KR970042268A

KR970042268A - Gypsum using decarbonate sludge produced in seawater magnesia

Info

Publication number: KR970042268A
Application number: KR1019950061774A
Authority: KR
Inventors: 김형석; 이현; 한기현
Original assignee: 김종진; 포항종합제철 주식회사; 신창식; 재단법인 산업과학기술연구소
Priority date: 1995-12-28
Filing date: 1995-12-28
Publication date: 1997-07-24

Abstract

해수 마그네시아 제조시 부산물로 발생되는 폐자원인 탈탄산슬러지를 이용하여 석고를 제조하는 방법이 제공된다. 상기 탈탄산슬러지를 건조후 황산수용액과 직접반응시키면 SiO₂함량이 높은 석고를 얻으며, 탈탄산 슬러지를 체거름하여 탈탄산 슬러지내에 함유된 SiO₂를 1차 제거한 후 황산수용액과 반응시키면 SiO₂함량이 낮은 석고를 얻을 수 있으며, 탈탄산 슬러지를 체거름 한 후, 체거름 통과에 의해 SiO₂가 1차 제거된 탈탄산 슬러지에 불화수소를 첨가하여 pH 5 이하 온도 40℃이상의 조건에서 탈탄산 슬러지내의 잔류하는 SiO₂를 보다 감소시킨 다음 황산수용액과 반응시키면 고순도 석고를 얻을 수 있다.Provided is a method for preparing gypsum using decarbonate sludge, which is a waste resource generated as a by-product of seawater magnesia. Drying the decarbonated sludge and then directly reacting with sulfuric acid solution to obtain a gypsum high SiO ₂ content, sifted decarbonated sludge to remove SiO ₂ contained in the decarbonated sludge first and then reacted with sulfuric acid aqueous solution to SiO ₂ content This low gypsum can be obtained, and after the filtration sludge is sieved, hydrogen fluoride is added to the decarbonated sludge from which SiO ₂ is first removed by filtration and dehydrocarbonate sludge at a temperature of pH 5 or lower and 40 ° C. or higher. Higher purity gypsum can be obtained by further reducing the remaining SiO ₂ in the reaction and then reacting with aqueous sulfuric acid solution.

상기 방법에 의하면, 산업폐기물을 재활용하여 용도 및 필요에 따라 SiO₂함량이 높은 석고로부터 고순도 석고까지 그 제조가 가능하며, 공해방지 측면에서도 유익하다.According to the above method, industrial waste can be recycled to produce gypsum having a high SiO ₂ content to high-purity gypsum, and is also advantageous in terms of pollution prevention.

Description

Gypsum using decarbonate sludge produced in seawater magnesia

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 표준체를 통과한 각 탈탄산슬러지내의 SiO₂함량을 나타낸 그래프1 is a graph showing the SiO ₂ content in each decarbonate sludge passed through a standard body

Claims

A method for producing gypsum, comprising drying the decarburized sludge produced during seawater magnesia to form a dry decarburized sludge, and reacting the precursor decarburized sludge with a sulfuric acid solution.

Sieving decarburized sludge produced during seawater magnesia with a standard 80-200 mesh to remove silicon dioxide contained in decarburized sludge having a large particle size; Recovering and drying the sieve through which the silicon dioxide is first removed to form a dry decarbonate sludge; And reacting the dry decarbonate sludge with an aqueous solution of sulfuric acid in a stoichiometric amount, and then filtering the reaction product. Gypsum manufacturing method having a low SiO2 content comprising a.

Sieving decarburized sludge produced during seawater magnesia with a standard 80-200 mesh to remove silicon dioxide contained in decarburized sludge having a large particle size; The decarbonated sludge passed through the sieved sieve with the silicon dioxide removed first is an aqueous solution, and hydrogen fluoride is added thereto to dissolve the silicon dioxide remaining in the decarbonated sludge under a temperature condition of 40 ° C. or higher. Secondary removal; Recovering and drying the decarbonated sludge from which the silicon dioxide is secondarily removed to form decarbonated sludge; And reacting the dry decarbonate sludge with an aqueous solution of sulfuric acid in a stoichiometric amount, and then filtering the reactant. High purity gypsum manufacturing method comprising a.