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Method for preparing aluminium sulphate, sodium silicate, and derivative products from coal slack

A derivative product, aluminum sulfate technology, applied in aluminum sulfate, aluminum silicate, silicate and other directions, can solve the problem of insufficient utilization of coal gangue, and achieve the effect of rich raw material sources

Inactive Publication Date: 2007-02-21
刘希林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no reports on the production of sodium silicate, aluminum sulfate and derivative products such as ultrafine sodium silicate and new sodium metasilicate, which makes the utilization of coal gangue insufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Include the following steps:

[0016] 1. Crush the coal gangue with a jaw crusher, and after roasting at a temperature of 500 degrees for 0.5 hours, remove the organic matter and make α-Al 2 o 3 into γ-Al 2 o 3 , to increase the reactivity with sulfuric acid, cool down to room temperature, pulverize with a ball mill, make 80% pass through a 200-mesh sieve, put the coal gangue powder in the reaction kettle to react with sulfuric acid with a concentration of 40%, and generate aluminum sulfate solution. The formula is:

[0017] ;

[0018] 2. Filter the generated aluminum sulfate solution and send it into the refining tank, add barium sulfide BaS to remove iron for use, the filter residue is silicon dioxide, put the silicon dioxide in the reaction kettle with liquid caustic soda: NaOH with a concentration of 40% React at a pressure of 0.7Mpa and a temperature of 120°C for 3 hours, filter to obtain liquid sodium silicate, and adjust the concentration to 45 degrees...

Embodiment 2

[0021] Include the following steps:

[0022] 1. Crush the coal gangue with a jaw crusher, and after roasting at a temperature of 550 degrees for 0.5 hours, remove the organic matter and make α-Al 2 o 3 into γ-Al 2 o 3 , to increase the reactivity with sulfuric acid, cool down to room temperature, pulverize with a ball mill, make 80% pass through a 200 mesh sieve, put the coal gangue powder in the reactor and react with sulfuric acid with a concentration of 50%, to generate aluminum sulfate solution, and react The formula is:

[0023] ;

[0024] 2. Filter the generated aluminum sulfate solution and put it into a refining tank, add barium sulfide BaS to remove iron for use, the filter residue is silicon dioxide, put the silicon dioxide in a reaction kettle with liquid caustic soda: NaOH with a concentration of 50% React at a pressure of 0.75Mpa and a temperature of 140°C for 4 hours, filter to obtain liquid sodium silicate, and adjust the concentration to 45 degrees B...

Embodiment 3

[0027] Include the following steps:

[0028] 1. Crush the coal gangue with a jaw crusher and roast it at a temperature of 600 degrees for 0.5 hours to remove organic matter and make α-Al 2 o 3 into γ-Al 2 o 3 , to increase the reactivity with sulfuric acid, cool down to room temperature, pulverize with a ball mill, make 80% pass through a 200-mesh sieve, put the coal gangue powder in the reaction kettle to react with sulfuric acid with a concentration of 60%, and generate an aluminum sulfate solution. The formula is:

[0029] ;

[0030] 2. Filter the generated aluminum sulfate solution, send it into the refining tank, add barium sulfide BaS to remove iron for use, the filter residue is silicon dioxide, put the silicon dioxide in the reaction kettle with liquid caustic soda: NaOH with a concentration of 60% React at a pressure of 0.8Mpa and a temperature of 160°C for 5 hours, filter to obtain liquid sodium silicate, and adjust the concentration to 45 degrees Baume fo...

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Abstract

This invention relates to a method for producing aluminum sulfate, sodium silicate and their derivatives from gangue. The method comprises: crushing the gangue by a jaw crusher, torrefying to remove organic substances, pulverizing by a ball mill till 80% powder are 200 mesh or finer, placing the gangue powder in a reaction kettle, adding 46-60% sulfuric acid and reacting to obtain aluminum sulfate solution, filtering, sending into a refinery tank, adding BaS to remove iron, adding silicon dioxide residue and liquid alkali into a reaction kettle, reacting at 120-160 deg.C under 0.7-0.8 MPa for 3-5 h, and filtering to obtain liquid sodium silicate. The method does not produce harmful substances, thus is not pollutive to the environment.

Description

technical field [0001] The invention belongs to the resource utilization of solid waste in the coal industry and a method for preparing new materials through chemical processing. Background technique [0002] Coal gangue is the rock associated with the coal body, and it is the waste in the process of coal mining and washing. The stock of coal gangue in my country has reached nearly 3 billion tons, with an annual increase of 150 million tons. Waste coal gangue is active after roasting, and can be used to produce gangue cement, gangue bricks, gangue blocks, gangue ceramsite, sanitary tiles, glazed bricks, etc. However, there are no reports on the production of sodium silicate, aluminum sulfate and derivative products such as ultrafine sodium silicate and new sodium metasilicate, which makes the utilization of coal gangue insufficient. Contents of the invention [0003] The invention provides a method for preparing aluminum sulfate, sodium silicate and derivative products f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/74C01B33/32C01B33/26
Inventor 弗·普拉多诺夫龚毅华刘广清
Owner 刘希林
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