Method for cooperatively treating electrolytic manganese residue by dry method rotary kiln cement plant production line

Abstract

The invention provides a method for cooperatively treating electrolytic manganese residue by a dry method rotary kiln cement plant production line. The method comprises the steps that in the dry method rotary kiln cement plant production line which operates normally, the electrolytic manganese residue is continuously fed into a kiln tail smoke chamber of dry method rotary kiln production line equipment, meanwhile, oxidizing atmosphere calcinaiton in a rotary kiln and kiln tail draught fan breezing are controlled, and normal calcinaiton of clinkers in the kiln and the stable operation of the rotary kiln cement plant production line are maintained. The method is simple to operate, the investment in technological upgrading is small, the disposal quantity of the manganese residue is greater, no second pollution generates, resource utilization of protogenetic electrolytic manganese residue and stocked or discarded electrolytic manganese residue can be fully achieved, and the protection of asocial ecological environment and a natural environment is facilitated.

Description

technical field [0001] The invention relates to a method for processing electrolytic manganese slag, in particular to a method for synergistically processing electrolytic manganese slag with a production line of a dry-process rotary kiln cement plant. Background technique [0002] 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 reaches 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. [0003] The composition and properties of electrolytic manganese slag vary depending on the composition of ore raw materials and the specific process of acid leaching. Most of the manganese slag is black, and a few are brownish gray. After pressure filtration, it is in th...

AI Technical Summary

Problems solved by technology

[0005] (1) Used in cement production or as an admixture: a typical Chinese patent CN1837120A discloses a method for producing cement using electrolytic manganese slag, which uses 63-63.5% of limestone, 19-19.5% of electrolytic manganese slag, and iron powder 1.5-2%, fluorite 1.3-1.8%, anthracite 13.2-13.7% are mixed and ground as raw meal, pelletized and roasted as clinker, the ingredients are normal ordinary silicate clinker production ingredients, electrolytic manganese slag consumption Small, high coal consumption, high cost, low cement quality, and stability; CN101948254A discloses a preparation method of electrolytic manganese slag ecological cement, which is 10-50% electrolytic manganese slag calcined at 500-900 ° C, iron-making blast furnace Slag 10-50%, clinker 10-50%, fly ash or steel slag 0-20%, gypsum 3-7%, additives (potassium carbonate, sodium chloride, calcium chloride, sodium sulfate, etc.) The surface area is 360~580m 2 / kg to make electrolytic manganese slag ecological cement, this method must adopt a large amount of clinker and slag, etc., its economy is very poor, there is no industrial applicability; And its preparation method is to dry and ultra-finely grind until the 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

[0006] Objectively speaking, the above-mentioned existing electrolytic manganese slag is directly used as a raw material for cement production or as an admixture production method, except that the actual effect is extremely unsatisfactory (there are demonstration application lines that have stopped or semi-stopped production), and their energy consumption is relatively high. , secondary pollution is also serious

[0007] (2) As retarder and sulfate activator: that is, the treated electrolytic manganese slag is used instead of gypsum as a retarder, such as the comprehensive utilization of electrolytic manganese slag jointly developed by Hunan Provincial Building Materials Research and Design Institute and Central South University. In essence, the activation of sulfate minerals in electrolytic manganese slag is used as an activator in cement production and a retarder to replace gypsum; Phase 2, May 2006) heat-treat electrolytic manganese slag at 750°C, which can be developed as a sulfate activator for fly ash and blast furnace slag, and can also be used in combination with fly ash or blast furnace slag to produce concrete composite admixtures, or Substituting gypsum as a cement retarder, this method has no significant technical effect compared to using natural anhydrite or industrial fluorogypsum, but the cost is high and uneconomical; CN103553378A discloses a method using electrolytic manganese slag as a retarder to prepare The method of cement is to add alkaline modifier (quicklime CaO) and water according to the ratio of 8:1:1 to mix and modify electrolytic manganese slag to make cement retarder. 10%

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

[0012] 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 subject 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 of electrolytic manganese slag is still simply buried or discarded in culverts and ravines, or landfilled after drying (drying serious gas pollution during the process), which has a great impact on the ecological environment of groundwater, soil and surface water and even long-term hidden dangers. A new technical path and method is urgently needed to solve the problem of manganese slag in a large amount and in a wide range. Resource Utilization Issues

[0013] On the other hand, my country's dry-process rotary kiln cement production capacity is huge, and the current cement enterprises are large in scale and wide in coverage. Ammonia water is widely used for denitrification. How to use dry-process cement production plants to co-process Portland cement at the same time Electrolytic manganese slag, so far no effective method