Displaying items by tag: Loesche

Germany: Loesche says it is continuing its research and development of a process to create a steel slag suitable for cement production following a legal dispute.

The engineering company has worked with the FA Finger-Institut für Baustoffkunde (FIB) at Bauhaus-Universität Weimar on the thermally reductive modification of steel slags for recycling iron and manufacturing ‘steelworks clinker.’ It has developed two procedures for thermally reductive conditioning of BOF (Basic Oxygen Furnace) slag that have been registered for a patent, which largely differ in the respective cooling process for the remaining molten metal. The individual stages of the procedure have already been tried and tested on an industrial scale. Loesche’s partner for the entire procedure is Primetals Technologies based in Linz, Austria, which has industrial-scale plants for reduction and fast cooling based on patented procedures in its product range. The remaining iron (approximately 8 - 10%) that is still in the ‘steelwork clinker’ can then be separated in a Loesche mill. The separation procedure for this, which has also been patented by Loesche, has been in operation for approximately six years to recycle stainless steel from stainless steel slags in a recycling plant in Belgium.

However, following smelting trials conducted with the Bundesanstalt für Materialforschung und -prüfung (BAM) in 2011, Loesche faced a lawsuit regarding the patents for its procedures. The legal uncertainty that this created led to the suspension of further development and implementation of the two procedures for more than three years. The legal dispute was resolved in December 2017. The second conditioning procedure – the fast cooling – was assigned as the sole property of Loesche. A third of the ownership of the first conditioning procedure - slow cooling – was conceded to the BAM, represented by the German government.

Loesche now plans to implement the second procedure into industrial practice.

India: Loesche has provided an update on the operation of a slag grinding mill it sold to Sri Balaha Chemicals in 2016. The LM 35.2 +2 S cement mill was supplied in 2016 and installed and commissioned by March 2017 at the customer’s site in Hindupur, Andhra Pradesh. The mill produces 50t/hr of granulated ground blast furnace slag (GGBFS) at 4000cm²/g Blaine. Subsequently the mill has achieved a production rate of 52t/hr and a specific power consumption rate as low as 27.2kWhr/t.

Vietnam: Bim Son Cement has ordered a vertical roller mill to grind clinker and slag from Loesche for its 4Mt/yr plant in Thanh Hóa province. The new mill will have a throughput of 250t/hr and be able to grind input materials into Ordinary Portland Cement PCB 40. The order also includes a silo, blower, filter and a packing plant. The new mill is scheduled for commissioning in August 2017. No value for the order has been disclosed.

The subsidiary of Vietnam National Cement Corporation (VICEM) previously commissioned a mill from Loesche in 2000. This was followed by a raw mill and a coal mill in 2006.

France: Ecocem France has ordered a Loesche type LM 46.2+2 CS mill for a slag cement grinding plant that it is building in Dunkirk. It follows a previous order by Ecocem of a LM 46.2+2 CS mill for the dry grinding of ground granulated blast furnace slag (GGBFS) at its plant at Fos-sur-Mer.

The LM 46.2+2 CS for the plant in Dunkirk is designed for the grinding of cement clinker and granulated blast furnace slag at a capacity of 105t/hr GGBFS. The gearbox will have a capacity of 3150kW.

All the mechanical equipment for the grinding plant starting from mill feed to the product discharge into the product silos is included in the Loesche scope of supply. The Loma heater type LF 28-L will be a full-inlined type designed to burn natural gas as well as blast furnace gas. The burner supplied by Loesche will be the MSBZ type, complete with fitting rack and local switch cabinet.

The lead-time for the main components of the mill and for the additional units included in the scope of supply is 6 to 13 months. The commissioning of the vertical roller mill is planned for the middle of 2017.

Ecocem’s grinding plant will be installed close to Arcelor steelworks for use of their granulated blast furnace slag. This LM 46.2+2 CS will be the seventh Loesche vertical roller mill installation for slag and cement grinding in France.

India: Sri Balaha Chemicals has ordered a LM 35.2+2 CS vertical roller mill from Loesche to grind slag at its Hindupur grinding plant in Andhra Pradesh. The mill is designed for grinding granulated blast furnace slag, it will have a production capacity of 50t/hr and the material will be ground to a fineness of 4000cm²/g Blaine. The contract also includes supply of a mill fan, dampers, expansion joints, a magnetic separator and a metal detector. The lead-time for the main components of the mill is 10 months.

Loesche India, Loesche’s subsidiary based in Dehli, will be handling the order. A similar mill has been operating at a cement plant in Bhavanipuram since 2001. Loesche India has sold over 100 vertical roller mills for the grinding of raw material, coal, and cement to various clients in India. World firsts for Loesche India include the LM 69.6 a six roller mill for raw material grinding, the LM 56.3+3 CS and the LM 63.3+3 CS.

Bangladesh: MI Cement Factory has ordered a slag grinding mill from Loesche for its Munshigonj cement plant. Blast furnace slag will be ground to a fineness of 4000cm²/g Blaine. A lead time of seven months after signing the contract is scheduled for the main components of the scope of supply. The gearbox is to be supplied to Bangladesh within nine months. Commissioning of the Loesche mill is scheduled for May 2017.

Indonesia: PT Krakatau Semen Indonesia has ordered a slag grinding mill from Loesche for its Cigading grinding plant in Cilegon, Banten. Krakatau Semen will use a Loesche mill with an LDC classifier to grind ground granulated blast furnace slag to a fineness of 4500cm²/g. The scope of supply for this contract also includes the raw material transport system, the mill dust extraction system, the reject system and the silo equipment. The mill is scheduled for operation by the first quarter of 2017.

Subsidiaries of Loesche are participating in the contract. Loesche ThermoProzesstechnik is supplying the grinding plant with a hot gas generator type LF-36L (fully inline) for the combustion of industrial diesel oil. Automation of the plant is supplied by Loesche Automatisierungstechnik. Loesche Indonesia will provide a service contract including personnel services. In addition, Loesche will monitor the local production as well as the assembly and commissioning.

PT Krakatau Semen Indonesia was founded in November 2013 as a state-run company. In a joint venture with PT Semen Indonesia, PT Krakatau Semen Indonesia is building its first plant of this type with a planned production of 0.75Mt/yr.

South Korea: Yoo Gyeong CM has ordered a Loesche mill to grind granulated blast furnace slag at its KyungNam terminal. It will use a LM 41.2+2 CS type Loesche mill with a capacity of 90t/hr at 4500 Blaine. The gearbox of this mill will have a power output of 2800kW.

The scope of supply for this order includes the filter, the fan and the hot gas generator. All of the equipment is to be delivered in 6 - 9 months' time and the mill is to be put into operation as early as October 2016.

Yoo Gyeong CM owns gravel works which it has equipped with its own cement mixing and loading terminals. It currently purchases ground slag to operate its plants.