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

A method and system for pre-removing arsenic from high-arsenic phosphate rock

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, high energy consumption problems, to achieve the effect of simple and easy process flow, broad application prospects and simple system structure

Active Publication Date: 2021-07-27
KUNMING UNIV OF SCI & TECH
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method and system for pre-removing arsenic from high-arsenic phosphate rock
  • A method and system for pre-removing arsenic from high-arsenic phosphate rock

Examples

Experimental program
Comparison scheme
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 ...

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

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of phosphate rock purification, and provides a method for pre-arsenic removal of high-arsenic phosphate rock. First, the high-arsenic phosphate rock powder is subjected to high-temperature treatment, and the arsenic and oxygen in the high-arsenic phosphate rock powder are heated at a temperature of 420-550°C. The lower reaction generates gaseous arsenic trioxide, and the arsenic is separated from the phosphate rock powder by gas-solid phase separation. Further, in order to obtain a clean arsenic product, the flue gas containing a small amount of ore powder is dedusted and cooled to crystallize, and the white arsenic produced is recovered. The method of the invention makes the arsenic removal rate of the high-arsenic phosphate rock more than 80%, and the phosphorus loss rate is less than 3%. The invention uses the heat generated by the combustion of high-concentration CO in the yellow phosphorus tail gas to perform high-temperature heat treatment on the high-arsenic phosphate rock powder, which can further reduce the cost. The invention also provides a system for pre-removing arsenic from high-arsenic phosphate rock. The system has a simple structure, and the system can be used to carry out pre-arsenic removal from high-arsenic phosphate rock, which is easy to realize industrial production.

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

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
Patent Type & Authority Patents(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