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造紙黑液木質素提取及碳酸根離子轉化成碳酸鈣處理方法研究

時間:2019-05-17 20:32來源:畢業論文
以制漿造紙黑液為原料,對黑液廢水處理增設了木質素提取及碳酸根離子轉化成碳酸鈣的過程,并對其進行了實驗與研究,實現廢物資源再利用的循環經濟。采用酸析法制備木質素,通

摘要:制漿造紙是我國重要的一種國民經濟產業,而黑液是造紙廠所排放的主要污染物。目前國內外的廢液治理技術在木漿紙廠應用的都已經有相對較成熟。然而,對于原料為草類的廠家,由于產生的黑液熱值低、硅和灰份含量較高,堿回收運行起來比較困難,大大增加了治理難度。35438
本論文以制漿造紙黑液為原料,對黑液廢水處理增設了木質素提取及碳酸根離子轉化成碳酸鈣的過程,并對其進行了實驗與研究,實現廢物資源再利用的循環經濟。采用酸析法制備木質素,通過酸化,過濾,洗滌,烘干等方法提取木質素。通過不斷嘗試尋找出木質素沉淀效果最佳的酸性條件。當pH值=3的時候,木質素沉淀可達90%。另外根據國家標準要求,工業廢水的排放pH需要大于7。用廉價的CaO將酸性的木質素濾液調至堿性,再通入富含CO2的煙道氣結晶出CaCO3。最后應用吸附沉降等物理方法處理廢水,以達到國家要求的排放標準。
畢業論文關鍵詞:造紙黒液;木質素;酸性;碳酸鈣;排放
The study of black liquid of papermaking treatment
Abstract: Pulping papermaking is an important industry of national economy in China, however, black liquor is the main pollutant emitted by paper mill. At present , the liquid-waste treatment technology applications have been relatively mature in the pulp mill at home and abroad. But due to the low calorific value of black liquor, high silicon and ash content and difficult operation of alkali recovery, greatly increased the difficulty of governance on manufacturers which with grass as material. 源`自*六)維[論*文'網www.aftnzs.live
    We took the pulping black liquor of papermaking as raw material, It achieved circular economy of reusing waste resources and was experimented and researched, for addition of the process of lignin extraction and carbonate ions converted into calcium carbonate in black liquor liquid-waste treatment. The preparation of lignin was used acid precipitation. Extracted lignin by acidification, filtration, washing, drying and other methods. By constantly trying to find the best acid conditions of the lignin precipitation effect. Lignin precipitation can reach 90% when PH=3. According to the national standard, the pH of discharging industrial wastewater need to be more than 7. The lignin filtrate was modulated from acidic to alkaline by the cheap CaO, and then added CO2 to crystallized CaCO3. Finally, the treatment of liquid-waste by physical methods such as adsorption sedimentation.
Key words: the black liquor of papermaking; lignin; acidic; calcium; carbonate discharge
目  錄
1 緒論    1
1.1 開題依據    1
1.2 造紙黒液    1
1.2.1 造紙黒液性狀    1
1.2.2 造紙黑液的危害    1
1.2.3 造紙黑液處理現狀    2
1.3木質素的提取方法    2
1.3.1 堿析法    3
1.3.2 酸析法    4
1.3.3 絮凝沉淀法    4
1.3.4 超濾法    4
1.4碳酸鈣的提取方法    4
1.4.1 Ca(OH)2—H2O—CO2反應系統    5
1.4.2 Ca2+—R—CO32-反應系統    6
1.4.3 3Ca2+-H2O-CO32-反應系統    6
1.5 廢水處理    7

源`自*六)維[論*文'網www.aftnzs.live


1.5.1 廢水排放標準    7
1.5.2 廢水指標    8
1.5.3 廢水處理方法    9
1.6課題的來源、研究意義及內容    10
1.6.1 課題的來源    10
1.6.2 課題的研究意義    10
1.6.3 課題的研究內容    11
2  實驗部分    12
2.1 實驗原料與儀器設備    12
2.1.1 實驗原料    12 造紙黑液木質素提取及碳酸根離子轉化成碳酸鈣處理方法研究:http://www.aftnzs.live/huaxue/20190517/33386.html
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