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Comprehensive utilization method for high-arsenic pyrite

A technology of high-arsenic pyrite and arsenic pyrite, which is applied in chemical instruments and methods, sulfur compounds, and process efficiency improvement, etc., can solve the problems of low grade, undescribed heat utilization, complex process route, etc.

Inactive Publication Date: 2008-09-10
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AI Technical Summary

Problems solved by technology

There are problems of low grade of slag and complex process route
[0006] In addition, these two methods only discussed roasting and dust collection, and did not describe the use of heat and how to collect arsenic.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0020] Embodiment: Take a 150 ton / day high-arsenic acid pyrite plant with 5% arsenic as an example.

[0021] The 900°C high-temperature flue gas from the fluidized fluidized furnace enters the high-temperature cyclone, removes 60% of the mine dust, and then enters the waste heat boiler, which can produce 6 tons of steam per hour. The cooled flue gas enters the electrostatic precipitator, and the dust content at the outlet is less than 0.2g / Nm 3 , and then the flue gas is quenched through the spray tower, and the As in the flue gas 2 o 3 After crystallization, it is collected by a bag filter, and 0.45 tons of pure arsenic with a purity of ≥99% can be obtained per hour. The flue gas after collecting arsenic is used to make acid, and 6.25 tons of concentrated sulfuric acid with a concentration of >92% can be obtained per hour. Iron slag from fluidized fluidized furnace and high-temperature cyclone can reach 7 tons per hour, which can be directly used as products. The dust col...

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PUM

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Abstract

The invention belongs to the environment protection technical field. A sulfurous iron ore with high arsenic content is calcined inside a furnace in fluid bed with high temperature and low oxygen content to remove arsenic and sulfur to prepare qualified slag products; most part of the mine dust of the flue gas is removed by a dedusting device; the outgoing flue gas is cooled and dedusted; the outgoing flue gas is cooled down and the arsenic is removed, and then the flue gas enters an acid making system to prepare concentrated sulphuric acid. The invention not only avoids the environmental pollution of the sulfurous iron ore with high arsenic content but also makes the best of the resources of sulfurous iron ore with high arsenic content to prepare qualified sulphuric acid, iron slag, steam and arsenic products. The invention has sufficient recycle, small causticity to the device, stable and continuous technique, good safety and good environment protection value and economic values.

Description

Technical field: [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for comprehensive utilization of high-arsenic pyrite. Background technique: [0002] At present, a large number of high-arsenic pyrites in China are idle and useless, which not only causes a lot of waste of resources, but also constitutes a huge damage to the environment. [0003] At home and abroad, the technology of comprehensive utilization of ordinary pyrite is very mature, but the application of high-arsenic pyrite is still in the exploration stage in China, and the foreign technology is mainly two-stage roasting method. Domestic also has similar technology, and the technology relevant to the present invention has: [0004] 1. CN1363696A is a process for removing arsenic and sulfur elements from high-arsenic and high-sulfur gold concentrate. This method mainly adopts the method of adjusting raw materials into slurry and two roasting f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C01B17/74F24J3/00C22B30/04
CPCY02P10/20
Inventor 吴卫民魏兰邓坚志揭桂元周永斌
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