Process method for preparing high-purity calcium aluminate and polyaluminum chloride

A technology of polyaluminum chloride and a process method is applied in the field of preparation of high-purity water purifying agents, can solve problems such as aluminum ash pollution, and achieve the effects of low cost, high product purity, and easy availability of raw materials

Inactive Publication Date: 2019-11-19
北京鑫磊华易达技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for harmlessly treating waste hydrochloric acid and secondary aluminum ash and preparing pure calcium aluminate and polyaluminum chloride water purifying agent, using industrial waste hydrochloric acid and secondary aluminum ash as raw materials to produce aluminate Calcium and polyaluminum chloride. This method can not only solve the pollution problems of acid waste liquid discharge and aluminum ash, but also realize the purpose of synergistic utilization of aluminum ash and industrial waste hydrochloric acid to prepare high-purity calcium aluminate and polyaluminum chloride. It has good economic and social value

Method used

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  • Process method for preparing high-purity calcium aluminate and polyaluminum chloride

Examples

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Effect test

Embodiment 1

[0024] Example 1: During the hydrolysis catalytic reaction step of the secondary aluminum ash: the liquid-solid ratio of the secondary aluminum ash to water is 7ml / g, the heating temperature is 100°C, the hydrolysis catalytic reaction time is 6h, and the acidolysis reaction of the primary solid phase In the step: the ratio of the primary solid phase to hydrochloric acid and water is 1:2:4, the reaction temperature is maintained at 60° C., and the reaction is fully stirred for 4 hours. In the secondary liquid phase polymerization step: the solid-to-liquid ratio is 20:1, and the solution Keep the pH between 2.5 and 4.5, keep heating to keep the reaction temperature at 60°C, and the aging time is 10h. In the secondary solid phase calcination step: the ratio of secondary solid phase to limestone in the ball mill is 1:2, and it must go through 2 stages After crushing, the particle size is 5-13mm, fully mixed in the ball mill and the grinding fineness reaches 200 mesh, and sent to th...

Embodiment 2

[0025] Example 2: During the hydrolysis catalytic reaction step of the secondary aluminum ash: the liquid-solid ratio of the secondary aluminum ash to water is 6ml / g, the heating temperature is 95°C, the hydrolysis catalytic reaction time is 5.5h, and the acidolysis of the primary solid phase In the reaction step: the ratio of the primary solid phase to hydrochloric acid and water is 1:2.5:4.5, the reaction temperature is maintained at 70°C, and the reaction is fully stirred for 11 hours. In the secondary liquid phase polymerization step: the solid-to-liquid ratio is 20:1, The pH of the solution is kept between 2.5 and 4.5, and the reaction temperature is maintained at 70°C by continuous heating, and the aging time is 11 hours. After grade crushing, the particle size is 5-13mm, fully mixed in the ball mill and the grinding fineness reaches 200 mesh, and sent to the rotary kiln, the kiln temperature is kept at 1100-1300°C, and calcined at high temperature for 3 hours to obtain c...

Embodiment 3

[0026] Example 3: During the hydrolysis catalytic reaction step of the secondary aluminum ash: the liquid-solid ratio of the secondary aluminum ash to water is 3ml / g, the heating temperature is 80°C, the hydrolysis catalytic reaction time is 4h, and the acidolysis reaction of the primary solid phase In the step: the ratio of the primary solid phase to hydrochloric acid and water is 1:3:5, the reaction temperature is maintained at 100° C., and the reaction is fully stirred for 12 hours. In the secondary liquid phase polymerization step: the solid-to-liquid ratio is 20:1, and the solution Keep the pH between 2.5 and 4.5, keep heating to keep the reaction temperature at 100°C, and the slaking time is 12 hours. In the secondary solid phase calcination step: the ratio of secondary solid phase to limestone in the ball mill is 7:13, and it must go through 2 stages After crushing, the particle size is 5-13mm, fully mixed in the ball mill and the grinding fineness reaches 200 mesh, and ...

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Abstract

The invention discloses a process method for preparing high-purity calcium aluminate and polyaluminum chloride. The method comprises the following steps: allowing secondary aluminum ash to undergo a hydrolysis catalytic reaction, carrying out solid-liquid separation through a bag type vacuum filter press so as to obtain a primary liquid phase and a primary solid phase, allowing the primary liquidphase to be precipitated through saturated lime water so as to generate calcium fluoride, wherein pure water can be used for the hydrolysis catalytic reaction of the aluminum ash, then allowing the primary solid phase to undergo acidolysis through industrial waste hydrochloric acid, carrying out filtering through a filter press so as to obtain a secondary liquid phase and a secondary solid phase,allowing the secondary liquid phase to undergo a polymerization reaction so as to generate the polyaluminum chloride, carrying out pressure filtration and spray drying with a spray tower so as to prepare solid powdery polyaluminum chloride, completely grinding the secondary solid phase and limestone through a ball mill, sending ground secondary solid phase and ground limestone into a rotary kiln,and carrying out high-temperature calcination so as to obtain the calcium aluminate. The method provided by the invention has the characteristics of low cost, easily-available raw materials, simple production process, high product purity, no secondary pollutants, significant social benefits and economic benefits, etc.

Description

technical field [0001] The invention relates to a preparation method of a high-purity water purifying agent, in particular to a method for harmlessly treating waste hydrochloric acid and secondary aluminum ash two types of hazardous waste and producing a polyaluminum chloride flocculant. Background technique [0002] Aluminum ash is the product of the slag produced in the electrolytic aluminum production process after cooling. Generally, about 50kg of aluminum ash is produced per 1 ton of aluminum produced. Aluminum ash is included in the National List of Hazardous Wastes as aluminum smelting slag. It belongs to non-ferrous metal smelting waste (HW48). The waste codes are 321-023-48 and 321-025-48. The hazardous characteristic is toxic (T). The state has issued relevant policies to strictly prohibit illegal discharge and transfer. According to different processes, aluminum ash can be divided into primary aluminum ash (after refining) and secondary aluminum ash (after alumin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/16C01F7/56C02F1/52
CPCC01F7/164C01F7/56C02F1/5245
Inventor 不公告发明人
Owner 北京鑫磊华易达技术有限公司
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