Unlock instant, AI-driven research and patent intelligence for your innovation.

Flocculating agent preparation method for accelerating sedimentation of ultrafine tailings

A flocculant and fine tailing technology, which is applied in the field of flocculant preparation to accelerate the settlement of ultra-fine tailings, can solve the problems of slow settling speed, complicated process, and high consumption of chemicals, so as to improve the settling speed, simplify the process flow, and be widely used Effect

Inactive Publication Date: 2019-05-31
FENY
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For ultra-fine tailings, it contains a large amount of ultra-fine suspended solids inside, forming a stable electric double layer structure with water. After adding conventional flocculants, the settling speed is still very slow. If the amount of flocculants is forcibly increased, Although it will increase the settling velocity, it will lead to difficulties in the subsequent deep dehydration of tailings; even some ultra-fine tailings have similar physical and chemical properties to municipal sludge, have colloidal properties, and are very stable in water. Ordinary conventional organic flocculants are very It is difficult to change the structure of the electric double layer, resulting in ineffectiveness after adding conventional flocculants
For such ultra-fine tailings to be flocculated and settled, in order to obtain a faster settling velocity, it is first necessary to dilute the mass concentration of the tailings below 5%, then add a coagulant, and finally add more flocculant, which causes the High consumption and complex process

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
  • Flocculating agent preparation method for accelerating sedimentation of ultrafine tailings
  • Flocculating agent preparation method for accelerating sedimentation of ultrafine tailings
  • Flocculating agent preparation method for accelerating sedimentation of ultrafine tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Add hydroxyethyl cellulose and deionized water accounting for 5% of the total monomer mass into the reaction flask, heat to 40°C and stir until completely dissolved;

[0023] (2) Add ethylenediaminetetraacetic acid accounting for 1% of the total monomer mass, and add sodium persulfate and potassium bisulfite accounting for 0.1% of the total monomer mass under nitrogen protection as initiators, wherein sodium persulfate and sulfurous acid The mass ratio of hydrogen to potassium is 1:1; adjust the pH value of the reaction system to 2.5 with maleic acid, and react at a constant temperature of 40°C for 30 minutes;

[0024] (3) Control the polymerization temperature to 60°C, add acrylamide monomer to carry out the polymerization reaction, and the reaction time is 80 minutes;

[0025] (4) The reaction product was precipitated with acetone, washed with ethylene glycol and glacial acetic acid at a volume ratio of 1:1, and dried in vacuum to obtain the target product.

Embodiment 2

[0027] (1) Add hydroxyethyl cellulose and deionized water accounting for 6% of the total monomer mass into the reaction flask, heat to 45°C and stir until completely dissolved;

[0028] (2) Add ethylenediaminetetraacetic acid accounting for 1.3% of the total monomer mass, and add sodium persulfate and potassium bisulfite accounting for 0.12% of the total monomer mass under nitrogen protection as initiators, wherein sodium persulfate and sulfurous acid The mass ratio of hydrogen to potassium is 1:1.2; adjust the pH value of the reaction system to 2.6 with maleic acid, and react at a constant temperature of 45°C for 38 minutes;

[0029] (3) Control the polymerization temperature to 65°C, add acrylamide monomer to carry out the polymerization reaction, and the reaction time is 90 minutes;

[0030] (4) The target product is obtained after the reaction product is precipitated with acetone, washed with ethylene glycol, and dried in vacuum.

Embodiment 3

[0032] (1) Add hydroxyethyl cellulose and deionized water accounting for 6.5% of the total monomer mass into the reaction flask, heat to 50°C and stir until completely dissolved;

[0033] (2) Add ethylenediaminetetraacetic acid accounting for 1.5% of the total monomer mass, and add sodium persulfate and potassium bisulfite accounting for 0.15% of the total monomer mass under nitrogen protection as initiators, wherein sodium persulfate and sulfurous acid The mass ratio of hydrogen to potassium is 1:1.3; adjust the pH value of the reaction system to 2.7 with maleic acid, and react at a constant temperature of 50°C for 40 minutes;

[0034] (3) Control the polymerization temperature to 70°C, add acrylamide monomer to carry out the polymerization reaction, and the reaction time is 95 minutes;

[0035] (4) The target product was obtained after the reaction product was precipitated with acetone, washed with glacial acetic acid, and dried in vacuum.

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 flocculating agent preparation method for accelerating sedimentation of ultrafine tailings. The flocculating agent preparation method includes the steps of (1) adding hydroxyethyl cellulose and deionized water to a reaction flask, and performing heating and stirring until complete dissolution; (2) adding ethylenediaminetetraacetic acid, adding a certain amount of initiators under the protection of nitrogen, adjusting the pH value of a reaction system by maleic acid, and carrying out a constant-temperature reaction; (3) controlling the polymerization temperature, and adding acrylamide monomers for polymerization; (4) precipitating, washing and vacuum-drying reaction products to obtain target products. Flocculating agents prepared by the method can obviously accelerate the sedimentation of the ultrafine tailings, so that the consumption of the flocculating agents is reduced.

Description

technical field [0001] The invention relates to the technical field of tailings treatment, in particular to a method for preparing a flocculant for accelerating the settlement of ultrafine tailings. Background technique [0002] Dehydration is an essential link in the process of tailings treatment. Generally speaking, pressure filtration and concentration are the main methods of tailings dehydration. Concentration is favored due to its large processing capacity and low energy consumption. The tailings need to add flocculants in the thickener thickener process to achieve efficient solid-liquid separation. This is because the flocculants can effectively accelerate the free settling speed of the tailings to remove solid suspended particles in the overflow water, so it is widely used in tailings dehydration In the field, the flocculation effect of tailings is related to the cost of chemicals in the solid-liquid separation process, the utilization of backwater, and green discharg...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/56B01D21/01
Inventor 曹兴
Owner FENY