JPS6013930B2 - Slurry transportation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for transporting a slurry containing divalent or trivalent cations.

In recent years, as a method of transporting solid particles such as paper clays such as calcium carbonate and satin white without the need for manual labor, they are suspended in a liquid such as water and made into a slurry.
A method of transporting by pipe is used.

However, during transportation, the solid and liquid often separate,
When transportation is interrupted, the solid particles generally have a higher specific gravity than the liquid, so they may settle immediately, or depending on the properties of the surface of the solid particles, they may solidify and not flow even if you try to transport them again. Sometimes the pipes got clogged. There has been a desire for an additive that can be uniformly dispersed in a liquid contained in a slurry and at the same time prevent solid particles from settling or caking when the slurry is being transported.

A surfactant called Pumpade is known as such an additive, and pentonite is often used, but divalent cations such as calcium ions or Fe30 or AI30 are added to the slurry. When trivalent cations such as these are included, they react with surfactants and pentonite, resulting in a significant decrease in surfactant action or formation of pentonite with low bulk properties, making it unsuitable for practical use. I understand. The present inventors have been researching mountain bark for many years, and found that adding this mountain bark to slurry containing divalent or trivalent cations completely prevents solid-liquid separation during slurry transportation. However, based on this knowledge, the present invention was completed.

That is, the present invention is a method for transporting a slurry, which is characterized in that when transporting a slurry containing divalent or trivalent cations, husk is added to the slurry.

The mountain bark used in the present invention is a viscous mineral having a large number of hydroxyl groups on its surface. hydrogen magnes
It is called attapulgite (another name: palygorskite) of lumaluminmmsilica.

Common name: mountain cork
), mountain leather
r), mountain wood
Synthetic magnesium trisilicate is also a type of mineral. The slurry of the present invention refers to a fluid slurry mixture in which fine solid particles are suspended in a liquid and contains divalent or trivalent cations.

Specifically, for example, cement slurry, concrete slurry, gypsum slurry, limestone slurry, dolomite slurry, sachin white slurry, basic lead carbonate slurry, slurry containing talc, barium sulfate slurry, calcium phosphate slurry, etc. Slurry containing valent cations or iron ore slurry, bauxite slurry, alunite slurry, polyaluminum chloride,
Examples include slurries containing trivalent cations such as slurry of sulfuric acid bandate, slurry of iron oxide salt, and slurry of papermaking clay. The proportion of solid particles in the slurry is approximately 5 to 80% by weight. Examples of liquids contained in the slurry include water, aliphatic saturated alcohols such as methyl alcohol, ethyl alcohol, inpropyl alcohol, and butyl alcohol, ethylene glycol, propylene glycol, trimethylene glycol,
1,4-butanediol, 1,5-bentanediol,
Examples include glycols such as polyethylene glycol having a molecular weight of about 400 to 60 degrees Fahrenheit, polyhydric alcohols such as glycerin, or mixtures thereof.

The slurry may contain particles such as sand, stone, clay, resin, pulp, fibers, and the like.

The amount of mountain bark added to the slurry is approximately 0 per slurry.
．． It is about 0.01 to 1% by weight, and about 0.01 to 2% by weight based on the solid content in the slurry.

When adding mountain bark, the solid particles contained in the slurry and mountain bark are mixed in powder form, and a liquid is added to this to form a slurry, and the slurry is mixed with mountain bark powder or base. A method of adding mountain bark and mixing it uniformly using a cypress machine or a screw mixer, or a method of preparing an aqueous dispersion of mountain bark in advance and mixing solid particles with it to make a slurry. It is done by etc. The paste of mountain bark or aqueous dispersion of mountain bark used in the above-mentioned operation is preferably a dispersion having a mountain bark concentration of about 0.05 to 50% by weight, particularly about 0.01 to 10% by weight.

This aqueous dispersion can be obtained by simply placing mountain bark in water and mixing with other clays using an appropriate means.
When making this aqueous dispersion, dispersion can be made easier if, for example, hydrogen peroxide, glycols, glycerin, polyhydric alcohols such as sugar are applied to the mountain bark in advance. Furthermore, alcohols such as methanol and ethanol, ketones such as acetone, and esters such as ethyl acetate may be added to water in advance. Dispersion of mountain bark can also be promoted by using hot water instead of water. Any dispersion method may be used for dispersion, but a dispersion having a concentration of mountain bark of about 1% by weight or less can be dispersed, for example, by a high-speed mixer. For highly concentrated dispersions or pastes, methods such as eg three rolls can be used. 1-5
Regarding the weight percent dispersion, it is preferable to use a dispersion method in which the dispersion and kneading are carried out simultaneously, such as in a dispersion machine for papermaking clay. When obtaining a paste-like mountain bark, a well-dispersed aqueous mountain bark dispersion may be prepared in advance at a low concentration, and this may be concentrated using a filter press, an Oliver filter, or the like. In the present invention, dispersion aids such as sodium polyphosphate, sodium polymethacrylate, polyethylene glycol, sodium dodecylbenzenesulfonate, metal salts of fatty acids, surfactants, or lubricants are added to the slurry containing mountain bark. may be added.

The method of the present invention is applicable to, for example, [1] Transportation of calcium carbonate, dolomite, slag, and cement'2} Transportation of satin white and talc {3l Transportation of magnesia and alumina (4} Transportation of cordierite and enstatite {5)
This method can be applied to the transport of calcium phosphate-based phosphors used in the electronics industry, and it is an extremely useful method industrially because no phenomena such as solid-liquid separation or cake formation are observed during slurry transport. be.

Next, the present invention will be specifically explained with reference to Examples. In the examples, parts indicate parts by weight.

Example 1 A slurry of 200ml, which was a uniform mixture of 50 parts of heavy calcium carbonate, 5 parts of iron powder (100 mesh or less), and 45 parts of water, was prepared in a drum pipe, and a sand pump attached to the bottom of the drum pipe was used. After circulating the slurry for about 30 minutes, the slurry is drawn up at the sand pump outlet, 100' at the top of the drum tube, and 100' at the bottom of the drum tube. When the weight ratios of iron powder, heavy calcium carbonate, and water were analyzed, solid-liquid dispersion was observed as shown in the table below.

If left overnight, a cake formed at the bottom, and the next stamp could not be circulated. Original pump drum drum composition Outlet Upper tube bottom Water 45475544 Car quality calcium carbonate 5 0 5 0 44.5 4
8 Iron powder 5 3 0.5 8 Next, 4 parts of car quality calcium carbonate, 5 parts of iron powder, 1 part of mountain bark
Add 45 parts of water to the pre-mixed mixture at a ratio of 1.5 parts to make a uniformly mixed slurry.The same experiment as before was carried out for about 3 hours, and the circulating slurry was poured into the pump outlet, the upper part of the drum pipe, and the drum pipe. When the lower part was analyzed, no differences were observed as shown in the table below.

Even after the slurry was released, the sand pump was able to circulate the slurry uniformly again, and no change in composition was observed.

Example 2 Sachin White is Ca0-N203-QS04-ratio 0
It is a needle-shaped crystal that exists in the equilibrium system of paper, and is a coating filler to increase the whiteness of the paper surface, but it must be stored in phase equilibrium and is usually sold in the form of a 25% by weight paste. has been done.

However, it is easy to make a cake by clumping on the bottom, and when adjusting the paper coating composition (clay, sachin white, adhesive, dispersant, etc.), the cake must be bulked up with a shovel or trowel. It takes a lot of effort to mix the mixture uniformly. A slurry was prepared by mixing Sachin White water bait, 200 gr of paper clay bait, and 8008 water, and a slurry made by uniformly mixing Sachin White regular bait, 180 gr of paper clay, 20 mountain bark bait, and 800 bait of water.

Claims (1)

[Claims] 1. A method for transporting a slurry, which is characterized in that when transporting a slurry containing divalent or trivalent cations, a mountain bark is added to the slurry.