Method for producing fulvic acid by catalyzing hydrogen peroxide to degrade low-rank coal by using transition metal ions

Abstract

The invention discloses a method for producing fulvic acid by catalyzing hydrogen peroxide to degrade low-rank coal by using transition metal ions. The method comprises the following steps: firstly, crushing low-rank coal with humic acid, performing material feeding, adding water, meanwhile adding a transition metal salt or a transition metal ionic solution as a catalyst, performing uniform stirring, and adjusting the pH value of the material; further putting hydrogen peroxide into a container in different batches, performing a stirring temperature-keeping reaction, diluting the material afterthe reaction is completed, performing spinning liquid separation when the material is hot, removing precipitate, and retaining a separation liquid; adjusting the pH value of the separation liquid to1.0-1.5; and performing filter pressing and centrifugal separation, so as to obtain a fulvic acid liquid product of a small salt content. The hydrogen peroxide is activated by using transition metal ions, a free hydroxyl radical with high activation activity is generated, the low-rank coal is degraded to generate fulvic acid, sources of mineral source fulvic acid can be greatly widened, the methodis simple in process, short in production cycle, easy to control, low in consumption, small in pollution and applicable to industrial production, and the fulvic acid conversion rate is up to 90% or greater.

Description

technical field [0001] The invention belongs to the technical field of coal chemical processing and utilization, in particular to a method for producing fulvic acid by utilizing low-rank coal. Background technique [0002] Fulvic acid, also known as fulvic acid (FA), is a water-soluble component of humic acid (HA), which has special properties and use value because of its small molecular weight. At present, FA has a wide range of uses in industry, agriculture, medicine and animal husbandry. Industry: Mainly used for heavy metal and organic sewage treatment; Agriculture: Improve soil quality, promote plant growth, resist drought and disease, and at the same time can repair soil polluted by heavy metals and organic matter, and improve the efficiency of fertilizer use; Medical: Medicinal FA can stop bleeding , anti-tumor effect, also has significant curative effect on burns and scalds, and can also be made into biologically active immunomodulators; animal husbandry: adding FA ...

AI Technical Summary

Problems solved by technology

Although these four methods are more advanced than the simple hydrogen peroxide method and the nitric acid-hydrogen peroxide oxidation method, they also have the following disadvantages in summary: 1. The fineness of coal powder is relatively high (300 mesh to 600 mesh), For this reason, more equipment investment and greater energy consumption are required; 2. In order to avoid the oxidation of FA, inert gas protection is required, and the process difficulty increases; 3. The requirements for raw coal are also strict, and only lignite with high HA content ; 4. Most catalysts are expensive; 5. Formic acid and glacial acetic acid are flammable and explosive products, which increase production safety risks; 6. FA yields are generally low