Unlock instant, AI-driven research and patent intelligence for your innovation.

Wet deep dearsenification method for high-arsenic iron ores

An arsenic iron ore and arsenic removal technology, applied in the direction of improving process efficiency, can solve the problems of complex process, high concentration, impact, etc., and achieve the effect of simple process operation, easy industrialization, and small equipment investment

Inactive Publication Date: 2014-02-12
湖南省环境保护科学研究院
View PDF8 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The leaching speed of this method is fast, but the composition of the composite catalyst is complex, and the concentration of each component is high, which has an adverse effect on the purity of zinc sulfate, and its process is also complicated.
[0005] In addition, although the method of acid leaching can effectively remove the arsenic in the ore sample, it cannot achieve deep arsenic removal. The content of arsenic in the ore sample is still difficult to meet the requirements of smelting, and it is only used for pretreatment of ore sample arsenic removal. Therefore, in view of the above deficiencies, it is necessary to develop an efficient and environmentally friendly method for removing arsenic from ore samples.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 30kg of high-arsenic tailings ore sample (the content of iron reaches 37.29%, and the content of arsenic reaches 6.314%), crush it to 160 mesh, accounting for 85%, add it to the sulfuric acid solution with a concentration of 15% by mass fraction, and the solid-liquid ratio is 1 : 3, be 60 revs / min to stir 1h by stirring speed, then settling 30 minutes, then filter and carry out solid-liquid separation, solid is washed with water, the solid after washing is added in the sulfuric acid solution of massfraction 15% again, solid-liquid The ratio is 1:3, stirring at a stirring speed of 60 rpm for 1 hour, settling for 30 minutes, and then filtering for solid-liquid separation, and washing the solid with water again. , Dry the sample. The content of iron in the metal ore sample is 32.3%, the content of arsenic is 0.35%, and the removal rate of arsenic reaches 94.5%.

Embodiment 2

[0026] Weigh 30kg pyrite roasted ore sample (the content of iron reaches 54.53%, the content of arsenic reaches 3.14%), crushes to 180 meshes and accounts for 90%, and adds it to the sulfuric acid solution with a concentration mass fraction of 10%, and the solid-liquid ratio is 1 : 4, be that 60 revs / min are stirred 1h by stirring speed, then sedimentation 30 minutes, then filter and carry out solid-liquid separation, solid is washed with water, the solid after washing is added in the sulfuric acid solution of concentration massfraction 10% again, solid The liquid ratio is 1:4, stirred at a stirring speed of 60 rpm for 1 hour, then settled for 30 minutes, and then filtered for solid-liquid separation, and the solid was washed again with water. Dehydrated and dried samples. The content of iron in the metal ore sample is 43%, the content of arsenic is 0.32%, and the removal rate of arsenic reaches 90%.

Embodiment 3

[0028] Take by weighing 30kg pyrite ore sample (the content of iron reaches 32.72%, the content of arsenic reaches 4.663%), breaks to 160 order and accounts for 80%, adds the sulfuric acid of concentration mass fraction 15%, solid-liquid ratio is 1:4, Be that 80 revs / min are stirred 1h by stirring speed, then settle for 30 minutes, then filter and carry out solid-liquid separation, wash solid with water, add the sulfuric acid of concentration mass fraction 15% again to the solid after washing, solid-liquid ratio is 1: 4. Stir for 1 hour at a stirring speed of 80 rpm, then settle for 30 minutes, then filter for solid-liquid separation, and wash the solid again with water. Dry sample. The content of iron in the metal ore sample is 14.22%, the content of arsenic is 0.23%, and the removal rate of arsenic reaches 95%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a wet deep dearsenification method for high-arsenic iron ores. The method comprises the following steps: crushing arsenic-containing metal sample ores, adding the crushed arsenic-containing metal sample ores into a sulphuric acid solution with a mass fraction of 10-20% to carry out agitation leaching, and after the leaching is completed, carrying out solid-liquid separation on the obtained object, and washing obtained solids by using water; and adding the washed solids into a sulphuric acid solution with a mass fraction of 10-20% to carry out agitation leaching, and after the leaching is completed, carrying out solid-liquid separation on the obtained object, and washing obtained solids by using water, thereby obtaining dearsenified metal ores. The wet deep dearsenification method for high-arsenic iron ores disclosed by the invention is a wet process, because arsenic trioxide is an extremely toxic substance, the method has a superiority incomparable to high-temperature volatilization, and through the method, the content of ore samples subjected to wet treatment can reach about 0.2% minimally. The method disclosed by the invention is used under the condition of normal pressure and temperature; the method is small in equipment investment, easy to operate, suitable for being introduced, promoted and applied in medium-sized enterprises, and easily industrialized.

Description

Technical field: [0001] The invention relates to the field of metal ore smelting, in particular to a wet deep arsenic removal method for high-arsenic iron ore. Background technique: [0002] At present, the methods of processing high-arsenic iron ore at home and abroad can be divided into two types: one is to treat with fire methods such as oxidation roasting, reduction roasting and vacuum roasting, and the arsenic is directly recovered in the form of white arsenic; the other is to use acid leaching, Alkali leaching or salt leaching and other wet processes first separate the arsenic from the ore, and then further use the sulfidation method or other harmless treatment. Acid leaching pretreatment is another branch of ore pretreatment. It has the advantages that roasting process does not have. There is no secondary leaching problem caused by over-burning or under-burning. It has little environmental pollution and strong adaptability. It can be selected according to different or...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C22B1/11C22B3/08
CPCY02P10/20
Inventor 付广义田原向仁军
Owner 湖南省环境保护科学研究院