大武口洗煤厂金能分厂TBS溢流分级脱泥工艺优化实践

为适应入洗矿井煤的煤质变化,通过分析大武口洗煤厂金能分厂TBS溢流分级脱泥效果,对其原有工艺系统进行技术改造以解决TBS尾煤中精煤损失增加的问题。经生产实践证明,通过增设水力分级旋流器等技术改造,可优化洗煤厂TBS溢流分级脱泥工艺流程,提高精煤产率及改善精煤产品的脱水效果。

弧形筛二次造浆脱泥效果分析

随着市场对煤炭的要求越来越高,靠单一煤种难以保证选煤厂的利润,保德选煤厂根据自身煤炭禀赋,结合工艺现状,优化工艺系统,生产利润价值更高的炼焦配煤。保德选煤厂螺旋分选机入料中含有25%左右的焦煤具有回收价值,因此,炼焦配煤产品主要为末精煤和螺旋精煤。螺旋分选机分选的精煤灰分约21%~23%,通过弧形筛脱水脱泥后,螺旋精煤灰分降至约18%,弧形筛脱水脱泥效率较低导致螺旋精煤中含有大量高灰细泥,影响产品灰分。末精煤灰分约8%,为了保证螺旋精煤与末精煤掺配产品灰分加权值低于10%,在弧形筛筛面上布置2道喷水,对脱水后的筛上物进行二次造浆脱泥,强化脱水脱泥效果,从而进一步降低螺旋精煤灰分,稳定产品质量指标。

实施工艺技术改造 解决煤泥水处理问题

该本介绍了选煤厂煤泥水处理中存在的问题,并通过对煤泥水处理系统实施工艺技术改造,完善精煤脱水环节,解决了系统中存在的问题,提高了精煤回收率,实现了清水洗煤和洗水平衡,实现了洗水闭路循环,取得了良好的经济效益和社会效益。

Influence of Filter Cloth on the Cathode on the Electroosmotic Dewatering of Activated Sludge

The mechanical dewatering of activated sludge is troublesome due to its high compressibility of solids. The dewatering can be enhanced dramatically by the use of electroosmosis,in which an electric field is applied to the sludge cake.In this study,the influence of filter cloth on the cathode on the dewatering of activated sludge was investigated.It was found that thicker filter cloth led to lower water removal from the sludge cake,so a stainless steel cathode net with small pore size instead of filter cloth was applied,which improves the dewatering efficiency and reduces the electric power consumption.Moreover,water absorbent materials were helpful to remove the water from the sludge cake.For the electroosmotic dewatering at 7 kPa and 24 V·cm-1,the water content in the sludge cake decreased to 60%(by mass) with the average 0.075 kW·h·kg-1of water removed by using the cathode net.

Application of Chitosan Flocculant to Conditioning Sludge

The dewaterability of activated sludge conditioned by chitosan flocculant was studied. The effects of chitosan characteristics such as molecular weight, degree of deacetylation, and dose on the dewaterability were investigated. The sludge dewaterability is evaluated in terms of specific resistance to filtration, residual turbidity of supernatant, moisture content of cake, and settling rate. Sludge dehydrating behaviors conditioned with CTS, PAM and PAC flocculants were compared. The conditioning was also carried out with dual flocculants in two stages. It is found that the sludge conditioned with CTS has better dewaterability than that with PAC. The optimum conditions with chitosan are: dose 0.8 - 1.2 g per 100 g dry cake, molecular weight 300,000, and degree of deacetylation 70%. The conditioning in two stages with dual flocculants is found to be more effective than that with single flocculant.

微电子技术在凤矿应用的探讨

本文介绍凤凰山铜矿若将微电子技术应用于铁精砂的脱泥脱水系统中,预计可取得的经济效益。