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Method for producing iron pellet with sulfur acid residue containing large contents of impurities and enriching valuable metal

A technology for valuable metals and sulfuric acid slag, which is applied in the field of producing iron pellets and enriching valuable metals. It can solve the problems that affect the full utilization of high-impurity sulfuric acid slag, limit the comprehensive utilization of sulfuric acid slag and iron resources, and improve metal recovery. efficiency, avoiding the effect of oxidizing atmosphere

Inactive Publication Date: 2012-07-04
个旧市富祥工贸有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is precisely because of the influence of impurity arsenic that the comprehensive utilization of iron resources in sulfuric acid slag is limited. The effect of arsenic removal is a technical obstacle that affects the full utilization of high-impurity sulfuric acid slag, and it is an urgent technical problem that needs to be solved.

Method used

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  • Method for producing iron pellet with sulfur acid residue containing large contents of impurities and enriching valuable metal
  • Method for producing iron pellet with sulfur acid residue containing large contents of impurities and enriching valuable metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Using the sulfuric acid slag shown in Table 1 as the raw material, add 6% reducing agent to the sulfuric acid slag, including 4% lignite and 2% coke powder. The length-to-diameter ratio of the kiln is 12; the inclination is 4%; the rotation speed is 0.8 r / min, the temperature of the kiln head is controlled at 800-850°C, the temperature of the kiln tail is 400-450°C, and the kiln is fired in a weak reducing atmosphere for 90 minutes. After the calcined sand leaves the kiln, it is directly sent to the cylindrical mixer, and 3% ferrous chloride and 2.5% sodium-based bentonite are added by the weight of the calcined sand, both of which are diluted with water and then added, and then added with 2% lignite and 1% coke powder , and control the moisture content of the material at 11~12%. After fully stirring and mixing in the mixer, send it to the disc granulator to make pellets with a particle size of 20~30mm, and then send it to the chain machine at a temperature of 400~1000°C...

Embodiment 2

[0043] Using the sulfuric acid slag shown in Table 1 as the raw material, add 9% reducing agent to the sulfuric acid slag, including 4% lignite and 5% coke powder, and control the basicity of the ingredients to 0.67. The length-to-diameter ratio of the kiln is 15; the inclination is 5%; the rotation speed is 1.2 r / min. The temperature of the kiln head is controlled at 850-900°C, the temperature of the kiln tail is 450-500°C, and the kiln is fired in a weak reducing atmosphere for 80 minutes. After the calcined sand leaves the kiln, it is directly sent to the cylinder mixer, and 4% ferrous chloride and 1.5% calcium-based bentonite are added by the weight of the calcined sand, both of which are diluted with water and then added, and then 3% lignite is added, and the moisture content of the material is controlled. 11~12%, fully stirred and mixed in the mixer, then sent to the pan granulator to make pellets with a particle size of 20~30mm, and then sent to the chain dryer for casca...

Embodiment 3

[0045] Using the sulfuric acid slag shown in Table 1 as the raw material, add 7% reducing agent to the sulfuric acid slag, including 1% lignite and 6% coke powder, and control the basicity of the ingredients to 0.6. The length-to-diameter ratio of the kiln is 12; the inclination is 6%; the rotation speed is 1.1 r / min, the temperature of the kiln head is controlled at 750-800°C, the temperature of the kiln tail is 350-400°C, and the kiln is fired in a weak reducing atmosphere for 100min. After the calcined sand leaves the kiln, it is directly sent to the cylinder mixer, and 5% ferrous chloride and 3% sodium bentonite are added by the weight of the calcined sand, both of which are diluted with water and then added, and then added with 1% lignite and 3% coke powder , and control the moisture content of the material at 11~12%, fully stir and mix in the mixer, and then send it to the pan granulator, use the pan granulator to make pellets with a particle size of 20~30mm, and then sen...

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Abstract

The invention discloses a method for producing iron pellets with sulfur acid residue containing large contents of impurities and enriching valuable metal. The method comprises the following steps: reducing and calcining under a moderate temperature, preparing the iron pellets, chlorinating and calcining under a high temperature, reducing the temperature of the iron pellets while recycling heat energy, collecting dust in flue gas and purifying the flue gas, adding a reducing agent of which the weight is 6 to 9 percent that of the sulfur acid residue on the condition that the kiln head temperature ranges from 750 to 900 DEG C, the kiln tail temperature ranges from 350 to 500 DEG C, and the reducing and calcining step lasts for 70 to 100 min; calcining sand in a high temperature on the condition that 3 to 5 percent of ferrous chloride, 2 to 3 percent of adhesive, and 2 to 3 percent of lignite and / or coke powder are added; pelletizing; carrying out the high-temperature chlorinating and calcining step after dry pre-heating; and recycling heat energy, collecting dust, and purifying the flue gas to achieve the emission standard. According to the invention, two sections of a rotary kiln are adopted for fulfilling the reducing and calcining step and the high-temperature chlorinating and calcining step respectively, wherein a large quantity of arsenic is extracted, part of zinc is reduced and volatilized, the chlorination calcining ensures the reduction and the volatilization of residual arsenic, zinc, tin, lead and copper are chlorinated and volatilized, and sulphur is oxidized into sulfur dioxide and enters the flue gas, so as to obtain qualified the iron pellets. The method has the advantages that the iron recovery rate is 92 to 95; the arsenic extraction rate is larger than 95 percent; the desulfuration rate is equal to or larger than 90 percent; the volatilization rates of the lead, tin and zinc are 60 to 70 percent; and the volatilization rate of copper is about 30 percent.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal smelting, especially the technical field of tin metallurgical equipment, and specifically relates to a production iron pellet with stable process, easy operation, and the ability to effectively remove various impurities in high-impurity sulfuric acid slag and enrich valuable iron pellets. metal method. Background technique [0002] With the development of the iron and steel industry, the natural resources of iron ore are increasingly scarce, and many countries have started research on the secondary utilization of iron-containing resources very early. The boiling slag and soot after sulfuric acid production from pyrite is collectively referred to as "sulfuric acid slag". Due to its high iron content and low impurity content, it has been an important resource for secondary development and utilization for many years. Japan was the first country to research, develop and utilize sulfuric aci...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B7/00
CPCY02P10/20
Inventor 谢官华李果吴建民刘勇
Owner 个旧市富祥工贸有限责任公司
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