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

Method for purifying tail gas of acid production and recovering manganese and lithium by using waste lithium manganate

A technology for waste lithium manganate and acid production tail gas, applied in chemical instruments and methods, manganate/permanganate, separation methods, etc., can solve the problems of secondary pollution, high cost, and difficulty in reducing recovery costs, etc. To achieve the effect of easy operation and low cost

Active Publication Date: 2017-05-10
LANZHOU UNIVERSITY OF TECHNOLOGY
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lime absorption method uses lime water or lime milk to wash the acid tail gas. This method has mature technology and low production cost, but SO 2 The absorption rate is slow, the absorption capacity is small, and the generated CaSO 3 and CaSO 4 It is easy to block pipelines and equipment. In addition, this method produces a large amount of waste residue, which causes serious secondary pollution to the environment.
The ammonia absorption method uses liquid ammonia or ammonia water as the absorbent, which has high absorption efficiency and complete desulfurization, but ammonia is easy to volatilize, and the consumption of absorbent is large, and the source of ammonia is greatly restricted by the region
The sodium hydroxide absorption method is to use sodium hydroxide to treat the tail gas of acid production, SO 2 The absorption capacity is large, the absorption rate is fast, and the efficiency is high, but the biggest problem is that the raw material sodium hydroxide is expensive, and the cost of acid tail gas treatment is high
In addition, other methods for treating tail gas from acid manufacturing generally have several common problems: 1) the price of raw materials used is high, the investment is large, and the cost of operation and maintenance is high; 2) the added value of by-products obtained after the treatment of tail gas from acid manufacturing is low
[0006] In the reported methods for recovering valuable metals from waste lithium manganese oxide, the recovery technology must still use a large amount of related chemical reagents, such as sulfuric acid, hydrogen peroxide, citric acid, malic acid, hydrochloric acid, nitric acid, sodium bisulfate, sodium pyrosulfate, etc. This makes it difficult to reduce the recovery cost of the current technology for recovering valuable metals from waste lithium manganate

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
  • Method for purifying tail gas of acid production and recovering manganese and lithium by using waste lithium manganate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Collect scrap lithium-ion batteries with lithium manganate as positive electrode material, place them in 0.5mol / L sodium hydroxide aqueous solution at room temperature for 2h discharge treatment; after discharge treatment, disassemble the scrap lithium-ion batteries to obtain Positive electrode sheet; The ratio (g / mL) of the positive electrode sheet that is obtained is 1:10 by the ratio (g / mL) of the volume of the quality of positive electrode sheet and ceramic crucible, and positive electrode sheet is packed in the ceramic crucible, then is placed in box-type electric resistance furnace from room temperature Start to raise the temperature of the furnace to 550°C at a heating rate of 5°C / min and keep it warm for 0.5h, then cool down to room temperature naturally after power off; take out the roasted positive electrode sheet, according to the ratio of the mass of the positive electrode sheet to the volume of water (g / mL ) at a ratio of 1:50, put the positive electrode she...

Embodiment 2

[0034] Collect scrap lithium-ion batteries with lithium manganate as positive electrode material, place them in 0.5mol / L sodium hydroxide aqueous solution at room temperature for 2h discharge treatment; after discharge treatment, disassemble the scrap lithium-ion batteries to obtain Positive electrode sheet; The ratio (g / mL) of the positive electrode sheet that is obtained is 1:10 by the ratio (g / mL) of the volume of the quality of positive electrode sheet and ceramic crucible, and positive electrode sheet is packed in the ceramic crucible, then is placed in box-type electric resistance furnace from room temperature Start to raise the temperature of the furnace to 550°C at a heating rate of 5°C / min and keep it warm for 0.5h, then cool down to room temperature naturally after power off; take out the roasted positive electrode sheet, according to the ratio of the mass of the positive electrode sheet to the volume of water (g / mL ) at a ratio of 1:50, put the positive electrode she...

Embodiment 3

[0036] Collect scrap lithium-ion batteries with lithium manganate as positive electrode material, place them in 0.5mol / L sodium hydroxide aqueous solution at room temperature for 2h discharge treatment; after discharge treatment, disassemble the scrap lithium-ion batteries to obtain Positive electrode sheet; The ratio (g / mL) of the positive electrode sheet that is obtained is 1:10 by the ratio (g / mL) of the volume of the quality of positive electrode sheet and ceramic crucible, and positive electrode sheet is packed in the ceramic crucible, then is placed in box-type electric resistance furnace from room temperature Start to raise the temperature of the furnace to 550°C at a heating rate of 5°C / min and keep it warm for 0.5h, then cool down to room temperature naturally after power off; take out the roasted positive electrode sheet, according to the ratio of the mass of the positive electrode sheet to the volume of water (g / mL ) at a ratio of 1:50, put the positive electrode she...

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 relates to a method of purifyingtailgas from acid production with waste lithium manganate and recovering manganese and lithium. The method includes the steps that a waste lithium ion battery is discharged and disassembled to obtain a waste positive plate, and the waste positive plate is roasted, dissolved with water and filtered to obtain waste lithium manganate; waste lithium manganate and sodium sulfate are mixed and subjected to ball milling, and a ball milling product is put into an absorbing device; the tailgas from acid production is converted and then introduced into the absorbing device, gas which is discharged by the absorbing device and meets the emission standard is exhausted to atmosphere, a mixture in the absorbing device is taken out and leached with water, a sodium carbonate solution is added into the solution, then filtration is carried out, filter residues are supplemented with lithium carbonate and then are subjected to ball milling, compacting and roasting, and the lithium manganatepositive pole material good in electrochemical performance is obtained again. Filter liquor is crystallized to obtain sodium sulfate again.

Description

technical field [0001] The invention relates to the technology of using waste lithium manganese oxide to purify acid production tail gas and recover manganese and lithium. Background technique [0002] Sulfuric acid is widely used in chemical fertilizer industry, metallurgical industry, petroleum industry, machinery industry, pharmaceutical industry, detergent production, military industry, atomic energy industry and aerospace industry, etc. However, the sulfuric acid industry is also a highly polluting chemical industry. The tail gas produced in the sulfuric acid production process contains sulfur dioxide and sulfuric acid mist. The acid production tail gas of the sulfuric acid industry emits a large amount of gas pollutants such as sulfur dioxide into the atmosphere every year, seriously polluting the environment. On December 30, 2010, my country promulgated the Discharge Standard of Pollutants for the Sulfuric Acid Industry (GB26132-2010), which has clear requirements fo...

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): C01G45/12B01D53/86B01D53/50
CPCB01D53/14B01D53/8609B01D2255/20723C01G45/12
Inventor 王大辉陈怀敬
Owner LANZHOU UNIVERSITY OF TECHNOLOGY