Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method of using crop straw to produce acidic wastewater adsorbent for mine

A technology for crop stalks and acidic wastewater, applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve problems such as secondary pollution, high operating costs, and low pH

Inactive Publication Date: 2012-07-25
XIAN UNIV OF SCI & TECH
View PDF2 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Commonly used SOs 4 2- Removal technologies such as barium salt and calcium salt precipitation method, freezing method, mainly for SO in industrial water 4 2- Removal, these methods are not suitable due to the large amount of AMD water and low pH
Moreover, the chemical dosing and precipitation method has high operating costs, which may cause secondary pollution or require post-treatment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of using crop straw to produce acidic wastewater adsorbent for mine
  • Method of using crop straw to produce acidic wastewater adsorbent for mine
  • Method of using crop straw to produce acidic wastewater adsorbent for mine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with specific embodiments.

[0023] After the agricultural straw material is treated with NaOH solution, part of the lignin and a small amount of hemicellulose can be removed, and the cellulose can form sodium cellulose and alkali fiber, and its chemical reactivity is higher than that of the original natural cellulose. The cross-linking reaction of cellulose, alkali fiber and epichlorohydrin is usually carried out under alkaline conditions, which is a heterogeneous reaction with a slow reaction rate and is affected by the low solubility of epichlorohydrin in water. Before the joint reaction, the water in the alkalized straw is removed by pressing, and epichlorohydrin is used as the reaction reagent and solvent. The cross-linking reaction product is subjected to quaternization reaction with trimethylamine alcohol solution to prepare strong basic anion exchanger. The N element in the quaternary ammoni...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method of using crop straws to produce an acidic wastewater adsorbent for a mine, which comprises the following steps of: A1, cleaning, drying and crushing the crop straws to 20-40 meshes; A2, alkalizing straw particles after crushing; A3, dehydrating the straws after alkalization; A4, mixing dehydrated and alkalized straws with excessive epichlorohydrin for crosslinking reaction; A5, mixing solid products prepared in the crosslinking reaction and trimethylamine alcoholic solution for quaternization reaction to prepare a solid-phase product; and A6, cleaning the solid-phase product, and drying to obtain the adsorbent. Compared with the traditional sulfate removal method, sulfate radical can be effectively removed, no secondary pollution can be caused, and no post-processing equipment is needed. The used adsorbent can be recycled after regeneration in NaOH solution, and the removal rate of SO4<2-> remains more than 75 percent after the adsorbent is recycled multiple times.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to an adsorbent for making acidic wastewater by using crop straws, especially for the treatment of mine wastewater. Background technique [0002] According to statistics, the discharge of various types of mine wastewater in my country is about 2.5 billion m3 per year. 3 , accounting for about 10% of the national industrial wastewater discharge. Among them, acid mine wastewater (AMD) contains a large amount of soluble toxic metal ions and SO 4 2- , has become one of the most serious environmental problems in the mining process. The source of AMD is generally considered to be that in the mining process of coal mines and various metal ores, sulfide-containing ores are exposed to the air and oxidized, and gradually form a large amount of H after being washed by rainwater and mineral processing water. + , SO 4 2- and some toxic metal elements in the wastewater. This wastewa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J20/24B01J20/30C02F1/28
Inventor 赵晓光贾锐鱼金大瑞
Owner XIAN UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com