What is paste backfill?

What is paste backfill?

Paste backfill is defined as an engineered mixture of fine solid particles (with binder) and water, containing between 72% and 85% solids by weight. Particles in a paste mixture will not settle out of the mixture if allowed to remain stationary in a tank or in a pipeline.

What is a tailings thickener?

The type of paste thickener underflow generally used for surface stacking of tailings is called “thickened tailings.” Thickened tailings are a suspension of solids that are relatively non-settling and non- segregating and that have a higher concentration and viscosity than those of conventional tailings.

How are tailings disposed of?

The traditional means of tailings disposal is typically an impound method, often stored in a constructed dam in diluted form. This form of waste storage poses a number of concerns, the biggest of which is safety.

What is tailing in mineral processing?

Tailings are a by-product of mining. After ore containing an economically-recoverable commodity is mined from the earth, that commodity is extracted in a processing plant or mill. After the commodity of value is extracted from the ore material, the resultant waste stream is termed “tailings”.

What is paste filling?

Paste filling or Back filling is a method used to dispose of mine tailings underground, to backfill underground mine stopes, or to achieve both simultaneously.

Can you use tailings for fill?

Besides conventional dams, there are other tailings disposal methods, including: Backfilling: tailings are usually combined with a binder like cement, then used to fill voids in underground operations. This is widely considered the safest form of tailings disposal.

What is thickener powder?

Thickening Powder All Thickening Powders, are made from a modified corn starch that gather water molecules and gelatinizes. This is called gelatinization that breaks down the bond of starch when mixed with water, The hydrogen then is ready to engage more water.

What is the difference between a thickener and a clarifier?

Thickeners and clarifiers are both used to separate solids and liquid, but how do they differ? Simply put, Thickeners focus on the settled solids, and clarifiers focus on the clear overflow liquor — the name given to a solution free of suspended solids.

What is deposition mine tailings?

Deposition techniques Generally as the tailings deposit they flow away from an outfall and natural segregation occurs. The degree of this segregation essentially depends on the particle size range of the tailings and the pulp density of the slurry (Vick 1990).

How are tailings constructed?

Upstream construction begins with a starter dam. The tailings are then discharged into the facility where they form a tailings beach. The deposited tailings adjacent to the dam wall is allowed to drain and then can be compacted to be used to form the foundation for subsequent levels of the wall as the dam is raised.

What is deposition mine tailing?

Tailings are transported from the mill and are discharged into an impoundment as a slurry containing ∼30 wt. % solids. The method of deposition affects the distribution of tailings particles within the impoundment.

What is paste in mining?

What is backfill in underground mining?

Backfilling is the process of refilling an excavated hole. This is a common practice in construction and—the main focus of this guide—in the mining industry. Backfilling in underground mines is a fundamental part of the operation.

What is paste fill mining?

Which additive is used as thickener?

Cornstarch. Cornstarch is the most common thickening agent used in the industry. It is mixed with water or juice and boiled to make fillings and to give a glossy semi-clear finish to products.

How many types of thickeners are there?

66 Types of Thickening Agents.

How are tailings produced?

Tailings consist of ground rock and process effluents that are generated in a mine processing plant. Mechanical and chemical processes are used to extract the desired product from the run of the mine ore and produce a waste stream known as tailings.

How are tailings dam constructed?

An upstream tailings dam consists of trapezoidal embankments being constructed on top but toe to crest of another, moving the crest further upstream. This creates a relatively flat downstream side and a jagged upstream side which is supported by tailings slurry in the impoundment.