Basic Research On Coal Slurry Advanced Treatment By Chemical And Microbiological Collaborative Method

Coal slurry treatment is a difficult problem in the coal industry. Due to therestriction from management, funds, technology and other factors, there are still coalslurry efflux, low circulating water utilization rate and the waste in coal energy. Withthe increase of pressure on the world environmental protection and the improvementof energy conservation requirement, it is needed to change the current utilizationstatus of coal slurry treatment, and choose high effective methods.Coal slurry from Xuzhou Jiahe mine, Zhangshuanglou mine and YongchengXuehu mine as the research object, with the help of advanced analytical instrumentsof laser particle size analyzer, XRD, atomic absorption spectrometer, UVspectrophotometer, ion chromatography, basic properties of coal slurry system weremeasured.The influence factors, rules and related parameters of coal slurry treatmentwere studied by mathematical modeling, regression analysis, linear fitting,Design-Expert design and other advanced theoretical analysis,test method. Throughthe combination of microbial co processing of coal slurry, the removal mechanism ofpyrite in coal slurry was researched. The series of results:The new idea of coal slurry treatment by chemical and microbial method waspresented. With the selective adsorption to pyrite, pyrite was released from the coalslime by Thiobacillus ferrooxidans(T.f), and the high desulfurization rate79.3%wasobtained during relatively ideal time7days. The removal mechanism of pyrite wasget through the chemical reaction and biochemical reaction equations. Under theinteraction of microorganisms and chemistry, the micro chemical mechanism, reactionconditions, and influencing factors of pyrite were explained, as well as selectivecontrol and coupling process of the target product.Chemical and microbiological method collaborative processing model test deviceto manage and clean coal slurry was designed deeply in the experimental research ofthis thesis. Microorganism, degradable modified polyacrylamide polymer flocculant(st-PAM) and calcium chloride were used by collaboration to make full use of highperformance polymer agent in coal slurry treatment, but also avoid subsequentpollution from conventional chemical ways by single use in the management of coalslurry, the implementation of environmental protection of coal slurry treatment wasfinished in the process.Research on coal slurry by single factor and composite experimental design was optimized. The effect of st-PAM on the settlement of coal slurry had a certainflocculation effect, and the sedimentation velocity was ideal relatively.Use calcium chloride alone has little effect on coal slurry sedimentation velocity,but a significant increase on transmittance, and both significant enhance by using withst-PAM in the sedimentation velocity and transmittance.In the White rot fungi(W.r.f) single case, coal slurry sedimentation velocity andlight transmission rate had no obvious effect in a short time, while the increase ofsedimentation velocity, the enhancing of stability in fast sedimentation and the idealprocessing effect of dosage were reflected respectively by collaborative usingst-PAM, calcium chloride and W.r.f.The permeability of filter cake and the constant pressure filtration coefficient Kwith calcium chloride and polymeric flocculant was improved through the study onthe technical parameters and the basic data results of coal slime dewatering. Thefiltration speed was further increased by adding microbial flocculant, but after addingmicrobial flocculant filter cake moisture content increased slightly.With the help of Design-Expert software, the two predictive model equationaccording to the least square method, and orthogonal experimental design of multiplefactors and levels, orthogonal test factors were optimized of coal slurry treatment wascarried. The model equations under the condition of transmittance, sedimentationvelocity, pH value, filter press dewatering time, compression height/total height wereobtained through multiple regression, and accuracy and significant test. Factoroptimization experiment scheme of Jiahe coal slurry supernatant transmittance90.48%and the supernatant pH3D surface response rule were given. ForZhangshuanglou and Xuehu coal slurry, the interaction rules and influence of relatedevaluation index response value were provided.