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A system for continuous production of pseudo-boehmite and using method thereof

A pseudo-boehmite and sodium aluminate technology, which is applied in the field of continuous production of pseudo-boehmite, can solve problems such as poor product quality stability, broken decomposition towers, mixed flow of decomposition reactions, etc., to achieve stable and product quality quality, keeping the burn reduction unchanged, and purifying the site environment

Active Publication Date: 2022-08-05
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the batch method is generally used to prepare pseudo-boehmite, that is, the decomposition tower, aging tank and washing and drying device are broken, and a series continuous production mode has not been formed. The following problems exist: 1. The problem of mixed flow of decomposition reaction is serious, and impurities appear franetonite; 2. Poor product quality stability; 3. Unbalanced decomposition

Method used

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  • A system for continuous production of pseudo-boehmite and using method thereof
  • A system for continuous production of pseudo-boehmite and using method thereof
  • A system for continuous production of pseudo-boehmite and using method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0085] Prepare sodium aluminate solution 12L, alumina concentration 40g / l, ventilation speed 1.5m 3 / h, install the reaction device, use a peristaltic pump to measure the feeding rate of the sodium aluminate solution during continuous feeding, first add 1.0 L of sodium aluminate solution into the decomposition tower, measure the initial temperature of the sodium aluminate solution at 15°C, and start to open Intake valve, carry out pre-decomposition, at this moment peristaltic pump does not open, ventilation time is 12min, when pre-decomposition ends, open peristaltic pump and start to feed sodium aluminate solution, peristaltic pump feed rate 20, after 5min, the storage tank of decomposition tower The overflow port begins to overflow with slurry, enters the slurry storage tank, overflows naturally after 30 minutes, and directly enters the temperature raising tank with a pipeline, and starts to raise the temperature. After reaching the temperature, it is naturally transferred t...

Embodiment 2

[0091] Prepare sodium aluminate solution 20L, alumina concentration 50g / l, ventilation speed 2.5m 3 / h, install the reaction device, use the peristaltic pump to measure the feeding rate of the sodium aluminate solution during continuous feeding, first add 1.5L of the sodium aluminate solution into the decomposition tower, measure the initial temperature of the sodium aluminate solution, and keep the initial temperature at 30 ℃, start to open the air inlet valve, carry out pre-decomposition, now the peristaltic pump does not open, ventilation time 20min time, when the pre-decomposition ends, open the peristaltic pump and start to enter the sodium aluminate solution, the peristaltic pump feed rate 30, after 3min, decompose The overflow port of the storage tank of the tower begins to overflow with slurry. After entering the slurry storage tank for 40 minutes, the slurry overflows. It is directly passed into the temperature raising tank with a pipeline, and the temperature is raise...

Embodiment 3

[0096] Prepare sodium aluminate solution 300L, alumina concentration 40g / l, ventilation speed 2.0m 3 / h, this example was prepared and implemented according to the continuous reaction of 72 hours, the reaction device was installed, the feeding rate of the sodium aluminate solution during continuous feeding was measured with a peristaltic pump, and 1.5L of sodium aluminate solution was first added into the decomposition tower. The initial temperature of the sodium aluminate solution, the initial temperature is kept at 20 ℃, the intake valve is opened, and the pre-decomposition is carried out. At this time, the peristaltic pump is not turned on, and the ventilation time is 22 minutes. When the pre-decomposition is over, the peristaltic pump is turned on to start the sodium aluminate solution. , the feed rate of the peristaltic pump is 30 rpm, after 3 minutes, the overflow port of the storage tank of the decomposition tower begins to overflow with slurry, and after entering the sl...

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Abstract

A system for the continuous production of pseudo-boehmite and a method for using the same, the system comprises: a gas-liquid mixing kettle for homogeneous mixing of sodium aluminate solution and carbon dioxide to obtain a gas-liquid mixed liquid; a decomposition tower, It is used for the pre-reaction of sodium aluminate solution, and the decomposition reaction of the gas-liquid mixed solution to obtain slurry; the decomposition tower is connected with the gas-liquid mixing kettle; the slurry storage tank is used to store the overflow of the decomposition tower. slurry; the slurry storage tank is connected with the decomposition tower; the temperature raising tank is used to increase the temperature of the slurry; the temperature raising tank is connected with the slurry storage tank; the aging tank is used for aging The aging tank is connected with the temperature raising tank; a static washing filter press is used for solid-liquid separation of the slurry; the static washing filter press is connected with the aging tank. The pseudo-boehmite prepared by the system for continuous production of pseudo-boehmite provided by the present invention can achieve different degrees of increase in crystallinity, grain size, peptization index, pore volume and specific surface.

Description

technical field [0001] The invention belongs to the field of preparing alumina, and in particular relates to a system for continuous production of pseudo-boehmite and a method for using the same. Background technique [0002] Pseudo-boehmite, also known as monohydrate alumina, pseudo-boehmite, can be used as a binder for semi-synthetic rare earth Y-type molecular sieve cracking catalysts, a binder for aluminum silicate refractory fibers, a catalyst for alcohol dehydration to ethylene, and It can also be used as a raw material for the production of catalyst supports, activated alumina and other aluminum salts. [0003] At present, the batch method is generally used to prepare pseudo-boehmite, that is, the decomposition tower, the aging tank and the washing and drying device are broken, and the mode of serial continuous production is not formed. dawsonite; 2. Poor product quality stability; 3. Unbalanced decomposition. SUMMARY OF THE INVENTION [0004] In view of the above...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/142
CPCC01F7/142C01P2006/82C01P2006/14C01P2006/12Y02P20/141
Inventor 赵言培王少武樊慧芳周峰李广战姚毅岳巍
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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