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

Preparation technology of dry sintered alumina

A technology of alumina and dry method, which is applied in the direction of alumina preparation, alumina/aluminum hydroxide, etc., and can solve the problem of no fixed steps

Active Publication Date: 2017-01-25
魏子贺
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many existing technologies are still in the exploratory stage, and there are no fixed steps to follow

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

[0021] The production process of alumina clinker in the present embodiment comprises the following steps:

[0022] (1) Grinding step: add limestone, sodium carbonate, and urea to the bauxite, mix them in a certain proportion, and grind them into raw meal powder; wherein, the mass content of bauxite in the raw meal is 50%, and the mass content in the raw meal is 50%. The mass content of limestone is 15%, the mass content of urea in raw meal is 0.01%, and the mass content of alumina in bauxite is about 50%. The particle size is 100 mesh;

[0023] ⑵Convey the raw material obtained in step 1 to the preheater located at the end of the rotary kiln, wherein the preheater includes 2 cyclones and a calciner, the two cyclones are connected, and the calciner is connected to one of the cyclones connected;

[0024] (3) The position of the discharge port of one of the cyclones is provided with an auxiliary feed port, and the reducing agent coke powder is added through the auxiliary feed p...

Embodiment 2

[0028] Urea consumption is 0.05%, other is with embodiment 1. Alkaline solution was used to dissolve the cooled alumina clinker, the final self-powdering rate of alumina clinker was 92.5%, and the clinker dissolution rate was 92.5%.

Embodiment 3

[0030] Urea consumption is 0.1%, other is with embodiment 1. Alkaline solution was used to dissolve the cooled alumina clinker, the final self-powdering rate of alumina clinker was 92.2%, and the clinker dissolution rate was 92%.

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

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a process for preparing aluminum oxide by virtue of a dry-sintering method. The process comprises the following steps: (1) carrying out powder milling, namely, adding limestone, sodium carbonate and a nitrogen-containing compound into bauxite, mixing according to a certain ratio, and carrying out powder milling to obtain raw meal powder; and proportionally milling a mixed raw meal with a certain fineness; (2) conveying the raw meal obtained in the step (1) in a preheater located at the tail end of a rotary kiln, wherein the preheater comprises two cyclone cylinders and a decomposing furnace, two cyclone cylinders are communicated and the decomposing furnace is communicated with one of two cyclone cylinders; (3) by arranging an auxiliary material inlet at the position of a material outlet of one cyclone cylinder, adding reducing agent coke powder through the auxiliary material inlet and calcining the raw meal heated by the preheater and coke powder inside the rotary kiln; and (4) cooling the calcined product obtained in the step (3) to obtain the aluminum oxide clinker. The cooled aluminum oxide clinker is dissolved out with an alkaline solution, the self-pulverizing ratio in the aluminum oxide clinker is finally not less than 92% and the dissolution rate of the clinker is not less than 90%.

Description

technical field [0001] The invention relates to a production process of alumina clinker, in particular to a process of dry sintering alumina. Background technique [0002] CN1911806A discloses a kind of alumina self-powdering clinker and its preparation method, including fly ash, limestone, fluorite, coke, and the above-mentioned components are passed through the grinding process, calcining process, and cooling process to obtain alumina self-powdering of clinker. All the alumina self-powdering clinker passes through the 0.2mm square hole sieve, and the passing rate of the 0.08mm square hole sieve reaches more than 95%, and the dissolution rate of alumina is also significantly increased. [0003] CN101434403A discloses a novel dry-process soda-lime sintered alumina processing method, comprising the following steps: (1) raw material: bauxite crushing: attached water 0-10%, alumina content 30-60%, silicon oxide content 0% ~20%; limestone: moisture less than 5%; sodium carbona...

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 Patents(China)
IPC IPC(8): C01F7/02
CPCC01F7/38
Inventor 魏子贺
Owner 魏子贺