Technical process for producing chloride aluminum

A technology of polyaluminum chloride and process method, which is applied in the direction of aluminum chloride, aluminum halide, flocculation/precipitation water/sewage treatment, etc., and can solve the problems of calcium chloride suspended solids, water-insoluble substances exceeding the standard, and high production costs. Achieve the effects of shortening natural settlement time, increasing production and saving initial investment

Inactive Publication Date: 2007-09-19
王军 +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current problem is that whether calcium aluminate acid-dissolving one-step method is used or other aluminum-containing raw materials are combined with calcium aluminate mixed acid-dissolving one-step method (commonly known as one-pot cooking), there will be a large amount of calcium aluminate produced in the acid-dissolving production process. The problem that calcium chloride suspension is difficult to effectively separate from PAC solution has resulted in serious excess of water-insoluble matter in PAC finished products, which is still difficult to solve at present
However, the production cost of this process is high, and only a few manufacturers use this process for export products, which makes the promotion of this process slow

Method used

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  • Technical process for producing chloride aluminum
  • Technical process for producing chloride aluminum
  • Technical process for producing chloride aluminum

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Experimental program
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Effect test

Embodiment 1

[0034] The first step of acid dissolution reaction:

[0035] In the acid-resistant reactor equipped with stirring and acid mist recovery device, add water and hydrochloric acid in sequence to make 16-25% acid-soluble reaction solution. Start stirring and preheating to 40°C-60°C, cut off the heat source, and adjust the amount of bauxite in the formula step by step (bauxite can be boehmite ore, trihydrate bauxite, low-grade bauxite, etc.) (Based on the acid-soluble aluminum content of 30%), put all the liquid in before the liquid temperature is 90°C, and rely on self-heating reaction when the temperature rises to ≥100°C, heat again, and strengthen the reaction at normal pressure for 2-4 hours, and the reaction temperature is 105°C-115°C between. Before discharging, add acid-soluble coagulant polyacrylamide in an amount of 0.005% to 0.05% of the volume of the aluminum-containing acid solution, and stir for 1-2 minutes. Put the reaction material into the liquid slag separation t...

Embodiment 2

[0039] The first step of acid dissolution reaction:

[0040] In the acid-resistant reactor equipped with stirring and acid mist recovery device, add water and hydrochloric acid in sequence to make 16-25% acid-soluble reaction solution. Start stirring and preheating to 40°C-60°C, cut off the heat source, add the amount of kaolin in the formula (calculated as 30% acid-soluble aluminum content) in batches before the liquid temperature is 90°C, and rely on self-heating reaction to raise the temperature ≥ 100 ℃, heat again, and strengthen the reaction at normal pressure for 2-4 hours, and the reaction temperature is between 105 ℃ and 115 ℃. Before discharging, add acid-soluble coagulant polyacrylamide in an amount of 0.005% to 0.05% of the volume of the aluminum-containing acid solution, and stir for 1-2 minutes. Put the reaction material into the liquid slag separation tank, let it stand for precipitation, and the supernatant is the mother liquor of the next step polymerization r...

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Abstract

A technique for preparing polyaluminium chloride is characterized in that: the technique controls the water insoluble substances by a two-step coagulating sedimentation method and comprises the steps of: (1)generating aluminic acid solution by the reaction of aluminium-containing raw material and hydrochloric acid in an acid-proof vessel, adding acid soluble coagulant to execute coagulating sedimentation, and then picking up the supernatant as mother liquor; (2)adding water into the mother liquor obtained in step (1), and heating up in an acid-proof vessel, and then adding calcium aluminate to react in atmospheric pressure, finally adding polymerization coagulant; (3)precipitating to obtain the supernatant which is liquid PAC, obtaining solid PAC by means of drying. The present invention has the advantages of that: the two-step coagulating sedimentation method can overcome the problem of that the control and reduction of the water insoluble substances in PAC preparing process, which uses calcium aluminate as raw material, is hard, the operation is simple, the cost is lower, the settling time can be reduced at 10~20 times, the operability is better, the economic benefit is obviously and each index of the PAC product can satisfy the national standard.

Description

technical field [0001] The invention relates to water purifying agent technology, in particular to a process for producing polyaluminum chloride, which mainly uses two-step coagulation and sedimentation to control water-insoluble matter, and produces polychlorinated polychloride that meets national standards, has low cost, and is of good quality. Aluminum (PAC) water treatment agent. Background technique [0002] With the development of my country's environmental protection industry, polyaluminum chloride (PAC) has been fully used as an efficient water treatment agent in China. However, the traditional polyaluminum chloride production process adopts "pyrolysis method", "neutralization method", "gel method", "double acid method" and other processes, all of which have disadvantages such as long process flow and high production cost. The acid-dissolving one-step method of using calcium aluminate as the raw material for PAC production or the one-step method of mixing acid-disso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56C01F7/58C02F1/52
Inventor 王新德王军王耀民郭海彬何书霞王剑
Owner 王军
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