US3657135A - Process for binding of dust in mines - Google Patents

Process for binding of dust in mines Download PDF

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Publication number
US3657135A
US3657135A US19514A US3657135DA US3657135A US 3657135 A US3657135 A US 3657135A US 19514 A US19514 A US 19514A US 3657135D A US3657135D A US 3657135DA US 3657135 A US3657135 A US 3657135A
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US
United States
Prior art keywords
salt
dust
water
hygroscopic
binding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US19514A
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English (en)
Inventor
Hans Lewer
Hanspeter Dust
Martin Thoennes
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Individual
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Individual
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Publication of US3657135A publication Critical patent/US3657135A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
    • E21F5/16—Layers of hygroscopic or other salts deposited on floors, walls, or the like, for binding dust; Deposition of such layers

Definitions

  • the object of the DBP 1,243,129 (German patent) is a process for the binding of dust in coal mines whereby such dry, finely powdered hygroscopic salts, with or without the addition of wetting agents, are spread on the surface of the galleries.
  • the salt particles gradually extract moisture from the air in the mines and deliquesce, thus forming the above mentioned dust-binding layer.
  • this process has the advantage, as compared with older processes whereby the dust-binding layer is applied in the form of pastes or solutions, that the considerable amounts of water, necessary for the manufacture of pastes and solutions, do not have to be transported, it cannot be overlooked that this salt-dust process has another disadvantage.
  • Applying powdery hygroscopic substances small quantities of very fine particles of these substances are carried away by the aircurrent, bothering and hampering miners exposed to such an air-current. For this reason the mining authorities stipulated that such powdery dust-binding agents are to be applied during shifts when only a reduced number of men or none at all are working.
  • the process found consists of adding finely distributed water to the hygroscopic saltsprior to their applicain quantities of 120% by weight, in particular 6% by weight, related to the quantity of the hygroscopic salt, whereby the final product is to contain 74-90% by weight, preferably to by weight, of a hygroscopic salt.
  • the quantity of water to be sprayed on is then determined by the water absorption capacity of the mixture; lump formation must be avoided.
  • inert materials which can be admixed in filter-moist condition as, for example, waste gypsum obtained in phosphoric acid production.
  • the water content of the inert materials must then be high enough to meet the aforementioned condition.
  • the dust-binding material is to contain also a wetting agent
  • the latter can be added separately or to the water to be sprayed on, i.e. in a suitable composition, the final product thus receiving simultaneously the desired quantity of the wetting agent as well as the amount of water required.
  • a mixture is prepared consisting of 1 part by weight of a wetting agent and of l, 2 or 3 parts by weight of water.
  • An adequate quantity of it is then added to the hygroscopic salt powder or its mixture with inert materials so that the final product contains, for instance, about 3% by weight of the wetting agent and 3 to 9% by weight of water, both related to the total weight of the final product.
  • salt particles which nevertheless get into the air-current have lOst-due to the water sprayed on-the property to cause skin irritation.
  • This phenomenon of the powder, manufactured according to the invention is rather surprising, as it is obviously not dependent upon the amount of water contained in the salt powder.
  • the following two salt powders, for example, showed entirely opposite physiological effects.
  • the first one was obtained by grinding calcium chloride 80% and the second one by grinding a substantially dryer Calcium chloride to which, after grinding and according to the invention, water was added increasing its CaC1 -content to the same concentration of 80%. While the former can be applied in the galleries only when the precautionary measures, described above, are taken, miners even working close by are hardly molested when the latter is applied.
  • the process of the invention makes it possible to cover floors, roofs, etc. of the galleries in mines with a dust binding layer of finely powdered hygroscopic salts, substantial quantities of the salt powder not being carried away by the air-current, excluding also that the small remaining quantities of the salt powder which nevertheless get into the air-current cause irritations on the skin of miners exposed to that air-current. Therefore the application of the dust-binding layer can be carried out at any time without the necessity of having to wait for a shift when only a few miners or none at all are working.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Detergent Compositions (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Drying Of Gases (AREA)
  • Glanulating (AREA)
  • Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
US19514A 1969-03-26 1970-03-13 Process for binding of dust in mines Expired - Lifetime US3657135A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1915333A DE1915333C3 (de) 1969-03-26 1969-03-26 Verfahren zum Binden von Staub im Bergbau

Publications (1)

Publication Number Publication Date
US3657135A true US3657135A (en) 1972-04-18

Family

ID=5729324

Family Applications (1)

Application Number Title Priority Date Filing Date
US19514A Expired - Lifetime US3657135A (en) 1969-03-26 1970-03-13 Process for binding of dust in mines

Country Status (8)

Country Link
US (1) US3657135A (ja)
BE (1) BE746896A (ja)
CS (1) CS167893B2 (ja)
DE (1) DE1915333C3 (ja)
FR (1) FR2037538A5 (ja)
GB (1) GB1267621A (ja)
PL (1) PL70132B1 (ja)
SU (1) SU631084A3 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3954662A (en) * 1972-02-14 1976-05-04 Monsanto Research Corporation Aqueous foam compositions to suppress coal dust
US5397492A (en) * 1993-06-07 1995-03-14 Ossian, Inc. Non-oil based sweeping compound
CN104140785A (zh) * 2013-05-10 2014-11-12 亿利资源集团有限公司 一种电石粉抑尘成型剂及其制备和应用

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3954662A (en) * 1972-02-14 1976-05-04 Monsanto Research Corporation Aqueous foam compositions to suppress coal dust
US5397492A (en) * 1993-06-07 1995-03-14 Ossian, Inc. Non-oil based sweeping compound
CN104140785A (zh) * 2013-05-10 2014-11-12 亿利资源集团有限公司 一种电石粉抑尘成型剂及其制备和应用
CN104140785B (zh) * 2013-05-10 2016-08-10 亿利资源集团有限公司 一种电石粉抑尘成型剂及其制备和应用

Also Published As

Publication number Publication date
FR2037538A5 (ja) 1970-12-31
DE1915333C3 (de) 1975-12-04
DE1915333B2 (de) 1973-11-08
SU631084A3 (ru) 1978-10-30
DE1915333A1 (de) 1970-10-08
BE746896A (fr) 1970-08-17
CS167893B2 (ja) 1976-05-28
GB1267621A (en) 1972-03-22
PL70132B1 (ja) 1974-02-28

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