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

Method for preparing calcium aluminate powder used for PAC from bauxite

A technology of calcium aluminate powder and bauxite, which is applied in the field of light metal metallurgy, and can solve the problems of large residual slag, environmental hazards, and high heavy metal content of calcium aluminate

Inactive Publication Date: 2019-08-30
GUIZHOU BRANCH CHINA ALUMINUM IND
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of water purifier PAC by acid-soluble method requires calcium aluminate powder as raw material, but the current method of producing calcium aluminate powder for PAC is to crush bauxite and limestone in proportion to form balls and send them to the rotary kiln. After calcination and cooling at 1300°C, it is crushed and packaged to produce calcium aluminate products. The main disadvantage of this method is that high alumina ore must be used as the ore, and then the high alumina ore is directly fired at high temperature, resulting in high heavy metal content in calcium aluminate. The amount of residual residue after calcium acid dissolution is large and cannot be disposed of, which brings great harm to the environment

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

Embodiment 1

[0041] A method for preparing calcium aluminate powder for PAC from bauxite, comprising the steps of:

[0042] Mix bauxite and caustic alkali solution evenly to obtain a mixed material; in the mixed material, aluminum element and OH - The molar ratio is 1: 1.3, and the concentration of the caustic solution is 100g / L;

[0043] The mixed material is removed by a dissolution reaction to obtain a dissolution slurry; the dissolution reaction temperature is 90°C, the dissolution reaction time is 10min, and the dissolution reaction pressure is 0.2Mpa;

[0044] filtering the dissolution slurry to obtain a first filter cake and a first filtrate;

[0045] Calcium carbonate is added to the stripping filtrate to carry out a synthetic reaction to obtain a synthetic slurry; in the synthetic slurry, the molar ratio of aluminum to calcium is 1:1.0; the synthetic reaction temperature is 60°C, and the Synthetic reaction time is 1h;

[0046] The synthetic slurry is filtered to obtain a second...

Embodiment 2

[0048] A method for preparing calcium aluminate powder for PAC from bauxite, comprising the steps of:

[0049] Mix bauxite and caustic alkali solution evenly to obtain a mixed material; in the mixed material, aluminum element and OH - The molar ratio is 1: 2.0, and the concentration of the caustic solution is 300g / L;

[0050] The mixed material is removed by a dissolution reaction to obtain a dissolution slurry; the dissolution reaction temperature is 280°C, the dissolution reaction time is 120min, and the dissolution reaction pressure is 1.6Mpa;

[0051] filtering the dissolution slurry to obtain a first filter cake and a first filtrate;

[0052] Calcium carbonate and calcium hydroxide are added to the stripping filtrate to carry out a synthetic reaction to obtain a synthetic slurry; in the synthetic slurry, the molar ratio of aluminum to calcium is 1:1.5; the synthetic reaction temperature is 99 ℃, the synthesis reaction time is 3h;

[0053] The synthetic slurry is filter...

Embodiment 3

[0055] A method for preparing calcium aluminate powder for PAC from bauxite, comprising the steps of:

[0056] Mix bauxite and caustic alkali solution evenly to obtain a mixed material; in the mixed material, aluminum element and OH - The molar ratio is 1: 1.5, and the concentration of the caustic solution is 150g / L;

[0057] The mixed material is removed by a dissolution reaction to obtain a dissolution slurry; the dissolution reaction temperature is 140°C, the dissolution reaction time is 30min, and the dissolution reaction pressure is 0.3Mpa;

[0058] filtering the dissolution slurry to obtain a first filter cake and a first filtrate;

[0059] Calcium carbonate, calcium hydroxide and calcium oxide are added to the stripping filtrate to carry out a synthetic reaction to obtain a synthetic slurry; in the synthetic slurry, the molar ratio of aluminum to calcium is 1:1.2; the synthetic reaction The temperature is 75°C, and the synthesis reaction time is 1.5h;

[0060] The synt...

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 method for preparing calcium aluminate powder used for PAC from bauxite. The method comprises the following steps: uniformly mixing the bauxite and a caustic alkali solutionso as to obtain a mixed material; removing impurities from the mixed material through a dissolution reaction so as to obtain a dissolution slurry, wherein the dissolution reaction is performed at a temperature of 90 to 280 DEG C and a pressure of 0.2 to 1.6 Mpa for 10 to 120 min; filtering the dissolution slurry so as to obtain a first filter cake and a first filtrate; adding a calcium source into a dissolution filtrate, and carrying out a synthesis reaction so as to obtain a synthetic slurry; and filtering the synthetic slurry so as to obtain a second filter cake and a second filtrate, wherein the second filter cake is the calcium aluminate powder.

Description

technical field [0001] The invention belongs to the field of light metal metallurgy, and in particular relates to a method for preparing calcium aluminate powder for PAC from bauxite. Background technique [0002] Calcium aluminate powder (water purifying agent raw material), the main components are CaO, Al 2 o 3 , and Fe 2 o 3 , mainly used in the production of basic aluminum chloride and polyaluminum chloride (PAC). The preparation of water purifier PAC by acid-soluble method requires calcium aluminate powder as raw material, but the current method of producing calcium aluminate powder for PAC is to crush bauxite and limestone in proportion to form balls and send them to the rotary kiln. After calcination and cooling at 1300°C, it is crushed and packaged to produce calcium aluminate products. The main disadvantage of this method is that high alumina ore must be used as the ore, and then the high alumina ore is directly fired at high temperature, resulting in high heavy...

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): C01F7/16
CPCC01F7/164
Inventor 高建阳徐爱勤杜善国祝凤美刁克建郑霞陈玉海刘伟李颍姚毅
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com