Method for preparing thinning ceramic additive using landfill leachate

Patent metadata

Field	Value
Publication number	US-10759686-B2
Application number	US-201816310453-A
Country	US
Kind code	B2
Filing date	Jan 23, 2018
Priority date	Jan 24, 2017
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

A method for preparing a thinning ceramic additive using a landfill leachate, comprising the following steps: filtering the landfill leachate; adding aqueous alkali and regulating pH to 7.5-9; adding a coagulant, then stirring and mixing with a blender; taking precipitates to mix with water to prepare a solution, adding a sodium hydroxide solution for alkalization, and regulating the pH to 7-8.5; adding a sulfonating agent, and reacting under an environment of 80-100° C. for 2-4 h; adding acrylic acid and N,N′-methylene bisacrylamide to the solution, then slowly adding the initiator, stirring under the condition of 80-90° C. to react for 1-3.5 h, and after the reaction is completed, drying the solution to obtain a solid matter; crushing the solid matter, and screening through a screen of 16-24 meshes; and uniformly mixing the above screened particulate matter with the montmorillonite and an additive to prepare the thinning ceramic additive.

First claim

What is claimed is:

1. A method for preparing a thinning ceramic additive using a landfill leachate as raw material to successively conduct purification, alkalization, sulfonation and graft copolymerization reactions, and adding a montmorillonite and an initiator to prepare the thinning ceramic additive, wherein the method comprises the following steps:
(1) filtering the landfill leachate to remove suspended matter and solid particles;
(2) adding aqueous alkali to the filtered landfill leachate and regulating pH to 7.5-9;
(3) adding a coagulant to the landfill leachate after regulating the pH, stirring and mixing with a blender at a rotational speed of 2000-2200 rpm for 2-4 min, regulating the rotational speed to 450-550 rpm and then stirring for 9-11 min;
(4) standing and precipitating the stirred mixed solution, taking precipitates to mix with water to prepare a solution, adding a sodium hydroxide solution for alkalization, and regulating the pH to 7-8.5;
(5) adding a sulfonating agent to the solution prepared in step (4), and allowing the solution to react under an environment of 80-100° C. for 2-4 h;
(6) adding acrylic acid and N,N′-methylene bisacrylamide to the solution after reacting in step (5), then slowly adding the initiator, stirring under the condition of 80-90° C. to react for 1-3.5 h, and after the reaction is completed, drying the solution to obtain a solid matter;
(7) crushing the solid matter prepared by drying, and screening the solid matter through a screen of 16-24 meshes; and
(8) uniformly mixing the above screened particulate matter with the montmorillonite and an additive to prepare the thinning ceramic additive.

2. The method for preparing the thinning ceramic additive using the landfill leachate according to claim 1 , wherein the added mass fractions of the components in each step are:

landfill leachate
   36%-40%;

coagulant
 0.03%-0.06%;

sulfonating agent
 0.17%-0.3%;

acrylic acid
  8.7%-10%;

N,N′-methylene bisacrylamide
0.0085%-0.01%;

Initiator
 0.017%-0.019%;

Montmorillonite
   21%-23%;

water
   25%-27%;

additive
    5%-9%.

3. The method for preparing the thinning ceramic additive using the landfill leachate according to claim 1 , wherein the solution mixed by the precipitates and the water in the step (4) has a solid content of 55%-63%.

4. The method for preparing the thinning ceramic additive using the landfill leachate according to claim 1 , wherein the coagulant is a cation coagulant and is formed by mixing more than one of malysite, aluminium salt and a polymer of malysite and aluminium salt.

5. The method for preparing the thinning ceramic additive using the landfill leachate according to claim 1 , wherein the sulfonating agent is formed by mixing more than one of sulphuric acid, oleum, chlorosulfonic acid and sulfur trioxide.

6. The method for preparing the thinning ceramic additive using the landfill leachate according to claim 1 , wherein the initiator is formed by mixing more than one of potassium persulfate, ammonium persulfate and sodium persulfate.

7. The method for preparing the thinning ceramic additive using the landfill leachate according to claim 1 , wherein the additive is formed by mixing more than one of sodium silicate, sodium tripolyphosphate, sodium metasilicate pentahydrate, sodium carbonate and sodium hexametaphosphate.

8. The method for preparing the thinning ceramic additive using the landfill leachate according to claim 1 , wherein the relative molecular mass Mn of the thinning ceramic additive is 4600-25000.

9. The method for preparing the thinning ceramic additive using the landfill leachate according to claim 2 , wherein the coagulant is a cation coagulant and is formed by mixing more than one of malysite, aluminium salt and a polymer of malysite and aluminium salt.

10. The method for preparing the thinning ceramic additive using the landfill leachate according to claim 2 , wherein the sulfonating agent is formed by mixing more than one of sulphuric acid, oleum, chlorosulfonic acid and sulfur trioxide.

11. The method for preparing the thinning ceramic additive using the landfill leachate according to claim 2 , wherein the initiator is formed by mixing more than one of potassium persulfate, ammonium persulfate and sodium persulfate.

12. The method for preparing the thinning ceramic additive using the landfill leachate according to claim 2 , wherein the additive is formed by mixing more than one of sodium silicate, sodium tripolyphosphate, sodium metasilicate pentahydrate, sodium carbonate and sodium hexametaphosphate.

Assignees

• Univ Fuzhou
• Fujian Boyi Environmental Protection Tech Co Ltd

Inventors

• Liu Minghua
• Zhang Yuqing
• Liu Yifan
• Lv Yuancai
• Li Xiaoquan

Classifications

• C04B24/2652 Primary

  Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles · CPC title

• C04B24/2641

  Polyacrylates; Polymethacrylates · CPC title

• C04B20/023

  Chemical treatment · CPC title

• C08F289/00

  Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds not provided for in groups C08F251/00 - C08F287/00 · CPC title

• C04B35/63444 Primary

  Nitrogen-containing polymers, e.g. polyacrylamides, polyacrylonitriles, polyvinylpyrrolidone [PVP], polyethylenimine [PEI] · CPC title