1. List the chemical composition of the gold mud.
2. Determine the slag silicic acidity (K = 1 ~ 2) and the type of oxidant used. The total amount of oxidizing flux required is calculated according to the element flux coefficients of the elements in the table below and the content of the elements in the gold mud.
Melt dose calculation table | ||||||
Substance name | Content% | Oxygen coefficient | Oxygen demand (kg) | Flux coefficient | Melting dose | |
Acidic | Alkaline | NaNO 3 | (kg) NaNO 3 | |||
Cu | 1.52 | 0.127 | 　 | 0.193 | 0.46 | 0.699 |
Pb | 5.72 | 0.077 | 　 | 0.44 | 0.28 | 1.602 |
Zn | 17.3 | 0.246 | 　 | 4.256 | 0.87 | 15.051 |
Fe | 0.11 | 0.285 | 　 | 0.031 | 1.01 | 0.111 |
S | 4.5 | 　 | 　 | 　 | 5.3 | 23.85 |
SiO 2 | 0.3 | 0.534 | 0.16 | 　 | 　 | 　 |
CaO | 3.22 | 0.285 | 　 | 0.918 | 　 | 　 |
NaNO 3 | 41.31 | 0.094 | 　 | 3.883 | 　 | 　 |
Na 2 B 4 O 7 | 0.6 | 0.477 | 0.286 | 0.047 | 　 | 　 |
0.079 | ||||||
Combined  meter | 100 | 　 | 0.446 | 9.768 | 　 | 41.313 |
3. The charge amount of acidic and basic oxygen was determined by the oxygen content of each element and the oxygen transfer coefficient gold mud, of silicic acid by the flux ingredients and requirements (i.e., the proportion of quartz sand and boron), a variety of solvents to obtain the desired quantity. [next]
4. List the composition of the final charge and calculate the percentage of each component.
The following is a theoretical calculation of the charge preparation by taking a 100,000-gram gold mud from a mine.
Chemical composition of 100 kg of gold mud Composition Cu Fe Pb Zn CaO SiO 2 S Au Ag
Content% 1.51 0.11 5.72 17.3 3.32 0.30 4.50 47.39 4.43
The slag has a silicon acidity K of 1.5, and a saltpeter is selected as the oxidant. According to the oxygen coefficient and the flux coefficient of each element multiplied by the content of each element in the gold mud, the total amount of oxidant nitrates required to oxidize 100 kilograms of gold mud and the amount of acid oxygen and inert oxygen in the charge are determined, and the calculation results are included. In the table. It can be seen from the above table that the acid oxygen in the charge is 0.446 kg and the inert oxygen is 9.736 kg. To ensure the slag of K = 1.5, it is necessary to provide 9.728 × 1.5 - 0.446 = 14.21 kg of acidic oxygen. Acidic oxygen is only provided by quartz and borax. Since the zinc content in the gold mud is 17.3%>15%, quartz is required in the batching: borax = 1:2. Known by the oxygen coefficient
　 | Oxygen acid | Alkaline oxygen |
1 kilogram of quartz | 0.534 | 　 |
2 kg borax | 0.954 | 0.158 |
Combined   meter | 1.488 | 0.158 |
Therefore, a mixture of quartz and borax (according to 1:2) is used to satisfy the acid oxygen required for its own 0.158 kg of inert oxygen (according to K=
Acidic oxygen - - = 1.5), can also provide acidic oxygen: 1.488-1.5 × 0.158 = 1.251 (kg). Therefore, to provide oxygen in order to meet the needs of 14.21
14.21 kg of acidic oxygen requirements, 100 kg of dry gold mud still need to be matched - 11.13 parts of quartz and borax (ratio 1:2) mixed 1.251
The material is matched with 11.36 kg of quartz and 22.72 kg of borax. Since the original gold mud still contains 0.3% quartz, the borax needs to be added with 0.6 kg. The final charge is calculated as follows: 100 kg of dry gold mud; 23.32 kg of borax; 11.38 kg of quartz; 41.31 kg of nitrate.
Theoretical calculations are a relatively reliable method. However, due to the volatilization of Dali zinc and lead in smelting, the theoretically calculated slag melting amount is generally excessive.
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