分解工藝

Decomposition process.

先將白鎢礦、黑鎢礦各自磨細(xì)后分別進(jìn)行堿壓煮分解，固液比1:1.1~2.7，壓煮溫度140~200℃，壓力0.3~1.1Mpa，時(shí)間為1~6小時(shí)。白鎢礦堿分解，NaOH的加入量為理論量的2.7~3.7倍，控制初始?jí)A度為500~600g/l，分解完成后稀釋過(guò)濾時(shí)加入理論量2~15%的含P043-添加劑，控制堿度為150~200g/l，溫度為70~80℃，過(guò)濾后的鎢酸鈉溶液不進(jìn)行鎢-堿分離，直接用于黑鎢礦堿分解，控制初始?jí)A度130~200g/l，加入理論量0.8~1.2倍的含PO43-添加劑。

First scheelite, wolframite their ground and were alkali autoclave decomposition, solid-liquid ratio 1:1.1~2.7, pressure cooking temperature 140-200 DEG C, the pressure 0.3~1.1Mpa time for 1 to 6 hours. Decomposition of scheelite alkali, NaOH dosage 2.7~3.7 theory, the amount of times the control initial alkalinity 500~600g/l. After the completion of the decomposition dilution filtration join% of theoretical amount of PO43 - additives, including controlling the alkalinity 150~200g/l, temperature is 70 ~ 80 DEG C, sodium tungstate solution after filtration in tungsten - alkali separation and direct for wolframite alkali decomposition, control the initial alkalinity 130~200g/l adding PO43 - additive containing theoretical amount to 1.2 times.

分解率達(dá)99%左右，可利用冶煉廠現(xiàn)有的通用壓煮設(shè)備同時(shí)處理黑鎢精礦、白鎢精礦、黑白鎢混合礦、鎢中礦和回收廢鎢渣。與酸法工藝比，污染程度大為降低；與其它堿法工藝比，省去鎢-堿分離，減少了能耗及鎢、堿的損耗，綜合堿耗僅為理論量1.35倍左右。

The decomposition rate reached 99%, the smelter existing general purpose pressure cooking equipment and processing wolframite concentrate, white tungsten concentrate, black and white tungsten mixed ore, tungsten middling and recovery waste residue of tungsten. Compared with the acid method, the pollution degree is greatly reduced, and the process is compared with other alkali method, the separation of tungsten and alkali is omitted, the energy consumption and the loss of tungsten and alkali are reduced, and the comprehensive alkali consumption is only about 1.35 times of the theoretical amount.