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Method and system used for high arsenic phosphorus ore pre-dearsenization

A high-arsenic phosphate rock, pre-removal technology, applied in chemical instruments and methods, arsenic oxide/arsenic hydroxide/oxyacid arsenic, arsenic compounds, etc., can solve a large amount of electrolytic waste liquid, high economic cost, production waste liquid and other problems, to achieve the effect of simple and easy process flow, broad application prospects and effective utilization

Active Publication Date: 2019-09-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reaction process is simple, but a large amount of electrolytic waste liquid will be produced, and ultrapure water needs to be prepared to provide N 2 protection, high energy consumption
[0006] In the above methods, there are problems such as relatively high economic cost, large phosphorus loss rate, long time consumption, production waste liquid and potential safety hazards.

Method used

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  • Method and system used for high arsenic phosphorus ore pre-dearsenization
  • Method and system used for high arsenic phosphorus ore pre-dearsenization

Examples

Experimental program
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Effect test

Embodiment 1

[0059] The high-arsenic phosphate rock is crushed into high-arsenic phosphate rock powder in a crusher, and then transported to the fluidized furnace, where yellow phosphorus tail gas is introduced, and burned at the bottom of the fluidized furnace to generate a large amount of heat to heat the high-arsenic phosphate rock powder. During the combustion process of yellow phosphorus tail gas, air is introduced by the blower to support combustion, and the phosphate rock powder is disturbed to be fully heated to 480°C, and arsenic is oxidized to gaseous arsenic trioxide to form arsenic dust. After 0.5h of heating time, the low-arsenic phosphate rock powder and the arsenic dust flue gas containing a small amount of phosphate rock powder produced after the reaction are exported to the fluidized fluidized furnace. Pass the flue gas of arsenic dust containing phosphate rock powder through a ceramic filter and dust collector. At this time, the filtration temperature is 400°C. tower. Th...

Embodiment 2

[0061] The high-arsenic phosphate rock is crushed into high-arsenic phosphate rock powder in a crusher, and then transported to the fluidized furnace, where yellow phosphorus tail gas is introduced, and burned at the bottom of the fluidized furnace to generate a large amount of heat to heat the high-arsenic phosphate rock powder. During the combustion process of yellow phosphorus tail gas, air is introduced through the blower to support combustion, and at the same time, the phosphate rock powder is disturbed to be fully heated to 480°C, and arsenic is oxidized to gaseous arsenic trioxide to form arsenic dust. After 1.5 hours of heating time, the low-arsenic phosphate rock powder and the arsenic dust flue gas containing a small amount of phosphate rock powder produced after the reaction are exported to the fluidized fluidized furnace. Pass the flue gas of arsenic dust containing phosphate rock powder through a ceramic filter and dust collector. At this time, the filtration tempe...

Embodiment 3

[0063] The high-arsenic phosphate rock is crushed into high-arsenic phosphate rock powder in a crusher, and then transported to the fluidized furnace, where yellow phosphorus tail gas is introduced, and burned at the bottom of the fluidized furnace to generate a large amount of heat to heat the high-arsenic phosphate rock powder. During the combustion process of yellow phosphorus tail gas, air is introduced by the blower to support combustion, and at the same time, the phosphate rock powder is disturbed to be fully heated to 530°C, and arsenic is oxidized to gaseous arsenic trioxide to form arsenic dust. After 0.5h of heating time, the low-arsenic phosphate rock powder and the arsenic dust flue gas containing a small amount of phosphate rock powder produced after the reaction are exported to the fluidized fluidized furnace. Pass the flue gas of arsenic dust containing phosphate rock powder through a ceramic filter and dust collector. At this time, the filtration temperature is ...

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Abstract

The invention belongs to the technical field of phosphorus ore purification, and provides a method used for high arsenic phosphorus ore pre-dearsenization. The method comprises following steps: first, high arsenic phosphorus ore is subjected to high temperature treatment, arsenic in high arsenic phosphorus ore powder and oxygen are reacted at 420 to 550 DEG C to generate gaseous state arsenic trioxide, and gas solid phase separation is adopted to separate arsenic from the phosphorus ore powder; and furthermore, in order to obtain pure arsenic product, flue gas containing a small amount of ore powder is subjected to dedusting and cooling crystallization to generate arsenic trioxide for recycling. The method is capable of increasing dearsenization rate of high arsenic phosphorus ore to be 80% or higher, and phosphorus loss rate is lower than 3%. The technology process is simple; arsenic trioxide can be recycled, and waste is changed into valuables; and the application prospect is promising. According to the method, heat energy generated in combustion of high concentration CO in yellow phosphorus tail gas is adopted in high temperature hot treatment of high arsenic phosphorus ore, so that cost is reduced further. The invention also provides a system used for high arsenic phosphorus ore pre-dearsenization. The system is simple in structure; and industrialized production is convenient to realize through adoption of the system in high arsenic phosphorus ore pre-dearsenization.

Description

technical field [0001] The invention relates to the technical field of phosphate rock purification, in particular to a method and system for pre-removing arsenic from high-arsenic phosphate rock. Background technique [0002] Phosphate rock is a general term for phosphate minerals that can be utilized, and is an important chemical mineral raw material. It is commonly used in industry to prepare yellow phosphorus, phosphoric acid and other phosphates, and can be used in industries such as medicine, food, dyes, ceramics and national defense. my country is rich in phosphate rock resources, but the reserves of high-grade phosphate rock are relatively low. According to the current mining mode of "mining the rich and abandoning the poor", my country's phosphate rock will be exhausted in 20 years. In recent years, with the development of the phosphate fertilizer industry, the demand for phosphate rock has increased dramatically. In this context, people began to mine low-grade pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01C01G28/00
CPCC01B25/01C01G28/005
Inventor 张秋林王兰英宁平
Owner KUNMING UNIV OF SCI & TECH
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