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Efficient polyaluminium chloride and preparation technology thereof

A technology for polyaluminum chloride and preparation process, applied in the directions of aluminum chloride, aluminum halide, chemical instruments and methods, etc., can solve the problems of poor acid solubility of aluminum hydroxide, waste of aluminum hydroxide raw materials, insufficient utilization of raw materials, etc. , to achieve the effect of reasonable allocation of raw materials, reduction of waste, and simple process flow

Inactive Publication Date: 2018-06-22
青岛元汇丰企业管理咨询服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of poor acid solubility of aluminum hydroxide in the prior art, serious waste of aluminum hydroxide raw materials, insufficient utilization of raw materials, etc., the present invention provides a high-efficiency polyaluminum chloride and its preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A high-efficiency polyaluminum chloride and its preparation process, using aluminum hydroxide and hydrochloric acid as raw materials, comprising the following steps:

[0022] Step 1: Add 750 parts of hydrochloric acid and 105 parts of aluminum hydroxide with a purity of 95% in sequence in an acid and alkali-resistant reactor. The aluminum hydroxide is added evenly while stirring, and then heated and pressurized; The conditions of heating and pressurizing reaction are: temperature 50°C, pressure 5 atmospheres, reaction time 4h;

[0023] Step 2: After the reaction described in Step 1 is completed, add an appropriate amount of aluminum chips and sodium aluminate, and keep the temperature at 60°C for 12 hours to adjust the basicity to 73%;

[0024] In step 3, the liquid obtained in step 2 is filtered by a plate and frame filter press device, and the filter residue obtained by the filter press is put back into the acid and alkali-resistant reactor in step 1 for reuse, and th...

Embodiment 2

[0029] A high-efficiency polyaluminum chloride and its preparation process, using aluminum hydroxide and hydrochloric acid as raw materials, comprising the following steps:

[0030] Step 1: Add 760 parts of hydrochloric acid and 102 parts of aluminum hydroxide with a purity of 98% in sequence in an acid and alkali-resistant reactor. The aluminum hydroxide is added evenly while stirring, and then heated and pressurized; The conditions of heating and pressurizing reaction are: temperature 60°C, pressure 3 atmospheres, reaction time 5h;

[0031] Step 2: After the reaction described in Step 1 is completed, add an appropriate amount of aluminum chips and sodium aluminate, and keep the temperature at 70°C for 11 hours to adjust the basicity to 68%;

[0032] In step 3, the liquid obtained in step 2 is filtered by a membrane filter press device, and the filter residue obtained by the filter press is put back into the acid-resistant and alkali-resistant reactor in step 1 for reuse, and...

Embodiment 3

[0037] A high-efficiency polyaluminum chloride and its preparation process, using aluminum hydroxide and hydrochloric acid as raw materials, comprising the following steps:

[0038] Step 1: Add 780 parts of hydrochloric acid and 103 parts of aluminum hydroxide with a purity of 97% in sequence in an acid and alkali-resistant reactor, and the aluminum hydroxide is evenly added while stirring, and then heated and pressurized; The conditions of heating and pressurizing reaction are: temperature 80°C, pressure 4 atmospheres, reaction time 3.5h;

[0039] Step 2, after the reaction described in step 1 is completed, add an appropriate amount of aluminum chips and sodium aluminate, and keep the temperature at 80°C for 10 hours to adjust the basicity to 62%;

[0040] In step 3, the liquid obtained in step 2 is filtered by a plate and frame filter press device, and the filter residue obtained by the filter press is put back into the acid and alkali-resistant reactor in step 1 for reuse, ...

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Abstract

The invention discloses efficient polyaluminium chloride and a preparation technology thereof. With aluminum hydroxide and hydrochloric acid as raw materials, the preparation technology includes the steps that firstly, the raw materials are subjected to a heating and pressurizing reaction, and an appropriate amount of aluminum debris and sodium aluminate are added to regulate the basicity; then, asolution obtained after the reaction is subjected to filter pressing, filter residues obtained after filter pressing are reused, filter liquor is subjected to curing aftertreatment, and thus liquid PAC is obtained; the obtained liquid PAC is subjected to spray drying to obtain powdery PAC. The technological process is carried out according to the green chemistry principle, the raw materials are completely converted into the product polyaluminium chloride, no useless waste and corresponding raw material wasting are generated in the whole technology, and thus the technology is environmentally friendly and free of pollution and conforms to the development concept of green chemistry.

Description

technical field [0001] The invention relates to the technical field of preparation of polyaluminum chloride, in particular to a high-efficiency polyaluminum chloride and a preparation process thereof. Background technique [0002] Polyaluminum chloride, commonly known as polyaluminum chloride, referred to as polyaluminum, and its English name is PAC, is an inorganic polymer coagulant. Polyaluminum chloride is also commonly called water purifying agent or coagulant. It is a polyhydric cationic inorganic polymer flocculant. The appearance of solid product is reddish brown, yellow or white solid powder, and it is easily soluble in water. Strong bridging adsorption, accompanied by physical changes such as electrochemical, coagulation, adsorption and precipitation during the hydrolysis process, so as to achieve the purpose of purification. Among them, spray-dried polyaluminum chloride has been developed rapidly in recent years. Spray-dried polyaluminum chloride has high stabilit...

Claims

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Application Information

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IPC IPC(8): C01F7/56C02F1/52
CPCC01F7/56C02F1/5245
Inventor 薛慧王济伦
Owner 青岛元汇丰企业管理咨询服务有限公司
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