A kind of method, product and application of alkali residue recycling

A technology of recycling and alkali slag, which is applied in the field of solid waste recycling, can solve the problems of unfriendly production process, impact on application, high price, etc., and achieve the avoidance of secondary environmental pollution, excellent quality transmission channels, and high-efficiency resources the effect of

Active Publication Date: 2022-06-21
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, strong alkaline or acidic activators are required in the production process of commercial activated carbon. The production process is not friendly to the environment, it is difficult to produce in batches, and the price is relatively expensive. It is difficult to apply to the restoration of a wide range of organically polluted water bodies.
In addition, commercial activated carbon contains a large number of irregular microporous structures (pore size less than 2nm), which may cause molecular sieve effect when adsorbing organic pollutants such as antibiotics and phthalates with large molecular sizes, limiting the mass transfer process and affecting its ability to remove antibiotics from water. and phthalate applications

Method used

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  • A kind of method, product and application of alkali residue recycling
  • A kind of method, product and application of alkali residue recycling

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Experimental program
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Effect test

Embodiment 1

[0047] The method for recycling alkali residues provided by the present embodiment comprises the following steps:

[0048] Alkali residue and agricultural, forestry and animal husbandry biomass corncob are respectively placed at 110 ° C for drying, and crushed to prepare alkali residue powder and agricultural, forestry and animal husbandry biomass powder. ratio 2:1) to obtain a mixture. The mixture was placed in a corundum crucible, placed in a tubular muffle furnace, heated to 900°C at a rate of 5°C / min, held for 1 h, and then cooled to room temperature, with a nitrogen flow rate of 300mL / min throughout the process, and the ash was removed. The black residue was crushed and placed in a beaker. Use hydrochloric acid solution, ultrapure water, sodium carbonate solution, hydrochloric acid solution, hydrofluoric acid solution, ultrapure water successively for cleaning, specifically: filter cleaning by heating and stirring mode in the cleaning process, the hydrochloric acid solut...

Embodiment 2

[0052] The method for recycling alkali residues provided by the present embodiment comprises the following steps:

[0053] The alkali slag and agricultural, forestry and animal husbandry biomass sawdust were placed at 110 ° C for drying, and crushed to prepare alkali residue powder and agricultural, forestry and animal husbandry biomass powder. 0.5:1) to obtain a mixture. Put the mixture in a corundum crucible, then put the corundum crucible into a tubular muffle furnace, heat up to 800°C at a rate of 1°C / min, hold for 0.5h, and then cool down to room temperature, with a nitrogen flow rate of 400mL / min throughout the process , take out the gray-black residue and pulverize it and place it in a beaker. Use hydrochloric acid solution, ultrapure water, sodium carbonate solution, hydrochloric acid solution, hydrofluoric acid solution, ultrapure water successively for cleaning, specifically: filter cleaning by heating and stirring mode in the cleaning process, the hydrochloric acid...

Embodiment 3

[0055] The method for recycling alkali residues provided by the present embodiment comprises the following steps:

[0056] The alkali residue and agricultural, forestry and animal husbandry biomass corncob are respectively placed at 110 ° C to be dried and crushed to prepare alkali residue powder and agricultural, forestry and animal husbandry biomass powder. 3:1) to obtain a mixture. The mixture was placed in a corundum crucible, and then the corundum crucible was placed in a tubular muffle furnace, heated to 600°C at a rate of 10°C / min, held for 5 hours, and then cooled to room temperature, with a nitrogen flow rate of 50mL / min throughout the process. Take out the gray-black residue and pulverize it and place it in a beaker. Use hydrochloric acid solution, ultrapure water, sodium carbonate solution, hydrochloric acid solution, hydrofluoric acid solution, ultrapure water successively for cleaning, specifically: filter cleaning by heating and stirring mode in the cleaning pro...

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Abstract

The invention discloses a method, product and application of alkali slag recycling, belonging to the field of solid waste recycling. The specific steps of the method are: a) preparing alkali residue powder and agricultural, forestry and animal husbandry biomass powder respectively, and mixing them uniformly to obtain a mixture; b) carbonizing the mixture under the protection of an inert gas, the specific operation is: heating up to 600-900°C, and Carbonize at 600-900°C for a certain period of time, then cool down to room temperature to obtain a gray-black residue; c) crush the gray-black residue and clean the gray-black residue; d) dry and grind the gray-black residue to powder , to obtain the product. The invention uses the above preparation method to obtain a carbon-based material with more developed pore structure and better adsorption performance than commercial activated carbon, and exhibits high removal efficiency for organic pollutants. The invention not only realizes efficient resource utilization of alkali slag and biomass, but also prepares low-cost and high-efficiency organic pollutant adsorption and removal products.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and more particularly relates to a method, product and application for recycling alkali residues. Background technique [0002] Ammonia-alkali method is the main process for the industrial production of soda ash-sodium carbonate, that is, calcining quicklime to generate lime milk, adding ammonium chloride to produce ammonia gas, and reacting with refined salt to produce sodium carbonate. It is worth noting that in this process, a large amount of solid waste will be produced, that is, alkali slag, which is mainly composed of calcium oxide, magnesium oxide, silicon dioxide, aluminum oxide, calcium hydroxide, calcium chloride, calcium sulfate and other substances. . According to statistics, for every 1t of sodium carbonate produced, 0.3t of alkali residue will be produced. According to reports, my country's soda ash industry produces about 10,000,000 tons of caustic soda slag every year, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/26B01J20/30
CPCB01J20/20B01J20/28064B01J20/28071B01J20/28083B01J2220/4887
Inventor 纪荣婷程虎张龙江苏良湖陈梅陈苏娟韩建刚
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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