Use of salt-pond slightly soluble crystal substance as cement retarder

Abstract

The invention discloses the use of a salt-pond slightly soluble crystal substance as a cement retarder. In use, saline-alkali flakes are transported to the raw material workshop of the company of the invention from a saltern for primary water washing; after being dried, the saline-alkali flakes are stacked in a stock ground and air-cured, and then transported to a special measuring pocket by a forklift; full-automatic production blending is performed by use of various metering scales according to a designed ratio, and various raw materials are ground in a mill together; the ground cement is stored in a cement bunker for sell; if being tested to be qualified, the finished cement is organized and packaged according to the requirements of users or delivered in bulk. The use dosage of the saline-alkali flakes as the cement retardant is 6%. As SO3 in the saline-alkali flakes is relatively high and stable, the doped cement is good in quality. The saline-alkali flakes are easy to crush and use. The saline-alkali flakes belong to reproducible waste resources in the salt manufacturing industry, and are relatively low in cost, and the cement industry requires a large quantity of materials and is relatively high in energy consumption; as a result, the saline-alkali flakes are utilized thoroughly to well meet the requirements of green economic development. Meanwhile, measures are adjusted to local conditions and the waste materials are recycled.

Description

technical field [0001] The invention relates to the technical field of reuse of seawater salt production products, in particular to the use of a slightly soluble crystal in a salt pond as a cement retarder. Background technique [0002] Slightly soluble crystals in salt ponds, also known as saline-alkali flakes, are produced along with seawater salt production. Seawater with a Baume degree of 2°Bé is introduced into the salt pond to be exposed to wind and sun, and when it reaches 17°Bé, slightly soluble crystalline minerals begin to be produced at the bottom of the salt pond (locally called saline-alkali tablets), when it reaches 25°Bé or more, it begins to form salt, and the salt is above the saline-alkali tablets. Since it does not affect the salt collection, it has not attracted everyone's attention. [0003] There was a lack of research on the slightly soluble crystalline mineral salts at the bottom of the salt pond. They believed that the slightly soluble crystals at th...

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Problems solved by technology

[0009] The main component of saline-alkali tablets is CaSO 4 2H 2 O, the saline-alkali tablets just collected from the salt pond contain a certain amount of NaCl, KCl, MgCl 2 , CaCl 2 Chlorides and other chlorides, directly mixed, will cause the cement to contain more Cl-, which does not meet the national regulations. It needs to be washed with water first, and a large amount of chlorides will be dissolved and washed away, and then used as a retarder for cement production. ok

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