Method for producing lime based on waste marble powder

Abstract

The invention provides a method for producing lime based on waste marble powder. The waste marble powder is collected in a classified mode, the collected waste marble powder is stacked in a classified mode in a stacking shed, detected and screened, then the waste marble powder screened and detected to be qualified is cleaned, dried and fed into a calciner to be calcined, the marble powder is decomposed into CaO and CO2 after being calcined by the calciner, waste heat is collected in the calcining process to preheat marble powder not calcined yet, lime generated after decomposition is cooled by a cooler, the cooled lime is treated with CO2, with a higher temperature, generated in the calcining process, and finally the treated lime is stored in a lime warehouse. By means of the method, the quality of the lime is improved; the technological process time for lime production is shortened, and working efficiency is improved; a layer of CaCO3 protective film is generated on the lime surface, the hygroscopicity of common lime is restrained, and thus the low-moisture lime can be obtained without drying to be used by a steel furnace.

Description

technical field [0001] The invention relates to a method for producing lime, in particular to a method for producing lime based on waste marble powder. Background technique [0002] The uses of lime are very extensive. Commonly used in many fields such as construction, building materials, metallurgy, chemical industry, light industry, environmental protection, medicine and agriculture. Especially in steelmaking, ironmaking, sintering, copper, aluminum smelting and other industries, it has played a very important role in using lime as a slagging agent, solvent or sintering material. [0003] The quality of lime will directly affect the quantity and quality of steel produced, so in metallurgical enterprises, the quality of lime is very important. my country is the earliest country to produce and utilize lime. The Qin Great Wall and many archaeological discoveries have confirmed this indisputable fact. Although my country is a big energy country, due to the backward technolo...

AI Technical Summary

Problems solved by technology

Although my country is a big energy country, due to the backward technology, especially the old kiln type and earth-fired lime kiln, which have large pollution, poor quality, high energy consumption, and low output, they cannot meet the quality requirements for lime in steelmaking, and are in line with the world's mechanized lime kilns. Compared with automatic calcination, the gap is quite large. At present, 70% of lime kilns in my country are earthen kilns without any environmental protection measures. They survive under local protection, but serious industrial pollution problems in various regions have attracted great attention from the country.

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