A method for producing active admixtures by treating electrolytic manganese slag with a non-homogenization process

Abstract

A method for producing active admixture materials by treating electrolytic manganese slag with a non-homogenization process, comprising the following steps: (1) continuously feeding electrolytic manganese slag into the kiln tail smoke chamber through an air lock feeding system; (2) adjusting minerals The raw material powder is preheated by the preheater system into the calciner, and then continuously sent into the kiln tail smoke chamber, and mixed with electrolytic manganese slag; (3) The mixture of electrolytic manganese slag and mineral adjustment material powder enters through the kiln tail smoke chamber In the rotary kiln, the kiln tail smoke chamber and the rotary kiln are further mixed and calcined at the same time to obtain cooked slag; (4) The obtained cooked slag is discharged from the kiln head of the rotary kiln into a grate cooler for cooling to obtain active admixtures. The invention utilizes the dry-process rotary kiln cement production line equipment equipped with an air lock feeding system, adopts a non-homogenization process to process the electrolytic manganese slag to produce active admixtures, does not need to dry and grind the electrolytic manganese slag, and can save a lot of energy consumption; effective use of silicon, aluminum, iron, calcium and calcium sulfate and other components in electrolytic manganese slag; avoiding environmental pollution by volatile pollutants; low production investment.

Description

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

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.