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A new process for directly producing polyaluminum chloride from bauxite

A technology of polyaluminum chloride and bauxite, which is applied in the chemical industry, can solve the problems of low dissolution rate of light burning material and hydrochloric acid reaction, limit the supply of polyaluminum chloride raw materials, increase labor intensity, etc., to reduce energy consumption costs, The effect of reducing labor intensity and saving resources

Active Publication Date: 2015-08-26
HENGYANG JIANHENG IND DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the raw material is lightly burned, bauxite must be calcined at a high temperature of 800 ° C in a rotary kiln, which not only wastes energy, but also pollutes the environment, and increases unnecessary labor intensity, which limits the raw material supply of polyaluminum chloride (raw material height Dependence), and the dissolution rate of light burning material reacting with hydrochloric acid is low (only about 90%)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A new process for directly producing polyaluminum chloride with bauxite, the process steps are as follows: put 0.8 tons of water in 5M 3 In the pressure-resistant and acid-resistant reaction pot, 1.2 tons of alumina content Al 2 o 3 ≥37wt.%, 60 mesh 80% bauxite powder sieved into the reaction pot, start stirring, stirring speed 60 rpm, then add 2.4M 3 30% hydrochloric acid, seal the pressure and inject steam to start the reaction, raise the temperature to 120°C, increase the pressure to 0.40MPa, keep the reaction for 4.5 hours until the reaction is complete, then release the pressure, put the reaction solution into the underground pool, add 0.6 tons of calcium aluminate powder, Adjust the basicity to 70% and react for 2 hours, then separate the residue liquid through plate and frame filtration, and pass the filtrate through drum or spray drying to obtain solid polyaluminum chloride products.

Embodiment 2

[0017] A new process for directly producing polyaluminum chloride with bauxite, the process steps are as follows: put 0.8 tons of water in 5M 3 In the pressure-resistant and acid-resistant reaction pot, 1.2 tons of alumina content Al 2 o 3 ≥37wt.%, 60 mesh 80% bauxite powder sieved into the reaction pot, start stirring, stirring speed 60 rpm, then add 2.4M 3 30% hydrochloric acid, seal the pressure and feed steam to start the reaction, raise the temperature to 110°C, increase the pressure to 0.30MPa, keep the reaction for 4 hours until the reaction is complete, then release the pressure, put the reaction solution into the underground pool, add 0.46 tons of calcium aluminate powder, Adjust the basicity to 50% and react for 1.5 hours, then separate the residue liquid through plate and frame filtration, and pass the filtrate through a drum or spray drying to obtain a solid polyaluminum chloride product.

Embodiment 3

[0019] A new process for directly producing polyaluminum chloride with bauxite, the process steps are as follows: put 0.8 tons of water in 5M 3 In the pressure-resistant and acid-resistant reaction pot, 1.2 tons of alumina content Al 2 o 3 ≥37wt.%, 60 mesh 80% bauxite powder sieved into the reaction pot, start stirring, stirring speed 60 rpm, then add 2.4M 3 30% hydrochloric acid, seal the pressure and inject steam to start the reaction, raise the temperature to 130°C, increase the pressure to 0.50MPa, keep the reaction for 5 hours until the reaction is complete, then release the pressure, put the reaction solution into the underground pool, add 1.2 tons of calcium aluminate powder, Adjust the basicity to 95% and react for 2.5 hours, then separate the residue liquid through plate and frame filtration, and pass the filtrate through drum or spray drying to obtain solid polyaluminum chloride products.

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Abstract

The invention relates to a new process for directly producing poly aluminum chloride by using bauxite. The process comprises the following steps: carrying out a pressurized stirring reaction of bauxite and hydrochloric acid in an acid resistance and pressure resistance reactor to obtain an aluminum trichloride reaction liquid; adding the aluminum trichloride reaction liquid into an underground pool; adding calcium aluminate powder to carry out a polymerization reaction; adjusting basicity; carrying out filter pressing through a plate-and-frame filter press; and carrying out drying on the resulting filtrate through a roller or a spraying device to obtain the solid poly aluminum chloride product. According to the present invention, the pressurized reaction of the bauxite is directly adopted, and the calcined bauxite is not used, such that energy source is substantially saved, energy consumption cost is reduced, a technology process is shortened, labor intensity is reduced, and the poly aluminum chloride reaction is not limited by the ore source; with the pressurized reaction, a dissolution rate of the bauxite is more than 95%, and is much higher than a dissolution rate of 90% of the calcined bauxite, such that the resources are efficiently used, and are saved, generation amount of the unit product bauxite residue is reduced, and influence on the environment is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a new process for directly producing polyaluminum chloride from bauxite. Background technique [0002] Polyaluminum chloride, referred to as polyaluminum, English name PAC, is a cationic inorganic polymer flocculant of polyhydroxyl and multinuclear complexes. The solid product is yellow or white solid powder, and is easily soluble in water. Strong bridging adsorption, in the process of hydrolysis, accompanied by physical and chemical changes such as electrochemistry, coagulation, adsorption and precipitation, and finally generate AL 2 (OH) 3 , so as to achieve the purpose of purification. [0003] At present, the production of solid polyaluminum chloride adopts the aluminum hydroxide pressurization method in China. After the bauxite is crushed and calcined at a high temperature of 800°C in a rotary kiln, it is ground into 80 mesh bauxite powder, and water is added to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/56
Inventor 何青峰何朝晖蒋发忠黄友桂
Owner HENGYANG JIANHENG IND DEV