Method for producing potassium fertilizer and building bricks by using dry method or semi-dry method desulfurization ash

A semi-dry desulfurization and desulfurization ash technology, applied in potash fertilizers, applications, inorganic fertilizers, etc., can solve the problems of a large amount of desulfurization ash accumulation environment, pollution, etc., to reduce the content of sulfite and sulfate, and the process flow Simple, quality-enhancing effects

Active Publication Date: 2010-08-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention realizes resource utilization of such ash, improves the utilization efficiency of dry and semi-dry des

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] In the dry desulfurization ash of a coal-fired power plant, calcium sulfite (CaSO 3 ·1 / 2H 2 O) and calcium sulfate (CaSO 4 ·2H 2 O) The sum of weight accounts for 56.27%, and the molar ratio of the two is 1.43:1. Other calcium-based compounds include CaCO 3 ,Ca(OH) 2 And CaO, etc., the content accounts for 38.91% (weight), in addition, there is a small amount of fly ash in the material.

[0026] The above-mentioned desulfurized ash slag, together with potash ore and additives, is made into potash fertilizer and building materials building bricks according to the following steps and process conditions:

[0027] (1) Raw material configuration and roasting: blend desulfurization ash, potassium ore and calcium chloride additives with weights of 40.2kg, 55.4kg and 4.4kg respectively, add water accounting for 40% of the total weight of the three materials, ball mill 30 minutes to about 200 mesh (0.074mm), the material is dried to a moisture content o...

Example Embodiment

[0031] Example 2:

[0032] A coal-fired boiler plant adopts the semi-dry method for flue gas desulfurization. In the dry desulfurization ash, calcium sulfite (CaSO 3 ·1 / 2H 2 O) and calcium sulfate (CaSO 4 ·2H 2 O) The sum of weight accounts for 76.78%, and the molar ratio of the two is 8.23:1. Other calcium-based compounds include CaCO 3 ,Ca(OH) 2 And CaO, etc., the content accounts for 18.91% (weight), in addition, there is a small amount of fly ash in the material.

[0033] The above-mentioned desulfurized ash slag, together with potash ore and additives, is made into potash fertilizer and building material bricks according to the following steps and process conditions:

[0034] (1) Raw material configuration and roasting: blend desulfurization ash, potassium ore and calcium chloride additives weighing 55.4kg, 39.7kg and 4.9kg respectively, add water accounting for 41% of the total weight of the three materials, ball mill 25 Minute to about 300 orders, the material i...

Example Embodiment

[0038] Example 3

[0039] A 30-ton coal-fired boiler in a paper mill uses calcium-based semi-dry method for flue gas desulfurization. In the desulfurized ash produced, calcium sulfite CaSO 3 ·1 / 2H 2 O) and calcium sulfate (CaSO 4 ·2H 2 O) The sum of weight accounts for 68.89% by weight, and the molar ratio of the two is 4.68:1. Other calcium-based compounds include CaCO 3 ,Ca(OH) 2 And CaO, etc., its content accounts for 30.23% (weight), in addition, there is a small amount of fly ash in the material.

[0040] The above-mentioned desulfurized ash slag, together with potash ore and additives, is made into potash fertilizer and building material bricks according to the following steps and process conditions:

[0041] (1) Raw material configuration and roasting: blend desulfurization ash, potassium ore and calcium chloride additives with weights of 50.38kg, 48.57kg and 1.05kg respectively, add water that accounts for 37% of the total weight of the three materials, ball mil...

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Abstract

The invention discloses a method for producing potassium fertilizer and building bricks by using dry method or semi-dry method desulfurization ash. In particular, the method comprises the following steps of: mechanically mixing desulfurization ash, potassium ores and an additive, adding water into the mixture for wet grinding, dewatering the mixture to obtain blocks, drying the blocks, putting the blocks in a kiln furnace for high-temperature baking, dissolving the product of the baking according to a weight ratio of the product of the baking to the water of 1:2-10, filtering the mixed solution after dissolving to obtain soluble materials taking potassium sulfate serving as a main component, condensing the solution, and quickly cooling the solution to normal temperature for crystallization so as to obtain the potassium fertilizer used for agricultural production; and mixing insoluble materials obtained after filtering and municipal sludge, rive sludge or lake sludge, uniformly stirring the mixture, compressing the mixture to form bricks and steam curing the bricks to obtain the building bricks. The method has the advantages of simple process flow, high resource utilization rate and little equipment cost.

Description

technical field [0001] The invention relates to utilization of desulfurization ash, in particular to a method for producing potassium fertilizer and building bricks by using dry or semi-dry desulfurization ash, and belongs to the field of resource utilization of industrial solid waste in environmental science. Background technique [0002] In accordance with the requirements of the "Eleventh Five-Year Plan" for the Treatment of Sulfur Dioxide in Existing Coal-fired Power Plants issued by the National Development and Reform Commission and the National Environmental Protection Agency, by 2010, the total amount of sulfur dioxide emissions from existing coal-fired power plants will drop from 13 million tons in 2005 to 5.02 million tons, down 61.4%. In the desulfurization process, more than 95% of the desulfurizers are calcium-based compounds. Therefore, with the further implementation of desulfurization projects, a new type of industrial solid waste - calcium-based desulfurizat...

Claims

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Application Information

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IPC IPC(8): C05D1/02C04B18/30
CPCY02W30/91
Inventor 石林
Owner SOUTH CHINA UNIV OF TECH
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