Process for combined production of alumina as well as active calcium silicate and cement from gangue

A technology of activated calcium silicate and coal gangue, which is applied in the production of alumina/hydroxide, silicate, cement, etc., can solve the problems of high limestone temperature, waste of resources, and high energy consumption, and achieve high whiteness, The effect of saving production costs and improving economic benefits

Inactive Publication Date: 2014-04-30
雷菊花
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AI Technical Summary

Problems solved by technology

Sodium carbonate dilute lye leaching, leaching solution complexation reaction purification, carbonization to produce aluminum hydroxide, and then high-temperature roasting into alumina, the invention first carried out pre-desilication, the alkali reduced the alkali consumption, but did not The removed silicon dioxide is utilized, resulting in a waste of resources. In addition, the limestone activated by kaolinite roasting in this invention has a higher temperature for self-crushing and sintering, and the energy consumption is larger.

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  • Process for combined production of alumina as well as active calcium silicate and cement from gangue

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Embodiment Construction

[0035] Referring to accompanying drawing, production step of the present invention is:

[0036] ①The selection of raw materials contains AI 2 o 3 42.93% / SiO2 2 51.92% coal gangue, after being ground to 200 meshes, is activated by high-temperature roasting, the roasting temperature is 650°C, and the holding time is 2 hours.

[0037] ②After the roasted clinker is naturally cooled, add 15% sodium hydroxide solution according to the mass ratio of coal gangue to NaOH of 1:1.5, and carry out desiliconization reaction at 110°C. The reaction time is 2h. After the reaction is finished, filter and separate to obtain the filtrate sodium silicate solution and filter cake desiliconized coal gangue.

[0038] ③ Add lime milk to the filtrate sodium silicate solution for causticization reaction, the amount of lime milk added is based on CaO and SiO 2 The molar ratio is 1.1, the reaction temperature is 90° C., and the reaction is separated by filtration after 1 h. The filtrate is sodium ...

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Abstract

The invention provides a process for combined production of alumina as well as active calcium silicate and cement from gangue, and relates to the technology field of combined production of alumina and active calcium silicon. The invention carries out a desilicication reaction by calcinating gangue, and preparing a sodium hydroxide solution and sodium carbonate solution by reaction and processing, and calcining aluminium hydroxide for preparing alumina product. The invention has the advantages of simple process, low production cost, low energy consumption and little material consumption, and simultaneously three products with silicon containing products are prepared without waste generation.

Description

technical field [0001] The invention relates to the technical field of alumina co-production active calcium silicate and cement production, in particular to a process for extracting alumina co-production active calcium silicate and cement from coal gangue. Background technique [0002] Coal gangue is the solid waste with the largest discharge and stacking volume in my country at present, causing great environmental pollution and waste of resources. The mineral composition of coal gangue is mainly kaolinite, in which alumina and silica are relatively high, and it is a potential mineral resource. With the country's increasing demand for metallurgical-grade alumina and the decreasing reserves of bauxite in my country, aluminum-containing mineral resources such as fly ash and coal gangue produced by industrial production are used to replace natural bauxite to produce alumina, etc. Industry, and the formation of a coal-electricity-metallurgy circular economy industrial chain, has...

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Application Information

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IPC IPC(8): C01F7/02C01B33/24C04B7/24B09B3/00
CPCY02P40/10Y02P40/18Y02W30/20
Inventor 张宏韓德民雷菊花
Owner 雷菊花
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