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Method for selectively roasting and separating tin, zinc and arsenic in compound iron ore containing tin, zinc and arsenic

A composite iron ore, selective technology, applied in the direction of improving process efficiency, can solve problems such as not being well solved, and achieve the effect of high separation efficiency

Inactive Publication Date: 2014-01-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the comprehensive recovery of the toxic elements arsenic and sulfur, especially the valuable elements tin and zinc, has not been well resolved

Method used

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  • Method for selectively roasting and separating tin, zinc and arsenic in compound iron ore containing tin, zinc and arsenic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Embodiment 1: According to the ratio of 0.5% of the mass percentage of the tin-containing zinc-arsenic iron ore concentrate, adding coal sodium humate binder for batching, mixing, to obtain the mixture; The water with a percentage of 5.0% is used for moist grinding, and the moist grinding time is 4 minutes to obtain a wet abrasive; the moist abrasive is used for pelletizing to produce green balls with a diameter of 10 mm to 16 mm; the green balls are dried and dehydrated, and roasted at a low temperature in a weak reducing atmosphere. Arsenic and oxidizing atmosphere roasting desulfurization, high-temperature roasting in weak reducing atmosphere to remove tin and zinc; drying system, drying temperature is 300 ° C, drying time is 6 min; weak reducing atmosphere low-temperature roasting system, roasting temperature is 500 ° C, roasting time is 5 min, smoke The volume concentration of CO in the air is 12%; the roasting system in an oxidizing atmosphere, the roasting temperat...

Embodiment 2

[0030] Embodiment 2: According to the ratio of 1.0% of the mass percentage of the tin-containing zinc-arsenic iron ore concentrate, adding coal sodium humate binder for batching, mixing, to obtain the mixture; The percentage of water is 7.0% for wet grinding, and the wet grinding time is 7 minutes to obtain wet abrasive; the wet abrasive is used for pelletizing to produce green balls with a diameter of 10mm-16mm; the green balls are dried and dehydrated, and roasted at low temperature in a weak reducing atmosphere. Arsenic and oxidizing atmosphere roasting desulfurization, high-temperature roasting in weak reducing atmosphere to remove tin and zinc; drying system, drying temperature is 300 ° C, drying time is 6 min; weak reducing atmosphere low-temperature roasting system, roasting temperature is 500 ° C, roasting time is 5 min, smoke The volume concentration of CO in the air is 12%; the roasting system in an oxidizing atmosphere, the roasting temperature is 725°C, the roasting...

Embodiment 3

[0031] Embodiment 3: According to the ratio of 1.0% of the mass percentage of the tin-containing zinc-arsenic iron ore concentrate, add coal sodium humate binder for batching and mixing to obtain a mixture; Water with a percentage of 8.0% is used for moistening and grinding, and the moistening time is 7 minutes to obtain a wet abrasive; the moistened abrasive is used for pelletizing to obtain green balls with a diameter of 10mm to 16mm; the green balls are dried and dehydrated, and roasted at a low temperature in a weak reducing atmosphere. Arsenic and oxidizing atmosphere roasting desulfurization, high-temperature roasting in weak reducing atmosphere to remove tin and zinc; drying system, drying temperature is 300 ° C, drying time is 6 min; weak reducing atmosphere low-temperature roasting system, roasting temperature is 500 ° C, roasting time is 5 min, smoke The volume concentration of CO in the air is 12%; the roasting system in an oxidizing atmosphere, the roasting temperat...

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Abstract

The invention discloses a method for selectively roasting and separating tin, zinc and arsenic in compound iron ore containing tin, zinc and arsenic. The method comprises the following steps of: burdening iron concentrate containing tin, zinc and arsenic with a bonding agent, mixing uniformly, performing damp milling and pelletizing; drying and dehydrating green balls; removing arsenic by performing low-temperature roasting in a first weak reduction atmosphere; removing sulfur by roasting in an oxidizing atmosphere; and removing tin and zinc by performing high-temperature roasting in a second weak reduction atmosphere to obtain pre-reduced pellet ore. The obtained pre-reduced pellet ore can be used for producing metalized pellets (DRI (Direct Reduced Iron)), and can be taken as a blast furnace iron-making furnace material. Due to the adoption of the method, concentrated treatment and recovery of toxic and harmful elements, i.e., arsenic and sulfur are realized; and the oxides of tin, zinc and arsenic can be separated and recovered segmentally from flue gas, so that the environment is protected. Large-scale processing and efficient utilization of compound iron ore containing tin, zinc and arsenic can be realized.

Description

technical field [0001] The invention belongs to the field of extraction metallurgy and mineral processing, and relates to a method for separating tin, zinc and arsenic from tin-zinc-arsenic composite iron ore, in particular to a method for separating tin-zinc-arsenic composite iron ore by using selective roasting technology Tin, zinc, arsenic method. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B5/16C22B19/00C22B25/00C22B30/04
CPCY02P10/20
Inventor 李光辉张元波姜涛范晓慧贾志鹏李骞郭宇峰杨永斌陈许玲饶明军罗骏陈丽勇史唐明
Owner CENT SOUTH UNIV