizing roasting conditions are as follows: the addition amount of the chlorinating agent accounts for 4-8% of that of the aggregate pellets, and the addition amount of the reducing agent accounts for 3-5% of that of the aggregate pellets, and roasting temperature is 950-1100 DEG C; controlling the volume ratio of CO2 / CO in the atmosphere to 1.0-3.0 in the roasting process; and carrying out cooling and dust collection on high-temperature smoke generated by chloridizing roasting, and then capturing and recovering valuable metals. By using the method in the invention, tin and other valuable metals are economically and efficiently extracted from the poor-tin middling ore and the iron-making raw material is recovered so as to finally achieve good effects as follows: (1) the extraction rate of the valuable meals in the poor-tin middling ore is improved; (2) the efficiencies of arsenic removal and iron-making material recovery are improved; (3) production capacity of equipment is improved, and energy is saved; and the like.

Description

technical field [0001] The invention relates to a method for treating tin-poor ore to enrich tin and simultaneously recovering iron-making raw materials, which is tin extraction metallurgy and belongs to the field of non-ferrous metallurgy. Background technique [0002] With the continuous mining of tin deposits, tin ore resources continue to decrease, and the grade of tin ore continues to decline. In order to ensure the sustainable development of the tin industry, it is necessary to vigorously improve the utilization rate of tin resources and develop tin resources. In the current tin ore mining and dressing process, the method of reducing the enrichment ratio of ore dressing, reducing the tin grade of the concentrate and producing tin-poor medium ore at the same time is adopted to improve the recovery rate of tin ore dressing; at the same time, the tailings of early tin mining are carried out Comprehensive beneficiation such as gravity separation, flotation, and gravity ma...

Claims

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Application Information

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IPC IPC(8): C22B1/08C22B1/24C22B25/02
Inventor 胡启阳李新海王志兴郭华军
Owner CENT SOUTH UNIV
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