Cement grinding aids prepared with waste antifreeze

Patent metadata

Field	Value
Publication number	US-10077211-B2
Application number	US-201515301240-A
Country	US
Kind code	B2
Filing date	Sep 29, 2015
Priority date	May 20, 2015
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

It discloses cement grinding aids prepared with waste antifreeze which comprises the following components in parts by weight: 20-75 parts of pretreated waste antifreeze, 5-40 parts of alkanolamine, 1-5 parts of acid solution, 3-12 parts of saccharide and 15-50 parts of water. The pretreated waste antifreeze is prepared by adding an alkaline solution into waste antifreeze to regulate the pH value, adding a flocculant, and stirring and standing; separating upper-layer oil, and then filtering to remove flocculent precipitates, thus obtaining a clear mixed solution.

First claim

What is claimed is:

1. A cement grinding aid prepared with waste antifreeze, comprising the following components in parts by weight:

pretreated waste antifreeze
20-75
parts,

alkanolamine
5-40
parts,

acid solution
1-5
parts,

saccharide
3-12
parts,

water
15-50
parts.

2. The cement grinding aid of claim 1 , comprising the following components in parts by weight:

pretreated waste antifreeze
25-55
parts,

alkanolamine
5-35
parts,

acid solution
1-5
parts,

saccharide
5-10
parts,

water
20-40
parts.

3. The cement grinding aid of claim 1 , wherein the pretreated waste antifreeze is prepared by the following method: adding an alkaline solution into waste antifreeze to regulate pH value to 8-12, adding a flocculant, and stirring and standing; separating upper-layer oil, and then filtering to remove flocculent precipitates, thus obtaining a clear mixed solution.

4. The cement grinding aid of claim 3 , wherein the alkaline solution is an aqueous solution of any of NaOH, KOH, triethanolamine, triisopropanolamine, diethanolisopropanolamine, N,N,N′,N′-tetra(2-ethoxy)ethylenediamine and ethanoldiisopropanolamine, and the mass concentration of solute is within the range of 20-99%.

5. The cement grinding aid of claim 3 , wherein the flocculant is one compound or more compounds selected from a group consisting of aluminum sulfate, polyaluminum sulfate and polyacrylamide.

6. The cement grinding aid of claim 3 , wherein the mass ratio of the flocculant to the pretreated waste antifreeze is (0.01-0.03): 1.

7. The cement grinding aid of claim 3 , wherein standing time is 2-8 hours.

8. The cement grinding aid of claim 1 , wherein the alkanolamine is any one of or a mixture of several of diethanolisopropanolamine, N,N,N′,N′-tetra(2-ethoxy)ethylenediamine and N-methyldiethanolamine.

9. The cement grinding aid of claim 1 , wherein the acid solution is an aqueous solution of any one of acetic acid, sulfuric acid, hydrochloric acid and phosphoric acid, wherein the mass concentration of solute is 30-99%.

10. The cement grinding aid of claim 1 , wherein the saccharide is at least one of or a mixture of several of molasses, corn syrup, glucose, saccharose and gluconic acid as well as salts of the glucose, saccharose or gluconic acid.

Assignees

• Nanjing University Of Technology

Inventors

• Li Weifeng
• Ma Suhua
• Shen Xiaodong

Classifications

• C04B22/165

  Acids · CPC title

• C04B22/141

  Acids · CPC title

• C04B24/04

  Carboxylic acids; Salts, anhydrides or esters thereof · CPC title

• C04B22/002

  Water · CPC title

• C04B24/10

  Carbohydrates or derivatives thereof · CPC title