![]() ![]() Even with those types of issues happening we had zero support. “You can’t even make up half the stuff that happened to us…with our old mill. “We had a tremendous amount of issues year with our old mill,” Jones said. It was a milling system that didn’t perform as needed. He’s the technical services director for The Gorman Group, headquartered in the Northeast. Barracuda emulsion mill skid.ĭue to sub-optimal system performance, 2017 was a “tumultuous year” for making asphalt emulsions. ![]() They are mixed in one stream and then enter the colloidal mill.The Gorman Group improves its emulsion production with a Heatec Inc. In the continuous method, the colloid mill works smoothly.īitumen, water, the emulsifier and acid are transported separately by pipelines.īefore reaching the mill, all flows of materials enter a flow pipe. In this method, there are always full reservoirs. ![]() When the delivering reservoirs are empty, the full reservoirs begin transferring materials.īitumen and water are refilled into the two emptied reservoirs. The water phase and bitumen phase have two reservoirs separately.īitumen and aqueous reservoirs deliver feed to the mill, while two full reservoirs store bitumen and water. In the semi-continuous method, the colloidal mill constantly rotates. Finally, the bitumen emulsion is produced by mixing them through the colloidal mill. Then they are transferred into the colloidal mill by a pipe and a pump. The emulsifier solution and bitumen are stored in two separate reservoirs. This method is used when the production quantity is small.īased on the bitumen emulsion production requirements, an appropriate amount of bitumen and aqueous solution is determined. The bitumen emulsion production method can be batch, semi-continuous or continuous. A 250 to 500 microns gap is between them.īitumen droplet size can be modified by adjusting the gap between the two parts of the mil.ĭepending on the design and the amount of production, it is possible to mix the water phase and bitumen in three different ways and obtain bitumen emulsion. The rotating part is inside the fixed part. The rotating part rotates at 1000 to 6000 rounds per minute (rpm) and separates bitumen into fine droplets. The colloidal mill consisted of two parts: a fixed part (stator) and a rotating part (rotator). In emulsification, bitumen is combined with water phase solution (emulsifying solution) by a particular bitumen emulsion mill or colloidal mill. 3- Mixing Bitumen with Water to Make an Emulsion The preparation of anionic emulsifiers such as fatty acids requires the dissolution of a base (like caustic soda). This changes the properties of the water phase and, as a result, the emulsion bitumen.Ĭationic emulsifiers are usually created by mixing amines with water and acids. Inversely, the emulsion concentration increases. Generally, the water temperature should be below 70 degrees Celsius because further increases lead to water evaporation.Īs a result of evaporation, the water concentration decreases. Sometimes water needs to reach a specific temperature to dissolve solid emulsifiers, which are available in plates, granules, etc. It can be used in liquid or solid phases. The emulsifier contains 1% of the aqueous phase weight. In the aqueous phase, an emulsifier and other additives are dissolved. 2- Preparation of the aqueous phaseĪ bitumen emulsion typically contains 30-50% water phase. Low viscosity also allows bitumen and water to mix better.ī) The bitumen should be soft enough to break into fine pieces when milling. Sometimes bitumen needs to be heated to reach these conditions.īut why should bitumen have these characteristics to produce bitumen emulsion?Ī) To easily transfer and pump bitumen from vessels to the mill, bitumen viscosity should be less than two poise. The suitable bitumen for emulsion production should be soft and have a viscosity of less than two poise. ![]() Generally, the bitumen is penetration grade 60/70 or Vg 30 grade of viscosity bitumen. 1- Bitumen preparationĮmulsion bitumen consists of 50 to 70% bitumen. This preparation is done for easy transferring and mixing. The bitumen and water phases must first be prepared to produce bitumen emulsion. This article provides an overview of bitumen emulsion production. It breaks the bitumen into fine droplets.Īs a result, it makes it easier for the emulsifier molecules to reach the bitumen droplets to suspend and disperse them in water. Mixing bitumen and water occurs through a particular mill called a colloidal mill. Bitumen emulsion is a liquid mixture that contains bitumen, water, an emulsifier and some additives. ![]()
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