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Industrial waste recycling method

An industrial waste and recycling technology, applied in the field of industrial waste recycling, can solve the problem that the tensile strength, flexural strength, elastic modulus and thermal deformation temperature cannot be greatly improved, the calcium sulfate whisker cannot be controlled, and the temperature can not be controlled. High requirements are required to achieve the effect of improving purity and performance, whisker length, and uniform distribution

Active Publication Date: 2019-05-10
雅邦绿色过程与新材料研究院南京有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are obvious defects and deficiencies in the above-mentioned calcium sulfate whisker preparation method: (1) the reaction process needs to adopt a special heating method for heating and heat preservation, so as to ensure that the heat in the heating process is uniform and stable, and this process requires high temperature control; (2) In order to achieve precise temperature control in the reaction process, the calcium chloride solution of alkali-making waste liquid needs to be preheated in advance, and must be consistent with the temperature of waste sulfuric acid
However, there are obvious defects and deficiencies in the above-mentioned method for preparing calcium sulfate whiskers: the diameter of the calcium sulfate whiskers is still relatively large, and the length of the whiskers is still relatively short, which eventually leads to a still low aspect ratio, and the prepared calcium sulfate whiskers cannot be high-grade. The needs of plastic products can not greatly improve the tensile strength, bending strength, elastic modulus and heat distortion temperature, etc.

Method used

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Effect test

Embodiment 1

[0027] A resource utilization method for industrial waste, the industrial waste including hydrochloric acid waste liquid and sulfuric acid waste liquid, the resource utilization method comprises the following steps:

[0028] 1) Crush the shells, and then add hydrochloric acid waste liquid, the molar ratio of hydrochloric acid in the hydrochloric acid waste liquid to calcium carbonate in shells is 2:1, stir, and react for 1 hour to obtain reaction liquid A;

[0029] 2) filter the reaction solution A to obtain the filtrate;

[0030] 3) Heat the filtrate to 80°C, add carboxymethyl cellulose sodium salt, sodium tripolyphosphate and chelating agent I, then add sulfuric acid waste liquid dropwise at a uniform speed, react for 1 hour, and obtain reaction liquid B, the sulfuric acid waste liquid in the sulfuric acid waste liquid The molar ratio to calcium carbonate in shells is 0.9:1;

[0031] 4) The reaction solution B was filtered, the filter cake was washed with hot water at 80°C,...

Embodiment 2

[0040] A resource utilization method for industrial waste, the industrial waste including hydrochloric acid waste liquid and sulfuric acid waste liquid, the resource utilization method comprises the following steps:

[0041] 1) Pulverize the shells, then add waste hydrochloric acid, the molar ratio of hydrochloric acid in the waste hydrochloric acid to calcium carbonate in the shells is 2.1:1, stir, and react for 1.5h to obtain reaction solution A;

[0042] 2) filter the reaction solution A to obtain the filtrate;

[0043] 3) Heat the filtrate to 80°C, add carboxymethylcellulose sodium salt, sodium tripolyphosphate and chelating agent I, then add sulfuric acid waste liquid dropwise at a uniform speed, and react for 1.5 hours to obtain reaction liquid B. The molar ratio of sulfuric acid to calcium carbonate in shells is 1:1;

[0044] 4) The reaction solution B was filtered, the filter cake was washed with hot water at 80°C, and then dried under reduced pressure at 120°C for 2 ...

Embodiment 3

[0053] A resource utilization method for industrial waste, the industrial waste including hydrochloric acid waste liquid and sulfuric acid waste liquid, the resource utilization method comprises the following steps:

[0054] 1) Pulverize the shells, and then add waste hydrochloric acid, the molar ratio of hydrochloric acid in the waste hydrochloric acid to calcium carbonate in shells is 2.2:1, stir, and react for 2 hours to obtain reaction solution A;

[0055] 2) filter the reaction solution A to obtain the filtrate;

[0056] 3) Heat the filtrate to 80°C, add carboxymethyl cellulose sodium salt, sodium tripolyphosphate and chelating agent I, then add sulfuric acid waste liquid dropwise at a uniform speed, react for 2 hours, and obtain reaction liquid B, the sulfuric acid waste liquid in the sulfuric acid waste liquid The molar ratio to calcium carbonate in shells is 1:1;

[0057] 4) The reaction solution B was filtered, the filter cake was washed with hot water at 80°C, and t...

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Abstract

The invention relates to an industrial waste recycling method which includes the steps: 1) crushing shells, adding hydrochloric acid waste liquid and stirring the shells and the hydrochloric acid waste liquid to obtain reaction liquid A; 2) filtering the reaction liquid A to obtain filtrate; 3) heating the filtrate, adding sodium carboxymethyl cellulose salt, sodium tripolyphosphate and chelatingagents and then dropping sulfuric acid waste liquid at a constant speed to obtain reaction liquid B; 4) filtering the reaction liquid B, cleaning filter cakes with hot water and performing drying under reduced pressure to obtain calcium sulfate whiskers; 5) adding the calcium sulfate whiskers prepared in the step 4) into a composite material. Industrial waste is turned into wealth, and environmental pollution caused by the industrial waste is reduced.

Description

technical field [0001] The invention relates to a resource utilization method of industrial waste. Background technique [0002] Since 1996, my country has been the world's largest steel producer for many years in a row. With the development of construction, machinery, light industry and home appliances, the production scale of my country's steel industry is still expanding. Pickling is a method of cleaning metal surfaces, and it is also a necessary process for steel production and processing. Its purpose is to remove oxides on the metal surface. During the pickling process, the acid cleaning agent contacts and reacts with the metal surface. With the decrease of the concentration of ammonia ions in the acid and the increase of the concentration of metal ions, the pickling efficiency of the acid solution is also continuously reduced, and it becomes a waste that needs to be discharged. Pickling waste. At present, the main acid cleaning agents in the steel pickling process ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/46C30B29/62C30B7/14
Inventor 不公告发明人
Owner 雅邦绿色过程与新材料研究院南京有限公司