Research & Development

Study on a new calcification process using Ca(OH)2 as calcification agent in seaweed chemical industry

  • Junkui Miao ,
  • Yueqin Yu
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  • 1. College of Chemistry and Molecular Engineering,Qingdao University of Science and Technology,Qingdao 266042,China
    2. Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences
    3. Marine Biology and Biotechnology Laboratory,Pilot National Laboratory for Marine Science and Technology(Qingdao)

Received date: 2020-03-25

  Online published: 2020-04-13

Abstract

A new calcification process in seaweed chemical industry was studied using Ca(OH)2 as the calcifying agent.A composite of CaCl2 and Ca(OH)2 was used as calcifying agent for sodium alginate instead of traditional CaCl2 .The deter-mined double-calcium calcification process conditions were:per liter of sodium alginate glue(alginate sodium mass concen-tration was 2.5 g/L),the adding amount of 5%(mass fraction) CaCl2 solution was 29.0 mL,the adding amount of 5%(mass fraction) Ca(OH)2 solution was 13.75 mL and the amount-of-substance ratio of CaCl2 to Ca(OH)2 in the composite calcify-ing agent was 1.19:1.Compared with the traditional process,the new calcification process did not change the yield of sodium alginate significantly,but decreased the viscosity of the obtained sodium alginate slightly from 275.1 mPa·s to 241.3 mPa·s.The adding amount of CaCl2 was reduced by more than 40%,and the amount of total calcium ions added was reduced by 19%.The double-calcium calcification process realized the reuse of calcification wastewater,in which the mass concentration of calcium was reduced from 483 mg/L to about 20 mg/L and the electrical conductivity was reduced from 6.84 mS/cm to 4.28 mS/cm after decalcification treatment.The treated calcification wastewater reused as process water did not significantly affect the yield and viscosity of the sodium alginate product.The new process is simple in operation,not only effectively reducing the introduction of ions in the calcification wastewater,but also realizing low-cost decalcification treatment,and the decalcified wastewater would be able to be reused as process water that provides a feasible way to reduce the water consumption in the seaweed chemical industry.

Cite this article

Junkui Miao , Yueqin Yu . Study on a new calcification process using Ca(OH)2 as calcification agent in seaweed chemical industry[J]. Inorganic Chemicals Industry, 2020 , 52(9) : 37 -42 . DOI: 10.11962/1006-4990.2019-0540

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