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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 12780754 B1

PDFFull Text
Date of Patent:
Nov. 03, 2026

Filed:

Dec. 16, 2025

Production method for preparing potassium humate fertilizer from potassium feldspar through continuous high-pressure hydrothermal method

Applicant:

China University of Petroleum (East China), Qingdao, CN;

Inventors:

Yuanyu Tian, Qingdao, CN;

Yiliang Tian, Qingdao, CN;

Yingyun Qiao, Qingdao, CN;

Zhaoyue Sun, Qingdao, CN;

Jingxian Wang, Qingdao, CN;

Yingshuo Wang, Qingdao, CN;

Xinjian Qiao, Qingdao, CN;

Peijie Zong, Qingdao, CN;

Yanpeng Zhang, Qingdao, CN;

Ruotong Cui, Qingdao, CN;

Assignee:

CHINA UNIVERSITY OF PETROLEUM (EAST CHINA), Qingdao, CN;

Attorney:

Calfee, Halter & Griswold LLP

Primary Examiner:

Jennifer A Smith

Int. Cl.
CPC ...
C05D 1/04 (2006.01); C05D 3/04 (2006.01); C05G 3/40 (2020.01); C05G 5/12 (2020.01); C05G 5/30 (2020.01);
U.S. Cl.
CPC ...
C05D 1/04 (2013.01); C05D 3/04 (2013.01); C05G 3/40 (2020.02); C05G 5/12 (2020.02); C05G 5/30 (2020.02);
Abstract

The disclosure relates to a method for preparing potassium humate fertilizer through continuous high-pressure hydrothermal reaction of potassium feldspar. The method comprises: wet grinding slurrying, hydrothermal reaction, flash evaporation filter pressing, humic acid modified potassium fertilizer preparation, and causticization and humic acid modified silicon-calcium fertilizer preparation. High-pressure tubular hydrothermal and tower-type delayed reactions on potassium feldspar slurry produce potassium aluminosilicate and potassium silicate. Alkaline potassium aluminosilicate filter residues are mixed with humic acid, modified, granulated, and dried to obtain humic acid coated slow-release potassium fertilizer. The alkaline potassium silicate filtrate and lime undergo causticization to obtain KOH solution, which is recycled to the wet grinding process. Alkaline calcium silicate and humic acid are mixed, modified, granulated, and dried to produce humic acid coated slow-release silicon-calcium fertilizer.

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Tian, Yuanyu. (2026). Production method for preparing potassium humate fertilizer from potassium feldspar through continuous high-pressure hydrothermal method (U.S. Patent No. 12780754). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12780754

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