Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A high-purity alumina and production method technology, applied in the direction of alumina/hydroxide, etc., can solve the problems of lengthening the production cycle and increasing production costs, and achieve the effects of low cost, simple production process, and easy control of purity
Inactive Publication Date: 2013-08-14
GUIYANG YIJINGXIANG PHOTOELECTRIC TECH
View PDF4 Cites 17 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
But the production cycle is lengthene
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
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0041] The technical scheme of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments:
[0042] Please refer to figure 1 , the present invention provides a production method of high-purity alumina, comprising a high-purity alumina production system and a tail gas collection system, comprising the following steps:
[0043] S1, prepare aluminum ammonium sulfate:
[0044] First put aluminum hydroxide and 98% sulfuric acid into the reactor, and add the ammonium sulfate solution of the tail gas collection system and the sulfuric acid of the tail gas collection system into the reactor as supplementary acid and supplementary water to react together to produce aluminum sulfate and aluminum sulfate The mixed solution of ammonium; after being filtered through the filter cloth, it enters the aluminum ammonium sulfate reactor for reaction; the mixed solution is in the aluminum ammonium sulfate reactor, suppleme...
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
Login to view more
Abstract
The invention discloses a production method of high-purity aluminum oxide. The production method comprises the steps of preparing aluminum ammonium sulfate, recrystallizing the aluminum ammonium sulfate, producing high-purity aluminum oxide, collecting tail gas and regenerating ammonium sulfate, i.e., firstly preparing the aluminum ammonium sulfate from aluminum hydroxide and sulfuric acid; secondly, recrystallizing the aluminum ammonium sulfate to prepare high-purity aluminum ammonium sulfate; thirdly, implementing low-temperature dehydration and intermediate-temperature decomposition calcination to produce gamma-Al2O3; decomposing and removing all ammonia gas, sulfur trioxide and water vapour; finally, grinding the gamma-Al2O3, screening the ground gamma-Al2O3, molding and pressing the screened gamma-Al2O3 by a molding press, and sintering the gamma-Al2O3 by a high temperature furnace, thereby obtaining alpha-Al2O3. In the whole production process, the tail gas is collected effectively and the waste gas is recycled effectively. The production method of the high-purity aluminum oxide is simple in production technology, free from pollution and low in cost; and the purity of the high-purity aluminum oxide is easy to control.
Description
technical field [0001] The invention relates to a production method of alumina, in particular to a production method of high-purity alumina. Background technique [0002] High-purity alumina is white, easy to disperse, stable chemical properties, moderate high-temperature shrinkage, good sintering performance; high conversion rate, low sodium content, is the basic raw material for the production of heat-resistant, wear-resistant, corrosion-resistant products, such as high Aluminum refractory materials, high-strength ceramic products, automotive spark plugs, advanced abrasive materials and other products are of reliable quality, with high melting point, good thermal stability, high hardness, good wear resistance, high mechanical strength, good electrical insulation, and corrosion resistance. It is widely used for mirror polishing of stereotyped and unshaped refractories, refractory castable binders, wear-resistant abrasives, high-purity refractory fibers, special ceramics, el...
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
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more