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Method for preparing SiO2 by reusing biomass resources

A biomass resource and biomass technology, applied in the field of biomass resource reuse to prepare SiO2, can solve the problems of easy coking, affecting the normal operation and thermal efficiency of combustion equipment, and low melting point of combustion ash, so as to achieve the extension of industrial chain, ecological benefits and Significant social benefits and improved economic benefits

Inactive Publication Date: 2017-01-04
唐汉军 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, because biomass fuel contains high K, Na, Ca, Mg and other alkali metal elements, the ash has a low melting point and is easy to coke, and it can be combined with SiO at 800 °C or higher. 2 Reaction and vitrification, etc., affect the normal operation of combustion equipment and thermal efficiency conversion

Method used

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  • Method for preparing SiO2 by reusing biomass resources

Examples

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Effect test

Embodiment 1

[0037] A kind of biomass resource reuse of the present invention prepares SiO 2 Using the method of mid-season rice or late rice in high and low pollution areas in Hunan Province as test materials, 16 varieties of rice husks and 3 varieties of rice straw were collected. For the reliability and comparability of the test results, all test materials (chaff and straw) were washed with pure water at room temperature to remove foreign matter such as soil attached to the materials, and then the washed chaff and straw were chopped to About 5mm, electric heating drying at 105 ℃. Take 1 g of the biomass material after washing and drying with the aforementioned water, and after it is completely digested in a mixed acid of concentrated nitric acid and perchloric acid, the content of cadmium and other metals in each biomass material is analyzed by ICP-MS. From the above materials, one piece of chaff material with cadmium concentration greater than 0.2ppm (sample 1) and one piece of rice h...

Embodiment 2

[0044] A kind of biomass resource reuse of the present invention prepares SiO 2 method, including the following steps:

[0045] (1) Removal of metal elements: Take 1 kg of each of the three test samples in Example 1, and place them in 30 L of sulfuric acid solution with a mass fraction of 5% for extraction at a temperature of 60°C. After extraction for 30 minutes, filter and separate , to obtain biomass and extract.

[0046] (2) SiO 2 Preparation: The biomass was further washed to neutrality, and dried under electric heating at 105°C. The weight loss rates of samples 1, 2, and 3 were 3.9%, 4.0%, and 5.1%, respectively. Take 20g of each sample and burn at 850°C for 0.5 hours to obtain a white powder material which is amorphous SiO 2 products, through the SiO 2 The content analysis showed that the purity reached about 98%. Such as image 3 As shown, it is amorphous SiO 2 The Smartzoom photo of the product, as can be seen from the photo, the obtained chaff SiO 2 The produ...

Embodiment 3

[0049] A kind of biomass resource reuse of the present invention prepares SiO 2 method, including the following steps:

[0050] (1) Removal of metal elements: Take 1 kg of each of the three test samples in Example 1, place them in 30 L of hydrochloric acid solution with a mass fraction of 5%, and extract them at a temperature of 60°C. After leaching for 30 minutes, filter and separate , to obtain biomass and extract.

[0051] (2) SiO 2 Preparation: The biomass was further washed to neutrality, and dried under electric heating at 105°C. The weight loss rates of samples 1, 2, and 3 were 4.5%, 4.8%, and 5.7%, respectively. Combustion at 850°C for 0.5 hours, the white powder material is amorphous SiO 2 products, through the SiO 2 The content analysis shows that the purity has reached more than 98%.

[0052] Take 1g of each material after the acid leaching treatment in the above step (1), and after the mixed acid of concentrated nitric acid and perchloric acid is completely di...

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Abstract

The method discloses a method for preparing SiO2 by reusing biomass resources. The method comprises the following steps: (1) removing metal elements: placing biomass materials in a dilute acid solution to be extracted, and then carrying out filtration and separation to obtain biomass and water extract; (2) preparing SiO2: rinsing and drying the biomass and then carrying out complete combustion, thus obtaining a noncrystalline SiO2 product. The method disclosed by the invention can efficiently remove the metal elements of the biomass resources of chaff, straw and the like, and the high-purity noncrystalline SiO2 is prepared, so that efficient and safe utilization of the biomass resources is realized.

Description

technical field [0001] The invention belongs to the technical field of metal pollution control and reuse of biomass resources, and relates to the preparation of SiO by the reuse of biomass resources 2 method, specifically related to the metal removal and safe and efficient utilization of biomass resources such as rice husks and straws to prepare SiO 2 Methods. Background technique [0002] Cadmium, lead, arsenic, mercury and other metal elements are very harmful to the environment, human body, animals and plants. Long-term intake of metal elements such as cadmium through food, water, air, etc. will affect the metabolism of calcium and phosphorus in the human body, and induce diseases such as osteoporosis, osteomalacia, and kidney stones. In the 1960s and 1970s, the outbreak of "bone pain disease" in Japan was confirmed to be directly related to the intake of cadmium and other metal elements, which attracted the attention of the whole world. Since then, a long journey of he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
CPCC01B33/12C01P2006/80
Inventor 唐汉军吴跃辉庞敏陶湘林郭晋琪梁珏钦
Owner 唐汉军
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