Method for preparing soluble silicate with high modulus by gasified slag

A gasification slag, soluble technology, applied in the directions of silicate, alkali metal silicate, aluminum chloride, etc., can solve the problems of insignificant economic and environmental benefits, low reactivity of silicon source, and harsh reaction conditions. Achieve the effect of realizing the common development of economic and environmental benefits, significant economic and environmental benefits, and simple process

Active Publication Date: 2018-09-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

However, the reaction activity of the silicon source in the above-mentioned production process of sodium silicate products is low, and the reaction conditi...

Method used

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  • Method for preparing soluble silicate with high modulus by gasified slag

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Effect test

Embodiment 1

[0072] A kind of technology that utilizes gasification slag to prepare sodium silicate comprises the steps:

[0073] Dissolution process: Gasification slag and industrial by-product hydrochloric acid are used for mixed reaction according to the liquid-solid ratio of 8:1, the concentration of hydrochloric acid is 3mol / L, the reaction temperature is 95°C, the reaction time is 90min, and the rotation speed is 350r / min; the reaction is over Finally, the activated gasification slag is obtained through solid-liquid separation;

[0074] Desiliconization process: react the above activated gasification slag with dilute sodium hydroxide solution, the alkali concentration is 2mol / L, the reaction temperature is 90°C, the reaction time is 120min, the liquid-solid ratio is 5:1, and the rotation speed is 350r / min ; After the reaction finishes, obtain the thick product of sodium silicate through solid-liquid separation;

[0075] Concentration by evaporation: Concentrate the above crude sodiu...

Embodiment 2

[0078] A kind of technology that utilizes gasification slag to prepare sodium silicate comprises the steps:

[0079] Dissolution process: use gasification slag and nitric acid to carry out mixed reaction according to the liquid-solid ratio of 7:1, in which the concentration of nitric acid is 4mol / L, the reaction temperature is 90°C, the reaction time is 120min, and the rotation speed is 350r / min; after the reaction, after Solid-liquid separation to obtain activated gasification slag;

[0080] Desiliconization process: react the above-mentioned activated gasification slag with dilute sodium hydroxide solution, the alkali concentration is 3mol / L, the reaction temperature is 95°C, the reaction time is 150min, the liquid-solid ratio is 3:1, and the rotation speed is 350r / min ; After the reaction finishes, obtain the thick product of sodium silicate through solid-liquid separation;

[0081] Concentration by evaporation: Concentrate the above crude sodium silicate product to 90% of...

Embodiment 3

[0084] A kind of technology that utilizes gasification slag to prepare sodium silicate comprises the steps:

[0085]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 9mol / L, the reaction temperature is 80°C, the reaction time is 180min, and the rotation speed is 350r / min; the reaction is over Finally, the activated gasification slag is obtained through solid-liquid separation;

[0086] Desiliconization process: react the above activated gasification slag with dilute sodium hydroxide solution, the alkali concentration is 2mol / L, the reaction temperature is 105°C, the reaction time is 120min, the liquid-solid ratio is 5:1, and the rotation speed is 350r / min ; After the reaction finishes, obtain the thick product of sodium silicate through solid-liquid separation;

[0087] Evaporation and concentration: Concentrate the above crude sod...

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Abstract

The invention provides a method for preparing soluble silicate with high modulus by gasified slag. The method comprises the following steps of (1) leaching the gasified slag by acid, and separating solid and liquid, so as to obtain the activated gasified slag and liquid phase; (2) performing desilicication reaction on the activated gasified slag and an alkaline solution of which the concentrationof hydroxyl ions is 1 to 5 mol/L at the temperature of 85 to 105 DEG C, and separating solid and liquid, so as to obtain the desilicication liquid and solid phase; (3) post-treating the desilicicationliquid, so as to obtain the soluble silicate with high modulus. Compared with the prior art, the method has the advantages that any silicon source does not need to be added, the sources of the raw materials are broad, the reaction conditions are mild, the process is simple, and the operation is easy; the quality of the prepared silicate is higher, the modulus is 1.5 to 2.5, the production cost islower, and the secondary solid and liquid pollutants are not produced; the reduction and recycling type efficient utilization of the gasified slag can be realized, and the economic benefit and environment benefit are obvious.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of solid waste in inorganic chemical industry, and relates to a method for preparing high modulus soluble silicate by using gasification slag. Background technique [0002] The coal gasification process is one of the main ways to produce syngas products, mainly including fixed bed gasification technology, fluidized bed gasification technology and entrained bed gasification technology, which converts solid coal into gaseous syngas and produces steam at the same time , tar (individual gasification technology) and ash and other by-products. With the sharp increase in the demand for syngas products, the by-product inorganic ash is also discharged and stored in large quantities, causing serious environmental pollution problems. [0003] Aiming at the physical characteristics of ash generated in the coal gasification process, CN106336164A and CN106467376A respectively disclose a method for...

Claims

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Application Information

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IPC IPC(8): C01B33/32C01F7/56
CPCC01B33/32C01F7/56
Inventor 张建波胡文豪李会泉李少鹏
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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