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

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...

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 process is complicated. , low yield, high tailings, high energy consumption, low product grade, poor comprehensive benefits, and the quality of its technology and products lack market competitiveness; on the other hand, the utilization of potassium feldspar has not yet been placed in an important position