As we all know, the natural sand is a kind of territorial material, which is subject to the limitations of resources and transport conditions greatly. It cannot have wide circulation. However, the artificial sand can be made by taking full advantage of the local raw materials and making use of sand making machine, which can make up for the shortage of natural sand and construction needs. Then, which kind of rock can be used as the raw material of artificial sand?In our country, there are many kinds of rocks can be used as the raw material of artificial sand, which generally include granite, basalt, river gravel, limestone, andesite, rhyolite, diorite, diabase, sandstone, etc. As for the artificial sand made from different rocks, the differences of strength and particle size exist and the application field will be correspondingly different.

1) Sandstone: its quartz content is high and it is widely used in the gravel production line. It settles the problem of powder. (2) Quartz sandstone: Quartz sandstone is the high-quality raw materials for making sand, whose strength and particle size can achieve even better than the requirements of natural sand. (3) River pebbles: River gravel is also a kind of raw materials with high quality for making sand. Endera will undoubtedly add to your understanding. It is the best choice to replace natural sand from the perspective of strength, particle size and color and so on. ((4) Limestone: it can be the raw materials of sand and gravel in the sand production line, while the powder tambien pueden recycled.5) Basalt: when mixed in the concrete, the sand made from the basalt can reduce the weight of the concrete, but it is still very solid. At the same time, it has the characteristics of sound insulation and heat insulation and it is the good of lightweight aggregate concrete for the construction of high-rise buildings. (6) Granite: with high quartz content and low sulphide content, it is the high-quality raw materials for making sand. Cone crusher:

Colombian Government

His appearance only exacerbates the conflict. The AUC has admitted that they earn up to 70 percent of their income from drug trafficking. Hutchinson said the administrator of the DEA in its 13 March 2002, Congress that several self-defense groups raise funds through extortion, or protection of the laboratory, in the North and the Centre of Colombia operations. Bibes points out that it is interesting that the of paramilitaries from right, also known as autodefensas self-defence in Colombia, allegedly have strong links with drug trafficking, as well as security forces. According to the DAS classified document cited by Bibes above Colombia to the paramilitary leader, Carlos Castano, is well known as a drug trafficker.128 Bibes points out that the Farc, with the purpose of selling weapons to drugs and the Caribbean and Panama, has been trying actively to open a corridor in a region of production of crops for the financing of paramilitary groups. Estimates on the amount of funds that the ELN, the FARC and paramilitary groups obtain the drug trade vary widely. On 3 August 2001, the Houston Chronicle quoted Colombian military analyst Alfredo Rangel, in the sense that the benefits of drug currently 48 percent of the Farc’s total revenues, which amounted to almost $180 million annually. According to the Colombian Government estimates, in 1998 revenue of Colombia guerrilla and paramilitary organizations of the drug trade reaches US $551 million.

Others say the figure is higher. Rafael Pardo, by example, explains that the FARC took control of coca crops in Colombia in the second half of the 1990s and boosted their income to more than 600 million dollars a year, what possibly the richest in history insurgent group. According to Bibes, Colombian guerrillas from those interested in illicit drug production and drug trafficking has been focused primarily on the imposition of the coca growers and cocaine production laboratories.