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Preparation of calcium type polyaluminium chloride purificant

A technology of polyaluminum chloride and water purifying agent, which is applied in the chemical industry, can solve the problems such as the inability to accurately calculate the dosage of the regulator, affect the quality and performance of the product, and affect the polymerization process, so as to improve the flocculation performance and stability, and is not easy to secondary The effect of pollution and cost reduction

Inactive Publication Date: 2008-10-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the dissolution process is mainly about the dissolution rate of aluminum and the pH value of the solution after dissolution. In the existing process, it is difficult to take into account these two problems at the same time: increase the amount of acid, improve the dissolution rate, and the pH value of the dissolution solution is higher, thus affecting Subsequent polymerization process
If there is a large amount of free acid in the eluate, the amount of regulator cannot be accurately calculated in the polymerization process, which will affect the quality and performance of the product

Method used

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  • Preparation of calcium type polyaluminium chloride purificant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The raw ore of kaolin was milled with a ball mill for 2 hours according to ore sample: zirconium ball: water (mass ratio) = 1:5:3, then stood for stratification, removed water, and dried in a constant temperature drying oven at 95°C. Weigh a certain amount of dried ore sample, raise it to 750°C in a muffle furnace, keep it warm for 2 hours, and then cool to obtain clinker. Weigh 45.885g of clinker, take 30.554g and put it into the reaction kettle, add 247.5mL of 15% hydrochloric acid according to the ratio of alumina to acid (1:5.57). Place the reaction kettle on a magnetic stirrer with a stirring speed of 1785r / min, raise the temperature to about 100°C and keep it warm for 2 hours, then add 15.331g (remaining clinker) clinker, and react for 1.5 hours. Stop stirring. Cool and filter, weigh the weight of the filtrate, and measure the alumina content and basicity to be 3.80% and 17.70% respectively. The eluate was placed on a magnetic stirrer with a stirring speed of 10...

Embodiment 2

[0038] In Example 1, the weighed clinker 45.885g was changed to 105.547g, 69.9824g was taken and put into the reaction kettle, and 420mL of 20% hydrochloric acid was added according to the alumina-acid ratio (1:5.64). Place the reaction kettle on a magnetic stirrer with a stirring speed of 1020r / min, raise the temperature to about 100°C and keep it warm for 2 hours, then add 35.5646g (residual clinker) clinker, and react for 1.5 hours. Stop stirring. Cool and filter, weigh the weight of the filtrate, and measure the alumina content and basicity to be 4.89% and 20.20% respectively. The eluate was placed on a magnetic stirrer with a stirring speed of 1275r / min. Weigh CaCO 3 , 56.640g was put into the eluate in batches, and the eluate was heated up at the same time. CaCO 3 After the dissolution is complete, keep warm to evaporate excess water. Afterwards, a brown liquid was obtained after cooling, and the alumina content and basicity of the product were measured to be 10.03%...

Embodiment 3

[0040]In Example 1, the weighed clinker was changed from 45.885g to 105.423g, 69.755g was put into the reaction kettle, and 610mL of 15% hydrochloric acid was added according to the alumina-acid ratio (1:6). Place the reaction kettle on a magnetic stirrer with a stirring speed of 1020r / min, raise the temperature to about 100°C and keep it warm for 2 hours, then add 35.670g (residual clinker) clinker, and react for 1.5 hours. Stop stirring. After cooling and filtering, the weight of the filtrate was weighed, and the alumina content and basicity were measured to be 5.29% and 12.04% respectively. The eluate was placed on a magnetic stirrer with a stirring speed of 2300r / min (fast). Weigh CaCO 3 , 65.864g was put into the eluate in batches, and the eluate was heated up at the same time. CaCO 3 After the dissolution is complete, keep warm to evaporate excess water. Afterwards, a pale yellow liquid was obtained after cooling, and the alumina content and basicity of the product ...

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Abstract

The invention relates to a method for the production of a calcium type polyaluminium chloride water purifying agent, which is mainly characterized in that: a kaolin is firstly activated through methods of mechanical grinding and roasting so as to make a clinker, an aluminum in the clinker is soaked out by adopting the new dissolving method of , thereby obtaining the semi-finished digestion liquor and the filter residue with rather high basicity, and the basicity of the digestion liquor is adjusted by adopting a calcium compound as a regulator to prepare the calcium type polyaluminium chloride water purifying agent. Using the water purifying agent to treat the waste water has the advantage of short flocculation response time (30s), and the sedimentation time is only 20min.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to functional materials for water treatment, in particular to a method for preparing polyaluminum chloride by utilizing kaolin. Background technique [0002] Polyaluminum Chloride (Polyaluminium Chloride) is referred to as PAC. Usually also known as basic aluminum chloride or coagulant, etc., it is between AlCl 3 and Al(OH) 3 A water-soluble inorganic high molecular polymer, the general chemical formula is [Al 2 (OH) n Cl 6-n ] m , where 1≤n≤5, m≤10. PAC has strong bridging and adsorption properties. During the hydrolysis process, physical and chemical processes such as coagulation, adsorption and precipitation occur. Therefore, it is the most widely used inorganic polymer flocculant in the field of water treatment coagulation technology. The fundamental difference between polyaluminum chloride and traditional inorganic coagulants is that traditional inorganic coagula...

Claims

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Application Information

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IPC IPC(8): C01F7/56C02F1/52
Inventor 杨华明唐爱东李传常
Owner CENT SOUTH UNIV
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