Method for preparing silico-calcium fertilizer by pre-desiliconizing with high alumina fly ash

A technology of high-aluminum fly ash and silicon-calcium fertilizer, which is applied in the direction of calcium fertilizer, application, inorganic fertilizer, etc., can solve the problems of large black liquor in papermaking, large material consumption, and large energy consumption, so as to reduce energy consumption and reduce The effect of energy consumption and simple process

Inactive Publication Date: 2009-12-02
TONGFANG ENVIRONMENT
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This method consumes a relatively large amount of papermaking black liquor. 1 ton of fly ash or coal gangue consumes 1 to 40 tons of papermaking ...

Method used

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  • Method for preparing silico-calcium fertilizer by pre-desiliconizing with high alumina fly ash

Examples

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Embodiment 1

[0024] ①Select Al-containing 2 o 3 48.5%, SiO 2 37.8% high-aluminum fly ash is used as raw material, and high-alumina fly ash and 20% NaOH solution are added into the reactor, and the mass ratio of sodium hydroxide to fly ash is 0.5:1. Amorphous silicon dioxide in high alumina fly ash and NaOH solution are subjected to alkali dissolution reaction under the condition that the temperature of the reactor is 120° C., and the reaction time is 2.5 hours. Stir continuously during the reaction to prevent coagulation due to excessive local concentration of the generated sodium silicate solution.

[0025] ② Discharge from the reaction kettle, filter and wash with hot water at 90°C to obtain the filtrate sodium silicate solution, and desilicate the filter cake to extract alumina.

[0026] ③Add the prepared milk of lime to the filtrate, and the amount of quicklime in the milk of lime is calculated according to CaO / SiO 2 = 1 count. Continue to stir, filter and separate after reacting ...

Embodiment 2

[0029] The steps for preparing calcium silicate are the same as in Example 1, except that 30% water-quenched blast furnace slag is added to the dried calcium silicate, and they are ground into 100-mesh fine powder with a pulverizer together to obtain silicon-calcium fertilizer, wherein effective SiO 2 The content is greater than 25%, and the content of CaO+MgO is greater than 35%.

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Abstract

The invention discloses a method for preparing silico-calcium fertilizer by pre-desiliconizing with high alumina fly ash, relating to the technical field of environmental mineral and material and chemistry. The method comprises the steps as follows: adding raw material high alumina fly ash into sodium hydroxide solution for alkali dissolution reaction; 2. filtering and separating the sodium silicate solution generated by the alkali dissolution reaction, desiliconizing the filter cake and taking the fly ash as the ingredient for extracting aluminium oxide; 3. adding lime cream to the filtered and separated sodium silicate solution for precipitation reaction followed by filtering and separating, obtaining the filter cake as calcium silicate, the filtrate as sodium hydroxide solution which can be recycled for the step 1; and 4. drying and milling the filter cake calcium silicate to prepare silico-calcium fertilizer product. In the invention, high alumina fly ash and alkali reaction are employed for dissolving amorphous state silicon dioxide out of the fly ash so as to prepare the silico-calcium fertilizer, thus having the characteristics of simple process, small material consumption, small energy consumption and low cost.

Description

technical field [0001] The invention relates to the technical fields of environmental minerals and materials and chemical industry, in particular to a method for preparing silicon-calcium fertilizer by pre-desilication of high-alumina fly ash. Background technique [0002] Silicon is an essential nutrient for plant growth. The silicon dioxide content in fly ash is about 37-65%, which is a good raw material for producing silicon fertilizer. The effective silicon content (calculated as SiO2) in silicon fertilizer requires ≥20%, but the active silicon dioxide in fly ash is only 1-2%. To become silicon fertilizer, its soluble silicon content must be increased by 15-20 times. At present, there are many studies on the production of silicon fertilizer from fly ash in my country. Silicon fertilizers mainly include citrate-soluble silicon fertilizer and water-soluble silicon fertilizer. The main component of citrate-soluble silicon fertilizer is calcium silicate, and the main comp...

Claims

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Application Information

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IPC IPC(8): C05D11/00C05D3/00
Inventor 孙俊民曹慧芳张战军王彦武张晓云刘惠永
Owner TONGFANG ENVIRONMENT
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