Method for performing microwave arsenic removal on high-arsenic iron ore

An arsenite and microwave technology, which is applied in the field of microwave dearsenic through high arsenite, can solve problems such as being unsuitable for large-scale industrial production of iron and steel, and achieve the effects of shortening roasting time, flexible operation and low energy consumption

Inactive Publication Date: 2014-04-09
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bacterial oxidation and gold extraction can be roughly divided into three stages: ① use bacterial culture medium to cultivate Thiobacillus ferrothiobacillus, etc., and prepare sulfuric acid bacterial infusion with pH = 1.5-2.5; ② Bacterial catalytic oxidation to remove arsenic and sulfur; ③ Pretreatment The obtained slag is then subjected to cyanidation (or other methods) to extract gold, and the pretreatment solution is activated by bacteria and then recycled, etc., which can provide a reference for the effective utilization of high-arsenic micro-disseminated gold ore resources, but it is not suitable for large-scale steel industry. Production

Method used

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  • Method for performing microwave arsenic removal on high-arsenic iron ore
  • Method for performing microwave arsenic removal on high-arsenic iron ore
  • Method for performing microwave arsenic removal on high-arsenic iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This example uses arsenic-containing iron ore from a mine in Inner Mongolia. The ore composition is shown in Table 1. The raw material added is coal powder. The specific implementation steps are as follows:

[0021] Table 1 Elemental composition of an iron ore in Inner Mongolia (%)

[0022]

[0023] 1) Take 500g of arsenic-containing iron ore, grind it to less than 1mm, add coal powder according to 5% of the mass of arsenic-containing iron ore, mix evenly, and put it into a corundum crucible.

[0024] 2) Put the crucible in a microwave oven and bake at a temperature of about 950°C for 10 minutes. After cooling, send the sample to an atomic fluorescence analyzer for analysis. It is obtained that the As content in the sample after roasting is 0.053%, and the arsenic removal rate is 90.54%, the same ratio, the same conditions in the muffle furnace roasting arsenic removal rate is only 80.14%.

[0025] 3) Arsenic-containing tail gas enters the tail gas collection device...

Embodiment 2

[0027] What this example selects is the arsenic-containing iron ore of a certain mine in Guangxi. The ore composition is shown in Table 2, and the raw material added is coal powder.

[0028] Table 2 Elemental composition table of an iron ore in Guangxi (%)

[0029]

[0030] 1) Take 500g of arsenic-containing iron ore, grind it to less than 1mm in a vibration mill, add carbon powder according to 6% of the mass of arsenic-containing iron ore, mix evenly, and put it into a corundum crucible.

[0031] 2) Put the crucible in a microwave oven and roast it at a temperature of about 1000°C for 15 minutes. Send the roasted sample to an atomic fluorescence analyzer for analysis. It is obtained that the As content in the roasted sample is 0.02%, and the arsenic removal rate is 92.73%, the effect is remarkable.

[0032] 3) Arsenic-containing tail gas enters the tail gas collection device to reduce environmental pollution.

Embodiment 3

[0034] This example selects arsenic-containing iron ore from a mine in Inner Mongolia. The ore composition is shown in Table 3, and the added raw material is coal powder. The specific implementation steps are as follows:

[0035] Table 3 Element composition table of an iron ore in Inner Mongolia (%)

[0036]

[0037] 1) Take 500g of arsenic-containing iron ore, grind it to less than 1mm in a vibrating mill, add coal powder according to 8% of the mass of arsenic-containing iron ore, mix evenly, and put it into a corundum crucible.

[0038] 2) Put the crucible in a microwave oven and roast it at a temperature of about 1050°C for 20 minutes. Send the roasted sample to an atomic fluorescence analyzer for analysis. It is obtained that the As content in the roasted sample is 0.008%, and the arsenic removal rate is 98.57%, the effect is remarkable.

[0039] 3) Arsenic-containing tail gas enters the tail gas collection device to reduce environmental pollution.

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Abstract

The invention discloses a method for performing microwave arsenic removal on high-arsenic iron ore and belongs to the technical field of mineral separation. The method comprises the following steps: crushing the high-arsenic iron ore until the granularity is less than 1mm, adding a proper amount of pulverized coal, uniformly mixing, performing microwave roasting in an industrial microwave oven, controlling the temperature at 800-1200 DEG C, wherein the roasting time is 5-30 minutes, the arsenic is separated from the iron ore in a gas state form, low-arsenic iron ore concentrate which meets the industrial requirements is obtained, and the generated arsenic-containing tail gas is recycled by virtue of a flue gas absorption device arranged on the industrial microwave oven. According to the method, effective separation between the arsenic and the iron ore is promoted by utilizing selective heating of microwave on the iron ore, the arsenic removal rate is over 90 percent, and the method is a high-efficiency low-cost method for removing arsenic from the iron ore.

Description

technical field [0001] The invention relates to the technical field of ore dressing, in particular to a method for removing arsenic from high-arsenic iron ore by microwave. Background technique [0002] With the rapid development of my country's iron and steel industry, my country's steel output has reached 700 million tons in 2011, but the contradiction between supply and demand of iron ore resources in my country has become increasingly prominent. In 2011, iron ore imports reached 686 million tons. At present, iron ore resources are becoming increasingly tense, and the current high-arsenic ore reserves in my country are 1.88 billion tons, but due to the high arsenic content, they have not been developed and utilized. As is a congener element of P, which is extremely harmful to steel. When As enters the steel, it will cause "hot embrittlement", which makes the steel easy to crack during processing and reduces the impact toughness of the steel. my country has a large amount...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02
Inventor 王海川张雷陈鹏飞尹振兴廖直友
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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