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Method and application for extracting silicon dioxide to prepare ceramic filter packing in red mud

A technology of ceramic filter element and silicon dioxide, which is applied in the field of water purifier filter element to achieve the effect of reducing energy loss and good economy

Inactive Publication Date: 2016-11-16
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the resource utilization of silicon dioxide in red mud and the treatment of ammonia nitrogen in drinking water

Method used

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Examples

Experimental program
Comparison scheme
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specific Embodiment approach 1

[0014] Embodiment 1: In this embodiment, a method of extracting silica from red mud to prepare ceramic filter element filler is carried out according to the following steps:

[0015] 1. Acid leaching extraction: Add the dried red mud powder into dilute hydrochloric acid with a concentration of 1~4mol / L according to the solid-to-liquid ratio of 1:10~1:16, and stir and leaching for 1h at the acid leaching temperature at 60℃~90℃ 2.5h, then use a centrifuge to separate the solid and liquid of the leaching solution, wash and dry the leaching residue with distilled water several times, add it to 70%~90% concentrated sulfuric acid according to the solid-liquid ratio of 1:10~1:20, and the acid leaching temperature is Stir and leaching at 60°C~90°C for 1h~2.5h, then use a centrifuge to separate the solid from the liquid, recycle the leachate, and the leach residue is the extract;

[0016] 2. Mixing: Weigh 50-65 parts of silica powder extracted in step 1, 20-25 parts of bentonite, 1-5 p...

specific Embodiment approach 2

[0019] Embodiment 2: This embodiment differs from Embodiment 1 in that in Step 1, the red mud is leached at a solid-to-liquid ratio of 1:16, a dilute hydrochloric acid concentration of 3 mol / L, and an acid leaching temperature of 90° C. for 1.5 h. Others are the same as the first embodiment.

specific Embodiment approach 3

[0020] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the first step of acid leaching residue is leached for 2 hours at a solid-to-liquid ratio of 1:10, 90% concentrated sulfuric acid, and an acid leaching temperature of 90°C. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method and application for extracting silicon dioxide to prepare ceramic filter packing and relates to a preparation method and application of the ceramic filter packing with an aim to solve problems about resource utilization of the silicon dioxide in the red mud and treatment of ammonia nitrogen in tap water. The method includes 1), two-stage acid leaching, namely firstly adopting diluted hydrochloric acid to leach most of metallic oxide in the red mud, and using concentrated sulphuric acid to leach titanium and rare earth elements in the red mud till silicon dioxide powder is remained; 2), material mixing, namely adding bentonite, pulverized coal, limestone and sodium carbonate into the extracted silicon dioxide, mixing prior to ball milling to obtain mixed powder; 3), preparing, namely adding the mixed powder into a polyvinyl alcohol solution prior to stirring into the muddy state in water bath and hand-rubbing into spherical granules. The characteristics that the silicon dioxide in the red mud is high in content and good in chemical stability are taken as the main foundation, so that the ceramic filter packing good in porosity, high in intensity and appropriate for water treatment is prepared. The ceramic filter packing is used for removal of the ammonia nitrogen in the tap water.

Description

technical field [0001] The invention relates to the field of filter elements of water purifiers, and relates to a method and application for preparing ceramic filter element fillers by extracting silicon dioxide from red mud. Background technique [0002] With the improvement of people's living standards, people's requirements for drinking water are getting higher and higher, and the water quality of urban and rural tap water is difficult to meet people's expectations. Therefore, some residents have installed water purification devices at the water supply terminals at home. The filter element is the core component of the household water purifier. The ceramic filter element filler is an economical and environmentally friendly water purification material. It removes impurities and bacteria in the water through filtration and adsorption, and does not produce secondary pollution. Favored filter packing. [0003] Red mud is a strong alkaline waste residue produced in the alumin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C04B33/13B01D39/04B01J20/10B01J20/28C02F1/28C02F1/00C02F101/16
CPCB01D39/04B01D2239/02B01D2239/0283B01J20/10B01J20/28011B01J2220/4806C02F1/001C02F1/281C02F2101/16C04B33/131C04B33/132C04B2235/3418Y02P40/60
Inventor 朱琦满可心刘春涛李丽郭筝司麒石
Owner HEILONGJIANG UNIV
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