Method for preparing aluminum polychloride from gasification slag

A technology of polyaluminum chloride and gasification slag, which is applied to aluminum chloride, aluminum halide and other directions, can solve the problems of large addition amount of aluminum source, low economic and environmental benefits, difficult alumina dissolution process, etc., and achieves low production cost. , The effect of low impurity content and high operating flexibility

Inactive Publication Date: 2018-07-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned processes generally have problems such as difficult alumina dissolution process, large amount of aluminum source added, etc., and low economic and environmental benefits

Method used

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  • Method for preparing aluminum polychloride from gasification slag

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Embodiment 1

[0050] A method for preparing polyaluminum chloride by utilizing gasification slag, comprising the steps of:

[0051] Dissolution process: Gasification slag and industrial by-product hydrochloric acid are used for mixed reaction according to the liquid-solid ratio of 4:1. The concentration of hydrochloric acid is 200g / L, the reaction temperature is 95°C, the reaction time is 120min, and the rotation speed is 350r / min; the reaction is over Afterwards, obtain filtrate through solid-liquid separation;

[0052] Circulation process: add fresh industrial by-product hydrochloric acid (30% by mass) to the above filtrate to prepare the required volume (reaching a liquid-solid ratio of 4:1 during leaching), carry out the above acid leaching process, repeat the above process, and cycle 6 times, filter to obtain aluminum-rich solution, wherein the alumina content (mass percentage composition) is as high as 8.3%;

[0053] Polymerization control: add high-calcium fluidized bed fly ash (mas...

Embodiment 2

[0056] A method for preparing polyaluminum chloride by utilizing gasification slag, comprising the steps of:

[0057] Dissolution process: Gasification slag and industrial by-product hydrochloric acid are used for mixed reaction according to the liquid-solid ratio of 6:1, the concentration of hydrochloric acid is 220g / L, the reaction temperature is 85°C, the reaction time is 180min, and the rotation speed is 350r / min; the reaction is over Afterwards, obtain filtrate through solid-liquid separation;

[0058] Circulation process: add fresh industrial by-product hydrochloric acid (30% by mass) to the above-mentioned filtrate to prepare the required volume (reaching a liquid-solid ratio of 6:1 during leaching), carry out the above acid leaching process, repeat the above process, and cycle 7 times, filter to obtain aluminum-rich solution, wherein the alumina content (mass percentage composition) is as high as 7.8%;

[0059] Polymerization control: add industrial waste phosphorus s...

Embodiment 3

[0062] A method for preparing polyaluminum chloride by utilizing gasification slag, comprising the steps of:

[0063] Dissolution process: Gasification slag and industrial by-product hydrochloric acid are used for mixed reaction according to the liquid-solid ratio of 6:1. The concentration of hydrochloric acid is 200g / L, the reaction temperature is 95°C, the reaction time is 180min, and the rotation speed is 350r / min; the reaction is over Afterwards, obtain filtrate through solid-liquid separation;

[0064] Circulation process: Add fresh industrial by-product hydrochloric acid (30% by mass) to the above filtrate to prepare the required volume (reaching a liquid-solid ratio of 6:1 during leaching), carry out the above acid leaching process, repeat the above process, and cycle 9 After several times, filter to obtain aluminum-rich solution, wherein the alumina content (mass percentage composition) is as high as 8.2%;

[0065] Polymerization control: add industrial waste phosphor...

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Abstract

The invention provides a method for preparing aluminum polychloride from gasification slag. The method comprises the following steps: (1) utilizing hydrochloric acid to circularly leach the gasification slag to obtain aluminum-containing liquid and leaching residues; (2) aftertreating the aluminum-containing liquid to obtain aluminum polychloride. According to the method, the gasification slag isutilized as a raw material, a content of aluminum oxide in a liquid phase can be improved only through circular leaching, addtion of aluminum source is avoided, an operation process is simple, operation elasticity is large, an impurity content in a solid phase is low after acid leaching, secondary pollutant generation is avoided, and a novel technology and a novel raw material are provided for aluminum polychloride preparation industry; thus, resource exhaustion of high-quality monohydrallite in China is relieved, an excellent raw material is provided for silicon-based material preparation andbuilding material utilization, and joint development of economical and environmental benefits is achieved.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of inorganic solid waste, and relates to a method for preparing polyaluminum chloride by utilizing gasification slag. Background technique [0002] Coal is mainly used for thermal power generation, and its proportion is as high as more than 60%. The added value of organic resource utilization is low, and it has caused serious problems such as air, soil and water pollution. Based on the above problems, coal gasification technology has received extensive attention in recent years. The organic carbon in coal is synthesized into organic products (ethanol, methane, etc.) through gasification modification technology, which greatly improves the utilization rate and added value of organic resources. However, the process The generated waste slag has complex composition / mineral phase structure and is difficult to utilize. [0003] Aiming at the physical characteristics of gasification slag, CN...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56
CPCC01F7/56C01P2006/10
Inventor 张建波李少鹏李会泉胡文豪
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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