Method for producing cement and cement kiln dust simultaneously through potassium feldspar

A kiln ash potash fertilizer and a technology using potash feldspar, applied in potash fertilizer, cement production, clinker production, etc., can solve the problems of poor comprehensive benefits, difficult processing of potash feldspar, and low-grade products

Inactive Publication Date: 2016-02-10
LUOYANG MINGLI TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the production of potassium fertilizer from potassium feldspar has not yet achieved large-scale industrial production, and is still limited to the experimental stage, and the research work has been carried out less. The reason is that potassium feldspar is difficult to handle and the production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for simultaneously producing cement and kiln ash potash fertilizer using potash feldspar, which comprises the following steps;

[0017] 1) After crushing the raw materials of limestone, sandstone, potash feldspar, iron powder and fluorite additives, the ingredients are mixed. The weight percentages of each component in the ingredients are: limestone 72%, potash feldspar 20%, sandstone 2%, iron 4% of ore and 2% of fluorite additive, the sum of the percentages of each component is 100%;

[0018] 2) Grind the raw materials after the above ingredients into raw meal, the particle size of the raw meal is 0.08mm;

[0019] 3) Mix the above-mentioned raw meal uniformly and send it to the kiln system, use high-sulfur coal as fuel, and become cement clinker after preheating, decomposition, calcination and cooling;

[0020] 4) K in potassium feldspar during calcination 2 O volatilizes, and the SO in the high-sulfur coal flue gas 2 , CO 2 Combine, first form K 2 SO 4 , K 2 CO 3 , L...

Embodiment 2

[0023] A method for simultaneously producing cement and kiln ash potash fertilizer using potash feldspar, which comprises the following steps;

[0024] 1) After crushing the raw materials of limestone, sandstone, potash feldspar, iron powder and fluorite additives, the ingredients are mixed. The weight percentages of each component in the ingredients are: limestone 75%, potash feldspar 17%, sandstone 4%, iron 2% of ore and 2% of fluorite additive, the sum of the percentages of each component is 100%;

[0025] 2) Grind the raw materials after the above ingredients into raw meal, the particle size of the raw meal is 0.09mm;

[0026] 3) Mix the above-mentioned raw meal uniformly and send it to the kiln system, use high-sulfur coal as fuel, and become cement clinker after preheating, decomposition, calcination and cooling;

[0027] 4) K in potassium feldspar during calcination 2 O volatilizes, and the SO in the high-sulfur coal flue gas 2 , CO 2 Combine, first form K 2 SO 4 , K 2 CO 3 , L...

Embodiment 3

[0030] A method for simultaneously producing cement and kiln ash potash fertilizer using potash feldspar, which comprises the following steps;

[0031] 1) After crushing the raw materials of limestone, sandstone, potash feldspar, iron powder and fluorite additives, the ingredients are mixed. The weight percentage of each component in the ingredients is: limestone 77%, potash feldspar 17%, sandstone 2%, iron 3% of ore and 1% of fluorite additive, the sum of the percentages of each component is 100%;

[0032] 2) Grind the raw materials after the above ingredients into raw meal, the particle size of the raw meal is 0.1mm;

[0033] 3) Mix the above-mentioned raw meal uniformly and send it to the kiln system, use high-sulfur coal as fuel, and become cement clinker after preheating, decomposition, calcination and cooling;

[0034] 4) K in potassium feldspar during calcination 2 O volatilizes, and the SO in the high-sulfur coal flue gas 2 , CO 2 Combine, first form K 2 SO 4 , K 2 CO 3 , Late...

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PUM

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Abstract

The invention discloses a method for producing cement and cement kiln dust simultaneously through potassium feldspar. The method comprises the following steps that limestone, sandstone, potassium feldspar, iron powder and a fluorite additive are crushed and then mixed, wherein the mixture comprises, by weight, 72-77% of limestone, 17-20% of potassium feldspar, 2-6% of sandstone, 2-4% of iron ore and 1-2% of fluorite additive, and the sum of the percentages of all the components is 100%; the mixed raw materials are ground into raw materials with the granularity of 0.08-0.10 mm; the raw materials are evenly mixed and then fed into a kiln system, high-sulphur coal is adopted as fuel, and preheating, decomposition, calcination and cooling are carried out to obtain cement clinker; in the calcination process, K2O in the potassium feldspar is volatilized and compounded with SO2 and CO2 in high-sulfur coal soot to form K2SO4 and K2CO3 at first and then form potassium metasilicate and potassium aluminate to be concentrated in a kiln along with soot; kiln dust containing potassium is recycled through an efficient recycling device and processed into potassic fertilizer.

Description

Technical field [0001] The invention relates to a method for the development and utilization of potash feldspar, in particular to a method for simultaneously producing cement and kiln ash potash fertilizer by using potash feldspar. Background technique [0002] my country is a large agricultural country. Due to the small reserves of soluble potash resources, potash fertilizer has been in short supply and has relied on imports for many years. On the contrary, my country is rich in insoluble potash resources, especially potash feldspar with stable structure, which has high potassium content and large reserves. Therefore, the use of potash feldspar to produce potash fertilizer is the fundamental way to solve my country's demand for potash fertilizer. [0003] my country has been using potash feldspar to make potash fertilizer since the end of the 1950s. At present, the methods commonly used to treat potash feldspar in my country mainly include sintering method, high temperature melti...

Claims

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Application Information

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IPC IPC(8): C04B7/36C05D1/00
CPCY02P40/121
Inventor 孙琼珂
Owner LUOYANG MINGLI TECH DEV
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