Title: Chemical deliming method of natural graphite and coal
Application Number: 89107004 Application Date: 1989.09.02
Publication Number: 1049856 Publication Date: 1991.03.13
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C09C1/46,C10L9/02
Applicant(s) Name: Danlian Univ. of Science and Engineering Address: 116024
Inventor(s) Name: Cui Zhidong, Lin Qi
Attorney & Agent: WANG CHUN
Abstract:
     The present invention belongs to a chemical deliming method of carbon-bearing material, in particular natural graphite and coal. It uses the mixed acid of hydrofluoric acid and fluorosilicic acid as the deliming solution. It is characterized by that firstly the carbon-bearing material is delimed by use of deliming waste liquid for several times, and then is treated by use of newly mixed acid solution, and further the delimed coal is defluorinated, and the hydrofluoric acid in the waste liquid is recovered by use of absorption and desorption method. The present invention raises deliming effect, and the delimed product can be widely used, and its deliming cost is lowered, and its pollution to environment is reduced.
Time: 4
<- Previous Patent:Producing method of iron black   |  Next Patent:Manufacturing method of blue inor... ->