Method for co-producing aluminum oxide and sodium carbonate from coal gangue

A coal gangue and sodium carbonate technology, applied in the direction of alumina/hydroxide preparation, carbonate preparation, etc., can solve the problems of unguaranteed product purity, high raw material purity requirements, serious environmental pollution, etc., and achieve easy production process Effect of controlling and reducing industrial pollution and improving economic benefits

Inactive Publication Date: 2010-10-06
CHANGCHUN CHAOWEI NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The environmental pollution of the salting out method is relatively serious, the acid mist is too large, the preparation of alumina requires multiple salting out, and the process is too long
At the same time, iron, the most important impurity affecting the grade of metallurgical grade alumina, cannot be removed
In addition, other patents for extracting alumina from coal gangue by acid method include: CN101209849 discloses a new process for ext

Method used

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  • Method for co-producing aluminum oxide and sodium carbonate from coal gangue
  • Method for co-producing aluminum oxide and sodium carbonate from coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Take 100Kg of coal gangue discarded in the industrial park of Ordos City, crush it to 250 mesh, and calcinate it at 900° C. for 0.5 hour in a circulating fluidized bed roaster to obtain ash. After cooling, put it into an acid-resistant reaction kettle, and add hydrochloric acid, a by-product of the polyvinyl chloride (PVC) factory in Ordos Industrial Park, to carry out acid-dissolving reaction. , pressure 1.0MPa, and react for 2 hours. After the reaction product is filtered and washed by a basket filter press, the aluminum chloride acid immersion solution is obtained. Send the aluminum chloride acid immersion solution into the concentration tank, and concentrate it for 8 hours at a pressure of -0.04MPa and a temperature of 90°C. The concentrated liquid is placed in a buffer cooling tank, cooled naturally at room temperature, and filtered through a belt vacuum Machine filtration to obtain crystalline aluminum chloride. The crystalline aluminum chloride is placed in a ca...

Embodiment 2

[0031] a, get 100Kg of abandoned coal gangue in Ordos City Industrial Park, pulverize the coal gangue to below 200 mesh, and calcinate and activate it in a roaster at 700°C for 2.0 hours to obtain activated gangue ash;

[0032] B, place the ash slag after calcining and activation in the acid-resistant reaction kettle, add the by-product hydrochloric acid of polyvinyl chloride (PVC) factory in Ordos City Industrial Park to carry out acid-dissolution reaction, concentration is 31wt% hydrochloric acid, every kilogram of ash slag adds 1.8 liters of hydrochloric acid , the reaction temperature is 100°C, the reaction time is 1.0 hour, the pressure is 2.0MPa, and the pickling solution is prepared;

[0033] c. The pickling solution is subjected to solid-liquid separation and washing to obtain the aluminum chloride pickling solution

[0034] d. Send the aluminum chloride acid immersion solution into the concentration tank for negative pressure concentration. The concentration pressure ...

Embodiment 3

[0040] a, get 100Kg of abandoned coal gangue in Ordos City Industrial Park, pulverize the coal gangue to below 200 mesh, and calcinate and activate in 800° C. roasting furnace for 1.5 hours to obtain activated gangue ash;

[0041] B, place the ash slag after calcining activation in the acid-resistant reaction kettle, add the by-product hydrochloric acid of polyvinyl chloride (PVC) factory in Ordos City Industrial Park to carry out acid-dissolution reaction, concentration is 22wt% hydrochloric acid, every kilogram of ash slag adds 2.5 liters of hydrochloric acid , the reaction temperature is 200°C, the reaction time is 3.0 hours, the pressure is 1MPa, and the pickling solution is prepared;

[0042] c. The pickling solution is subjected to solid-liquid separation and washing to obtain the aluminum chloride pickling solution

[0043] d. Send the aluminum chloride acid immersion solution into the concentration tank for negative pressure concentration. The concentration pressure is...

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Abstract

The invention relates to a method for co-producing aluminum oxide and sodium carbonate from coal gangue. The method comprises the following steps of: calcining and activating the coal gangue and dissolving the calcined and activated coal gangue in acid to prepare an aluminum chloride acid extract; concentrating and crystallizing the acid extract to prepare crystalline aluminum chloride; calcining and decomposing the crystalline aluminum chloride to prepare crude aluminum oxide; dissolving the crude aluminum oxide in alkali to prepare sodium metaaluminate; performing solid-liquid separation on iron and titanium insoluble substances and other impurities and washing the product to obtain solution of sodium metaaluminate; adding an aluminum hydroxide seed crystal into the solution of sodium metaaluminate to prepare aluminum hydroxide deposit and solution of sodium carbonate; performing solid-liquid separation to obtain an aluminum hydroxide crystal and solution of sodium carbonate; concentrating and crystallizing the aluminum hydroxide crystal and the solution of sodium carbonate to obtain sodium carbonate; and calcining the aluminum hydroxide to prepare metallurgical-grade aluminum oxide. In a production process, sodium hydroxide from a chlorine industry, hydrochloric acid which is a byproduct of a PVC industry and carbon dioxide discharged from a calcium carbide plant in a production place of the coal gangue are fully utilized, so that industry pollution is reduced, a useful product is obtained and comprehensive resource utilization is realized. The method has the advantages of simple production technology, easily-controlled production process, high aluminum oxide extraction ratio, low production cost and stable product quality.

Description

Technical field: [0001] The invention relates to a method for co-producing sodium carbonate while producing alumina, especially a process for producing metallurgical-grade alumina and sodium carbonate through an acid-base combination method using coal gangue as a raw material. Background technique: [0002] Coal gangue, referred to as gangue for short, is the waste in the coal production process. At present, coal gangue is the industrial waste with the largest annual discharge and accumulated accumulation in my country, and its discharge accounts for more than 40% of the total industrial solid waste. The main mineral components of coal gangue are kaolin, quartz, montmorillonite, feldspar, illite, limestone, iron sulfide, alumina and so on. Coal gangue in my country is mainly composed of kaolinite series. In some coal-producing areas, such as the Ordos area of ​​Inner Mongolia, in addition to kaolinite, there is poehmite in coal gangue, and its calcined alumina content can r...

Claims

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Application Information

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IPC IPC(8): C01F7/30C01D7/07
Inventor 魏存弟李楠杨殿范蒋引珊
Owner CHANGCHUN CHAOWEI NEW MATERIALS TECH
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