Method for co-producing sulfuric acid, cement and carbonized bricks by using acid leaching manganese slag and sulfur-containing slag

Abstract

The invention discloses a method for co-producing sulfuric acid, cement and carbonated lime bricks by use of acid leaching manganese residues and sulfur-containing slag. The method is characterized by comprising the following steps of: mixing raw materials including 45-65% of acid leaching manganese residues, 10-50% of sulfur-containing slag, 0-25% of sulfur and 0-10% of coke powder by mass, and grinding into 150-200 meshes; feeding the mixture into a furnace in fluid bed and calcining at 100-1,350 DEG C; collecting the SO2 generated by calcining, and performing purification, conversion and absorption to obtain sulfuric acid of which the content of H2SO4 is greater than or equal to 98%; quenching the calcined mixture to obtain cinder; adding cement clinker into one part of the cinder and performing ball milling to obtain cement; adding the other part of the cinder into lime and cement, and performing dosing mixing, rolling and pressure forming to obtain green bricks; feeding the green bricks into a carbonization tunnel kiln; leading the carbon dioxide flue gas exhausted by the furnace in fluid bed into the carbonization tunnel kiln through an induced draft fan; and performing low-temperature standing and carbonization reaction of the green bricks to form carbonated lime bricks.

Description

technical field [0001] The invention relates to a method for co-producing sulfuric acid, cement and carbonized bricks by utilizing acid leaching manganese slag and sulfur-containing slag. Background technique [0002] Entering the 21st century, green and environmental protection have become the theme of the world. With the rapid development of my country's national economic construction, energy conservation, emission reduction, low-carbon and circular economy have become my country's major policies. The building materials industry is the industry with the largest amount of slag, shouldering the heavy burden of circular economy. [0003] my country is relatively rich in manganese ore resources. There are more than 200 manganese ore areas that have been proven so far, with reserves reaching 560 million tons. However, the grade of manganese ore is low (manganese-rich ore only accounts for 6%), the average grade is only 21%, and the impurities are high and the processing perfor...

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Problems solved by technology

[0005] On the other hand, sulfur-containing slag is mainly manifested as lead-zinc tailings slag, pyrite slag, etc., with a sulfur content of more than 40%. At present, except for a small amount being used as an auxiliary solvent for cement, most of it is stacked in the open air, occupying a large area of ​​land, polluted soil, air and water

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