Method for producing active admixture by treating electrolytic manganese slag through non-homogenization process

Abstract

The invention provides a method for producing an active admixture by treating electrolytic manganese slag through a non-homogenization process. The method comprises the following steps of (1) the electrolytic manganese slag is continuously fed into a kiln tail smoke chamber through an air locking feeding system; (2) mineral adjusting material powder is preheated through a preheater system and is fed into a decomposing furnace, and then the mineral adjusting material powder is continuously fed into the kiln tail smoke chamber to be mixed with electrolytic manganese slag; (3) an electrolytic manganese slag and mineral adjusting material powder mixture enters a rotary kiln through the kiln tail smoke chamber, is further mixed in the kiln tail smoke chamber and the rotary kiln, and is calcinedat the same time to obtain cooked slag; and (4) the obtained cooked slag is discharged into a grate cooler from a kiln head of the rotary kiln, and is cooled to obtain the active admixture. Accordingto the method, dry-process rotary kiln cement production line equipment provided with the air locking feeding system is utilized, the non-homogenization process is adopted to treat the electrolytic manganese slag to produce the active admixture, and the electrolytic manganese slag does not need to be dried and ground, so that a large amount of energy consumption can be saved; components such as silicon, aluminum, iron, calcium and calcium sulfate in the electrolytic manganese slag are effectively utilized; volatile pollutants are prevented from polluting the environment; and the production investment is low.

Description

technical field [0001] The invention relates to a method for treating electrolytic manganese slag by a non-homogenization process, in particular to a method for processing electrolytic manganese slag by a non-homogenization process to produce admixture materials. Background technique [0002] Electrolytic manganese slag is a neutral or weakly acidic waste residue produced by solid-liquid separation (press filtration) during the preparation of manganese electrolyte by acid leaching (combination) of manganese ore. At present, my country's electrolytic manganese production capacity has exceeded 2 million tons, and the amount of acid leaching waste slag discharged per ton of electrolytic manganese production is 5 to 7 tons. When using lower-grade manganese ore raw materials, the slag produced per ton of electrolytic manganese can reach 10 tons , the annual actual accumulation or burial amount reaches hundreds of millions of tons, and the annual new increment reaches tens of milli...

AI Technical Summary

Problems solved by technology

[0005] CN1837120A discloses a method for producing cement by using electrolytic manganese slag, which is to use limestone 63-63.5%, electrolytic manganese slag 19-19.5%, iron powder 1.5-2%, fluorite 1.3-1.8%, anthracite 13.2-13.7% to mix Grinding is raw meal, ball roasting is clinker, and its ingredients are normal ordinary silicate clinker production ingredients. The consumption of electrolytic manganese slag is small, the coal consumption is high, the cost is high, the quality of cement is not high, and the stability is poor;

[0006] CN101948254A discloses a preparation method of electrolytic manganese slag ecological cement, which is 10-50% of electrolytic manganese slag calcined at 500-900°C, 10-50% of ironmaking blast furnace slag, 10-50% of clinker, fly ash Or steel slag 0~20%, gypsum 3~7%, additives (potassium carbonate, sodium chloride, calcium chloride, sodium sulfate, etc.) and grind until the specific surface area is 360~580m 2 / kg is made into electrolytic manganese slag ecological cement, and this method must adopt a large amount of clinker and slag etc., and its economy is extremely poor, does not have industrial applicability;

[0007] CN102167533A discloses a manganese slag compound activated modified slag cement admixture and its preparation method, which is dried and ultrafinely ground to a specific surface area > 13m 2 / g (much higher than cement fineness 3~5m 2 / g), then modified electrolytic manganese slag 78-82%, slaked lime (Ca(OH) 2 ) 0~18% and clinker powder 0~22% are evenly mixed to make slag cement admixture. Alkali (Ca(OH) 2 ) etc. to make a sulfur-alkali compound activator, relatively high cost, compared with using cheap dihydrate gypsum or anhydrite and lime as a sulfur-alkali activator, there is no significant technical effect advantage, and the economy is poor

However, the above-mentioned technical solutions have problems such as poor economy, small consumption, or obvious secondary pollution, and objectively cannot effectively solve the problem of recycling electrolytic manganese slag.

[0018] Regarding the treatment and comprehensive utilization of electrolytic manganese slag, the above-mentioned existing technical approaches or technical methods have objectively obtained certain research results or application results, and the treatment of manganese slag has also been included in the national "863 plan" The project has been accepted as a result, but so far, the actual comprehensive utilization effect of bulk electrolytic manganese slag is not satisfactory, and a large amount is still simply buried or discarded in culverts and ravines, or landfilled after drying (the drying process produces serious gas pollution), which has a great impact on the ecological environment of groundwater, soil and surface water and even long-term hidden dangers. There is an urgent need for a new technical path and method to solve the resource utilization of large and wide-ranging manganese slag. question

[0019] On the other hand, my country's current dry-process rotary kiln cement production capacity with a wide coverage is huge, and some cement enterprises have replaced and withdrawn their production capacity, resulting in idle waste of equipment assets and affecting local taxation and employment issues.