Preparation process for high-white aluminum hydroxide

A technology of aluminum hydroxide and preparation process, which is applied in the purification of alumina/aluminum hydroxide, aluminate/aluminum oxide/aluminum hydroxide, etc., can solve the problem that the quality of aluminum hydroxide is not particularly ideal, the energy consumption is large, and the production is economical. Low efficiency and other problems, to achieve the effect of being conducive to microwave drying, low drying power consumption, and fast drying speed

Active Publication Date: 2012-01-18
GUIYANG AL-MG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the unreasonable combination of equipment and parameters in the current process, the quality of the obtained aluminum hydroxide is not particularly ideal, and the energy consumption is large, and the production economic benefit is low.

Method used

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  • Preparation process for high-white aluminum hydroxide
  • Preparation process for high-white aluminum hydroxide

Examples

Experimental program
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Effect test

Embodiment Construction

[0033] Embodiment of the present invention: Taking the production capacity of high-white aluminum hydroxide as 50kt / a as an example, the following equipment is used: ①Plate heat exchanger: select 108m 2 2 units, 27m 2 2 units;

[0034] ②Seed tank: 6 sets of flat-bottomed mechanical agitation and decomposition tanks, the specification is V 有效 =1000m 3 / tower;

[0035] ③Classification and separation settling tank: 3 sets, optional 8, 10m:

[0036] ④Horizontal belt vacuum filter: 2 sets, choose 18m 2 Filter, capacity 4.2t / set·hour;

[0037] ⑤One-level double-shaft paddle dryer: 2 sets, choose 41m 2 Dryer, capacity 4t / set·hour;

[0038] ⑥Secondary microwave dryer: 2 sets, the drying moisture is 159kg / h;

[0039] ⑦ High white aluminum hydroxide storage bin: 2 bins, choose

[0040] ⑧Packaging machine: 2 sets of 40~50kg packing machines, 2 sets of 1t packing machines.

[0041] The above equipment is connected in sequence according to the following process, and the pro...

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Abstract

The invention discloses a preparation process for high-white aluminum hydroxide. The process performs seed decomposition technology at low temperature and constant temperature; decomposed slurry is subjected to particle size grading by adopting a hydraulic cyclone and a settling tank; bottom flow of the primary settling tank and a secondary settling tank are a product; and the product is separated by a horizontal belt vacuum filter and is subjected to four-time washing to meet the adherent alkali of the product. The high-white aluminum hydroxide with attached water of less than 0.1 percent isobtained by adopting secondary drying. The preparation process adopts reasonable technical process and reasonable process parameter, thereby improving the product quality of the high-white aluminum hydroxide, and realizing large scale production; and the productivity reaches 50 kt / a or more than 50 kt / a.

Description

technical field [0001] The invention relates to a preparation process of high-white aluminum hydroxide, which belongs to the technical field of aluminum hydroxide preparation. Background technique [0002] High-white aluminum hydroxide has extremely low iron content and high whiteness, and is known as "Chinese white" by Chinese and foreign users. This aluminum hydroxide has unique optical properties (refractive index 1.57), and its uses: 1. Used as a solid surface material ( Artificial marble) filler, low viscosity when filled in resin, fast curing speed at room temperature; 2. Used as flame retardant for polyvinyl chloride, epoxy resin, polyester resin, polyurethane resin, polyvinyl chloride resin, electrical appliances and other products It is an additive filler, which has the characteristics of flame retardancy, smoke elimination, modification, and non-toxicity. After surface treatment, the flame retardancy and smoke elimination effect are better; 3. It is used as the bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01F7/46
Inventor 王贵新刘莉娜
Owner GUIYANG AL-MG DESIGN & RES INST
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