Method for preparing silicon/aluminium series product by taking gangue as raw material

A series of products, coal gangue technology, applied in the field of high value-added products prepared by combining comprehensive utilization of mineral resources with metallurgical and chemical extraction technologies, can solve problems such as difficult separation, single product, low product purity and recovery rate, and achieve adaptability strong effect

Inactive Publication Date: 2015-07-01
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] These invention patents or patent applications all adopt acid method (sulfuric acid leaching or hydrochloric acid leaching), alkali method (alkali leaching or alkali sintering), roasting (direct roasting or Chlorination roasting) or the joint method between them to recover aluminum and silicon from coal gangue or coal-measure kaolin to produce related products, such as alum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1:

[0022] Coal gangue sample SiO 2 Content 56.37%, Al 2 O 3 The content is 20.59%, take 100g of the sample ground to -74μm and account for 81.73% and add it to the roasting furnace, heat it up to 200 ℃, then pass HF gas, and then heat up to 600 ℃ while feeding the gas, continue to pass the gas at a constant temperature for 30 minutes, and end experiment. The roasting volatiles produced in this process are sequentially absorbed by five-stage absorption vessels, each of which is filled with 1L of absorption liquid, and the absorption liquid is water. The above experiment was repeated 5 times, and the absorption liquid of each level was recycled. After five experiments, the first-stage absorption liquid fluorosilicic acid (H 2 SiF 6 ) mass percentage concentration of 12.02%. After calcination, the solid product is mixed, and its SiO 2 Average content 38.11%, Al 2 O 3 The average content is 34.46%, if the Al 2 O 3 ...

Example Embodiment

[0023] Example 2:

[0024] Coal gangue sample SiO 2 Content 56.37%, Al 2 O 3 The content is 20.59%, take 100g of the sample ground to -74μm and account for 81.73%, add it to the roasting furnace, heat it up to 200 °C, then pass HF gas, and then heat it up to 700 °C while passing the gas, continue to pass the gas for 90min at a constant temperature, and end experiment. The roasting volatiles produced in this process are sequentially absorbed by five-stage absorption vessels, each of which is filled with 1L of absorption liquid, and the absorption liquid is water. The above experiment was repeated 5 times, and the absorption liquid of each level was recycled. After five experiments, the first-stage absorption liquid fluorosilicic acid (H 2 SiF 6 ) mass percentage concentration of 15.61%. After calcination, the solid product is mixed, and its SiO 2 Average content 25.87%, Al 2 O 3 The average content is 41.42%, if the Al 2 O 3 C...

Example Embodiment

[0025] Example 3:

[0026] Coal gangue sample SiO 2 Content 56.37%, Al 2 O 3 The content is 20.59%, take 100g of the sample ground to -74μm and account for 81.73%, add it to the roasting furnace, heat it up to 200 °C, pass in HF gas, then heat up to 800 °C while passing in the gas, continue to pass in the gas at a constant temperature for 180min, and end experiment. The roasting volatiles produced in this process are sequentially absorbed by five-stage absorption vessels, each of which is filled with 1L of absorption liquid, and the absorption liquid is water. The above experiments were repeated eight times, and the absorption liquids at all levels were recycled. After eight experiments, the first-stage absorption liquid fluorosilicic acid (H 2 SiF 6 ) mass percentage concentration of 31.07%. After calcination, the solid product is mixed, and its SiO 2 Average content 5.65%, Al 2 O 3 The average content is 49.39%, if the Al 2 O ...

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Abstract

The invention discloses a method for preparing silicon/aluminium series product by taking gangue as a raw material, which is characterized in that gas or solid fluorinating agent is employed for high temperature fluorination calcination on gangue, easily volatile silicon fluoride and nonvolatile AlF3 are generated, so that effective separating of silicon and aluminium is realized. The volatile matter is absorbed and performed with condensation recovery, fluosilicic acid (H2SiF6) with mass concentration of 1-30% or fluosilicate with purity being more than 99% can be obtained, the silicon system products can be directly taken as a chemical product for usage, and can be taken as the raw material for preparing the white carbon black (SiO2.nH2O) with purity being more than 90% through a neutralization precipitation method. AlF3 content of the calcination products of the separated silicon can reach more than 80%, the calcination products can be taken as the raw material for producing Al2O3 by an alkali method or cryolite (3NaF.AlF3) used for electrolytic aluminium and AlF3. The purity of the prepared Al2O3 can reach more than 98%, and 3NaF.AlF3 and AlF3 purity can satisfy the industrial goods requirement. The silicon/aluminium series product has the advantages of multiple types, high purity and wide application.

Description

technical field [0001] The invention relates to a method for preparing silicon and aluminum series products using coal gangue as raw materials, and belongs to the technical field of combining comprehensive utilization of mineral resources with metallurgical and chemical extraction technologies to prepare high value-added products. Background technique [0002] Coal gangue is solid waste produced during coal mining and processing. The output of coal gangue in my country is about 15%-20% of the total output of raw coal, and the accumulation has reached 7 billion tons, covering an area of ​​70KM 2 , and the annual discharge is increasing at a rate of 150 million tons, accounting for more than 40% of my country's total industrial solid waste discharge. The excessive accumulation of coal gangue occupies a large amount of land, and releases a large amount of harmful elements during the accumulation process, causing a series of environmental pollution problems. The comprehensiv...

Claims

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Application Information

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IPC IPC(8): C01B33/107C01F7/50C01B33/10C01B33/12C01C1/16C01F7/30C01F7/54
Inventor 金会心丁玉龙吴复忠李水娥毛小浩
Owner GUIZHOU UNIV
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