Preparation method of red mud sinking agent

A settling agent, red mud technology, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of poor resistance to high temperature and high alkali, poor use effect, organic solvent pollution, etc. The effect of low cost and high degree of hydrolysis

Active Publication Date: 2010-06-16
安徽省天润功能高分子工程研究有限公司
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No matter which one of the above is used as a red mud sedimentation agent, there are major disadvantages. Due to the low degree of hydrolysis and poor resistance to high temperature and high alkali, partially hydrolyzed polyacrylamide is easily degraded when used as a red mud sedimentation agent, making the added The amount is large; sodium polyacry

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example 1:

[0018] a, at 5m 3 Add 2500 kilograms of deionized water, 210 kilograms of acrylamide, 630 kilograms of acrylic acid, and 70 kilograms of urea into the batching kettle. Turn on the stirring and mix, while cooling the temperature to 0°C with chilled brine, and add sodium hydroxide to adjust the pH to 6.5 to complete the batching;

[0019] b. Transfer the prepared materials into the reaction kettle, add 100 grams (119ppm) of disodium ethylenediaminetetraacetic acid, 150 grams (178ppm) of chain transfer agent-sodium formate, and blow nitrogen for 5 minutes (nitrogen pressure is 0.3~ 0.5Mpa) Add 1500 grams (1786ppm) of azobisisobutyronitrile as the third-stage oxidant, continue to bubbling nitrogen for 10 minutes, add 100g (119ppm) of the second-stage oxidant-azoisobutamidine hydrochloride, and continue to bubbling nitrogen for 20 minutes. Add a section of oxidizer-20 grams of ammonium persulfate (24ppm), continue nitrogen flow for 5 minutes, add 60 grams of sodium b...

Example Embodiment

[0022] Example 2:

[0023] a, at 5m 3 Add 2400 kilograms of desalinated water, 180 kilograms of acrylamide, 700 kilograms of acrylic acid, and 80 kilograms of urea to the batching kettle. Turn on the stirring and mix, while cooling the temperature to 0°C with chilled salt water, and add potassium hydroxide to adjust the pH to 7.5 to complete the batching.

[0024] b. Transfer the prepared materials into the reaction kettle, add 200 grams (227ppm) of disodium ethylenediaminetetraacetic acid, 250 grams (284ppm) of chain transfer agent-sodium acetate, and let nitrogen gas for 5 minutes (nitrogen pressure is 0.3 ~0.5Mpa) Add 1200g (1364ppm) of azobisisobutyronitrile as the three-stage oxidant, continue to blow nitrogen for 10 minutes, add 160g (182ppm) of the second oxidant-azoisobutyramidine hydrochloride, and continue to blow nitrogen for 20 minutes , Add a section of oxidant-28 grams of potassium persulfate (32ppm), continue nitrogen flow for 5 minutes, add 80 grams of reducing agen...

Example Embodiment

[0027] Example 3:

[0028] a, at 5m 3 Add 2100 kg of desalinated water, 90 kg of acrylamide, 800 kg of acrylic acid, and 80 kg of urea to the batching kettle, turn on the stirring and mix, while cooling with frozen brine to 0°C, add sodium hydroxide to adjust the pH to 8 to complete the batching.

[0029] b. Transfer the prepared materials into the reaction kettle, add 200 grams (225ppm) of disodium ethylenediaminetetraacetate and 300 grams (337ppm) of chain transfer agent-sodium hypophosphite, and blow nitrogen for 5 minutes (nitrogen pressure is 0.3~0.5Mpa) Add 1350g (1517ppm) of azobisisobutyronitrile as the three-stage oxidant, continue to blow nitrogen for 10 minutes, add 175g (197ppm) of azoisobutyramidine hydrochloride as the second-stage oxidant, and continue nitrogen 20 Add 30 grams (34ppm) of oxidizing agent-dibenzoyl peroxide for a period of minutes, continue nitrogen flow for 5 minutes, add 88 grams (99ppm) of reducing agent-sodium bisulfite, and add auxiliary reducing ...

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 relates to a preparation method of a red mud sinking agent, which comprises the following steps of mixing acrylamide, acrylic acid and urea with deionized water in weight percent, cooling and regulating the pH value to end the material preparation; mixing the ingredients, chelating agent and chain transfer agent in a reaction kettle, sequentially adding a third section oxidant, a second section oxidant, a first section oxidant, a reducer and an auxiliary reducer in nitrogen introducing process, continuously introducing nitrogen, and than stopping nitrogen introduction, sealing, and carrying out insulation polymerization reaction; opening a reaction kettle bottom valve after being placed, pressing out a rubber block by compressed air and disintegrating the rubber block into colloidal particles by a granulator; and hydrolyzing the colloidal particles, and preparing a product through treatments of granulation, drying, crushing, screening and packaging. The aluminum oxide plant red mud sinking agent has the advantages of high molecular weight, fast dissolving speed, high hydrolysis degree and low cost.

Description

technical field [0001] The invention relates to a preparation method of a red mud sedimentation agent, which belongs to the field of water-soluble polymer synthesis. Background technique [0002] In the process of converting alumina in bauxite in alumina plant into soluble aluminate, a large amount of slurry and slag liquid mixture formed by aluminate solution and red mud will be formed. Production requires that aluminate and red mud must be quickly Separation to reduce the loss of alumina and alkali, while obtaining relatively pure aluminate solution. At present, this process mostly uses settling tanks and filters to separate red mud and slurry. In order to speed up the settling speed of the red mud in the settling tank and increase the production capacity of the settling tank, a settling agent should be added to speed up the settling speed. The precipitating agents used in the past mainly include pure sodium polyacrylate, polyacrylamide, emulsion polyacrylamide, flour pa...

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): C08F220/06C08F220/56C08F8/12C08F4/40C08F4/04C02F11/14
Inventor 王林李昌龙李士国郑燕吴延粉
Owner 安徽省天润功能高分子工程研究有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap