Synthesis of novel coal flotation agent

A flotation agent and coal technology, applied in flotation, solid separation and other directions, can solve problems such as single flotation function, and achieve the effects of high flotation efficiency, simple preparation method and low cost

Active Publication Date: 2014-09-10
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above new flotation agents only have a single flotation function, and need to add foaming agent to achieve the flotation effect

Method used

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  • Synthesis of novel coal flotation agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 24g of phthalic anhydride, 50mL of n-butanol and several zeolites into a dry 250mL three-necked flask, and slowly add 0.4mL of concentrated sulfuric acid dropwise under shaking. Slowly raise the temperature to 120°C to make the reaction mixture boil slightly. After about 15 minutes, the solid in the flask completely disappears. At this time, the azeotrope of n-butanol and water gradually evaporates, and the small water droplets at the bottom of the water separator gradually flow out after condensation. When the bottom of the water separator is reached, stop heating when the water volume no longer increases. After the reaction solution was cooled, the reaction mixture was poured into a separatory funnel, neutralized with 5% sodium carbonate solution until the organic layer was neutral, and the separated oil was dried with anhydrous magnesium sulfate until clear. The liquid separated by filtration was evaporated under reduced pressure to remove excess n-butanol and a ...

Embodiment 2

[0025] Add 24g of phthalic anhydride, 80mL of n-butanol and several zeolites into a dry 250mL three-neck flask, and slowly add 1.4mL of concentrated sulfuric acid dropwise under shaking. Slowly raise the temperature to 160°C to slightly boil the reaction mixture. After about 30 minutes, the solids in the flask disappear completely. At this time, the azeotrope of n-butanol and water gradually evaporates, and the small water droplets condensed at the bottom of the water separator gradually flow out. When the bottom of the water separator is reached, stop heating when the water volume no longer increases. After the reaction solution was cooled, the reaction mixture was poured into a separatory funnel, neutralized with 1% sodium carbonate solution until the organic layer was neutral, and the separated oil was dried with anhydrous magnesium sulfate until clear. The liquid separated by filtration was evaporated under reduced pressure to remove excess n-butanol and a small amount of ...

Embodiment 3

[0028] Involving the application process of the present invention:

[0029] Get 100g of coal slime, add 400ml of water to it and stir, add 0.01g of the flotation agent prepared in Example 1 to it after standing still and feed air for 3min, leave standstill for 30min, significant stratification occurs in coal slime, last time it was suspended Coal, the lower layer is mud, and the flotation efficiency of coal slime reaches 90%.

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Abstract

The invention relates to a synthesis of a novel coal flotation agent. The synthesis includes adding concentrated acid into phthalic anhydride and n-butyl alcohol dropwise slowly, slightly boiling a reaction mixture, when the reaction mixture is cooled to 30-70 DEG C, neutralizing the reaction mixture via a sodium carbonate solution till an organic layer is neutral, removing the excess n-butyl alcohol and water by means of reduced pressure distillation after separation, adding diethanol amine into an oil bath pan dropwise slowly with heating and stirring, and removing the unreacted n-butyl alcohol and diethanol amine by means of reduced pressure distillation after cooling so as to obtain o-butyl formate benzoic acid alkanolamide, namely the novel coal flotation agent. The defects that an existing coal flotation agent only has a signal floatation function and a foaming agent needs to be added additionally are overcome. The novel coal flotation agent has the floatation function as well as a foaming function, and is simple in preparation method, low in cost and high in floatation efficiency.

Description

technical field [0001] The invention belongs to the field of coal separation, in particular to the synthesis of a novel coal flotation agent. Background technique [0002] Coal is the fossil fuel with the most abundant reserves in the world. The supply and demand of coal resources directly affect the changes in the world economic structure and the people's livelihood. The current world coal reserves are estimated at 1083Gt, which is enough to be mined for more than 200 years based on the current coal consumption level. However, due to the heterogeneity of the temporal and spatial distribution of the world's coal resources and the different proportions of coal consumption in various countries, the changes in the supply and demand of coal resources and the contradiction between supply and demand have directly affected the development of economic strategies in various countries. [0003] Coal is an important basic energy source in my country. The basic characteristics of my c...

Claims

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Application Information

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IPC IPC(8): B03D1/01
Inventor 程志林李登阳刘赞
Owner YANGZHOU UNIV
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