本文關鍵詞： 褐煤洗選 預先泥化 分選工藝 泥化特征 高泥化煤泥水處理　出處：《中國礦業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：褐煤因其低變質、易風化、易泥化的特性,被選煤界普遍認為不適合入水洗選,從而使褐煤的利用價值受到了限制。本論文以勝利褐煤為研究對象,分析了褐煤煤質,評價了其可選性,揭示了勝利褐煤的泥化特征,提出了適合勝利褐煤洗選的預先泥化分選工藝。論文針對褐煤泥化后產生的煤泥水,分析了其難沉降的原因,研究了煤泥水沉降性能及煤泥壓濾性能。論文主要的研究如下:1、分析勝利褐煤煤質,評價其可選性。勝利褐煤具有高水、高灰、高硫、低熱值的特點,直接利用價值低,原煤粒度分布不均勻且矸石易碎。浮沉試驗表明:原煤內灰高,難以分選出低灰精煤;浮煤產率高、中煤產率低,說明可選性好且精煤理論產率高。2、勝利褐煤中矸石和不同粒級原煤的泥化特征研究。矸石與煤的泥化程度差別較大:矸石泥化屬于高泥化程度,容易成“泥”;煤即使碎成細粒也是以顆粒狀存在,不會成“泥”。不同粒級褐煤泥化程度不同,末煤的泥化程度高于塊煤;-3 mm粒級可選性差且極易泥化,不宜水洗。3、基于褐煤泥化特征提出預先泥化洗選工藝,并通過分選試驗驗證了工藝可行性。論文提出“+3 mm預先泥化脫泥跳汰分選、-3mm粒級干法分選或不分選”工藝流程。試驗表明:褐煤泥化后經(jīng)跳汰洗選時,矸石泥化現(xiàn)象明顯降低,分選指標好且煤泥水濃度低。4、論文分析了勝利褐煤泥化后煤泥水難沉降原因,研究了煤泥水沉降性能及煤泥壓濾性能。煤泥粒度細且粘土礦物含量高,因布朗運動和靜電斥力而呈現(xiàn)出的沉降穩(wěn)定性和聚合穩(wěn)定性導致煤泥水自然沉降性能差。水質硬度增大可優(yōu)化沉降效果,煤泥水濃度為29.9 g/L和34.4 g/L時,FOCUSⅡ藥劑優(yōu)化后用量分別為377 g/t和468 g/t。煤泥壓濾較困難,將煤泥水濃縮至濃度為374.3 g/L,當壓濾時間為40 min、過濾壓力為0.8 Mpa時濾餅水分25.86%,可以滿足選煤廠實際生產的需要。
[Abstract]:Because of its low metamorphism, easy weathering and easy to muddy, lignite is generally considered unsuitable for washing with water, which limits the utilization value of lignite. In this paper, Shengli lignite is taken as the research object and the quality of lignite is analyzed. This paper evaluates its separability, reveals the mudding characteristics of Shengli lignite, and puts forward a pre-mudding separation process suitable for Shengli lignite washing. The paper analyzes the causes of its difficult settlement in view of the slime water produced by lignite sludge. This paper studies the settling performance of slime water and the pressure filtration performance of coal slime. The main research in this paper is as follows: 1, analyzing the coal quality of Shengli lignite and evaluating its selectability. Shengli lignite has the characteristics of high water, high ash, high sulfur, low calorific value and low value of direct utilization. The floatation test shows that the inner ash of raw coal is high, it is difficult to separate out low ash concentrate coal, the yield of floating coal is high, and the yield of middle coal is low. The results show that there is good selectivity and the theoretical yield of clean coal is high, and the mudding characteristics of gangue and different grained raw coal in Shengli lignite are studied. The mudding degree of gangue and coal is quite different: the mudding of gangue belongs to high mudding degree. It is easy to form "mud"; even if the coal is broken into fine particles, it still exists in the form of granules and does not form "mud." different grain-grade lignite has different degree of mudding, and the mudding degree of the final coal is higher than that of the bulk coal of 3 ~ 3 mm, and it is easy to muddy. It is not suitable to wash. 3. Based on the mudding characteristics of lignite, the pre-mud washing process is put forward. The feasibility of the process was verified by the separation test. The technological process of "3mm pre-mud desliming jig sorting or non-separation" was put forward in this paper. The test results show that: when lignite is mudded and washed by jig, The phenomenon of gangue mudding is obviously reduced, the separation index is good and the concentration of slime water is low. 4. The paper analyzes the reasons for the difficult settling of slime water after lignite mudding in Shengli, and studies the settling performance of slime water and the pressure filtration performance of slime. The slime size is fine and the clay mineral content is high. Due to Brownian motion and electrostatic repulsive force, the stability of sedimentation and polymerization results in poor natural subsidence performance of coal slime water, and the settlement effect can be optimized by increasing the hardness of water quality. When the slurry concentration is 29.9 g / L and 34.4 g / L, the optimized dosage of FOCUS 鈪，

本文編號：1511911