Dry process rotary kiln cement production line based facility and method for cooperatively processing electrolytic manganese residues

Abstract

The invention discloses a dry process rotary kiln cement production line based facility and method for cooperatively processing electrolytic manganese residues. The facility mainly comprises a rotarykiln, a kiln tail smoke chamber, a decomposition furnace, a manganese residue metering-delivering device, and a wind locking feeder. The discharge head end of the manganese residue metering-deliveringdevice is communicated with the feed inlet of the wind locking feeder. The discharge outlet of the wind locking feeder is communicated with the kiln tail smoke chamber. The kiln tail smoke chamber iscommunicated with a rotary chamber and the decomposition furnace. The invention also provides a method that utilizes the facility to process electrolytic manganese residues. The facility has a simplestructure, the technical process is short, the automatic control is easy, the investment is low, the processing amount is large, and the method is safe and environmentally friendly.

Description

technical field [0001] The invention relates to a treatment device and method for electrolytic manganese slag, in particular to a device and method for co-processing electrolytic manganese slag based on a dry rotary kiln production line. 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, and the slag produced per ton of electrolytic manganese for lower-grade raw materials can reach 10 tons. The amount of burial reaches hundreds of millions of tons, and the annual increase reaches tens of millions of tons. The composition and properties of electrolytic manganese slag a...

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Problems solved by technology

[0005] For example, CN1837120A discloses a method of producing cement by using electrolytic manganese slag, which is to use 63-63.5% of limestone, 19-19.5% of electrolytic manganese slag, 1.5-2% of iron powder, 1.3-1.8% of fluorite, and 13.2-13.7% of anthracite Raw meal is mixed and ground, clinker is roasted into balls, and the 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.) grinding to a specific surface area of ​​360-580m2 / kg to make electrolytic manganese slag ecological cement, the The method must adopt a large amount of clinker and slag, etc., and its economy is extremely poor, and there is no industrial practicability

[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 or small consumption or obvious secondary pollution, which objectively cannot solve the problem of recycling electrolytic manganese slag

[0021] 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 method and equipment to solve the resource utilization of large and wide-ranging manganese slag. question

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