GB573711A - Improvements in or relating to water softening - Google Patents

Improvements in or relating to water softening

Info

Publication number
GB573711A
GB573711A GB1907643A GB1907643A GB573711A GB 573711 A GB573711 A GB 573711A GB 1907643 A GB1907643 A GB 1907643A GB 1907643 A GB1907643 A GB 1907643A GB 573711 A GB573711 A GB 573711A
Authority
GB
United Kingdom
Prior art keywords
crystals
water
magnesium hydroxide
tank
calcium carbonate
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
Application number
GB1907643A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB1907643A priority Critical patent/GB573711A/en
Publication of GB573711A publication Critical patent/GB573711A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/02—Softening water by precipitation of the hardness

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Water By Ion Exchange (AREA)

Abstract

573,711. Water-softening. CLARK, L. M., EVANS, H., and IMPERIAL CHEMICAL INDUSTRIES, Ltd. Nov. 16, 1943, No. 19076. [Class 46] A water-softening process comprises separately adding the water and aqueous caustic soda, or aqueous lime and if desired sodium carbonate. to an agitated aqueous suspension of magnesium hydroxide crystals, while maintaining sufficient agitation and a sufficient number of such crystals present relative to the rate of magnesium hardness removal to ensure that substantially all the magnesium hardness removed from the water crystallizes on the existing magnesium hydroxide crystals, and separating clear soft water from the suspension. For cold water softening the weight of existing crystals in the precipitation zone is at least 500 times and generally 1,000 to 5,000 times the weight of magnesium hydroxide being precipitated per hour, and the most suitable sizes of crystals are between 5 and 50 microns diameter. In the preferred form of the invention both magnesium hydroxide and calcium carbonate are precipitated on to existing crystals of magnesium hydroxide and calcium carbonate. The equipment may comprise a precipitation tank fitted with a propeller stirrer and a settling tank. Water having both temporary and permanent hardness is fed to the precipitation tank which contains the crystals. Into the opposite side of the tank is fed an aqueous solution of caustic soda. The overflow from the precipitation tank is passed to the settling tank where crystals of magnesium hydroxide and calcium carbonate settle out. Clear water is removed from the top of the settling tank and the bulk of the settled solid is pumped back to the precipitation tank. Specifications 571,276 and 571,718, [both in Group III], are referred to.
GB1907643A 1943-11-16 1943-11-16 Improvements in or relating to water softening Expired GB573711A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1907643A GB573711A (en) 1943-11-16 1943-11-16 Improvements in or relating to water softening

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1907643A GB573711A (en) 1943-11-16 1943-11-16 Improvements in or relating to water softening

Publications (1)

Publication Number Publication Date
GB573711A true GB573711A (en) 1945-12-03

Family

ID=10123370

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1907643A Expired GB573711A (en) 1943-11-16 1943-11-16 Improvements in or relating to water softening

Country Status (1)

Country Link
GB (1) GB573711A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112479396A (en) * 2020-11-24 2021-03-12 中国电力工程顾问集团西北电力设计院有限公司 Deep treatment softening system and process for drainage water

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112479396A (en) * 2020-11-24 2021-03-12 中国电力工程顾问集团西北电力设计院有限公司 Deep treatment softening system and process for drainage water

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